# Boeing Alert Service Bulletin 737-53A1261: Revision 1

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2015-3984; AD 2017-04-08 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Service Bulletin 737-53A1261](https://openairdocs.org/service-documents/boeing/737-53a1261.md)
- Title as filed: SB-737-53A1261-01
- Pages: 622
- PDF: https://openairdocs.org/files/sha256/cc/92/cc923bee238cc7a62e900aaa338361e2541460bdc58427dd501b0f014406e097
- Page: https://openairdocs.org/service-documents/boeing/737-53a1261/file/cc923bee238c

## Text

Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

Commercial 
Airplanes
737
Service Bulletin
ALERT
Number: 737-53A1261
Original Issue: January 19, 2006
Revision 1: January 30, 2015
ATA System: 5311
SUBJECT: FUSELAGE - Frames and Bulkheads - Upper Frame To Side Frame Splice - Inspection,
Repair and Modification
Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15
CFR 300-774). An export license may be required before it is used for development, production or use by foreign
persons from specific countries. The controller of this data has the individual responsibility to abide by all export
laws.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET
Copyright © 2006 Boeing.
Unpublished Work. All Rights Reserved.
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document
are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The
Boeing Company.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner,
BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and
Boeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in
connection with this document unless provided in writing by Boeing.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
1 of 622
3.0

### Page 2

Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
2 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT
BLANK PAGE

### Page 3

Table of Contents
Revision Transmittal Sheet ........................................... 1 1
Summary ..................................................... 1 5
1. PLANNING INFORMATION ........................................ 2 1
A. Effectivity ............................................... 2 1
1. Airplanes ............................................ 2 1
2. Spares Affected ........................................ 4 6
B. Concurrent Requirements ...................................... 4 6
C. Reason ................................................ 4 6
D. Description .............................................. 4 7
E. Compliance .............................................. 5 0
F. Approval ............................................... 7 1
G. Manpower .............................................. 7 2
H. Weight and Balance Changes .................................... 7 4
I. Electrical Load Data ......................................... 7 6
J. References .............................................. 7 6
1. Existing Data: ......................................... 7 6
2. Data Supplied with this Service Bulletin: ........................... 7 7
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 7 7
K. Publications Affected ........................................ 7 8
L. Interchangeability and Intermixability of Parts ........................... 7 8
M. Software Accomplishment Summary ................................ 7 8
2. MATERIAL INFORMATION ........................................ 7 9
A. Material - Price and Availability ................................... 7 9
B. Industry Support Information .................................... 7 9
C. Parts Necessary for Each Airplane ................................. 7 9
1. Kits/Parts: ........................................... 7 9
2. Parts and Materials Supplied by the Operator: ........................ 7 9
3. Parts Modified and Reidentified: ............................... 8 3
4. Parts Removed and Not Replaced: .............................. 8 3
D. Parts Necessary to Change Spares ................................. 8 3
E. Special Tooling - Price and Availability ............................... 8 3
F. Special Tooling Necessary to do this Service Bulletin ....................... 8 3
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 8 5
A. GENERAL INFORMATION ..................................... 8 5
B. WORK INSTRUCTIONS ....................................... 8 6
FIGURE 1: LEFT SIDE - FRAME SPLICE LOCATIONS [Group 1-2] .................. 1 4 0
FIGURE 2: RIGHT SIDE - FRAME SPLICE LOCATIONS [Group 1-2] ................. 1 4 1
FIGURE 3: LEFT SIDE - FRAME SPLICE LOCATIONS [Group 3-6] .................. 1 4 2
FIGURE 4: RIGHT SIDE - FRAME SPLICE LOCATIONS [Group 3-6] ................. 1 4 3
FIGURE 5: LEFT SIDE - FRAME SPLICE LOCATIONS [Group 7-8] .................. 1 4 4
FIGURE 6: RIGHT SIDE - FRAME SPLICE LOCATIONS [Group 7-8] ................. 1 4 5
FIGURE 7: LEFT SIDE - FRAME SPLICE LOCATIONS [Group 9] ................... 1 4 6
FIGURE 8: RIGHT SIDE - FRAME SPLICE LOCATIONS [Group 9] .................. 1 4 7
FIGURE 9: LEFT SIDE - FRAME SPLICE LOCATIONS [Group 10] .................. 1 4 8
FIGURE 10: RIGHT SIDE - FRAME SPLICE LOCATIONS [Group 10] ................. 1 4 9
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
3 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 4

FIGURE 11: LEFT SIDE - FRAME SPLICE LOCATIONS [Group 11] .................. 1 5 0
FIGURE 12: RIGHT SIDE - FRAME SPLICE LOCATIONS [Group 11] ................. 1 5 1
FIGURE 13: UPPER FRAME TO SIDE FRAME SPLICE, LEFT SIDE - INSPECTION [Group 1, Configuration
1, 4; Group 2, Configuration 1, 4; Group 3, Configuration 1, 4; Group 4, Configuration 1, 4; Group
5, Configuration 1, 4; Group 6, Configuration 1, 4; Group 7, Configuration 1, 4; Group 8,
Configuration 1, 4; Group 9, Configuration 1, 4; Group 10, Configuration 1, 4; Group 11,
Configuration 1, 4] ....................................... 1 5 2
FIGURE 14: UPPER FRAME TO SIDE FRAME SPLICE, LEFT SIDE - INSPECTION [Group 1, Configuration
3, 5; Group 2, Configuration 3, 5; Group 3, Configuration 3, 5; Group 4, Configuration 3, 6; Group
5, Configuration 3, 6; Group 6, Configuration 3, 6; Group 7, Configuration 3, 5; Group 8,
Configuration 3, 6; Group 9, Configuration 3, 6; Group 10, Configuration 3, 6; Group 11,
Configuration 3, 6] ....................................... 1 5 4
FIGURE 15: UPPER FRAME TO SIDE FRAME SPLICE, RIGHT SIDE - INSPECTION [Group 1, Configuration
1, 4; Group 2, Configuration 1, 4; Group 3, Configuration 1, 4; Group 4, Configuration 1, 4; Group
5, Configuration 1, 4; Group 6, Configuration 1, 4; Group 7, Configuration 1, 4; Group 8,
Configuration 1, 4; Group 9, Configuration 1, 4; Group 10, Configuration 1, 4; Group 11,
Configuration 1, 4] ....................................... 1 5 6
FIGURE 16: UPPER FRAME TO SIDE FRAME SPLICE, RIGHT SIDE - INSPECTION [Group 1, Configuration
3, 5; Group 2, Configuration 3, 5; Group 3, Configuration 3, 5; Group 4, Configuration 3, 6; Group
5, Configuration 3, 6; Group 6, Configuration 3, 6; Group 7, Configuration 3, 5; Group 8,
Configuration 3, 6; Group 9, Configuration 3, 6; Group 10, Configuration 3, 6; Group 11,
Configuration 3, 6] ....................................... 1 5 8
FIGURE 17: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD TRIM, LEFT SIDE [Group 4,
Configuration 3, 6; Group 5, Configuration 3, 6; Group 6, Configuration 3, 6; Group 8,
Configuration 3, 6; Group 9, Configuration 3, 6; Group 10, Configuration 3, 6; Group 11,
Configuration 3, 6] ....................................... 1 6 0
FIGURE 18: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD TRIM, RIGHT SIDE [Group
4, Configuration 3, 6; Group 5, Configuration 3, 6; Group 6, Configuration 3, 6; Group 8,
Configuration 3, 6; Group 9, Configuration 3, 6; Group 10, Configuration 3, 6; Group 11,
Configuration 3, 6] ....................................... 1 6 3
FIGURE 19: RADIUS FILLER - FABRICATION .............................. 1 6 6
FIGURE 20: UPPER FRAME TO SIDE FRAME SPLICE, SECTION OF UPPER FRAME, LEFT SIDE SHEAR
TIE FRAMES - REMOVAL .................................. 1 6 7
FIGURE 21: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT FRAME SECTION AND REPAIR
ANGLES, LEFT SIDE SHEAR TIE FRAMES - FABRICATION ............... 1 7 2
FIGURE 22: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, LEFT SIDE SHEAR TIE FRAMES -
INSTALLATION ........................................ 1 7 6
FIGURE 23: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, LEFT SIDE SHEAR TIE FRAMES -
FASTENERS (RIVETS) INSTALLATION .......................... 1 8 0
FIGURE 24: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, LEFT SIDE SHEAR TIE FRAMES -
FASTENERS (HI-LOKS) INSTALLATION .......................... 1 8 5
FIGURE 25: UPPER FRAME TO SIDE FRAME SPLICE, SECTION OF UPPER FRAME, RIGHT SIDE SHEAR
TIE FRAMES - REMOVAL .................................. 1 9 0
FIGURE 26: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT FRAME SECTION AND REPAIR
ANGLES, RIGHT SIDE SHEAR TIE FRAMES - FABRICATION .............. 1 9 5
FIGURE 27: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, RIGHT SIDE SHEAR TIE FRAMES -
INSTALLATION ........................................ 1 9 9
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
4 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 5

FIGURE 28: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, RIGHT SIDE SHEAR TIE FRAMES -
FASTENERS (RIVETS) INSTALLATION .......................... 2 0 3
FIGURE 29: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, RIGHT SIDE SHEAR TIE FRAMES -
FASTENERS (HI-LOKS) INSTALLATION .......................... 2 0 8
FIGURE 30: UPPER FRAME TO SIDE FRAME SPLICE, SECTION OF UPPER FRAME, LEFT SIDE NON
SHEAR TIE FRAMES - REMOVAL ............................. 2 1 3
FIGURE 31: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT FRAME SECTION AND REPAIR
ANGLES, LEFT SIDE NON SHEAR TIE FRAMES - FABRICATION ........... 2 1 8
FIGURE 32: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, LEFT SIDE NON SHEAR TIE FRAMES
- INSTALLATION ....................................... 2 2 2
FIGURE 33: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, LEFT SIDE NON SHEAR TIE FRAMES
- FASTENERS (RIVETS) INSTALLATION .......................... 2 2 6
FIGURE 34: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, LEFT SIDE NON SHEAR TIE FRAMES
- FASTENERS (HI-LOKS) INSTALLATION ......................... 2 3 0
FIGURE 35: UPPER FRAME TO SIDE FRAME SPLICE, SECTION OF UPPER FRAME, RIGHT SIDE NON
SHEAR TIE FRAMES - REMOVAL ............................. 2 3 5
FIGURE 36: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT FRAME SECTION AND REPAIR
ANGLES, RIGHT SIDE NON SHEAR TIE FRAMES - FABRICATION ........... 2 4 0
FIGURE 37: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, RIGHT SIDE NON SHEAR TIE FRAMES
- INSTALLATION ....................................... 2 4 4
FIGURE 38: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, RIGHT SIDE NON SHEAR TIE FRAMES
- FASTENERS (RIVETS) INSTALLATION .......................... 2 4 8
FIGURE 39: UPPER FRAME TO SIDE FRAME SPLICE, REPLACEMENT SECTION OF UPPER FRAME,
INNER REPAIR ANGLE AND OUTER REPAIR ANGLE, RIGHT SIDE NON SHEAR TIE FRAMES
- FASTENERS (HI-LOKS) INSTALLATION ......................... 2 5 2
FIGURE 40: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD FASTENERS, LEFT SIDE
SHEAR TIE FRAMES - INSPECTION ........................... 2 5 7
FIGURE 41: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD FASTENERS, LEFT SIDE
SHEAR TIE FRAMES - INSPECTION ........................... 2 5 9
FIGURE 42: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD FASTENERS, RIGHT SIDE
SHEAR TIE FRAMES - INSPECTION ........................... 2 6 1
FIGURE 43: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD FASTENERS, RIGHT SIDE
SHEAR TIE FRAMES - INSPECTION ............................ 2 6 3
FIGURE 44: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE SHEAR TIE
FRAMES - FABRICATION .................................. 2 6 5
FIGURE 45: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE SHEAR TIE
FRAMES - FASTENERS (RIVETS) INSTALLATION .................... 2 6 8
FIGURE 46: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE SHEAR TIE
FRAMES - FASTENERS (HI-LOKS) INSTALLATION ................... 2 7 2
FIGURE 47: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE SHEAR
TIE FRAMES - FABRICATION ................................ 2 7 7
FIGURE 48: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE SHEAR
TIE FRAMES - FASTENERS (RIVETS) INSTALLATION .................. 2 8 0
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
5 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 6

