# Boeing Alert Service Bulletin 737-53A1210: U.S. DOT/FAA - Boeing Service Bulletin - Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2011-0155; AD 2013-18-08 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Boeing Alert Service Bulletin 737-53A1210](https://openairdocs.org/service-documents/boeing/737-53a1210.md) - Title as filed: U.S. DOT/FAA - Boeing Service Bulletin - Pages: 267 - PDF: https://openairdocs.org/files/sha256/44/bc/44bc3b719bae0e1c32cea7f91e60c7d64e335783a71ff04efb4055175b85254a - Page: https://openairdocs.org/service-documents/boeing/737-53a1210/file/44bc3b719bae ## Text Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 1 of 267 ALERT ALERT Commercial Airplanes 737 ALERTALERT Service Bulletin Number: 737-53A1210 Original Issue: December 14, 2000 Revision 3: July 16, 2009 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Fuselage Skin Chem-Mill Line Crack Inspection and Repair BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2000 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collective work. This document includes proprietary information owned by The Boeing Company and/or one or more third parties. Treatment of the document and the information it contains is governed by contract with Boeing. For more information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124. Boeing, 707, 717, 727, 737, 747, 757, 767, 777, BBJ, BOEING BUSINESS JET, DC-8, DC-9, DC-10, MD-10, MD-11, MD-80, MD-90, the Boeing logo and the Boeing livery are among the trademarks owned by Boeing or its subsidiaries. No intellectual property license (express or implied) is granted in connection with this document or otherwise. ### Page 2 BLANK PAGE Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 2 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT BLANK PAGE ### Page 3 Table of Contents Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 3 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT Table of Contents Revision Transmittal Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . 79 3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . 80 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . 80 2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . 81 3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . 84 3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 FIGURE 1: THIS FIGURE WAS DELETED AT REVISION 2 . . . . . . . . . . . . . . . . . . . . . . 105 FIGURE 2: THIS FIGURE WAS DELETED AT REVISION 2 . . . . . . . . . . . . . . . . . . . . . . 106 FIGURE 3: SKIN INSPECTIONS IN THE CROWN AREA AND OTHER AREAS OF KNOWN CRACKING 107 FIGURE 4: SKIN INSPECTIONS IN THE CROWN AREA AND OTHER AREAS OF KNOWN CRACKING 112 FIGURE 5: CROWN AREA SKIN INSPECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 FIGURE 6: CROWN AREA SKIN INSPECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 FIGURE 7: CROWN AREA SKIN INSPECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 FIGURE 8: THIS FIGURE WAS DELETED AT REVISION 2 . . . . . . . . . . . . . . . . . . . . . . 126 FIGURE 9: THIS FIGURE WAS DELETED AT REVISION 2 . . . . . . . . . . . . . . . . . . . . . . 127 ### Page 4 Table of Contents Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 4 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT FIGURE 10: PREVENTIVE MODIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 FIGURE 11: SKIN INSPECTIONS IN THE LOWER LOBE AREA AND IN SECTION 41 . . . . . . . 135 FIGURE 12: SKIN INSPECTIONS IN THE LOWER LOBE AREA AND IN SECTION 41 . . . . . . . 138 FIGURE 13: SKIN INSPECTIONS IN THE LOWER LOBE AREA AND IN SECTION 41 . . . . . . . 141 FIGURE 14: SKIN INSPECTIONS IN THE LOWER LOBE AREA . . . . . . . . . . . . . . . . . . . 144 FIGURE 15: SKIN INSPECTIONS IN THE LOWER LOBE AREA . . . . . . . . . . . . . . . . . . . 147 FIGURE 16: THIS FIGURE WAS DELETED AT REVISION 2 . . . . . . . . . . . . . . . . . . . . . 150 FIGURE 17: TIME-LIMITED SKIN REPAIR AT A LAP JOINT . . . . . . . . . . . . . . . . . . . . . 151 FIGURE 18: INSPECTION OF THE TIME-LIMITED SKIN REPAIR AT A LAP JOINT. . . . . . . . . 157 FIGURE 19: THIS FIGURE WAS DELETED AT REVISION 2 . . . . . . . . . . . . . . . . . . . . . 160 FIGURE 20: THIS FIGURE WAS DELETED AT REVISION 2 . . . . . . . . . . . . . . . . . . . . . 161 FIGURE 21: SECTION 41 - EXTERNAL INSPECTION BETWEEN STA 259.5 AND STA 360 - S-19R TO 24R AND S-4L TO S-4R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 FIGURE 22: SECTION 41 - EXTERNAL INSPECTION BETWEEN STA 259.5 AND STA 360 - S-24R TO S-24 L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 FIGURE 23: TEAR STRAP ATTACHMENT TO SKIN INSPECTION . . . . . . . . . . . . . . . . . 166 FIGURE 24: SKIN CHEM-MILL LINE CRACK AT STRINGER 12 - REPAIR . . . . . . . . . . . . . 