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Boeing ASB 737-57A1296: Revision 2

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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1296 Original Issue: June 13, 2007 Revision 2: April 01, 2015 ATA System: 5714 SUBJECT: WINGS - Center Wing Box - Longitudinal Floor Beams Between Body Station 656 and Body Station 727 - Inspection, Repair and Preventive 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 © 2007 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Unpublished Work.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: June 13, 2007 737-57A1296Revision 2: April 01, 2015 1 of 438

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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: June 13, 2007 737-57A1296Revision 2: April 01, 2015 2 of 438 BOEING SERVICE BULLETIN 737-57A1296

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Table of Contents

Revision Transmittal Sheet9

Summary ..................................................... 1 3

1. PLANNING INFORMATION ........................................ 1 7 A. Effectivity ............................................... 1 7

1. Airplanes ............................................ 1 7

2. Spares Affected ........................................ 2 9 B. Concurrent Requirements ...................................... 2 9 C. Reason ................................................ 2 9 D. Description .............................................. 3 0 E. Compliance .............................................. 3 2 F. Approval ............................................... 4 7 G. Manpower .............................................. 4 8 H. Weight and Balance Changes .................................... 5 6 I. Electrical Load Data ......................................... 5 7 J. References .............................................. 5 7

1. Existing Data: ......................................... 5 7

2. Data Supplied with this Service Bulletin: ........................... 5 8

3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 5 8 K. Publications Affected ........................................ 5 8 L. Interchangeability and Intermixability of Parts ........................... 5 8 M. Software Accomplishment Summary ................................ 5 9

2. MATERIAL INFORMATION ........................................ 6 1 A. Material - Price and Availability ................................... 6 1 B. Industry Support Information .................................... 6 1 C. Parts Necessary for Each Airplane ................................. 6 1

1. Kits/Parts: ........................................... 6 1

2. Parts and Materials Supplied by the Operator: ........................ 6 1

3. Parts Modified and Reidentified: ............................... 7 5

4. Parts Removed and Not Replaced: .............................. 7 6 D. Parts Necessary to Change Spares ................................. 7 6 E. Special Tooling - Price and Availability ............................... 7 6 F. Special Tooling Necessary to do this Service Bulletin ....................... 7 6

3. ACCOMPLISHMENT INSTRUCTIONS .................................. 7 7 A. GENERAL INFORMATION ..................................... 7 7 B. WORK INSTRUCTIONS ....................................... 7 9 FIGURE 1: CENTER WING BOX - LONGITUDINAL FLOOR BEAMS - ACCESS [Group 1-2, 4] .... 9 1 FIGURE 2: CENTER WING BOX - LONGITUDINAL FLOOR BEAMS - ACCESS [Group 3] ...... 9 2 FIGURE 3: CENTER WING BOX - LONGITUDINAL FLOOR BEAM UPPER CHORD INSPECTION AT RBL

24.82 AND LBL 24.82 BETWEEN STA 656 AND STA 685 [Group 3, Configuration 2] . . . 93 FIGURE 4: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB INSPECTION AT LBL 24.82 AND RBL 24.82 BETWEEN STA 705 AND STA 715 [Group 1-4, Configuration 2] ........ 9 7 FIGURE 5: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB INSPECTION AT LBL 45.57 AND RBL 45.57 BETWEEN STA 705 AND STA 715 [Group 1-4, Configuration 2] ....... 1 0 0 FIGURE 6: CENTER WING BOX - LONGITUDINAL FLOOR BEAM UPPER CHORD INSPECTION AT LBL

24.82 AND RBL 24.82, STA 727B [Group 1-4, Configuration 2] .............. 1 0 3 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: June 13, 2007 737-57A1296Revision 2: April 01, 2015 3 of 438 BOEING SERVICE BULLETIN 737-57A1296

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FIGURE 7: CENTER WING BOX - LONGITUDINAL FLOOR BEAM UPPER CHORD INSPECTION AT LBL