FIGURE 49: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE SHEAR
TIE FRAMES - FASTENERS (HI-LOKS) INSTALLATION ................. 2 8 4
FIGURE 50: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD FASTENERS, LEFT SIDE
NON SHEAR TIE FRAMES - INSPECTION ......................... 2 8 9
FIGURE 51: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD FASTENERS, LEFT SIDE
NON SHEAR TIE FRAMES - INSPECTION ......................... 2 9 1
FIGURE 52: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD FASTENERS, RIGHT SIDE
NON SHEAR TIE FRAMES - INSPECTION ......................... 2 9 3
FIGURE 53: UPPER FRAME TO SIDE FRAME SPLICE, FAIL SAFE CHORD FASTENERS, RIGHT SIDE
NON SHEAR TIE FRAMES - INSPECTION ......................... 2 9 5
FIGURE 54: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE NON SHEAR
TIE FRAMES - FABRICATION ................................ 2 9 7
FIGURE 55: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE NON SHEAR
TIE FRAMES - FASTENERS (RIVETS) INSTALLATION .................. 2 9 9
FIGURE 56: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE NON SHEAR
TIE FRAMES - FASTENERS (HI-LOKS) INSTALLATION ................. 3 0 4
FIGURE 57: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE NON SHEAR
TIE FRAMES - FABRICATION ................................ 3 0 9
FIGURE 58: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE NON SHEAR
TIE FRAMES - FASTENERS (RIVETS) INSTALLATION .................. 3 1 1
FIGURE 59: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE NON SHEAR
TIE FRAMES - FASTENERS (HI-LOKS) INSTALLATION ................. 3 1 6
FIGURE 60: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE SHEAR TIE
FRAMES - FASTENERS (HI-LOKS) INSTALLATION ................... 3 2 1
FIGURE 61: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE SHEAR
TIE FRAMES - FASTENERS (HI-LOKS) INSTALLATION ................. 3 2 6
FIGURE 62: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE NON SHEAR
TIE FRAMES - FASTENERS (HI-LOKS) INSTALLATION ................. 3 3 1
FIGURE 63: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE NON SHEAR
TIE FRAMES - FASTENERS (HI-LOKS) INSTALLATION ................. 3 3 6
FIGURE 64: UPPER FRAME TO SIDE FRAME SPLICE AT SB 737-53-1125 FRAME REPAIR, LEFT SIDE
SHEAR TIE FRAMES - POST-REPAIR INSPECTION ................... 3 4 1
FIGURE 65: UPPER FRAME TO SIDE FRAME SPLICE AT SB 737-53-1125 FRAME REPAIR, RIGHT SIDE
SHEAR TIE FRAMES - POST-REPAIR INSPECTION ................... 3 4 3
FIGURE 66: UPPER FRAME TO SIDE FRAME SPLICE AT SB 737-53-1125 FRAME REPAIR, LEFT SIDE
NON SHEAR TIE FRAMES - POST-REPAIR INSPECTION ................ 3 4 5
FIGURE 67: UPPER FRAME TO SIDE FRAME SPLICE AT SB 737-53-1125 FRAME REPAIR, RIGHT SIDE
NON SHEAR TIE FRAMES - POST-REPAIR INSPECTION ................ 3 4 7
FIGURE 68: UPPER FRAME TO SIDE FRAME SPLICE, LEFT SIDE, STATION 360 - INSPECTION . 349
FIGURE 69: UPPER FRAME TO SIDE FRAME SPLICE, LEFT SIDE, STATION 360 - INSPECTION . 352
FIGURE 70: UPPER FRAME TO SIDE FRAME SPLICE, RIGHT SIDE, STATION 360 - INSPECTION . 355
FIGURE 71: UPPER FRAME TO SIDE FRAME SPLICE, RIGHT SIDE, STATION 360 - INSPECTION . 357
FIGURE 72: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE AND INTERCOSTAL
CLIP, LEFT SIDE, STATION 360 - FABRICATION ..................... 3 5 9
FIGURE 73: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE AND INTERCOSTAL
CLIP, LEFT SIDE, STATION 360 - FASTENERS (RIVETS) INSTALLATION ....... 3 6 3
FIGURE 74: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE AND INTERCOSTAL
CLIP, LEFT SIDE, STATION 360 - FASTENERS (HI-LOKS) INSTALLATION ...... 3 6 8
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
6 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 7

FIGURE 75: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, STATION
360 - FABRICATION ..................................... 3 7 3
FIGURE 76: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, STATION
360 - FASTENERS (RIVETS) INSTALLATION ....................... 3 7 6
FIGURE 77: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, STATION
360 - FASTENERS (HI-LOKS) INSTALLATION ....................... 3 8 0
FIGURE 78: UPPER FRAME TO SIDE FRAME SPLICE, RIGHT SIDE, CARGO DOORWAY FRAME-
INSPECTION ......................................... 3 8 5
FIGURE 79: UPPER FRAME TO SIDE FRAME SPLICE, RIGHT SIDE, CARGO DOORWAY FRAME-
INSPECTION ......................................... 3 8 7
FIGURE 80: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, CARGO
DOORWAY FRAME- FABRICATION ............................ 3 8 9
FIGURE 81: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, CARGO
DOORWAY FRAME- FASTENERS (RIVETS) INSTALLATION .............. 3 9 2
FIGURE 82: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, CARGO
DOORWAY FRAME - FASTENERS (HI-LOKS) INSTALLATION ............. 3 9 6
FIGURE 83: UPPER FRAME TO SIDE FRAME SPLICE, LEFT SIDE, OVERWING FRAME - INSPECTION
................................................. 4 0 1
FIGURE 84: UPPER FRAME TO SIDE FRAME SPLICE, LEFT SIDE, OVERWING FRAME- INSPECTION
................................................. 4 0 3
FIGURE 85: UPPER FRAME TO SIDE FRAME SPLICE, RIGHT SIDE, OVERWING FRAME - INSPECTION
................................................. 4 0 5
FIGURE 86: UPPER FRAME TO SIDE FRAME SPLICE, RIGHT SIDE, OVERWING FRAME - INSPECTION
................................................. 4 0 7
FIGURE 87: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE, OVERWING
FRAME - FABRICATION ................................... 4 0 9
FIGURE 88: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE, OVERWING
FRAME - FASTENERS (RIVETS) INSTALLATION ..................... 4 1 2
FIGURE 89: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE, OVERWING
FRAME - FASTENERS (HI-LOKS) INSTALLATION .................... 4 1 6
FIGURE 90: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, OVERWING
FRAME - FABRICATION ................................... 4 2 1
FIGURE 91: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, OVERWING
FRAME - FASTENERS (RIVETS) INSTALLATION ..................... 4 2 4
FIGURE 92: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, OVERWING
FRAME - FASTENERS (HI-LOKS) INSTALLATION .................... 4 2 8
FIGURE 93: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE AND INTERCOSTAL
CLIP, LEFT SIDE, STATION 360 - FASTENERS (HI-LOKS) INSTALLATION ...... 4 3 3
FIGURE 94: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE AND INTERCOSTAL
CLIP, RIGHT SIDE, STATION 360 - FASTENERS (HI-LOKS) INSTALLATION ...... 4 3 8
FIGURE 95: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, CARGO
DOORWAY FRAME- FASTENERS (HI-LOKS) INSTALLATION .............. 4 4 3
FIGURE 96: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, LEFT SIDE, OVERWING
FRAME- FASTENERS (HI-LOKS) INSTALLATION ..................... 4 4 8
FIGURE 97: UPPER FRAME TO SIDE FRAME SPLICE, MODIFICATION ANGLE, RIGHT SIDE, OVERWING
FRAME- FASTENERS (HI-LOKS) INSTALLATION ..................... 4 5 3
FIGURE 98: UPPER FRAME TO SIDE FRAME SPLICE, POST-REPAIR INSPECTION, LEFT SIDE (RIVETS
AND HI-LOKS) NON-SHEAR TIED FRAMES ........................ 4 5 8
FIGURE 99: UPPER FRAME TO SIDE FRAME SPLICE, POST-REPAIR INSPECTION, RIGHT SIDE (RIVETS
AND HI-LOKS) NON-SHEAR TIED FRAMES ........................ 4 6 1
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
7 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 8