168 FIGURE 25: INSPECTION FOR VERTICAL CRACKS AT CHEM-MILL LINES OF FUSELAGE SKIN 175 FIGURE 26: SKIN INSPECTION - LEFT AND RIGHT HAND SIDE BETWEEN STA 360 AND STA 540, STRINGER 14 - STRINGER 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179 FIGURE 27: SKIN INSPECTION - RIGHT HAND SIDE BETWEEN STA 360 AND STA 540, STRINGER 14 - STRINGER 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8 FIGURE 28: SECTION 41 - SKIN INSPECTION - STRINGER-18R AND STRINGER-19R BETWEEN STA 303 AND STA 320 AND STRINGER- 15R BETWEEN STA 344 AND STA 352 . . . . 196 FIGURE 29: SKIN INSPECTIONS IN THE LOWER LOBE AREA . . . . . . . . . . . . . . . . . . . 198 FIGURE 30: TYPICAL INTERNAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 FIGURE 31: SKIN INSPECTION - LEFT HAND SIDE BETWEEN STA 490 AND STA 500, STRINGER 17L 204 FIGURE 32: SKIN INSPECTION - LEFT HAND SIDE BETWEEN STA 727 AND STA 1016 . . . . . 206 FIGURE 33: SKIN INSPECTION - LEFT HAND SIDE BETWEEN STA 360 AND STA 540 AND STA 727 AND STA 1016 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8 FIGURE 34: SKIN INSPECTION - LEFT AND RIGHT SIDE BETWEEN STA 360 AND STA 540. . . 212 FIGURE 35: SKIN INSPECTION - LEFT AND RIGHT SIDE BETWEEN STA 727 AND 1016. . . . . 218 FIGURE 36: SKIN INSPECTION - LEFT SIDE BETWEEN STA 360 AND STA 540. . . . . . . . . . 222 FIGURE 37: SKIN INSPECTION - LEFT SIDE BETWEEN STA 360 AND STA 540. . . . . . . . . . 224 FIGURE 38: TIME LIMITED REPAIR - CHEM-MILL CRACKS - NOT LOCATED AT LAP JOINTS . . 226 FIGURE 39: INSPECTION FOR VERTICAL CRACKS AT CHEM-MILL LINES OF FUSELAGE SKIN 230 FIGURE 40: INSPECTION FOR VERTICAL CRACKS AT CHEM-MILL LINES OF FUSELAGE SKIN 234 FIGURE 41: SKIN INSPECTIONS IN THE LOWER LOBE AREA . . . . . . . . . . . . . . . . . . . 238 FIGURE 42: FUSELAGE WINDOW BELT AREA INSPECTION . . . . . . . . . . . . . . . . . . . . 241 FIGURE 43: FUSELAGE WINDOW BELT AREA INSPECTION . . . . . . . . . . . . . . . . . . . . 244 FIGURE 44: FUSELAGE WINDOW BELT AREA INSPECTION . . . . . . . . . . . . . . . . . . . . 248 FIGURE 45: CROWN AREA SKIN INSPECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 251 FIGURE 46: CROWN AREA SKIN INSPECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 254 FIGURE 47: INSPECTION FOR VERTICAL CRACKS AT CHEM-MILL LINES OF FUSELAGE SKIN 257 FIGURE 48: POST REPAIR INSPECTION - SKIN CHEM-MILL CRACK REPAIR AT STRINGER 12 261 FIGURE 49: INSPECTION FOR VERTICAL CRACKS AT CHEM-MILL LINES OF FUSELAGE SKIN 263 ### Page 5 Table of Contents Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 5 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT APPENDIX A: COST BENEFIT ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267 ### Page 6 Table of Contents Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 6 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT BLANK PAGE ### Page 7 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 267 ALERT ALERT Commercial Airplanes 737 ALERTALERT Service Bulletin Number: 737-53A1210 Revision Transmittal Sheet Original Issue: December 14, 2000 Revision 3: July 16, 2009 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Fuselage Skin Chem-Mill Line Crack Inspection and Repair This revision includes all pages of the service bulletin. COMPLIANCE INFORMATION RELATED TO THIS REVISION No more work is necessary on airplanes inspected as shown in Revision 2 of this service bulletin. More work is necessary on airplanes inspected as shown in the original issue or revision 1 of this service bulletin. Additional areas have been identified to be inspected for vertical and horizontal chem-mill line cracks. Inspection areas are clearly identified to facilitate compliance. Airplanes PM551-PM557, PM559-PM563, PW037-PW050, PW052-PW054, PW094, PW106, PW156-PW157, PW261, PW265-PW268, PW281, PW293, PW296, PW504, PW519-PW520, PW526, PW536-PW545, PW556, PW564, PW575-PW576, PW595-PW596, PW616, PW633-PW634, PW662, PW681-PW683, PW701-PW702, PW711-PW717, PW741-PW742, PW761, PW771 are added to Group 16 of this service bulletin effectivity. REASON FOR REVISION This revision is sent to add 737-400 airplanes to this service bulletin effectivity that were incorrectly removed in revision 2 of this service bulletin. Changes to this service bulletin include: - — Paragraph 1.A., Effectivity: Airplanes PM551-PM557, PM559-PM563, PW037-PW050, PW052-PW054, PW094, PW106, PW156-PW157, PW261, PW265-PW268, PW281, PW293, PW296, PW504, PW519- PW520, PW526, PW536-PW545, PW556, PW564, PW575-PW576, PW595-PW596, PW616, PW633- PW634, PW662, PW681-PW683, PW701-PW702, PW711-PW717, PW741-PW742, PW761, PW771 are added to the Group 16 effectivity. — Summary Compliance: FAA Airworthiness Directive is added. — Paragraph 1.E.,Compliance: FAA Airworthiness Directive is added. Compliance information and SRM reference is updated. Damage tolerance based structural inspection statement is moved to Paragraph 1.K. Publications Affected. — Paragraph 1.F., Approval: Approval information is updated. — Paragraph 1.G., Manpower: Manpower tables for Group 6, Group 7 and Group 8 is updated. — Paragraph 1.H.,Weight and Balance Changes: Weight and balance