45.57 AND RBL 45.57, STA 727B [Group 1-4, Configuration 2] .............. 1 0 7 FIGURE 8: CENTER WING BOX - LONGITUDINAL FLOOR BEAM LOWER CHORD INSPECTION AT LBL 24.82 AND RBL 24.82 BETWEEN STA 660 AND STA 666 [Group 1, Configuration 2] . 111 FIGURE 9: CENTER WING BOX - LONGITUDINAL FLOOR BEAM LOWER CHORD INSPECTION AT LBL 24.82 AND RBL 24.82 BETWEEN STA 660 AND STA 666 [Group 2, 4, Configuration 2] ................................................. 1 1 6 FIGURE 10: CENTER WING BOX - LONGITUDINAL FLOOR BEAMS - CLOSE ACCESS [Group 1-2, 4] ................................................. 1 2 1 FIGURE 11: CENTER WING BOX - LONGITUDINAL FLOOR BEAMS - CLOSE ACCESS [Group 3] . 122 FIGURE 12: CENTER WING BOX - LONGITUDINAL FLOOR BEAM LOWER CHORD INSPECTION AT LBL 24.82 AND RBL 24.82 BETWEEN STA 660 AND STA 666 [Group 3, Configuration 2] . 123 FIGURE 13: CENTER WING BOX - REPAIR/PREVENTIVE MODIFICATION PARTS FOR THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT BL 24.82 AND STA 656 TO STA 685 [Group 3, Configuration 2] .................................. 1 2 8 FIGURE 14: CENTER WING BOX - LONGITUDINAL FLOOR BEAM UPPER CHORD REPAIR/PREVENTIVE MODIFICATION AT LBL 24.82 BETWEEN STA 656 AND STA 685 [Group 3, Configuration 2] ................................................. 1 3 2 FIGURE 15: CENTER WING BOX - LONGITUDINAL FLOOR BEAM UPPER CHORD REPAIR/PREVENTIVE MODIFICATION AT RBL 24.82 BETWEEN STA 656 AND STA 685 [Group 3, Configuration 2] ................................................. 1 3 9 FIGURE 16: CENTER WING BOX - REPAIR PARTS FOR THE LONGITUDINAL FLOOR BEAM WEB AT BL 24.82 AND BL 45.57 FROM STA 698 TO STA 717 [Group 1-4] ............ 1 4 6 FIGURE 17: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT LBL 24.82 FROM STA 698 TO STA 717 [Group 1-2, Configuration 2] ..................... 1 4 7 FIGURE 18: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT RBL 24.82 FROM STA 698 TO STA 717 [Group 1-2, Configuration 2] ..................... 1 5 4 FIGURE 19: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT LBL 24.82 FROM STA 698 TO STA 717 [Group 3, Configuration 2] ...................... 1 6 1 FIGURE 20: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT RBL 24.82 FROM STA 698 TO STA 717 [Group 3, Configuration 2] ...................... 1 6 8 FIGURE 21: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT LBL 24.82 FROM STA 698 TO STA 717 [Group 4, Configuration 2] ...................... 1 7 5 FIGURE 22: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT RBL 24.82 FROM STA 698 TO STA 717 [Group 4, Configuration 2] ...................... 1 8 2 FIGURE 23: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT LBL 45.57 FROM STA 698 TO STA 717 [Group 1-2, Configuration 2] ..................... 1 8 9 FIGURE 24: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT RBL 45.57 FROM STA 698 TO STA 717 [Group 1-2, Configuration 2] ..................... 1 9 6 FIGURE 25: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT LBL 45.57 FROM STA 698 TO STA 717 [Group 3-4, Configuration 2] ..................... 2 0 3 FIGURE 26: CENTER WING BOX - LONGITUDINAL FLOOR BEAM WEB REPAIR AT RBL 45.57 FROM STA 698 TO STA 717 [Group 3-4, Configuration 2] ..................... 2 1 0 FIGURE 27: CENTER WING BOX - REPAIR/PREVENTIVE MODIFICATION PARTS FOR THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT LBL 24.82, STA 727B [Group 1-4, Configuration 2] ..................................... 2 1 7 FIGURE 28: CENTER WING BOX - REPAIR OF THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT LBL 24.82, STA 727B [Group 1-4, Configuration 2] ......... 2 2 1 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: June 13, 2007 737-57A1296Revision 2: April 01, 2015 4 of 438 BOEING SERVICE BULLETIN 737-57A1296