FIGURE 100: UPPER FRAME TO SIDE FRAME SPLICE, POST-REPAIR INSPECTION, LEFT SIDE (RIVETS
AND HI-LOKS) SHEAR TIED FRAMES ........................... 4 6 4
FIGURE 101: UPPER FRAME TO SIDE FRAME SPLICE, POST-REPAIR INSPECTION, RIGHT SIDE (RIVETS
AND HI-LOKS) SHEAR TIED FRAMES ........................... 4 6 7
FIGURE 102: UPPER FRAME TO SIDE FRAME SPLICE, POST-PREVENTATIVE MODIFICATION
INSPECTION, LEFT SIDE (RIVETS AND HI-LOKS) NON-SHEAR TIED FRAMES . . . 470
FIGURE 103: UPPER FRAME TO SIDE FRAME SPLICE, POST-PREVENTATIVE MODIFICATION
INSPECTION, RIGHT SIDE (RIVETS AND HI-LOKS) NON-SHEAR TIED FRAMES . . . 474
FIGURE 104: UPPER FRAME TO SIDE FRAME SPLICE, POST-PREVENTATIVE MODIFICATION
INSPECTION, LEFT SIDE (RIVETS AND HI-LOKS) SHEAR TIED FRAMES ....... 4 7 8
FIGURE 105: UPPER FRAME TO SIDE FRAME SPLICE, POST-PREVENTATIVE MODIFICATION
INSPECTION, RIGHT SIDE (RIVETS AND HI-LOKS) SHEAR TIED FRAMES ...... 4 8 2
FIGURE 106: UPPER FRAME TO SIDE FRAME SPLICE, POST-PREVENTATIVE MODIFICATION
INSPECTION, LEFT SIDE, STATION 360 FRAME (RIVETS AND HI-LOKS) ....... 4 8 6
FIGURE 107: UPPER FRAME TO SIDE FRAME SPLICE, POST-PREVENTATIVE MODIFICATION
INSPECTION, RIGHT SIDE, STATION 360 FRAME (RIVETS AND HI-LOKS) ...... 4 9 0
FIGURE 108: UPPER FRAME TO SIDE FRAME SPLICE, POST-PREVENTATIVE MODIFICATION
INSPECTION, LEFT SIDE, OVERWING FRAMES (RIVETS AND HI-LOKS) ....... 4 9 4
FIGURE 109: UPPER FRAME TO SIDE FRAME SPLICE, POST-PREVENTATIVE MODIFICATION
INSPECTION, RIGHT SIDE, OVERWING FRAMES (RIVETS AND HI-LOKS) ...... 4 9 8
FIGURE 110: UPPER FRAME TO SIDE FRAME SPLICE, POST-PREVENTATIVE MODIFICATION
INSPECTION, RIGHT SIDE, CARGO DOORWAY FRAMES (RIVETS AND HI-LOKS) . 502
FIGURE 111: SB 737-53-1125 FRAME REPAIR, LEFT SIDE - INSPECTION .............. 5 0 6
FIGURE 112: SB 737-53-1125 FRAME REPAIR, RIGHT SIDE - INSPECTION ............. 5 0 9
APPENDIX A: DELETED AT REVISION 1 ................................. 5 1 2
APPENDIX B: DELETED AT REVISION 1 ................................. 5 1 3
APPENDIX C: DELETED AT REVISION 1 ................................. 5 1 4
APPENDIX D: PREVENTATIVE MODIFICATION FIGURE MATRIX [Group 4, Configuration 1, 4] . . . 515
APPENDIX E: PREVENTATIVE MODIFICATION - FIGURE MATRIX [Group 5, Configuration 1, 4] . . . 518
APPENDIX F: PREVENTATIVE MODIFICATION - FIGURE MATRIX [Group 6, Configuration 1, 4] . . . 521
APPENDIX G: DELETED AT REVISION 1 ................................. 5 2 4
APPENDIX H: PREVENTATIVE MODIFICATION - FIGURE MATRIX [Group 8, Configuration 1, 4] . . . 525
APPENDIX I: PREVENTATIVE MODIFICATION - FIGURE MATRIX [Group 9, Configuration 1, 4] . . . 528
APPENDIX J: PREVENTATIVE MODIFICATION - FIGURE MATRIX  [Group 10, Configuration 1, 4] . . 531
APPENDIX K: PREVENTATIVE MODIFICATION - FIGURE MATRIX  [Group 11, Configuration 1, 4] . . 535
APPENDIX L: DELETED AT REVISION 1 ................................. 5 3 8
APPENDIX M: DELETED AT REVISION 1 .................................. 5 3 9
APPENDIX N: DELETED AT REVISION 1 ................................. 5 4 0
APPENDIX O: REPAIR AND PREVENTATIVE MODIFICATION - FIGURE MATRIX  [Group 4, Configuration
3 ,  6 ]  .............................................. 5 4 1
APPENDIX P: REPAIR AND PREVENTATIVE MODIFICATION - FIGURE MATRIX  [Group 5, Configuration
3 ,  6 ]  .............................................. 5 4 8
APPENDIX Q: REPAIR AND PREVENTATIVE MODIFICATION - FIGURE MATRIX  [Group 6, Configuration
3 ,  6 ]  .............................................. 5 5 5
APPENDIX R: DELETED AT REVISION 1 ................................. 5 6 2
APPENDIX S: REPAIR AND PREVENTATIVE MODIFICATION - FIGURE MATRIX  [Group 8, Configuration
3 ,  6 ]  .............................................. 5 6 3
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
8 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 9

APPENDIX T: REPAIR AND PREVENTATIVE MODIFICATION - FIGURE MATRIX  [Group 9, Configuration
3 ,  6 ]  .............................................. 5 7 0
APPENDIX U: REPAIR AND PREVENTATIVE MODIFICATION - FIGURE MATRIX  [Group 10, Configuration
3 ,  6 ]  .............................................. 5 7 8
APPENDIX V: REPAIR AND PREVENTATIVE MODIFICATION - FIGURE MATRIX  [Group 11, Configuration
3 ,  6 ]  .............................................. 5 8 7
APPENDIX W: STATION NUMBER - FRAME CROSS SECTION DETAIL AND FRAME PART NUMBER TABLES
................................................. 5 9 3
APPENDIX X: STATION NUMBER - INNER REPAIR ANGLE AND OUTER REPAIR ANGLE PART NUMBER
TABLES ............................................ 6 0 0
APPENDIX Y: PART 6: POST-PREVENTATIVE MODIFICATION INSPECTION - FIGURE MATRIX [Group 4,
Configuration 1, 3-4, 6-7, 9; Group 5, Configuration 1, 3-4, 6-7, 9; Group 6, Configuration 1, 3-4,
6-7, 9; Group 8, Configuration 1, 3-4, 6-7, 9; Group 9, Configuration 1, 3-4, 6-7, 9; Group 10,
Configuration 1, 3-4, 6-7, 9; Group 11, Configuration 1, 3-4, 6-7, 9] ............ 6 0 7
APPENDIX Z: PART 7: POST-REPAIR INSPECTION - FIGURE MATRIX [Group 4, Configuration 3, 6, 8, 10;
Group 5, Configuration 3, 6, 8, 10; Group 6, Configuration 3, 6, 8, 10; Group 8, Configuration
3, 6, 8, 10; Group 9, Configuration 3, 6, 8, 10; Group 10, Configuration 3, 6, 8, 10; Group 11,
Configuration 3, 6, 8, 10] ................................... 6 1 5
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
9 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 10

Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
10 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT
BLANK PAGE

### Page 11

Commercial 
Airplanes
737
Service Bulletin
ALERT
Revision Transmittal SheetNumber: 737-53A1261Original Issue: January 19, 2006
Revision 1: January 30, 2015
ATA System: 5311
SUBJECT: FUSELAGE - Frames and Bulkheads - Upper Frame To Side Frame Splice - Inspection,
Repair and Modification
This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION
Federal Aviation Administration (FAA) Airworthiness Directives AD 2008-13-12, AD 2008-13-12 R1, AD
2008-09-13, AD 2008-08-23, and AD 98-11-04 R1 are related to this service bulletin. AD 2008-13-12-R1 revised
AD 2008-13-12. The effective date of AD 2008-13-12 is August 12, 2008.
The Federal Aviation Administration (FAA) will possibly release an additional Airworthiness Directive related to
this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service
bulletin mandatory.
More work is necessary on airplanes changed or inspected in accordance with the original issue of this service
bulletin. New inspections and additional repetitive inspections are required in accordance with Revision 1 of this
service bulletin.
Post-modification and post-repair Damage Tolerance Inspection (DTI) requirements provided in Revision 1 of
this service bulletin supersede the DTI requirements for the original issue of this service bulletin, contained in
Boeing Service Bulletin 737-00-1006 Original Issue.
Groups 4-6 and 8-11 Configurations 1, 3, 4, and 6
– Frame splice preventative modification is necessary to mitigate Widespread Fatigue Damage (WFD)
concerns.
Groups 4-6 and 8-11
– Post-modification or post-repair inspections are necessary for the upper frame and side frame.
Groups 4-6 and 8-11 Configurations 2 and 5
– Repeat intervals for post-repair inspections have been lowered.
– Additional inspections are necessary for the side frame splice location above Stringer S-14.
Groups 1-3 and 7 Configurations 1,3-5
– If any crack is found during inspection, contact Boeing for instructions and accomplish the instructions.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
11 of 622

### Page 12

Groups 1-3 and 7 Configurations 2 and 6
– Contact Boeing to get instructions for the post-repair and post-modification requirements for this service
bulletin and do the work instructed by Boeing.
NOTE: Boeing endorses the new FAA rules related to Limit of Validity (LOV) and recommends immediate
and permanent removal from service of any airplane upon reaching the LOV, whether or not it is
operated under FAA jurisdiction. As such, Boeing no longer provides maintenance instructions for
airplanes that have accumulated flight cycles beyond the LOV. Airplanes in Groups 1, 2, 3 and 7
(line numbers 1-291) have accumulated flight cycles beyond the LOV of the maintenance program.
14 CFR 121.1115 and 129.115 prohibit operation of an airplane beyond its LOV.
REASON FOR REVISION
This revision is sent to:
1. Update existing Group Configurations and add new Group Configurations to address the preventative
modification, repair, and inspections of the upper frame to side frame splice that have or have not been
accomplished in accordance with the original issue of this service bulletin, Boeing Service Bulletin
737-53-1125, Boeing message M-7200-02-01294 (dated 20 Aug 2002), or Boeing Service Bulletin
737-00-1006 Original Issue.
2. Add new compliance information and requirements to address Widespread Fatigue Damage (WFD).
3. Add new part numbers for the repair and modification parts.
4. Add post-repair and post-modification inspection requirements.
5. Change work instructions for Line Numbers 1 through 291.
6. Add new preventative modification figures to address various frame splice configurations.
7. Remove cold working requirement for the optional hi-lok installation for repairs and preventative
modifications.
Terminology has been changed in the Work Instructions to agree with the terminology defined in Paragraph
3.A., General Information - Notes.
These sections were changed:
1. In Summary - Background, updated information and added data and table.
2. In Summary - Action, updated action statements.
3. In Summary - Compliance, updated Compliance Information.
4. In Paragraph 1.A., Effectivity, updated Group Configuration Table.
5. In Paragraph 1.C., Reason, updated information.
6. In Paragraph 1.D., Description, updated information.
7. In Paragraph 1.E., Compliance, added new Compliance information and Compliance Tables.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
12 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 13

8. In Paragraph 1.F., Approval, added new approval statements.
9. In Paragraph 1.G., Manpower, updated Task Hour and Elapsed Hour information.
10. In Paragraph 1.H., Weight and Balance Changes, added Group tables and updated weights information.
11. In Paragraph 1.J., References, updated list of References.
12. In Paragraph 1.K.2., Publications Affected, added Damage Tolerance Based Structural Inspection
statement.
13. In Paragraph 1.M., Software Accomplishment Summary, added new statement.
14. In Paragraph 2.C.2., Parts and Materials Supplied by the Operator, updated material information and
added Note.
15. In Paragraph 2.E., Special Tooling - Price and Availability, added note.
16. In Paragraph 2.F., Special Tooling Necessary to do this service bulletin, added tooling information and
Table.
17. In Paragraph 3.A., General Information, added new Notes.
18. In Paragraph 3.B., Work Instructions, updated work instructions, added Group Configurations, and
Condition headings.
19. Figure 3 through Figure 6 and Figure 17 through Figure 67 are changed.
20. Figure 68 through Figure 112 are added.
21. Appendix A, B, C, G, L, M, N, R are deleted.
22. Appendix D through Appendix F are changed.
23. Appendix H through Appendix K are changed.
24. Appendix O through Appendix Q are changed.
25. Appendix S through Appendix X are changed.
26. Added Appendix Y and Appendix Z.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity and format changes,
to show the location of all content changes.
Pages with no vertical lines have no changes.
REVISION HISTORY
January 19, 2006Original Issue:
January 30, 2015Revision 1:
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
13 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 14

Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
14 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT
BLANK PAGE

### Page 15

Commercial 
Airplanes
737
Service Bulletin
ALERT
SummaryNumber: 737-53A1261Original Issue: January 19, 2006
Revision 1: January 30, 2015
ATA System: 5311
SUBJECT: FUSELAGE - Frames and Bulkheads - Upper Frame To Side Frame Splice - Inspection,
Repair and Modification
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OWNER.
CONCURRENT REQUIREMENTS
None.
BACKGROUND
This service bulletin gives instructions for inspection and repair of any cracks found on frames between STA
360 and STA 907 left and right side between Stringers S-13 and S-14. Inspection and repair of any cracks found
will make sure the frame maintains structural integrity. Installation of the preventative modification in accordance
with this service bulletin will mitigate WFD concerns by preventing cracks from occurring in the frame splice
joints due to pressurization cycles. If cracks in the frames are not detected and repaired, they can grow until the
frames sever. Continued operation of the airplane with multiple adjacent cracked or severed frames along with
fuselage skin panel cracks at chem mill steps, window corner cutouts, and lap joints in the adjacent area could
result in uncontrolled decompression of the airplane.
Several operators have reported airplanes with fatigue cracks in these frames including at least two reports of
severed frames. One of the severed frames was reported at STA 747 between stringer S-13L and stringer S-14L
on a 737-200 airplane that had completed approximately 41,000 total flight cycles. Also, on the same airplane,
the adjacent frame at STA 767 had an approximately 1.3 inch long crack at the same location between stringer
S-13L and stringer S-14L. Since the release of the original issue of this service bulletin, another operator reported
a severed frame at STA 500G between stringer S-13R and stringer S-14R on a 737-400 airplane that had also
completed approximately 41,000 total flight cycles. All cracks were discovered in the upper frame and originated
from the upper end fastener hole of the frame splice common to the fail safe chord.
The original issue of this service bulletin replaced Boeing Service Bulletin 737-53-1125. Boeing Service Bulletin
737-53-1125 provided a preventative modification to reduce the stress level at the first fastener location in the
frame splice common to the fail safe chord. However, it did not adequately inspect for cracks prior to the
accomplishment of the preventative modification. Therefore, airplanes that have accomplished the preventative
modification in accordance with Boeing Service Bulletin 737-53-1125 will have to do the inspections and
preventative modifications in accordance with this service bulletin.
Boeing Fleet Team Digest (FTD) 737 FTD 53-02001 is related to this service bulletin.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
15 of 622