information is updated. — Paragraph 1.J., References, 1. Existing Data: FAA Airworthiness Directive is added and SRM reference is updated. ### Page 8 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 8 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT — Paragraph 2.C.2. Parts and Material Supplied by the Operator: Brackets are added to the ends of fastener part numbers. — Paragraph 3.B., Work Instructions, 1 Part 1, 5 Part 5 and 6 Part 6: SRM reference is updated. — Paragraph 3.B., Work Instructions, 6 Part 6 a.,(1),(a),4),{d}: A note is added to clarify staggered fasteners locations common to the time limited repair. — FIGURE 17 and FIGURE 18: The fastener pattern has been changed to stagger fasteners common to the tear strap. — FIGURE 24: Brackets are added to the ends of fastener part numbers and SRM reference is updated. — FIGURE 35: A new inspection area is added. Paragraph 1.A., Effectivity, shows changes of airplane operators. Each operator should examine the Effectivity paragraph for changes. 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. REVISION HISTORY Original Issue: December 14, 2000 Revision 1: October 25, 2001 Revision 2: March 3, 2009 Revision 3: July 16, 2009 ### Page 9 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9 of 267 ALERT ALERT Commercial Airplanes 737 ALERTALERT Service Bulletin Number: 737-53A1210 Summary Original Issue: December 14, 2000 Revision 3: July 16, 2009 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Fuselage Skin Chem-Mill Line Crack Inspection and Repair 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 Accomplishment of the inspections, modifications and repairs given in this service bulletin will ensure that fuselage skin cracks at chem-mill lines are found and repaired. This action is necessary to find and fix fatigue cracking of the skin panels which could result in sudden fracture and failure of the skin panels of the fuselage, and consequent rapid decompression of the airplane. Operators have reported horizontal cracks along the edges of the chem-milled pockets in the skin at S-12 in the bay forward of body station STA 520 and just above the S-4, S-10, and S-14 lap joints. Operators have reported 37 horizontal chem-mill line cracks of the fuselage crown skin at non-lap-joint areas. Skin inspection maps as given in this service bulletin present areas that need to be inspected for crown chem-mill line cracks. Fuselage skin cracks at tear strap attachments to the fuselage skin have also been reported by some operators. The chem-mill cracks were up to 8 inches long, and on at least 4 of the airplanes multiple adjacent bays were found to be cracked along the same stringer. These airplanes had flown 23,425 to 64,420 flight-cycles. Operators have reported numerous horizontal skin cracks along the edges of the chem-milled pockets in the skin below S-14, and section 41. The cracks were up to 7.25 inches long. These airplanes had flown 22,786 - 80,113 flight-cycles. Operators have also reported 13 circumferential cracks along the vertical chem-mill steps of the fuselage skin next to the STA 360, STA 727 and STA 908 Butt-Joints. The most critical situation was four in-line cracks in multiple adjacent bays on the aft side of the STA 908 butt joint from S-3R to S-7R. Crack lengths varied from 0.75 inch to 4 inches. These airplanes had flown 45,100 flight cycles (65,200 flight hours) to 67,400 flight cycles (70,800 flight hours). ### Page 10 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 10 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT Analysis by Boeing indicates that these cracks are caused by fatigue due to tension stresses plus local bending stresses at the edge of chem-milled pockets or bonded skin doublers. Boeing did a cost benefit analysis on the changes given in this service bulletin. Refer to Appendix A for the analysis. Boeing Service Related Problem (SRP) 737-SRP-53-0281 is related to this service bulletin. ACTION On all affected airplanes, do a detailed inspection and eddy current inspection of the fuselage skin for cracks at S-12 in the bay forward of STA 520, just above the S-4, S-10, and S-14 lap joints from STA 360 to STA 1016, at S-15 between STA 360 and STA 540, aft of STA 727 and other locations of known cracking identified in this service bulletin. Skin inspection maps as given in this service bulletin indicate additional areas that need to be inspected for possible signs of chem-mill line cracks at the fuselage crown. On all affected airplanes, do a High Frequency Eddy current (HFEC) Sliding Probe inspection of the tear strap attachments to the fuselage skin for signs of cracks at the locations as given in this service bulletin. On all affected airplanes, do detailed inspection of the crown area skins from S-10L to S-10R between STA 360 and STA 1016 for indications of horizontal chem-mill line cracks. On all affected airplanes, do a detailed