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FIGURE 29: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT LBL 24.82, STA 727B [Group 1-4, Configuration 2] ........................................ 2 2 8 FIGURE 30: CENTER WING BOX - REPAIR/PREVENTIVE MODIFICATION PARTS FOR THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT RBL 24.82, STA 727B [Group 1-4, Configuration 2] ..................................... 2 3 4 FIGURE 31: CENTER WING BOX - REPAIR OF THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT RBL 24.82, STA 727B [Group 1-4, Configuration 2] ......... 2 3 8 FIGURE 32: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT RBL 24.82, STA 727B [Group 1-4, Configuration 2] ........................................ 2 4 5 FIGURE 33: CENTER WING BOX - REPAIR/PREVENTIVE MODIFICATION PARTS FOR THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT LBL 45.57, STA 727B [Group 1-4, Configuration 2] ..................................... 2 5 1 FIGURE 34: CENTER WING BOX - REPAIR OF THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT LBL 45.57, STA 727B [Group 1-4, Configuration 2] ......... 2 5 5 FIGURE 35: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT LBL 45.57, STA 727B [Group 1-4, Configuration 2] ........................................ 2 6 2 FIGURE 36: CENTER WING BOX - REPAIR/PREVENTIVE MODIFICATION PARTS FOR THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT RBL 45.57, STA 727B [Group 1-4, Configuration 2] ..................................... 2 6 8 FIGURE 37: CENTER WING BOX - REPAIR OF THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT RBL 45.57, STA 727B [Group 1-4, Configuration 2] ......... 2 7 2 FIGURE 38: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE AFT END OF THE LONGITUDINAL FLOOR BEAM UPPER CHORD AT RBL 45.57, STA 727B [Group 1-4, Configuration 2] ........................................ 2 7 9 FIGURE 39: CENTER WING BOX - PREVENTIVE MODIFICATION PARTS FOR THE LONGITUDINAL FLOOR BEAM WEB AT BL 24.82 AND BL 45.57 FROM STA 698 TO STA 717 [Group 1-4] ................................................. 2 8 5 FIGURE 40: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT LBL 24.82 FROM STA 698 TO STA 717 [Group 1-2, Configuration 2] . . 286 FIGURE 41: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT RBL 24.82 FROM STA 698 TO STA 717 [Group 1-2, Configuration 2] . 292 FIGURE 42: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT LBL 24.82 FROM STA 698 TO STA 717 [Group 3, Configuration 2] . . . 298 FIGURE 43: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT RBL 24.82 FROM STA 698 TO STA 717 [Group 3, Configuration 2] . . . 305 FIGURE 44: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT LBL 24.82 FROM STA 698 TO STA 717 [Group 4, Configuration 2] . . . 311 FIGURE 45: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT RBL 24.82 FROM STA 698 TO STA 717 [Group 4, Configuration 2] . . . 318 FIGURE 46: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT LBL 45.57 FROM STA 698 TO STA 717 [Group 1-2, Configuration 2] . . 325 FIGURE 47: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT RBL 45.57 FROM STA 698 TO STA 717 [Group 1-2, Configuration 2] . 331 FIGURE 48: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT LBL 45.57 FROM STA 698 TO STA 717 [Group 3-4, Configuration 2] . . 338 FIGURE 49: CENTER WING BOX - PREVENTIVE MODIFICATION OF THE LONGITUDINAL FLOOR BEAM ASSEMBLY AT RBL 45.57 FROM STA 698 TO STA 717 [Group 3-4, Configuration 2] . 345 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: June 13, 2007 737-57A1296Revision 2: April 01, 2015 5 of 438 BOEING SERVICE BULLETIN 737-57A1296

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FIGURE 50: CENTER WING BOX - LONGITUDINAL FLOOR BEAM TAPERED FILLER LOCATIONS AT LBL 24.82 AND LBL 45.57 [Group 1-4, Configuration 1] .................. 3 5 1 FIGURE 51: CENTER WING BOX - LONGITUDINAL FLOOR BEAM TAPERED FILLER LOCATIONS AT RBL 24.82 AND RBL 45.57 [Group 1-4, Configuration 1] .................. 3 5 3 FIGURE 52: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR AND PREVENTIVE MODIFICATION - REMOVAL AT LBL 24.82 AND LBL 45.57 FROM STA 698 TO STA 717 [Group 1-4, Configuration 1] ................................. 3 5 5 FIGURE 53: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR AND PREVENTIVE MODIFICATION - REMOVAL AT RBL 24.82 AND RBL 45.57 FROM STA 698 TO STA 717 [Group 1-4, Configuration 1] ................................. 3 5 7 FIGURE 54: CENTER WING BOX - LONGITUDINAL FLOOR BEAM TAPERED FILLER AREA INSPECTION AT LBL 24.82 AND LBL 45.57 FROM STA 698 TO STA 717 [Group 1-4, Configuration 1] . 359 FIGURE 55: CENTER WING BOX - LONGITUDINAL FLOOR BEAM TAPERED FILLER AREA INSPECTION AT RBL 24.82 AND RBL 45.57 FROM STA 698 TO STA 717 [Group 1-4, Configuration 1] . 362 FIGURE 56: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT LBL