### Page 16

Boeing Service Related Problem (SRP) 737-53-0378 is related to this service bulletin.
Boeing Multi Operator Message MOM-12-0937-01B (dated 18 Dec 2012) is related to this service bulletin.
Boeing All Operator Message M-7200-02-01294 (dated 20 Aug 2002) is related to this service bulletin.
The fuselage frame splices addressed in this service bulletin from STA 360 to STA 907 between stringer S-13
and stringer S-14 have been determined to be structure that is susceptible to Widespread Fatigue Damage
(WFD).
This table is provided to operators for planning purposes only. Refer to the applicable sections for more
information.
ReferenceAffectedPlanning Data
Paragraph 1.A.2., Spares AffectedNoSpares Affected
Paragraph 1.E., Compliance and Paragraph
1.F., Approval
YesAD Related
Paragraph 1.H., Weight and Balance ChangesYesWeight and Balance Change
Paragraph 1.I., Electrical Load DataNoElectrical Load Changed
Paragraph 1.K., Publications AffectedNoPublications Affected
Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew
Operations Manual and/or FAA Approved Air-
plane Flight Manual)
Paragraph 2.C.1., Kits/PartsNoKits/Parts Required
Paragraph 2.C.2., Parts and Materials Supplied
by the Operator
YesOperator Supplied Parts/Material
Paragraph 2.F., Special Tooling Necessary to
do this Service Bulletin
YesSpecial Tooling Required
ACTION (PRR 35005-255RS)
1. Group 1, Configuration 1, 3-5; Group 2, Configuration 1, 3-5; Group 3, Configuration 1, 3-5;
Group 7, Configuration 1, 3-5:
On the left side and right side frames from STA 360 to STA 907, get access to the frame splices above
Stringer S-14. Do a Medium Frequency Eddy Current (MFEC) inspection of the upper frame at the
upper end fastener in the outer row of the frame splice for cracks. If any crack is found, contact Boeing
for further instructions. If no crack is found, then begin repeat inspections on the upper frame of the
frame splices from STA 360 to STA 907.
2. Group 1, Configuration 2, 6; Group 2, Configuration 2, 6; Group 3, Configuration 2, 6; Group 7,
Configuration 2, 6:
Contact Boeing to get instructions for the post-repair and post-modification requirements for this service
bulletin and do the work instructed by Boeing.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
16 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 17

3. Group 4, Configuration 1, 4; Group 5, Configuration 1, 4; Group 6, Configuration 1, 4; Group 8,
Configuration 1, 4; Group 9, Configuration 1, 4; Group 10, Configuration 1, 4; Group 11,
Configuration 1, 4:
On the left side and right side frames from STA 360 to STA 907, get access to the frame splices above
Stringer S-14. Do a Medium Frequency Eddy Current (MFEC) inspection of the upper frame at the
upper end fastener in the outer row of the frame splice for cracks. The MFEC is not required if the
preventative modification is being accomplished. If any crack is found, contact Boeing with details of
the crack, for further instructions. If no crack is found, then begin repeat inspections on the upper frame
of the frame splices from STA 360 to STA 907 until the preventative modification is accomplished.
Accomplishment of the preventative modification terminates the initial and repeat inspections on the
upper frame of the frame splices from STA 360 to STA 907. Do the post-modification damage tolerance
inspections of the modified frame splice.
4. Group 4, Configuration 2, 5; Group 5, Configuration 2, 5; Group 6, Configuration 2, 5; Group 8,
Configuration 2, 5; Group 9, Configuration 2, 5; Group 10, Configuration 2, 5; Group 11,
Configuration 2, 5:
On the left side and right side frames from STA 360 to STA 907 get access to the upper frame above
Stringer S-14 at Boeing Service Bulletin 737-53-1125 Frame Repair. Make sure the accomplished
frame repair is within the limitations of this service bulletin. If the frame repair is not within the limitations
of this service bulletin, contact Boeing for further instructions. Otherwise, do a High Frequency Eddy
Current (HFEC) inspection of the upper frame and the side frame for cracks. If any crack is found,
contact Boeing to get instructions for the repair and do the work instructed by Boeing. If no crack is
found, then do the repeat inspections of the upper frame and the side frame.
5. Group 4, Configuration 3, 6; Group 5, Configuration 3, 6; Group 6, Configuration 3, 6; Group 8,
Configuration 3, 6; Group 9, Configuration 3, 6; Group 10, Configuration 3, 6; Group 11,
Configuration 3, 6:
On the left side and right side frames from STA 360 to STA 907, get access to the frame splices above
Stringer S-14. Do a MFEC inspection of the upper frame at the upper end fastener of the frame splice
common to the fail safe chord for cracks. The MFEC is not required if the preventative modification is
being accomplished. If any crack is found, do the frame repair. Do the post-repair damage tolerance
inspections of the repaired frame splice. If no crack is found, then do the repeat inspections until the
preventative modification is accomplished. Accomplishment of the preventative modification is terminating
action for the initial and repeat inspections. Do the post-modification damage tolerance inspections of
the modified frame splice.
6. Group 4, Configuration 7, 9; Group 5, Configuration 7, 9; Group 6, Configuration 7, 9; Group 8,
Configuration 7, 9; Group 9, Configuration 7, 9; Group 10, Configuration 7, 9; Group 11,
Configuration 7, 9:
On the left side and right side frames from STA 360 to STA 907 get access to the frame splice
modification above Stringer S-14. Do a HFEC post-modification inspection for cracks. If any crack is
found, contact Boeing for further instructions. If no crack is found, then do the repeat inspections of
the frame splice modification.
7. Group 4, Configuration 8, 10; Group 5, Configuration 8, 10; Group 6, Configuration 8, 10; Group
8, Configuration 8, 10; Group 9, Configuration 8, 10; Group 10, Configuration 8, 10; Group 11,
Configuration 8, 10:
On the left side and right side frames from STA 360 to STA 907 get access to the frame splice repair
above Stringer S-14. Do a HFEC post-repair inspection for cracks. If any crack is found, contact Boeing
for further instructions. If no crack is found, then do the repeat inspections of the frame splice repair.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
17 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 18

EFFECTIVITY
737-100, 737-200, 737-200C, 737-300, 737-400, 737-500 Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for
the list of affected airplanes.
COMPLIANCE
Federal Aviation Administration (FAA) Airworthiness Directives AD 2008-13-12, AD 2008-13-12 R1, AD
2008-09-13, AD 2008-08-23, and AD 98-11-04 R1 are related to this service bulletin. AD 2008-13-12-R1 revised
AD 2008-13-12. The effective date of AD 2008-13-12 is August 12, 2008.
The Federal Aviation Administration (FAA) will possibly release an additional Airworthiness Directive related to
this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service
bulletin mandatory.
Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION
Boeing warranty remedies are not available for the configuration changes, inspection, and repair procedures
given in this service bulletin.
MANPOWER
Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION
Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
18 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 19 (OCR)

BOEING SERVICE BULLETIN 737-53A1261
ALERT  ALERT
STA
907
STA
360
/0  8-13R
UPPER
FRAME
CRACK
TYPICAL
• S-14R
— SIDE FRAME
FWD '
FAIL SAFE CHORD
RIGHT SIDE SHOWN LEFT SIDE OPPOSITE
TYPICAL FRAME STATION 360-907
CONFIGURATION 3 AND 6 AIRPLANE SHOWN  W82321
Original Issue: January 19, 2006
Revision 1: January 30, 2015  Export Controlled ECCN: 9E991 - BOEING  737-53A1261
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.  19 of 622

### Page 20

Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
20 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT
BLANK PAGE

### Page 21

Commercial 
Airplanes
737
Service Bulletin
ALERT
Number: 737-53A1261
Original Issue: January 19, 2006
Revision 1: January 30, 2015
ATA System: 5311
SUBJECT: FUSELAGE - Frames and Bulkheads - Upper Frame To Side Frame Splice - Inspection,
Repair and Modification
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO
THE NEW OWNER.
1.    PLANNING INFORMATION
A. Effectivity
1. Airplanes
This service bulletin is for the airplanes shown below.
Refer to Service Bulletin Index Document D6-19567 Part 3 for Airplane Variable Number, Line
Number, and Serial Number data.
NOTE: Airplanes are broken into groups that align with sub model. 737-100, 737-200 and
737-200C have multiple groups because they have variation in which body stations are
shear tied between Stringer S-13 and Stringer S-14, or whether station (STA) 360 requires
inspection. Refer to the airplane/Group listing in the table further below.
Each Airplane can have multiple configurations depending on previous frame splice
inspections, modifications, and repairs. Operators must determine what configuration is
applicable to each affected frame station location. Refer to Figure 1 through Figure 12
for a list of affected station locations.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
21 of 622

### Page 22

DESCRIPTIONCONFIGURATIONGROUP
737-100 Airplanes, Line Number 1 through 291.-1
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53 1125.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
5
Airplanes that have accomplished the preventative modification or
repair in accordance with the original issue of this service bulletin or
Boeing message M-7200-02-01294 (dated 20 Aug 2002).
6
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
22 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 23

DESCRIPTIONCONFIGURATIONGROUP
737-100 Airplanes, Line Number 1 through 291.-2
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53 1125.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
5
Airplanes that have accomplished the preventative modification or
repair in accordance with the original issue of this service bulletin or
Boeing message M-7200-02-01294 (dated 20 Aug 2002), without
deviation.
6
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
23 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 24

DESCRIPTIONCONFIGURATIONGROUP
737-200 Airplanes, Line Number 1 through 291.-3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53 1125.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin
5
Airplanes that have accomplished the preventative modification or
repair in accordance with the original issue of this service bulletin or
Boeing message M-7200-02-01294 (dated 20 Aug 2002), without
deviation.
6
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
24 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 25

DESCRIPTIONCONFIGURATIONGROUP
737-200 Airplanes, Line Number 292 through 1919.-4
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have not accomplished
any inspection in accordance with the original issue of this service
bulletin.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have accomplished
at least one inspection in accordance with the original issue of this
service bulletin.
5
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
6
Airplanes that have accomplished the preventative modification in
accordance with the original issue of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have not accomplished the post-modification inspections for the
original issue of this service bulletin in accordance with the Boeing
Service Bulletin 737-00-1006 Original Issue and have not
accomplished the inspections for Structural Significant Items (SSI's)
F-33C, F-34C, and F-36 mandated by AD 98-11-04 R1.
7
Airplanes that have accomplished the frame repair in accordance
with the original issue of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
not accomplished the post-repair inspections for the original issue of
this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue and have not accomplished the
inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
98-11-04 R1.
8
9
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
25 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 26