inspection of the lower lobe skins for cracks from S-14L to S-14R, between STA 360 and STA 1016 and in Section 41 as given in this service bulletin. Skin inspection maps as given in this service bulletin indicate additional areas that need to be inspected for possible signs of chem-mill line cracks at the fuselage lower lobe and section 41. Also, on all affected airplanes do a detailed inspection and eddy current inspections of the fuselage crown skin (from S-10L to S-10R) for vertical cracks just forward and aft of STA 360, STA 500C, STA 540, STA 727, STA 727G, and STA 908, as applicable depending on the model, along the chem-mill lines as provided in this Service Bulletin. If any crack is found, repair as given in this service bulletin, or contact Boeing for repair instructions and install the repair. EFFECTIVITY 737-200, -200C, -300, -400, and -500 series airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes. COMPLIANCE Federal Aviation Administration (FAA) Airworthiness Directive 2004-18-06 and 98-11-04 R1 are related to this service bulletin. See Service Bulletin Paragraph 1.E. for compliance information. INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection and repair procedures given in this service bulletin. MANPOWER Refer to Paragraph 1.G., Manpower. ### Page 11 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 11 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT MATERIAL INFORMATION Operator Supplied Parts/Materials. Refer to Paragraph 2.A., Material - Price and Availability. DO DETAILED INSPECTIONS OF THE LOWER LOBE SKINS BELOW S-14 FROM STA 360 TO STA 1016 AND SECTION 41 FOR CRACKS. ALSO DO DETAILED INSPECTIONS OF THE UPPER LOBE SKINS ABOVE S-10 BETWEEN STA 360 AND STA 1016. IF ANY CRACK IS FOUND, REPAIR AS GIVEN IN THIS SERVICE BULLETIN, OR CONTACT BOEING FOR REPAIR INSTRUCTIONS AND INSTALL THE REPAIR. DO DETAILED INSPECTION AND EDDY CURRENT INSPECTION FOR CRACKS JUST ABOVE S-4, S-10 AND S-14 BETWEEN STA 360 TO STA 1016 AND ALONG THE CHEM-MILL LINES AT S-12, BETWEEN STA 500D TO STA 520 FOR 737-300, STA 482B TO 520 FOR 737-500, AND STA 500E TO 520 FOR 737-400. ALSO IN THE CROWN BETWEEN S-10L AND S-10R, AND AT S-15 BETWEEN STA 360 AND STA 540 AND AFT OF STA 727. IF ANY CRACK IS FOUND, REPAIR AS GIVEN IN THIS SERVICE BULLETIN, OR CONTACT BOEING FOR REPAIR INSTRUCTIONS AND INSTALL THE REPAIR. ADDITIONAL INSPECTION MAPS ARE GIVEN IN THE SERVICE BULLETIN. S-4L S-10L S-14L S-15L STA 360 STA 540 STA 727 STA 908 STA 1016 STA 259.5 LEFT SIDE SHOWN RIGHT SIDE OPPOSITE 737-400 SHOWN, OTHER MODELS ARE SIMILAR V21666 ### Page 12 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 12 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT S-10R STA 360 STA 540 STA 727 STA 908 STA 500C STA 727G 737-400 SHOWN OTHER MODELS ARE SIMILAR DO EDDY CURRENT INSPECTIONS OF THE FUSELAGE SKIN FOR VERTICAL CRACKS ALONG THE CHEM-MILL LINES AT THE BUTT JOINT AND OTHER LOCATIONS GIVEN IN THIS SERVICE BULLETIN. IF ANY CRACK IS FOUND, REPAIR AS GIVEN IN THIS SERVICE BULLETIN, OR CONTACT BOEING FOR REPAIR INSTRUCTIONS AND INSTALL THE REPAIR. 1522051 ### Page 13 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 13 of 267 ALERT ALERT Commercial Airplanes 737 ALERTALERT Service Bulletin Number: 737-53A1210 Original Issue: December 14, 2000 Revision 3: July 16, 2009 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Fuselage Skin Chem-Mill Line Crack Inspection and Repair 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 Refer to Service Bulletin Index Document D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data. This service bulletin is for the airplanes shown below. GROUP CONFIGURATION DESCRIPTION 1 - 737-200C Airplanes line numbers 294 through 1113. 2 - 737-200 Airplanes line numbers 292 through 1426 with a different Section 41 solid / bonded skin configuration to Group 13. 3 - 737-300 Airplanes line numbers 1001 through 1446 with a different Section 41 solid / bonded skin configuration to Groups 6, 9, 10, 14 and 15. 4 - 737-400 Airplanes line numbers 1487 through 1922 with a different Section 41 solid / bonded skin configuration to Groups 7, 11 and 16. 5 - 737-500 Airplanes line numbers 1718 through 1921 with a different Section 41 solid / bonded skin configuration to Groups 8, 12 and 17 excluding airplane variable numbers PU001- PU007. ### Page 14 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 14 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT 6 - 737-300 Airplanes line numbers 2554 through 2565 that do not require inspections for horizontal chem-mill cracks in the crown area between STA 360 and STA 1016. 7 - 737-400 Airplanes line numbers 2560 through 2564 that do not require inspections for horizontal chem-mill cracks in the crown area between STA 360 and STA 1016. 8 - 737-500 Airplane line number 2553 that does not require inspections for horizontal chem-mill cracks in the crown area between STA 360 and STA 1016. 