24.82 FROM STA 698 TO STA 717 [Group 1-2, Configuration 1] ............. 3 6 5 FIGURE 57: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT RBL

24.82 FROM STA 698 TO STA 717 [Group 1-2, Configuration 1] ............. 3 6 8 FIGURE 58: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT LBL

24.82 FROM STA 698 TO STA 717 [Group 3, Configuration 1] .............. 3 7 1 FIGURE 59: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT RBL

24.82 FROM STA 698 TO STA 717 [Group 3, Configuration 1] .............. 3 7 5 FIGURE 60: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT LBL

24.82 FROM STA 698 TO STA 717 [Group 4, Configuration 1] .............. 3 7 8 FIGURE 61: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT RBL

24.82 FROM STA 698 TO STA 717 [Group 4, Configuration 1] .............. 3 8 1 FIGURE 62: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT LBL

45.57 FROM STA 698 TO STA 717 [Group 1-2, Configuration 1] ............. 3 8 4 FIGURE 63: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT RBL

45.57 FROM STA 698 TO STA 717 [Group 1-2, Configuration 1] ............. 3 8 7 FIGURE 64: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT LBL

45.57 FROM STA 698 TO STA 717 [Group 3, Configuration 1] .............. 3 9 0 FIGURE 65: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT RBL

45.57 FROM STA 698 TO STA 717 [Group 3, Configuration 1] .............. 3 9 3 FIGURE 66: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT LBL

45.57 FROM STA 698 TO STA 717 [Group 4, Configuration 1] .............. 3 9 6 FIGURE 67: CENTER WING BOX - LONGITUDINAL FLOOR BEAM REPAIR - INSTALLATION AT RBL

45.57 FROM STA 698 TO STA 717 [Group 4, Configuration 1] .............. 3 9 9 FIGURE 68: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT LBL 24.82 FROM STA 698 TO STA 717 [Group 1-2, Configuration 1] . 402 FIGURE 69: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT RBL 24.82 FROM STA 698 TO STA 717 [Group 1-2, Configuration 1] . 405 FIGURE 70: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT LBL 24.82 FROM STA 698 TO STA 717 [Group 3, Configuration 1] . 408 FIGURE 71: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT RBL 24.82 FROM STA 698 TO STA 717 [Group 3, Configuration 1] . 412 FIGURE 72: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT LBL 24.82 FROM STA 698 TO STA 717 [Group 4, Configuration 1] . 415 FIGURE 73: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT RBL 24.82 FROM STA 698 TO STA 717 [Group 4, Configuration 1] . 418 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: June 13, 2007 737-57A1296Revision 2: April 01, 2015 6 of 438 BOEING SERVICE BULLETIN 737-57A1296

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FIGURE 74: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT LBL 45.57 FROM STA 698 TO STA 717 [Group 1-2, Configuration 1] . 421 FIGURE 75: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT RBL 45.57 FROM STA 698 TO STA 717 [Group 1-2, Configuration 1] . 424 FIGURE 76: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT LBL 45.57 FROM STA 698 TO STA 717 [Group 3, Configuration 1] . 427 FIGURE 77: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT RBL 45.57 FROM STA 698 TO STA 717 [Group 3, Configuration 1] . 430 FIGURE 78: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT LBL 45.57 FROM STA 698 TO STA 717 [Group 4, Configuration 1] . 433 FIGURE 79: CENTER WING BOX - LONGITUDINAL FLOOR BEAM PREVENTIVE MODIFICATION - INSTALLATION AT RBL 45.57 FROM STA 698 TO STA 717 [Group 4, Configuration 1] . 436 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: June 13, 2007 737-57A1296Revision 2: April 01, 2015 7 of 438 BOEING SERVICE BULLETIN 737-57A1296

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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: June 13, 2007 737-57A1296Revision 2: April 01, 2015 8 of 438 BOEING SERVICE BULLETIN 737-57A1296

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Commercial Airplanes 737 Service Bulletin ALERT Revision Transmittal SheetNumber: 737-57A1296Original Issue: June 13, 2007 Revision 2: April 01, 2015 ATA System: 5714 SUBJECT: WINGS - Center Wing Box - Longitudinal Floor Beams Between Body Station 656 and Body Station 727 - Inspection, Repair and Preventive Modification This revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.