DESCRIPTIONCONFIGURATIONGROUP
Airplanes that have accomplished the preventative modification in
accordance with the original revision of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have accomplished at least one post-modification inspection for
the original issue of this service bulletin in accordance with Boeing
Service Bulletin 737-00-1006 Original Issue or have accomplished
the inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
98-11-04 R1.
Airplanes that have accomplished the frame repair in accordance
with the original revision of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
accomplished at least one post-repair inspection for the original issue
of this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue or have accomplished the inspections
for SSI's F-33C, F-34C, and F-36 mandated by AD 98-11-04 R1.
10
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
26 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 27

DESCRIPTIONCONFIGURATIONGROUP
737-200 Airplanes, Line Number 292 through 1919.-5
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have not accomplished
any inspection in accordance with the original issue of this service
bulletin.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have accomplished
at least one inspection in accordance with the original issue of this
service bulletin.
5
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
6
Airplanes that have accomplished the preventative modification in
accordance with the original issue of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have not accomplished the post-modification inspections for the
original issue of this service bulletin in accordance with the Boeing
Service Bulletin 737-00-1006 Original Issue and have not
accomplished the inspections for SSI's F-33C, F-34C, and F-36
mandated by AD 98-11-04 R1.
7
Airplanes that have accomplished the frame repair in accordance
with the original issue of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
not accomplished the post-repair inspections for the original issue of
this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue and have not accomplished the
inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
98-11-04 R1.
8
9
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
27 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 28

DESCRIPTIONCONFIGURATIONGROUP
Airplanes that have accomplished the preventative modification in
accordance with the original revision of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have accomplished at least one post-modification inspection for
the original issue of this service bulletin in accordance with Boeing
Service Bulletin 737-00-1006 Original Issue or have accomplished
the inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
98-11-04 R1.
Airplanes that have accomplished the frame repair in accordance
with the original revision of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
accomplished at least one post-repair inspection for the original issue
of this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue or have accomplished the inspections
for SSI's F-33C, F-34C, and F-36 mandated by AD 98-11-04 R1.
10
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
28 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 29

DESCRIPTIONCONFIGURATIONGROUP
737-200 Airplanes, Line Number 292 through 1919.-6
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have not accomplished
any inspection in accordance with the original issue of this service
bulletin.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have accomplished
at least one inspection in accordance with the original issue of this
service bulletin.
5
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
6
Airplanes that have accomplished the preventative modification in
accordance with the original issue of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have not accomplished the post-modification inspections for the
original issue of this service bulletin in accordance with the Boeing
Service Bulletin 737-00-1006 Original Issue and have not
accomplished the inspections for SSI's F-33C, F-34C, and F-36
mandated by AD 98-11-04 R1.
7
Airplanes that have accomplished the frame repair in accordance
with the original issue of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
not accomplished the post-repair inspections for the original issue of
this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue and have not accomplished the
inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
98-11-04 R1.
8
9
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
29 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 30

DESCRIPTIONCONFIGURATIONGROUP
Airplanes that have accomplished the preventative modification in
accordance with the original revision of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have accomplished at least one post-modification inspection for
the original issue of this service bulletin in accordance with Boeing
Service Bulletin 737-00-1006 Original Issue or have accomplished
the inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
98-11-04 R1.
Airplanes that have accomplished the frame repair in accordance
with the original revision of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
accomplished at least one post-repair inspection for the original issue
of this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue or have accomplished the inspections
for SSI's F-33C, F-34C, and F-36 mandated by AD 98-11-04 R1.
10
737-200C Airplanes, Line Numbers 1 through 291.-7
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53 1125.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
5
Airplanes that have accomplished the preventative modification or
repair in accordance with the original issue of this service bulletin or
Boeing message M-7200-02-01294 (dated 20 Aug 2002), without
deviation.
6
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
30 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 31

DESCRIPTIONCONFIGURATIONGROUP
737-200C Airplanes, Line Number 292 through 1919.-8
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have not accomplished
any inspection in accordance with the original issue of this service
bulletin.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have accomplished
at least one inspection in accordance with the original issue of this
service bulletin.
5
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
6
Airplanes that have accomplished the preventative modification in
accordance with the original issue of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have not accomplished the post-modification inspections for the
original issue of this service bulletin in accordance with the Boeing
Service Bulletin 737-00-1006 Original Issue and have not
accomplished the inspections for SSI's F-33C, F-34C, and F-36
mandated by AD 2008-08-23.
7
Airplanes that have accomplished the frame repair in accordance
with the original issue of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
not accomplished the post-repair inspections for the original issue of
this service bulletin in accordance with Boeing Service Bulletin
737-00-1006 Original Issue and have not accomplished the
inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
2008-08-23.
8
9
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
31 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 32

DESCRIPTIONCONFIGURATIONGROUP
Airplanes that have accomplished the preventative modification in
accordance with the original revision of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have accomplished at least one post-modification inspection for
the original issue of this service bulletin in accordance with Boeing
Service Bulletin 737-00-1006 Original Issue or have accomplished
the inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
2008-08-23.
Airplanes that have accomplished the frame repair in accordance
with the original revision of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
accomplished at least one post-repair inspection for the original issue
of this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue or have accomplished the inspections
for SSI's F-33C, F-34C, and F-36 mandated by AD 2008-08-23.
10
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
32 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 33

DESCRIPTIONCONFIGURATIONGROUP
737-300 Airplanes, Line Number 292 through 1919.-9
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have not accomplished
any inspection in accordance with the original issue of this service
bulletin.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have accomplished
at least one inspection in accordance with the original issue of this
service bulletin.
5
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
6
Airplanes that have accomplished the preventative modification in
accordance with the original issue of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have not accomplished the post-modification inspections for the
original issue of this service bulletin in accordance with the Boeing
Service Bulletin 737-00-1006 Original Issue and have not
accomplished the inspections for SSI's F-33C, F-34C, and F-36
mandated by AD 2008-09-13.
7
Airplanes that have accomplished the frame repair in accordance
with the original issue of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
not accomplished the post-repair inspections for the original issue of
this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue and have not accomplished the
inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
2008-09-13.
8
9
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
33 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 34

DESCRIPTIONCONFIGURATIONGROUP
Airplanes that have accomplished the preventative modification in
accordance with the original revision of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have accomplished at least one post-modification inspection for
the original issue of this service bulletin in accordance with Boeing
Service Bulletin 737-00-1006 Original Issue or have accomplished
the inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
2008-09-13.
Airplanes that have accomplished the frame repair in accordance
with the original revision of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
accomplished at least one post-repair inspection for the original issue
of this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue or have accomplished the inspections
for SSI's F-33C, F-34C, and F-36 mandated by AD 2008-09-13.
10
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
34 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 35

DESCRIPTIONCONFIGURATIONGROUP
737-400 Airplanes, Line Number 292 through 1919.-10
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have not accomplished
any inspection in accordance with the original issue of this service
bulletin.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have accomplished
at least one inspection in accordance with the original issue of this
service bulletin.
5
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
6
Airplanes that have accomplished the preventative modification in
accordance with the original issue of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have not accomplished the post-modification inspections for the
original issue of this service bulletin in accordance with the Boeing
Service Bulletin 737-00-1006 Original Issue and have not
accomplished the inspections for SSI's F-33C, F-34C, and F-36
mandated by AD 2008-09-13.
7
Airplanes that have accomplished the frame repair in accordance
with the original issue of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
not accomplished the post-repair inspections for the original issue of
this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue and have not accomplished the
inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
2008-09-13.
8
9
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
35 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 36

DESCRIPTIONCONFIGURATIONGROUP
Airplanes that have accomplished the preventative modification in
accordance with the original revision of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have accomplished at least one post-modification inspection for
the original issue of this service bulletin in accordance with Boeing
Service Bulletin 737-00-1006 Original Issue or have accomplished
the inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
2008-09-13.
Airplanes that have accomplished the frame repair in accordance
with the original revision of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
accomplished at least one post-repair inspection for the original issue
of this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue or have accomplished the inspections
for SSI's F-33C, F-34C, and F-36 mandated by AD 2008-09-13.
10
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
36 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 37

DESCRIPTIONCONFIGURATIONGROUP
737-500 Airplanes, Line Number 292 through 1919.-11
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have not
accomplished any inspection in accordance with the original issue
of this service bulletin.
1
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have not accomplished
any inspection in accordance with the original issue of this service
bulletin.
2
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have not accomplished any inspection in
accordance with the original issue of this service bulletin.
3
Airplanes that have accomplished the preventative modification in
accordance with Boeing Service Bulletin 737-53-1125 and have
accomplished at least one inspection in accordance with the original
issue of this service bulletin.
4
Airplanes that have accomplished the frame repair in accordance
with Boeing Service Bulletin 737-53-1125 and have accomplished
at least one inspection in accordance with the original issue of this
service bulletin.
5
Airplanes that have not accomplished Boeing Service Bulletin
737-53-1125 and have accomplished at least one inspection in
accordance with the original issue of this service bulletin.
6
Airplanes that have accomplished the preventative modification in
accordance with the original issue of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have not accomplished the post-modification inspections for the
original issue of this service bulletin in accordance with the Boeing
Service Bulletin 737-00-1006 Original Issue and have not
accomplished the inspections for SSI's F-33C, F-34C, and F-36
mandated by AD 2008-09-13.
7
Airplanes that have accomplished the frame repair in accordance
with the original issue of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
not accomplished the post-repair inspections for the original issue of
this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue and have not accomplished the
inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
2008-09-13.
8
9
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
37 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 38

DESCRIPTIONCONFIGURATIONGROUP
Airplanes that have accomplished the preventative modification in
accordance with the original revision of this service bulletin or Boeing
message M-7200-02-01294 (dated 20 Aug 2002), without deviation,
and have accomplished at least one post-modification inspection for
the original issue of this service bulletin in accordance with Boeing
Service Bulletin 737-00-1006 Original Issue or have accomplished
the inspections for SSI's F-33C, F-34C, and F-36 mandated by AD
2008-09-13.
Airplanes that have accomplished the frame repair in accordance
with the original revision of this service bulletin or Boeing message
M-7200-02-01294 (dated 20 Aug 2002), without deviation, and have
accomplished at least one post-repair inspection for the original issue
of this service bulletin in accordance with the Boeing Service Bulletin
737-00-1006 Original Issue or have accomplished the inspections
for SSI's F-33C, F-34C, and F-36 mandated by AD 2008-09-13.
10
Airplane Models:
737-100, 737-200, 737-200C, 737-300, 737-400, 737-500
GroupVariable Number
1PA001 - PA013
2PA014 - PA022
2PA231 - PA232
2PC001 - PC005
3PG001 - PG075
3PG199
3PG201 - PG230
3PG251 - PG255
3PG271 - PG279
3PG301 - PG314
3PG331 - PG332
3PG351 - PG356
3PG375
3PG401 - PG403
3PG431 - PG442
3PG471 - PG475
3PG501 - PG505
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
38 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 39

GroupVariable Number
3PG571 - PG583
4PG584 - PG586
3PG621 - PG630
3PG651 - PG652
3PG701 - PG705
4PH001
4PH011 - PH013
4PH021 - PH024
3PH701 - PH715
3PH731 - PH732
3PH741 - PH742
4PH743
3PJ001 - PJ002
5PJ003 - PJ009
3PJ031 - PJ032
3PJ071 - PJ072
3PJ101 - PJ104
5PJ105 - PJ119
6PJ201 - PJ219
5PK026 - PK029
5PK041 - PK053
5PK061 - PK070
5PK081 - PK082
5PK091 - PK099
5PK101 - PK103
5PK111 - PK120
5PK141 - PK146
5PK201 - PK204
5PK211 - PK223
5PK231 - PK241
5PK251 - PK258
5PK271 - PK274
5PK281 - PK289
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
39 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 40