9 - 737-300 Airplanes line numbers 1955 through 2495 with a different Section 41 solid / bonded skin configuration to Groups 3 and 14 and differences in areas in which inspections can be terminated by SB 737-53A1177. Excluding PP151-PP160 and PS751-PS756. 10 - 737-300 Airplanes line numbers 2497 through 2550 with a different Section 41 solid / bonded skin configuration to Groups 3 and 14 and differences in areas in which inspections can be terminated by SB 737-53A1177. Excluding PS757-PS762. 11 - 737-400 Airplanes line numbers 2501 through 2551 with a different Section 41 solid / bonded skin configuration to Group 4 and differences in areas in which inspections can be terminated by SB 737-53A1177. 12 - 737-500 Airplanes line numbers 2498 through 2552 with a different Section 41 solid / bonded skin configuration to Group 5 and differences in areas in which inspections can be terminated by SB 737-53A1177. 13 - 737-200 Airplanes line numbers 1453 through 1585 with a different Section 41 solid / bonded skin configuration to Group 2. 14 - 737-300 Airplanes line numbers 1447 through 1920 with a different Section 41 solid / bonded skin configuration to Groups 3, 6, 9, 10, and 15. Excluding PP127-PP148. 15 - 737-300 Airplanes line numbers 1924 through 1953 with a different Section 41 solid / bonded skin configuration to Groups 3 and 14 and differences in areas in which inspections can be terminated by SB 737-53A1177. Excluding PP149-PP150. GROUP CONFIGURATION DESCRIPTION ### Page 15 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 15 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT Airplane models: 737-200 737-200C 737-300 737-400 737-500 IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER A.P.S. TRADING SERV S.R.L (PSV) 2 PL019 AAM (VMA) 14 PQ192 9P Q 2 3 7 AAR AIRCRAFT SALES & LEASING (AFD) 14 PQ116 AEGEAN AIRLINES S.A. (CRM) 16 PW046 PW053 PW157 PW261 PW564 4P W 0 0 2 9P S 6 0 8 AERGO CAPITAL LIMITED (CLJ) 2 PK909 PK912 PK922 16 - 737-400 Airplanes line numbers 1931 through 2496 with a different Section 41 solid / bonded skin configuration to Group 4 and differences in areas in which inspections can be terminated by SB 737-53A1177. 17 - 737-500 Airplanes line numbers 1923 through 2494 with a different Section 41 solid / bonded skin configuration to Group 5 and differences in areas in which inspections can be terminated by SB 737-53A1177. Excluding PU008-PU025. 18 - 737-300 Airplane Variable Numbers PP149- PP160 and PS751-PS762 - Airplanes with no chem-milled skin panels in certain areas of the crown. 19 - 737-500 Airplane Variable Numbers PU001- PU007 - Airplanes with no chem-milled skin panels in certain areas of the crown. 20 - 737-500 Airplane Variable Numbers PU008- PU025 - Airplanes with no chem-milled skin panels in certain areas of the crown. 21 - 737-300 Airplane Variable Numbers PP127- PP148 - Airplanes with no chem-milled skin panels in certain areas of the crown. GROUP CONFIGURATION DESCRIPTION ### Page 16 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 16 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT AERO CONTRACTORS OF NIGERIA (NCC) 14 PQ194 PQ196 16 PV041 17 PT396 PT401 PT420–PT421 PT430–PT431 PT433 4 PV031 AERO NORTH INTERNATIONAL (NIN) 17 PT125 AEROFLOT - CARGO (CGB) 3 PP825–PP826 AEROFLOT-DON (DAU) 17 PT507–PT508 PT701–PT703 AEROFLOT-NORD (CJS) 12 PT028 17 PT009 PT027 PT050–PT051 PT054 PT056–PT057 PT147–PT148 PT183–PT184 5 PT021–PT022 PT182 PT295 AEROGAL/GALAPAGOS AIRLINES (ERG) 14 PQ226 PQ243 2 PK715 PK827 PL102 PL110 PL171 PL624–PL625 PN030 PN405 3 PP946 AEROLINEA PRINCIPAL (APW) 2 PK775 AEROLINEAS ARGENTINAS (ARG) 12 PT304–PT306 17 PT042 PT044–PT045 PT047 PT102 PT220 PT303 PT509–PT510 2 PG584–PG585 PK102–PK103 PK735–PK737 PK740 PK747 PK750–PK751 PK755 PK757 PK761 PK765 PN104 PN110–PN115 PN117 5 PT023 PT101 PT212 PT214 AEROLINEAS AUSTRAL CHILE S.A. (LUT) 2 PK745 PL405 PM141–PM142 PN103 AEROSERVICE (SRI) 2 PL742–PL743 AEROSUCRE (SUS) 1 PY201 PY451 AEROSUR (REO) 2 PK495 PK594 PK713–PK714 PK716 ### Page 17 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 17 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT AEROSVIT (UKA) 14 PP924 PQ284 PQ286 16 PW039 PW265 PW268 PW595–PW596 17 PT614–PT615 2P K 5 6 4 4 PW591–PW592 AEROTECNIC, LLC (TCQ) 2 PM054 AEROVISTA GULF EXPRESS (GXP) 1P Y 6 2 1 2 PK861–PK862 AIR ALGERIE (ALG) 1P Y 0 5 1 P Y 0 5 3 2 PK633–PK634 PL722 PL724 AIR AUSTRAL (AUX) 17 PT215 AIR CANADA (ACN) 2 PK679–PK680 AIR CARRIER ACCESSORY SERVICE (RCY) 2 PN085 AIR CHINA (BEJ) 9 PQ361 PQ363–PQ364 AIR CHINA INNER MONGOLIAN (IML) 9 PQ365–PQ366 PS614–PS616 AIR CHINA SOUTHWEST BRANCH (XIN) 3 PP632–PP633 6P Q 4 0 8 9 PQ402–PQ406 AIR CHINA TIANJIN BRANCH (TJA) 9 PQ367–PQ369 AIR CORRIDOR (KRD) 2P K 4 6 8 P K 7 4 9 AIR DOMINICANA (DMA) 3P P 8 9 4 AIR GUINEE (GNE) 1P Y 6 5 1 AIR INDIA (IND) 1P Y 6 3 1 2 PK237–PK240 PM001–PM006 ### Page 18 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 18 