Federal Aviation Administration (FAA) Airworthiness Directives AD 2008-09-13, AD 2008-05-06 and AD 98-11-04 R1 are related to this service bulletin.

More work is necessary on the airplane(s) changed in accordance with Revision 1 of this service bulletin. For operators that did not install tapered fillers near STA 716 during the repair or the preventive modification done in accordance with Revision 1 of this service bulletin, install two tapered fillers on each longitudinal floor beam in accordance with Part 6 of the Work Instructions.

REASON FOR REVISION Revision 2 is sent to add instruction steps to install tapered fillers required for repairs or preventive modifications at STA 716, BL 24.82 and BL 45.57 inadvertently omitted from Revision 1 of this service bulletin. Omission of the tapered fillers creates a preload condition that may promote undetected fatigue cracking and subsequent failure of the BL 24.82 and BL 45.57 Longitudinal Floor Beams. Revision 2 elevates this service bulletin to an ALERT level status.

These sections were changed:

1. Changed Summary Background and Action sections.

2. Paragraph 1.A., Effectivity - Added Group/Configurations to provide instructions for operators that have or have not accomplished the prior issue of this service bulletin and have or have not installed a repair or preventive modification. Added Group 5.

3. Paragraph 1.C., Reason - Changed the Reason paragraph.

4. Paragraph 1.D., Description - Changed the Description paragraph. Added Group 5 to Affected Maintenance Zones.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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5. Paragraph 1.E., Compliance - Changed Tables 1-4 to provide corrective actions for "No Crack Found" conditions. Added Table 5 to provide compliance data for tapered filler inspections and corrective actions. Added Group 5 compliance data.

6. Paragraph 1.F., Approval - Changed the Approval paragraph.

7. Paragraph 1.G., Manpower - Changed manpower requirements.

8. Paragraph 1.H., Weight and Balance - Added Weight and Balance data for Group 1-4 Configuration 1 and Group 5.

9. Paragraph 1.J., References - Changed References.

10. Paragraph 2.C.2., Parts and Materials Supplied by the Operator - Changed fastener requirements for Group 1-4 Configuration 2 airplanes to accommodate tapered filler installation, clarified nutplate sizing, and added optional material thicknesses. Added Group 1-4 Configuration 1 and Group 5 material and requirements.

11. Paragraph 3.A. General Information - Changed General Notes.

12. Paragraph 3.B., Work Instructions - Changed Work Instructions PART 1-5. Added Work Instructions for Group 1-4 Configuration 1 and Group 5.

13. Figures 1 and 10, Changed step table.

14. Figure 16, Changed applicability.

15. Figures 3-7, 27, 30, 36, and 39, Changed applicability and step table.

16. Figures 8, 9, and 12, Changed applicability, step table, and fastener code table.

17. Figures 13, 25, 26, and 33, Changed applicability, illustrations, and step table.

18. Figures 14, 15, 17-24, 28, 29, 31, 32, 34, 35, 37, 38, and 40-49, Changed applicability, illustrations, step table, and fastener code table.

19. Added Figures 50-79.

The data given in Information Notice 737-57-1296 IN01 and IN02 and IN03 is included in this Revision.

737-57-1296 IN01 was sent to tell operators the correct instructions for inspecting Group 3 airplanes. 737-57-1296 IN02 was sent to provide additional information to operators including fastener pattern information, fastener quantity, clip-on nutplate, primer and enamel. 737-57-1296 IN03 was sent to provide information to operators about the tapered fillers.

The data given in Alternative Method of Compliance Notice 737-57-1296-AMOC-02 is included in this revision.

Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location of important changes.

Pages with no vertical lines have no important changes.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: June 13, 2007 737-57A1296Revision 2: April 01, 2015 10 of 438 BOEING SERVICE BULLETIN 737-57A1296

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REVISION HISTORY June 13, 2007Original Issue:

September 26, 2012Revision 1:

April 01, 2015Revision 2:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

Original Issue: June 13, 2007 737-57A1296Revision 2: April 01, 2015 11 of 438 BOEING SERVICE BULLETIN 737-57A1296

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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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