GroupVariable Number
5PK291
5PK301 - PK318
5PK341
5PK351 - PK361
5PK391
5PK431 - PK433
5PK451 - PK452
5PK461 - PK469
5PK495
5PK501 - PK504
5PK511 - PK515
5PK519
5PK521 - PK528
5PK541 - PK565
5PK581
5PK591 - PK599
5PK601 - PK617
5PK621 - PK637
5PK641 - PK642
5PK661 - PK666
5PK671 - PK681
5PK691 - PK697
5PK711 - PK716
5PK731 - PK765
5PK771 - PK779
5PK801 - PK804
5PK819 - PK827
5PK830
5PK861 - PK863
5PK871 - PK874
5PK881 - PK884
5PK901 - PK938
5PK971 - PK974
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
40 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 41

GroupVariable Number
5PL001 - PL028
5PL061
5PL081
5PL101 - PL113
5PL151
5PL171 - PL172
5PL201 - PL203
5PL221
5PL401 - PL417
5PL421
5PL441
5PL451 - PL456
5PL471
5PL491
5PL501 - PL506
5PL551 - PL562
5PL581
5PL601 - PL603
5PL611
5PL621 - PL626
5PL631 - PL632
3PL711 - PL712
3PL716
5PL717 - PL747
5PL756
5PL758
5PL761 - PL770
5PL781 - PL788
5PL793
3PL801 - PL803
5PM001 - PM006
5PM016 - PM017
5PM021 - PM023
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
41 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 42

GroupVariable Number
5PM051 - PM066
5PM101 - PM119
5PM141 - PM142
5PM171
5PM181
5PM251 - PM255
5PM281 - PM283
9PM381 - PM392
5PN001 - PN002
5PN021 - PN043
5PN081 - PN086
5PN101 - PN117
5PN131 - PN163
5PN401 - PN420
5PN431 - PN433
5PN451 - PN456
5PN471 - PN474
5PN481
5PN491 - PN493
5PN501 - PN502
5PN511 - PN512
5PN521
9PP001 - PP054
9PP101 - PP148
9PP161 - PP169
9PP181 - PP199
9PP201 - PP205
9PP221
9PP231 - PP243
9PP281 - PP286
9PP301 - PP305
9PP351 - PP353
9PP376 - PP384
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
42 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 43

GroupVariable Number
9PP391 - PP393
9PP401 - PP440
9PP471 - PP475
9PP501 - PP510
9PP521 - PP522
9PP631 - PP634
9PP651 - PP652
9PP671 - PP699
9PP701 - PP733
9PP771 - PP779
9PP801 - PP808
9PP821 - PP827
9PP831 - PP848
9PP851 - PP852
9PP861 - PP873
9PP891 - PP899
9PP901 - PP924
9PP931 - PP936
9PP946 - PP948
9PP951 - PP952
9PP961 - PP967
9PP981 - PP987
9PP991
9PP993
9PQ001 - PQ016
9PQ026 - PQ041
9PQ051 - PQ073
9PQ086 - PQ092
9PQ101 - PQ197
9PQ221 - PQ229
9PQ231 - PQ236
9PQ241 - PQ243
9PQ251 - PQ255
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
43 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 44

GroupVariable Number
9PQ281 - PQ286
9PQ301 - PQ305
9PQ331 - PQ332
9PS641 - PS642
9PS666 - PS668
11PT021 - PT023
11PT101
11PT121 - PT123
11PT146
11PT181 - PT182
11PT211 - PT213
11PT295
11PU001 - PU007
10PV001 - PV040
10PW001 - PW036
10PW051
10PW061 - PW063
10PW091 - PW093
10PW111 - PW117
10PW161
10PW501 - PW503
10PW511 - PW518
10PW531 - PW535
10PW561 - PW563
10PW571 - PW573
10PW591 - PW594
10PW611 - PW615
10PW631 - PW632
10PW661
7PX071
7PX701
7PY001 - PY008
7PY021
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
44 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 45

GroupVariable Number
8PY022
7PY031
8PY036 - PY037
8PY046 - PY048
8PY051 - PY053
8PY056 - PY057
8PY101 - PY103
8PY111 - PY113
8PY131 - PY135
8PY141 - PY143
8PY151 - PY154
8PY156 - PY157
8PY161 - PY162
8PY166
8PY191
8PY201
8PY221 - PY222
8PY231
8PY241 - PY244
8PY270 - PY275
8PY281
8PY286
7PY301 - PY304
7PY321 - PY323
7PY341 - PY346
7PY361 - PY362
7PY381
8PY401
8PY409 - PY411
8PY421 - PY422
8PY441
8PY451
8PY461 - PY463
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
45 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 46

GroupVariable Number
8PY591 - PY595
8PY611 - PY612
8PY621
8PY631
8PY651
8PY671 - PY672
8PY721
8PY741
2. Spares Affected
None.
B. Concurrent Requirements
None.
C. Reason
This service bulletin gives instructions for inspection and repair of any cracks found on frames between
STA 360 and STA 907 left and right side between Stringers S-13 and S-14. Inspection and repair of
any cracks found will make sure the frame maintains structural integrity. Installation of the preventative
modification in accordance with this service bulletin will mitigate WFD concerns by preventing cracks
from occurring in the frame splice joints due to pressurization cycles. If cracks in the frames are not
detected and repaired, they can grow until the frames sever. Continued operation of the airplane with
multiple adjacent cracked or severed frames along with fuselage skin panel cracks at chem mill steps,
window corner cutouts, and lap joints in the adjacent area could result in uncontrolled decompression
of the airplane.
Several operators have reported airplanes with fatigue cracks in these frames including at least two
reports of severed frames. One of the severed frames was reported at STA 747 between stringer S-13L
and stringer S-14L on a 737-200 airplane that had completed approximately 41,000 total flight cycles.
Also, on the same airplane, the adjacent frame at STA 767 had an approximately 1.3 inch long crack
at the same location between stringer S-13L and stringer S-14L. Since the release of the original issue
of this service bulletin, another operator reported a severed frame at STA 500G between stringer S-13R
and stringer S-14R on a 737-400 airplane that had also completed approximately 41,000 total flight
cycles. All cracks were discovered in the upper frame and originated from the upper end fastener hole
of the frame splice common to the fail safe chord.
The original issue of this service bulletin replaced Boeing Service Bulletin 737-53-1125. Boeing Service
Bulletin 737-53-1125 provided a preventative modification to reduce the stress level at the first fastener
location in the frame splice common to the fail safe chord. However, it did not adequately inspect for
cracks prior to the accomplishment of the preventative modification. Therefore, airplanes that have
accomplished the preventative modification in accordance with Boeing Service Bulletin 737-53-1125
will have to do the inspections and preventative modifications in accordance with this service bulletin.
Boeing Fleet Team Digest (FTD) 737 FTD 53-02001 is related to this service bulletin.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
46 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 47

Boeing Service Related Problem (SRP) 737-53-0378 is related to this service bulletin.
Boeing Multi Operator Message MOM-12-0937-01B (dated 18 Dec 2012) is related to this service
bulletin.
Boeing All Operator Message M-7200-02-01294 (dated 20 Aug 2002) is related to this service bulletin.
The fuselage frame splices addressed in this service bulletin from STA 360 to STA 907 between stringer
S-13 and stringer S-14 have been determined to be structure that is susceptible to Widespread Fatigue
Damage (WFD).
Revision 1 is sent to:
1. Update existing Group Configurations and add new Group Configurations to address the
preventative modification, repair, and inspections of the upper frame to side frame splice that have
or have not been accomplished in accordance with the original issue of this service bulletin, Boeing
Service Bulletin 737-53-1125, Boeing message M-7200-02-01294 (dated 20 Aug 2002), or Boeing
Service Bulletin 737-00-1006 Original Issue.
2. Add new compliance information and requirements to address Widespread Fatigue Damage
(WFD).
3. Add new part numbers for the repair and modification parts.
4. Add post-repair and post-modification inspection requirements.
5. Change work instructions for Line Numbers 1 through 291.
6. Add new preventative modification figures to address various frame splice configurations.
7. Remove cold working requirement for the optional hi-lok installation for repairs and preventative
modifications.
D. Description
1. Group 1, Configuration 1, 3-5; Group 2, Configuration 1, 3-5; Group 3, Configuration 1, 3-5;
Group 7, Configuration 1, 3-5:
On the left side and right side frames from STA 360 to STA 907, get access to the frame splices
above Stringer S-14. Do a Medium Frequency Eddy Current (MFEC) inspection of the upper frame
at the upper end fastener in the outer row of the frame splice for cracks. If any crack is found,
contact Boeing for further instructions. If no crack is found, then begin repeat inspections on the
upper frame of the frame splices from STA 360 to STA 907.
2. Group 1, Configuration 2, 6; Group 2, Configuration 2, 6; Group 3, Configuration 2, 6; Group
7, Configuration 2, 6:
Contact Boeing to get instructions for the post-repair and post-modification requirements for this
service bulletin and do the work instructed by Boeing.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
47 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 48

3. Group 4, Configuration 1, 4; Group 5, Configuration 1, 4; Group 6, Configuration 1, 4; Group
8, Configuration 1, 4; Group 9, Configuration 1, 4; Group 10, Configuration 1, 4; Group 11,
Configuration 1, 4:
On the left side and right side frames from STA 360 to STA 907, get access to the frame splices
above Stringer S-14. Do a Medium Frequency Eddy Current (MFEC) inspection of the upper frame
at the upper end fastener in the outer row of the frame splice for cracks. The MFEC is not required
if the preventative modification is being accomplished. If any crack is found, contact Boeing with
details of the crack, for further instructions. If no crack is found, then begin repeat inspections on
the upper frame of the frame splices from STA 360 to STA 907 until the preventative modification
is accomplished. Accomplishment of the preventative modification terminates the initial and repeat
inspections on the upper frame of the frame splices from STA 360 to STA 907. Do the
post-modification damage tolerance inspections of the modified frame splice.
4. Group 4, Configuration 2, 5; Group 5, Configuration 2, 5; Group 6, Configuration 2, 5; Group
8, Configuration 2, 5; Group 9, Configuration 2, 5; Group 10, Configuration 2, 5; Group 11,
Configuration 2, 5:
On the left side and right side frames from STA 360 to STA 907 get access to the upper frame
above Stringer S-14 at Boeing Service Bulletin 737-53-1125 Frame Repair. Make sure the
accomplished frame repair is within the limitations of this service bulletin. If the frame repair is not
within the limitations of this service bulletin, contact Boeing for further instructions. Otherwise, do
a High Frequency Eddy Current (HFEC) inspection of the upper frame and the side frame for
cracks. If any crack is found, contact Boeing to get instructions for the repair and do the work
instructed by Boeing. If no crack is found, then do the repeat inspections of the upper frame and
the side frame.
5. Group 4, Configuration 3, 6; Group 5, Configuration 3, 6; Group 6, Configuration 3, 6; Group
8, Configuration 3, 6; Group 9, Configuration 3, 6; Group 10, Configuration 3, 6; Group 11,
Configuration 3, 6:
On the left side and right side frames from STA 360 to STA 907, get access to the frame splices
above Stringer S-14. Do a MFEC inspection of the upper frame at the upper end fastener of the
frame splice common to the fail safe chord for cracks. The MFEC is not required if the preventative
modification is being accomplished. If any crack is found, do the frame repair. Do the post-repair
damage tolerance inspections of the repaired frame splice. If no crack is found, then do the repeat
inspections until the preventative modification is accomplished. Accomplishment of the preventative
modification is terminating action for the initial and repeat inspections. Do the post-modification
damage tolerance inspections of the modified frame splice.
6. Group 4, Configuration 7, 9; Group 5, Configuration 7, 9; Group 6, Configuration 7, 9; Group
8, Configuration 7, 9; Group 9, Configuration 7, 9; Group 10, Configuration 7, 9; Group 11,
Configuration 7, 9:
On the left side and right side frames from STA 360 to STA 907 get access to the frame splice
modification above Stringer S-14. Do a HFEC post-modification inspection for cracks. If any crack
is found, contact Boeing for further instructions. If no crack is found, then do the repeat inspections
of the frame splice modification.
7. Group 4, Configuration 8, 10; Group 5, Configuration 8, 10; Group 6, Configuration 8, 10;
Group 8, Configuration 8, 10; Group 9, Configuration 8, 10; Group 10, Configuration 8, 10;
Group 11, Configuration 8, 10:
On the left side and right side frames from STA 360 to STA 907 get access to the frame splice
repair above Stringer S-14. Do a HFEC post-repair inspection for cracks. If any crack is found,
contact Boeing for further instructions. If no crack is found, then do the repeat inspections of the
frame splice repair.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
48 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 49