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT AIR INUIT (AIU) 1 PY243 AIR ITALY (RIT) 14 PP393 3 PP903 AIR MADAGASCAR (MAD) 14 PP852 AIR MALAWI (AML) 17 PT397 9 PS602 AIR NAMIBIA (NAM) 17 PT503–PT504 AIR NIPPON (ANK) 12 PT060 PT063 17 PT053 8P T 0 6 4 AIR NORTH YUKON'S AIRLINE (AND) 1 PY592 2 PK596 PK599 AIR ONE (ADH) 14 PQ228–PQ229 16 PV232–PV234 PV236–PV237 PW041 PW043 PW052 PW054 2 PK432 PK933 PK938 AIR PHILIPPINES (PHP) 2 PK099 PK542 PN021 PN025 PN029 PN031 PN038 PN417–PN418 AIR SLOVAKIA (SLO) 2 PK936 3 PP851 PP866 PP868–PP869 AIR TANZANIA (TNZ) 2P N 4 1 3 AIR ZIMBABWE (ZMB) 2 PN431–PN433 AIRASIA BERHAD (ASW) 14 PM385 PQ184 PQ332 3 PP002 PP021 PP407–PP409 PP471 9 PM397 AIRBALTIC CORPORATION (BCB) 17 PT005 PT161–PT163 PT424–PT425 PT428–PT429 ### Page 19 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 19 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT AIRCOMPANY TATARSTAN (TTQ) 17 PT170 AIRCRAFT MAINTENANCE CORP. (AMF) 2P K 2 5 4 AIRFAST INDONESIA (PTF) 2 PN481 AIRLINE CAPITAL LEASING, INC. (VTI) 2P J 0 0 9 AIRTRAN AIRWAYS (CQT) 2P K 6 9 7 AIRWORK NZ (ANX) 1P Y 7 4 1 14 PP039–PP040 PQ242 3P P 0 2 8 ALASKA AIRLINES (ASA) 11 PW241–PW242 16 PJ301–PJ302 PW231–PW240 4P W 1 1 6 7P W 2 4 5 ALOHA AIR CARGO (HLH) 1 PY131 PY463 PY593–PY594 PY721 ALTER BAIL AVIATION (ABH) 2P K 2 1 5 P K 3 5 9 AMERICAN FALCON AIR (FAK) 2 PL026 AMERISTAR AIR CARGO (CGG) 2 PK221 PK560 PM051 APOLLO AVIATION GROUP LLC (APV) 3 PP234 PP419 PP421 PP905 PP981–PP982 ARIK AIR (AKD) 14 PQ154 PQ161 ASIA AIRLINES (YDO) 1P Y 1 3 5 2 PL020 ASIANA AIRLINES (AAR) 7P W 2 8 3 ### Page 20 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 20 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT ASTRAEUS, LTD. (AUA) 9 PP929 PS605 ATLANT-SOYUZ (AYZ) 14 PP967 3 PP233 PP239 ATLANTIC AIRLINES (LNL) 2 PK673 PL008 PL622–PL623 ATLANTIC AIRLINES LTD (YDG) 14 PQ119 ATLAS BLUE (ABT) 16 PW633–PW634 17 PT581 4 PW631–PW632 AURELA (URE) 14 PQ233 9P Q 3 0 7 AURORA AVIATION (AGX) 14 PP199 PQ141–PQ142 PS666–PS667 15 PQ287 3 PP420 AUTOMATIC LLC (AUM) 2 PK759–PK760 PK764 AVE.COM (PHX) 2 PK213 PK823 PK826 PM252 3 PP892 AVIACSA AEROEXO (AEJ) 14 PP425 2 PK211 PK216–PK219 PK598 PK609 PK625–PK626 PM101–PM102 PM104–PM107 PM114–PM119 PM181 PN401–PN404 3 PP422–PP423 AVIOGENEX (AVG) 2P N 5 0 1 AVIOR (AWD) 2 PK549 PK591 PM052 PM058 PN133–PN134 PN137 PN139 PN144 PN147–PN148 PN153 PN159 AVSTAR (VSV) 2 PK355 PL111 ### Page 21 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 21 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT AWAS (AWW) 14 PP911–PP912 17 PT216 5P T 2 1 3 6P Q 4 7 3 BABCOCK & BROWN A/C MANAGEMENT (BBB) 3P P 8 4 8 BAHAMASAIR (BAH) 2 PL501 PL506 BASIC CAPITAL MANAGEMENT (BCM) 2 PN455 BATAVIA AIR (BTV) 11 PV203 14 PP917 PP921 16 PW156 PW575 2 PJ107 PJ112 PK252 PK283–PK284 PK305 PK360 PK514–PK515 PK563 PK617 PK622 PK635 PK711–PK712 PK825 PL413 3 PP003–PP004 PP006 PP008 PP017–PP020 PP406 4 PW005 PW015 PW020 PW032 9P S 6 3 1 BAVARIA (BAV) 14 PP984 BAYU INDONESIA AIR (BAY) 2P K 5 6 1 BCI AIRCRAFT LEASING (BLI) 1 PY112 PY134 PY462 2 PN131 PN136 PN138 PN142–PN143 3 PP231–PP232 PP237–PP238 PP679 PP682 BELAVIA (ITU) 10 PQ472 BELLVIEW AIRLINES (BEB) 2 PK203 PK612 PK872 PL028 BLUE AIR (BTR) 14 PQ160 16 PW741 3P Q 0 2 6 BLUE DART AVIATION (BDA) 13 PN521 2 PK231–PK232 PL451 PM281 ### Page 22 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 22 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT BLUE PANORAMA AIRLINES (BPA) 16 PW519 4P W 5 1 8 7P W 2 8 4 BLUEBIRD CARGO (BLS) 14 PM383 4P W 0 0 1 9 PQ342–PQ344 BMI BRITISH MIDLAND (BMA) 17 PT186–PT187 9P Q 2 9 2 BOA (BOV) 14 PQ304 9 PS604 BOEING CAPITAL CORPORATION (ZMF) 3 PP162 9P Q 7 9 2 BOURAQ AIRLINES (PTB) 2 PK501 PK913 PK918–PK920 PK931 BRANSON AIR (PTY) LTD (BSL) 2 PK874 PL025 BRITISH AIRWAYS (BAB) 11 PW324–PW327 14 PP841–PP842 PQ283 PQ305 16 PW301–PW302 PW305–PW308 PW312 PW314–PW315 PW317–PW323 9 PM399 BRUSSELS AIRLINES (EBA) 4 PW013 PW571–PW572 9 PS656 BULGARIA AIR (BLD) 12 PT437 14 PQ087 PQ190 PQ331 17 PT427 3 PP503 PQ086 5P T 2 1 1 9P Q 2 6 2 BURAQ AIR (BQA) 2 PL723 PL725 ### Page 23 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 23 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT C.I.T. LEASING CORPORATION (TCI) 14 PQ231 3P P 8 3 6 4P W 5 6 2 CANADIAN NORTH (ANP) 1 PY152–PY154 PY422 PY441 2 PK681 PL415 PN132 PN492 CAPITAL AIRCRAFT (CPT) 2P K 4 6 4 CAPITAL AIRWAYS LLC (CPY) 3P P 4 0 4 CARDIG AIR (CGD) 3 PP241–PP242 CARGO AIR (CGE) 3P P 4 1 0 CASBAH AG AVIATION DIVISION (BHV) 2 PL581 CAYMAN AIRWAYS (CAY) 1P Y 2 4 4 2P K 7 5 3 9 PQ293 PQ481 CELTIC CAPITAL (IAQ) 2 PN411 CENTRALWINGS (CLW) 16 PW106 PW267 CHANCHANGI AIRLINES (CGI) 2 PL412 PL416–PL417 PN083–PN084 PN086 9 PQ362 PQ401 CHILEAN AIR FORCE (CHF) 3P Q 0 5 3 CHINA EASTERN AIRLINES (CEA) 9 PQ263 PQ411–PQ412 CHINA EASTERN AIRLINES WUHAN (WUH) 9P Q 4 9 2 CHINA POSTAL AIRLINES (YIH) 10 PQ471 9 PM407–PM409 PQ295–PQ296 PQ493 ### Page 24 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 