More work is necessary on airplanes changed or inspected in accordance with the original issue of this
service bulletin. New inspections and additional repetitive inspections are required in accordance with
Revision 1 of this service bulletin.
Post-modification and post-repair Damage Tolerance Inspection (DTI) requirements provided in Revision
1 of this service bulletin supersede the DTI requirements for the original issue of this service bulletin,
contained in Boeing Service Bulletin 737-00-1006 Original Issue.
Group 4, Configuration 1, 3-4, 6; Group 5, Configuration 1, 3-4, 6; Group 6, Configuration 1, 3-4,
6; Group 8, Configuration 1, 3-4, 6; Group 9, Configuration 1, 3-4, 6; Group 10, Configuration 1,
3-4, 6; Group 11, Configuration 1, 3-4, 6:
Frame splice preventative modification is necessary to mitigate Widespread Fatigue Damage (WFD)
concerns.
Group 4-6, 8-11:
Post-modification or post-repair inspections are necessary for the upper frame and side frame.
Group 4, Configuration 2, 5; Group 5, Configuration 2, 5; Group 6, Configuration 2, 5; Group 8,
Configuration 2, 5; Group 9, Configuration 2, 5; Group 10, Configuration 2, 5; Group 11,
Configuration 2, 5:
Repeat intervals for post-repair inspections have been lowered.
Additional inspections are necessary for the side frame splice location above Stringer S-14.
Group 1, Configuration 1, 3-5; Group 2, Configuration 1, 3-5; Group 3, Configuration 1, 3-5;
Group 7, Configuration 1, 3-5:
If any crack is found during inspection, contact Boeing for instructions and accomplish the instructions.
Group 1, Configuration 2, 6; Group 2, Configuration 2, 6; Group 3, Configuration 2, 6; Group 7,
Configuration 2, 6:
Contact Boeing to get instructions for the post-repair and post-modification requirements for this service
bulletin and do the work instructed by Boeing.
NOTE: Boeing endorses the new FAA rules related to Limit of Validity (LOV) and recommends
immediate and permanent removal from service of any airplane upon reaching the LOV,
whether or not it is operated under FAA jurisdiction. As such, Boeing no longer provides
maintenance instructions for airplanes that have accumulated flight cycles beyond the LOV.
Airplanes in Groups 1, 2, 3 and 7 (line numbers 1-291) have accumulated flight cycles beyond
the LOV of the maintenance program. 14 CFR 121.1115 and 129.115 prohibit operation of
an airplane beyond its LOV.
The work in this service bulletin is done in the maintenance zone(s) given below.
Group 1-2:
Affected Maintenance Zones
ZoneModel
1-7, 1-8737-100
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
49 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 50

Group 3-6:
Affected Maintenance Zones
ZoneModel
1-7, 1-8737-200
Group 7-8:
Affected Maintenance Zones
ZoneModel
1-7, 1-8737-200C
Group 9:
Affected Maintenance Zones
ZoneModel
107, 108737-300
Group 10:
Affected Maintenance Zones
ZoneModel
107, 108737-400
Group 11:
Affected Maintenance Zones
ZoneModel
107, 108737-500
E. Compliance
Federal Aviation Administration (FAA) Airworthiness Directives AD 2008-13-12, AD 2008-13-12 R1,
AD 2008-09-13, AD 2008-08-23, and AD 98-11-04 R1 are related to this service bulletin. AD
2008-13-12-R1 revised AD 2008-13-12. The effective date of AD 2008-13-12 is August 12, 2008.
The Federal Aviation Administration (FAA) will possibly release an additional Airworthiness Directive
related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times
given in this service bulletin mandatory.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
50 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 51

NOTE: Boeing endorses the new FAA rules related to Limit of Validity (LOV) and recommends
immediate and permanent removal from service of any airplane upon reaching the LOV,
whether or not it is operated under FAA jurisdiction. As such, Boeing no longer provides
maintenance instructions for airplanes that have accumulated flight cycles beyond the LOV.
Airplanes in Groups 1, 2, 3 and 7 (line numbers 1-291) have accumulated flight cycles beyond
the LOV of the airplane. 14 CFR 121.1115 and 129.115 prohibit operation of an airplane
beyond its LOV.
NOTE: The damage tolerance inspections specified in Table 12, Table 13, Table 14, Table 15, Table
16 and Table 17 below may be used in support of compliance with 14 Code of Federal
Regulations, Section 121.1109 or 129.109. The post-repair and post-modification inspection
recommendations given in this service bulletin supersede the damage tolerance inspection
recommendations for the original issue of this service bulletin given in Paragraph 1.E.,
Compliance, Table 2, of Boeing Service Bulletin 737-00-1006 Original Issue.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
51 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 52

Do the required actions in accordance with Paragraph 3. Accomplishment Instructions.
Group 1, Configuration 1, 3; Group 2, Configuration 1, 3; Group 3, Configuration 1, 3; Group 7, Config-
uration 1, 3:
Table 1: PART 2: INSPECTION for cracks of the Upper Frame to Side Frame Splice Above Stringer S-14
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 5,000
flight cycles af-
ter the effective
date of AD
2008-13-12.
Before 30,000
total flight cy-
cles.
Do PART 2: INSPEC-
TION for cracks.
Airplanes that have accom-
plished the preventative
modification in accordance
with Boeing Service Bul-
letin 737-53-1125 and have
not accomplished any in-
spection in accordance
with the original issue of
this service bulletin.
OR
Airplanes that have not ac-
complished Boeing Service
Bulletin 737-53-1125 and
have not accomplished any
inspection in accordance
with the original issue of
this service bulletin.
-Before Further Flight.Contact Boeing for In-
structions and accomplish
the instructions.
CONDITION 1: ANY
CRACK FOUND DURING
PART 2: INSPECTION
6,000 flight cycles.-Repeat PART 2: INSPEC-
TION for cracks.
CONDITION 2: NO
CRACK FOUND DURING
PART 2: INSPECTION
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
52 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 53

Group 1, Configuration 4-5; Group 2, Configuration 4-5; Group 3, Configuration 4-5; Group 7, Configu-
ration 4-5:
Table 2: PART 2: INSPECTION for cracks of the Upper Frame to Side Frame Splice Above Stringer S-14
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
-Within 6,000 flight cycles after the
last inspection accomplished in
accordance with the original issue
of this bulletin.
Do PART 2: INSPEC-
TION for cracks.
Airplanes that have accom-
plished the preventative
modification in accordance
with Boeing Service Bul-
letin 737-53-1125 and have
accomplished at least one
inspection in accordance
with the original issue of
this service bulletin.
OR
Airplanes that have not ac-
complished Boeing Service
Bulletin 737-53-1125 and
have accomplished at least
one inspection in accor-
dance with the original is-
sue of this service bulletin.
-Before Further Flight.Contact Boeing for In-
structions and accomplish
the instructions.
CONDITION 1: ANY
CRACK FOUND DURING
PART 2: INSPECTION
6,000 flight cycles.-Repeat PART 2: INSPEC-
TION for cracks.
CONDITION 2: NO
CRACK FOUND DURING
PART 2: INSPECTION
Group 1, Configuration 2, 6; Group 2, Configuration 2, 6; Group 3, Configuration 2, 6; Group 7,
Configuration 2, 6:
Contact Boeing to get instructions for the post-repair and post-modification requirements for this service
bulletin, and do the work instructed by Boeing within 120 days of the Revision 1 date of this service
bulletin.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
53 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 54

Group 4-6, 8-11, Configuration 1:
Table 3: PART 2: INSPECTION for cracks and PART 4: PREVENTATIVE MODIFICATION of the Upper
Frame to Side Frame Splice Above Stringer S-14
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 5,000
flight cycles af-
ter the effective
date of AD
2008-13-12.
Before 30,000
total flight cy-
cles.
Do PART 2: INSPEC-
TION for cracks. (b)
Airplanes that have accom-
plished the preventative
modification in accordance
with Boeing Service Bul-
letin 737-53-1125 and have
not accomplished any in-
spection in accordance
with the original issue of
this service bulletin.
AND
-Within 4,000
flight cycles af-
ter the Revision
1 date of this
service bulletin.
Before 57,000
total flight cy-
cles.
Do PART 4: PREVENTA-
TIVE MODIFICATION.
(a) (b)
-Before Further Flight.Contact Boeing to get in-
structions for the repair
and do the work instruct-
ed by Boeing.
CONDITION 3: ANY
CRACK FOUND DURING
PART 2: INSPECTION
6,000 flight cycles.
(b)
-Repeat PART 2: INSPEC-
TION for cracks until
PART 4: PREVENTA-
TIVE MODIFICATION is
accomplished.
CONDITION 4: NO
CRACK FOUND DURING
PART 2: INSPECTION
(a) Actions for the Conditions Found During the PART 4: PREVENTATIVE MODIFICATION are provided in
Table 10.
(b) Accomplishment of PART 4: PREVENTATIVE MODIFICATION is terminating action for the initial and
repeat PART 2: INSPECTION at the modified location only. PART 4: PREVENTATIVE MODIFICATION
can be accomplished at any time before the compliance time shown in this table. PART 6: POST-PRE-
VENTATIVE MODIFICATION INSPECTION is provided in Table 12.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
54 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 55

Group 4-6, 8-11, Configuration 2:
Table 4: PART 2: INSPECTION of the Upper Frame to Side Frame Splice Above Stringer S-14 for cracks
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 5,000
flight cycles af-
ter the effective
date of AD
2008-13-12.
Before 50,000
total flight cy-
cles.
Do PART 2: INSPEC-
TION to make sure the
existing frame repair
meets all requirements of
Revision 1 of this service
bulletin.
Airplanes that have accom-
plished the frame repair in
accordance with Boeing
Service Bulletin 737-53-
1125 and have not accom-
plished any inspection in
accordance with the origi-
nal issue of this service
bulletin.
-Before Further Flight.Contact Boeing with the
details of the frame repair
and do the work instruct-
ed by Boeing.
CONDITION 5: FRAME
REPAIR DOES NOT
MEET ALL REQUIRE-
MENTS OF REVISION 1
OF THIS SERVICE BUL-
LETIN
-Before Further Flight.Continue PART 2: IN-
SPECTION for cracks.
CONDITION 6: FRAME
REPAIR MEETS ALL RE-
QUIREMENTS OF REVI-
SION 1 OF THIS SERVICE
BULLETIN
-Before Further Flight.Contact Boeing to get in-
structions for the repair
and do the work instruct-
ed by Boeing.
CONDITION 7: ANY
CRACK FOUND DURING
PART: 2 INSPECTION
4,500 flight cycles.-Repeat PART 2: INSPEC-
TION for cracks.
CONDITION 8: NO
CRACK FOUND DURING
PART: 2 INSPECTION
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
55 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 56

Group 4-6, 8-11, Configuration 3:
Table 5: PART 2: INSPECTION for cracks and PART 4: PREVENTATIVE MODIFICATION of the Upper
Frame to Side Frame Splice Above Stringer S-14
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 5,000
flight cycles af-
ter the effective
date of the AD
2008-13-12.
Before 30,000
total flight cy-
cles.
Do PART 2: INSPEC-
TION for cracks. (c)
Airplanes that have not ac-
complished Boeing Service
Bulletin 737-53-1125 and
have not accomplished any
inspection in accordance
with the original issue of
this service bulletin. AND
-Within 4,000
flight cycles af-
ter the Revision
1 date of this
service bulletin.
Before 57,000
total flight cy-
cles.
Do PART 4: PREVENTA-
TIVE MODIFICATION.
(a) (c) (d)
-Before Further Flight.Do PART 3: REPAIR. (b)
(d)
CONDITION 9: ANY
CRACK FOUND DURING
PART 2: INSPECTION
6,000 flight cycles.
(c) (d)
-Repeat PART 2: INSPEC-
TION for cracks until
PART 4: PREVENTA-
TIVE MODIFICATION is
accomplished.
CONDITION 10: NO
CRACK FOUND DURING
PART 2: INSPECTION
(a) Actions for the Conditions Found During PART 4: PREVENTATIVE MODIFICATION are provided in
Table 11.
(b) Actions for the Conditions Found During PART 3: REPAIR are provided in Table 9.
(c) Accomplishment of PART 4: PREVENTATIVE MODIFICATION is terminating action for the initial and
repeat PART 2: INSPECTION at the modified location only. PART 4: PREVENTATIVE MODIFICATION
can be accomplished at any time before the compliance time shown in this table. PART 6: POST-PRE-
VENTATIVE MODIFICATION INSPECTION is provided in Table 12.
(d) Accomplishment of PART 3: REPAIR is terminating action for the repeat PART 2: INSPECTION and
PART 4: PREVENTATIVE MODIFICATION at the repaired location only. PART 7: POST-REPAIR IN-
SPECTION is provided in Table 14.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
56 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 57

Group 4-6, 8-11, Configuration 4:
Table 6: PART 2: INSPECTION for cracks and PART 4: PREVENTATIVE MODIFICATION of the Upper
Frame to Side Frame Splice Above Stringer S-14
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 6,000 flight cycles after the
last inspection accomplished in
accordance with the original issue
of this service bulletin.
Do PART 2: INSPEC-
TION for cracks. (b)
Airplanes that have accom-
plished the preventative
modification in accordance
with Boeing Service Bul-
letin 737-53-1125 and have
accomplished at least one
inspection in accordance
with the original issue of
this service bulletin.
AND
-Within 4,000
flight cycles af-
ter the Revision
1 date of this
service bulletin.
Before 57,000
total flight cy-
cles.
Do PART 4: PREVENTA-
TIVE MODIFICATION.
(a) (b)
-Before Further Flight.Contact Boeing to get in-
structions for the repair
and do the work instruct-
ed by Boeing.
CONDITION 3: ANY
CRACK FOUND DURING
PART 2: INSPECTION
6,000 flight cycles.
(b)
-Repeat PART 2: INSPEC-
TION for cracks until
PART 4: PREVENTA-
TIVE MODIFICATION is
accomplished.
CONDITION 4: NO
CRACK FOUND DURING
PART 2: INSPECTION
(a) Actions for the Conditions Found during PART 4: PREVENTATIVE MODIFICATION are provided in Table
10.
(b) Accomplishment of PART 4: PREVENTATIVE MODIFICATION is terminating action for the initial and
repeat PART 2: INSPECTION at the modified location only. PART 4: PREVENTATIVE MODIFICATION
can be accomplished at any time before the compliance time shown in this table. PART 6: POST-PRE-
VENTATIVE MODIFICATION INSPECTION is provided in Table 12.
Group 4-6, 8-11, Configuration 5:
Table 7: PART 2: INSPECTION of the Upper Frame to Side Frame Splice Above Stringer S-14 for cracks
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
-Within 6,000 flight cycles after the
last inspection accomplished in
accordance with the original issue
of this bulletin.
Do PART 2: INSPEC-
TION to make sure the
existing frame repair
meets all requirements of
Revision 1 of this service
bulletin.
Airplanes that have accom-
plished the frame repair in
accordance with Boeing
Service Bulletin 737-53-
1125 and have accom-
plished at least one inspec-
tion in accordance with the
original issue of this service
bulletin.
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
57 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 58

Group 4-6, 8-11, Configuration 5:
Table 7: PART 2: INSPECTION of the Upper Frame to Side Frame Splice Above Stringer S-14 for cracks
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
-Before Further Flight.Contact Boeing with the
details of the frame repair
and do the work instruct-
ed by Boeing.
CONDITION 5: FRAME
REPAIR DOES NOT
MEET ALL REQUIRE-
MENTS OF REVISION 1
OF THIS SERVICE BUL-
LETIN
-Before Further Flight.Continue PART 2: IN-
SPECTION for cracks.
CONDITION 6: FRAME
REPAIR MEETS ALL RE-
QUIREMENTS OF REVI-
SION 1 OF THIS SERVICE
BULLETIN
-Before Further Flight.Contact Boeing to get in-
structions for the repair
and do the work instruct-
ed by Boeing.
CONDITION 7: ANY
CRACK FOUND DURING
PART 2: INSPECTION
4,500 flight cycles.-Repeat PART 2: INSPEC-
TION for cracks.
CONDITION 8: NO
CRACK FOUND PART 2:
INSPECTION
Group 4-6, 8-11, Configuration 6:
Table 8: PART 2: INSPECTION for cracks and PART 4: PREVENTATIVE MODIFICATION of the Upper
Frame to Side Frame Splice Above Stringer S-14
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 6,000 flight cycles after the
last inspection accomplished in
accordance with the original issue
of this service bulletin.
Do PART 2: INSPEC-
TION for cracks. (c)
Airplanes that have not ac-
complished Boeing Service
Bulletin 737-53-1125 and
have accomplished at least
one inspection in accor-
dance with the original is-
sue of this service bulletin.
AND
-Within 4,000
flight cycles af-
ter the Revision
1 date of this
service bulletin.
Before 57,000
total flight cy-
cles.
Do PART 4: PREVENTA-
TIVE MODIFICATION.(a)
(c) (d)
-Before Further Flight.Do PART 3: REPAIR. (b)
(d)
CONDITION 9: ANY
CRACK FOUND DURING
PART 2: INSPECTION
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
58 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 59

Group 4-6, 8-11, Configuration 6:
Table 8: PART 2: INSPECTION for cracks and PART 4: PREVENTATIVE MODIFICATION of the Upper
Frame to Side Frame Splice Above Stringer S-14
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
6,000 flight cycles.
(c) (d)
-Repeat PART 2: INSPEC-
TION for cracks until
PART 4: PREVENTA-
TIVE MODIFICATION is
accomplished.
CONDITION 10: NO
CRACK FOUND DURING
PART 2: INSPECTION
(a) Actions for the Conditions Found During PART 4: PREVENTATIVE MODIFICATION are provided in
Table 11.
(b) Actions for the Conditions Found During PART 3: REPAIR are provided in Table 9.
(c) Accomplishment of PART 4: PREVENTATIVE MODIFICATION is terminating action for the initial and
repeat PART 2: INSPECTION at the modified location only. PART 4: PREVENTATIVE MODIFICATION
can be accomplished at any time before the compliance time shown in this table. PART 6: POST-PRE-
VENTATIVE MODIFICATION INSPECTION is provided in Table 12.
(d) Accomplishment of PART 3: REPAIR is terminating action for the repeat PART 2: INSPECTION and
PART 4: PREVENTATIVE MODIFICATION at the repaired location only. PART 7: POST-REPAIR IN-
SPECTION is provided in Table 14.
Group 4, Configuration 3, 6; Group 5, Configuration 3, 6; Group 6, Configuration 3, 6; Group 8, Config-
uration 3, 6; Group 9, Configuration 3, 6; Group 10, Configuration 3, 6; Group 11, Configuration 3, 6:
Table 9: Actions for the Conditions Found During PART 3: REPAIR
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
-Before Further Flight.Contact Boeing to get in-
structions for the repair
and do the work instruct-
ed by Boeing.
CONDITION 11: ANY
CRACK FOUND DURING
PART 3: REPAIR
-Before Further Flight.Continue PART 3: RE-
PAIR.
CONDITION 12: NO
CRACK FOUND DURING
PART 3: REPAIR
Group 4, Configuration 1, 4; Group 5, Configuration 1, 4; Group 6, Configuration 1, 4; Group 8, Config-
uration 1, 4; Group 9, Configuration 1, 4; Group 10, Configuration 1, 4; Group 11, Configuration 1, 4:
Table 10: Actions for the Conditions Found During PART 4: PREVENTATIVE MODIFICATION
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
-Before Further Flight.Contact Boeing to get in-
structions for the repair
and do the work instruct-
ed by Boeing.
CONDITION 13: ANY
CRACK FOUND DURING
PART 4: PREVENTATIVE
MODIFICATION
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
59 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

### Page 60

Group 4, Configuration 1, 4; Group 5, Configuration 1, 4; Group 6, Configuration 1, 4; Group 8, Config-
uration 1, 4; Group 9, Configuration 1, 4; Group 10, Configuration 1, 4; Group 11, Configuration 1, 4:
Table 10: Actions for the Conditions Found During PART 4: PREVENTATIVE MODIFICATION
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
-Before Further Flight.Continue PART 4: PRE-
VENTATIVE MODIFICA-
TION.
CONDITION 14: NO
CRACK FOUND DURING
PART 4: PREVENTATIVE
MODIFICATION
Group 4, Configuration 3, 6; Group 5, Configuration 3, 6; Group 6, Configuration 3, 6; Group 8, Config-
uration 3, 6; Group 9, Configuration 3, 6; Group 10, Configuration 3, 6; Group 11, Configuration 3, 6:
Table 11: Actions for the Conditions Found During PART 4: PREVENTATIVE MODIFICATION
Repeat Interval
(Not to Exceed)
Compliance TimeActionCondition
-Before Further Flight.Do PART 3: REPAIR.CONDITION 15: ANY
CRACK FOUND IN THE
UPPER FRAME ORIGI-
NATING FROM THE UP-
PER END FASTENER LO-
CATION OF THE FRAME
SPLICE, COMMON TO
THE FAIL SAFE CHORD
DURING PART 4: PRE-
VENTATIVE MODIFICA-
TION
-Before Further Flight.Contact Boeing to get in-
structions for the repair
and do the work instruct-
ed by Boeing.
CONDITION 16: ANY
OTHER CRACK FOUND
DURING PART 4: PRE-
VENTATIVE MODIFICA-
TION
-Before Further Flight.Continue PART 4: PRE-
VENTATIVE MODIFICA-
TION.
CONDITION 17: NO
CRACK FOUND DURING
PART 4: PREVENTATIVE
MODIFICATION
Export Controlled ECCN: 9E991 - BOEING
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.
Original Issue: January 19, 2006
737-53A1261Revision 1: January 30, 2015
60 of 622
BOEING SERVICE BULLETIN 737-53A1261
ALERTALERT

The text continues at https://openairdocs.org/service-documents/boeing/737-53a1261/file/cc923bee238c.md?from=61

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.