24 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT CHINA SOUTHERN AIRLINES (GUN) 10 PM542 PQ407 PQ479–PQ480 12 PT061–PT062 14 PQ252–PQ255 6 PM543–PM544 PM547 9 PM412 PM541 CHINA UNITED AIRLINES (CUL) 14 PP728–PP729 9 PS609–PS610 CHINA XINHUA AIRLINES (XIH) 10 PQ804–PQ805 6 PM546 9P Q 2 6 4 CHINA XINJIANG AIRLINES (XIJ) 6 PM545 CIRRUS ME S.A.L (CMU) 2 PM103 CITYLINE HUNGARY LTD. (CTZ) 1 PY101 COMAIR LIMITED (CML) 14 PP915 PP923 16 PW118 PW215–PW216 PW303 PW310–PW311 PW556 2 PK734 PK738 PK744 PK748 PK754 PK758 3 PQ001 PQ003–PQ006 PQ008 PQ010 4 PW111–PW112 PW115 CONOCOPHILLIPS ALASKA, INC. (ATR) 2 PN452–PN453 CONTINENTAL AIRLINES (CAL) 14 PP721–PP726 PP730 PP732–PP733 3 PP671–PP675 PP678 PP680–PP681 PP683 PP688–PP699 PP701 PP703–PP710 PP712–PP720 CONVIASA S.A. (VSS) 14 PP198 PQ117 PS668 2 PL005 PL010 PN154–PN155 CORENDON AIRLINES (HVA) 16 PM557 7P W 2 8 2 ### Page 25 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 25 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT CSA (CSA) 16 PW304 PW309 17 PT617–PT621 4P W 5 1 7 CSC TRANSPORT (CTC) 4P W 0 0 7 DAIMLERCHRYSLER AVIATION (DCY) 3 PP119–PP120 DBA (DBA) 9 PP511 PP515 PS655 DELMUN AVIATION SERVICES (DLM) 2P K 3 1 8 DELTA AIR LINES (DAL) 2 PN149 PN161 PN415 3P P 2 4 0 P P 2 4 3 DELTA CONNECTION (DTC) 1P Y 2 7 2 DNIPROAVIA (DNE) 14 PP510 17 PT041 4P W 0 3 1 DOLPHIN AIR (FDN) 1P Y 2 4 1 2 PL151 DONGHAI AIRLINES (JWC) 3 PP651–PP652 9 PM396 PM405 EASTOK AVIA (ETK) 13 PN493 14 PP034 PP440 2 PK632 PN407–PN408 PN410 PN416 4P V 0 2 3 P W 0 1 1 EDREES AVIATION (SME) 2 PL505 EG&G TECHNICAL SERVICES (EGN) 2 PJ205 PJ207–PJ210 PL763 EGYPTAIR (EGP) 17 PT561 PT563–PT565 ### Page 26 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 26 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT ESEN AIR LTD. (ESN) 2 PK317 PL729 ESTAFETA (EST) 1 PY275 14 PQ224–PQ225 3 PP833 PP846 ESTELAR (ESQ) 13 PL626 EUROPE AIRPOST (EUE) 14 PP392 PP951–PP952 PS641–PS642 15 PP925 3 PP832 PP947 9 PQ421 PQ771 PS607 PS643–PS644 EUROPEAN AVIATION AIR CHARTER (EUL) 1 PY273 2 PK041 PK044 PK046 PK048–PK049 PN001 3 PP965 EUROPEAN CAPITAL HOLDINGS (ECC) 2 PJ006 PK524–PK525 PK641–PK642 EXECUTIVE JET AIRCRAFT COMPANY (EXF) 2 PL441 EXPORT RESTRICTED AIRPLANES (YWV) 1 PY022 PY141–PY142 2 PJ003 PK214 PK391 PL758 9 PQ288–PQ289 EXPRESSAIR (PTX) 2 PK304 PM022 FAA (FAA) 2 PL768 FEDERATIVE REPUBLIC OF BRAZIL (BRZ) 2 PK068–PK069 FIRST AIR (BRS) 1 PY133 PY281 PY410 PY421 2 PK358 PL407 FLAIR AIRLINES (FLR) 16 PW662 4P W 5 0 3 FLANA (FLQ) 1 PY270 ### Page 27 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 27 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT FLYING CARPET (FYC) 2 PM064 PN140 FLYLAL CHARTERS (LCT) 14 PQ189 FRESH AIR LTD. (FRR) 2 PN024 PN035 FUTURA (FUA) 14 PP430 PP432 16 PW047–PW048 PW101 PW266 3P P 8 9 9 4P V 0 3 2 P W 5 6 1 GA TELESIS, LLC (GTG) 2 PK233 PK235 PK739 GARUDA INDONESIA (GIA) 10 PQ487 11 PW461–PW467 14 PP508 PQ285 16 PV271 PW067 PW119 PW712 9 PM404 PP514 PS653 GARY AIRCRAFT (GRH) 2 PL745 GE AVIATION MATERIALS (GML) 3P P 0 0 1 GECAS (GEF) 14 PP840 2 PK026–PK027 PK256 PK466–PK467 3 PP235–PP236 4 PW009 PW012 PW018–PW019 PW021 9 PM398 PM410–PM411 GENERIC CUSTOMER/SUPPLIER (XXX) 1P Y 4 1 1 P Y 6 1 1 14 PP046 PP431 PP436–PP438 PP936 15 PQ199 17 PT382–PT383 PT385 2 PH743 PJ005 PJ110–PJ111 PK029 PK112 PK144 PK253 PK274 PK286 PK503 PK519 PK801 PK803–PK804 PK821 PK934 PL004 PL009 PL012 PL014–PL016 PL023 PL107 PL112 PL740–PL741 PL793 PM253 3P P 0 3 1 P P 1 6 1 ### Page 28 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 28 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT GEORGIAN AIRWAYS (GEI) 14 PP044 17 PT611 5P T 1 8 1 GERMANIA (GER) 14 PP507 PP838 PQ152 PQ234–PQ235 3 PP961 9P Q 2 3 0 GLOBAL AIR (YCH) 2 PJ004 PK145 PK548 PK595 PL013 GOL AIRLINES (GOT) 14 PP922 PQ120 PQ143–PQ145 PQ158 PQ162–PQ163 PQ191 PQ193 PQ195 PQ227 PQ303 15 PP988 9 PP989–PP990 HAINAN AIRLINES (HNA) 14 PQ088–PQ091 PQ156–PQ157 4P W 0 9 3 9 PS611 PS613 HAMBURG INTERNATIONAL (HAU) 3 PP904 HOLA AIRLINES (HLB) 4P W 0 0 6 IAI (IAI) 2 PK692 ICARO (IKA) 1 PY461 2 PK742 PK771 IDM CAS (IDN) 2 PK552 ILFC (ILF) 14 PQ302 17 PT169 9P Q 4 9 1 INDIAN AIR FORCE (IDF) 2 PM016–PM017 INTAL AIR (IRT) 1 PY242 PY274 2 PK312 ### Page 29 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 29 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT INTERAIR (ITI) 1 PY046–PY047 2 PK546 PK610 PL108 PL113 INTERLINK AIRLINES (ILK) 2 PK743 PK904 PK907 PL103 IRAQI AIRWAYS (IRQ) 14 PQ198 JANCO AIRCRAFT AND ENGINES (JNC) 2 PM282–PM283 JAPAN TRANSOCEAN AIR (SWL) 16 PW520 PW681–PW683 4 PW515–PW516 JAT YUGOSLAV AIRLINES (JAT) 14 PP778–PP779 PQ241 3 PP771–PP777 4P V 0 2 4 JATAYU AIR (JAJ) 2 PJ117 PK257 PK511 JET LITE (JPQ) 16 PW064 PW066 9P Q 3 0 6 JET MIDWEST (JMI) 2 PK558 PM057 PM060 PM066 JET TIME (JME) 14 PM384 PM391 3P P 5 0 4 P P 8 9 7 JET2.COM LTD (CEX) 14 PP908–PP909 PP913–PP914 PQ038–PQ039 3 PQ027 PQ030–PQ037 PQ051–PQ052 PQ054–PQ055 PQ058–PQ059 JET4YOU.COM (JFU) 4P W 5 1 1 P W 6 6 1 JETAIRFLY (TLB) 17 PT103 JETCONNECT LIMITED (JCL) 14 PQ013–PQ016 16 PW540 PW542–PW543 3P Q 0 1 2 ### Page 30 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 30 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT JETLEASE (JLI) 1 PY595 JETRAN INTERNATIONAL, LTD. (JTI) 2 PK593 JETSCAPE LEASING (IAN) 4P W 0 0 8 JETSTAR PACIFIC AIRLINES (PAH) 16 PW102 PW316 JORDAN AVIATION (JOR) 14 PQ123–PQ124 PQ187 17 PT671 3 PP896 4P W 5 0 2 JSC "AIRCOMPANY SCAT" (DVW) 17 PT426 PT435 JSC STARLINE.KZ (MZK) 2 PK911 PL556 KARTHAGO AIRLINES (KAG) 14 PQ180 9 PP926 PP928 PP930 KARTIKA AIRLINES (KRK) 2 PK309–PK310 KD AVIA (JSK) 14 PP196 PP426 PP429 PP837 PP843–PP844 PP916 PQ232 3 PP016 PP305 PP383 PP418 PP424 PP475 PP801 PP867 PP870 9 PS652 KLM - ROYAL DUTCH AIRLINES (KLM) 14 PP871–PP873 16 PW616–PW619 3 PP861 PP863–PP864 4 PW014 PW017 PW611–PW615 9 PP874–PP875 LAC (CQC) 1 PY113 LAM (LAM) 2 PL455–PL456 PN451 PN454 ### Page 31 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 31 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT LAN AIRLINES (LAN) 2P K 4 3 1 P K 9 1 4 LAPA ARGENTINA (LAZ) 2P K 0 5 1 LAS VEGAS SANDS, CORP. (LVS) 14 PP506 PQ236 LIBYAN AIRLINES (LAA) 2P K 3 6 1 LINEAS AEREAS AZTECA (AZX) 14 PP983 PP986 LION AIR (MLI) 16 PW037–PW038 PW042 3 PP181–PP182 4 PW016 PW022–PW023 PW025 PW029 PW501 LJH AVIATION MANAGEMENT (WAT) 2 PL006 LLC GLOBUS (LLG) 16 PW526 LOBAYE AIRWAYS (LBY) 2 PN409 LOCALEASE (LLA) 2P K 2 8 2 LOCKHEED MARTIN (LMA) 3P Q 0 5 7 LOT POLISH AIRLINES (LOT) 11 PV283 16 PV281–PV282 PW065 17 PT651–PT655 LUFTHANSA GERMAN AIRLINES (DLH) 14 PQ062–PQ073 PQ092 17 PT331–PT360 3 PQ060–PQ061 9 PQ074–PQ085 PS701–PS703 LUXAIR (LUX) 17 PT672 MACEDONIAN AIRLINES, MACEDONIA (MCC) 17 PT612–PT613 ### Page 32 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 32 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT MACQUARIE AIR FINANCE (ZGT) 16 PW504 3 PP022 PP962 MAGELLAN AIRCRAFT SERVICES (MAP) 14 PQ113 MAGNICHARTERS (MAM) 14 PQ168 2 PK143 PL454 PL554 PL558 3 PP405 PQ028 MALAYSIA AIRLINES (MAS) 11 PJ551 PW224–PW230 16 PW044 PW201–PW214 PW217–PW223 7P J 5 5 2 MANDALA AIRLINES (MND) 2 PK255 PK636 PL027 PL421 PL744 PN002 4P W 0 0 4 P W 0 1 0 MANGAL AIRLINES (MGG) 2 PL785 MARANATHA LEASING CORPORATION (MNT) 2 PK201–PK202 PL011 MAX AVIA (MXY) 2 PK222 PK315 PK671 PK830 PL732 MERPATI NUSANTARA AIRLINES (PNM) 14 PP043 PP434–PP435 PQ281 2 PK354 PK614–PK615 PK623–PK624 PK819 PK917 PK929–PK930 PL409 3 PP898 4P W 0 9 1 MEXICO'S PRESIDENTIAL AIRCRAFT (MXG) 14 PP919 PQ155 MIDAMERICAN AEROSPACE, LTD (MML) 1 PY231 2 PL557 MIRAGE AVIATION LTD (MLE) 3 PP991 MISTRAL AIR (MSX) 14 PQ222 9 PQ341 PS638 ### Page 33 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 33 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT MNG AIRLINES (MHK) 4 PW512 PW514 PW593 NAT AVIATION U.S.A. (NTV) 2 PK258 PK551 PK557 PK732 NATIONAL CITY (NTJ) 2 PL471 NATIONWIDE AIRLINES (NWR) 2 PJ007–PJ008 PK357 PK741 PK871 PK906 PK928 PK932 PL631–PL632 PN107 PN109 NEW AXIS AIRWAYS (NXA) 14 PQ301 4P W 0 3 3 NEWJET (NES) 2 PL172 PL562 NICON AIRWAYS LTD. (EAV) 2 PL453 PN032 NOK AIR (OWL) 16 PM553 PW045 NOLINOR AVIATION (NLO) 1 PY671–PY672 NORDESTE (NDT) 14 PP987 NORTHERN AIR CARGO (NAC) 2 PN150–PN152 NORTHSTAR PRESIDIO MANAGEMENT (INH) 2 PK094–PK095 NORWEGIAN AIR SHUTTLE AS (NSB) 14 PM381 PM389 PP805–PP808 PP918 PP985 9 PM401–PM402 PQ791 PQ793 PS601 PS654 NOVA AIR (PDM) 2 PL007 PL406 PN412 PN414 OKAY AIRWAYS COMPANY LIMITED (OKY) 3P P 6 3 1 P P 6 3 4 9P Q 2 9 0 ### Page 34 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 34 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT OLYMPIC AIRLINES (OLY) 16 PV201–PV202 PV231 PW068 PW072 PW711 PW713–PW717 PW771 4P W 0 6 3 9 PS657 OLYMPIC AIRWAY SERVICES (OLS) 4P W 0 6 2 ONE SOURCE AEROSPACE (OSA) 2 PK043 ORENBURG AIRLINES (ORG) 17 PT010 PT301–PT302 4P W 0 2 8 P W 0 3 6 ORIX AVIATION SYSTEMS (OXA) 5P T 1 2 1 OUR AIRLINE (NAU) 3 PP831 PP902 OZJET AIRLINES (OZJ) 2 PK045 PK050 PK052–PK053 PACE AIRLINES (PIE) 2 PL001 PL502–PL503 PN102 PN116 3 PP835 PACIFIC PEARL AIRWAYS (PPA) 2P N 1 4 6 PACIFIC SKY AVIATION INC. (SEF) 17 PT219 PAKISTAN INT'L AIRLINES (PIA) 3 PP281–PP286 9 PS612 PAMIR AIRWAYS (PMY) 2P N 1 3 5 PEGASUS AIRLINES (PGS) 4P W 0 3 0 PERUVIAN AIR FORCE (PRF) 2P N 0 8 2 PERUVIAN AIR LINE S.A. (PVU) 2 PK802 PHILIPPINE AIRLINES (PAL) 9P Q 8 0 3 ### Page 35 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 35 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PHUKET AIRLINES (PHK) 2 PN037 PN039 PLATINUM AIRWAYS (PLW) 14 PP189 PLUNA (PLU) 2 PL201–PL203 PRECISIONAIR (PCR) 15 PM395 PT. INDONESIA AIRASIA (WAA) 14 PM388 PM390 9 PP516–PP517 PT. TOP AIR (PTZ) 13 PK528 2P K 9 3 7 Q AVIATION (QAV) 14 PQ132 2 PK288 PK603–PK604 QANTAS (QAN) 11 PW546 PW557 16 PW536–PW539 PW541 PW544–PW545 3 PQ002 PQ007 PQ009 PQ011 4 PW531–PW535 QUIKJET (QKJ) 14 PQ221 PQ223 REGIONALCARGO (RGC) 1P Y 0 5 7 REPEX AIRLINES (REX) 1 PY102–PY103 REPUBLIC OF INDONESIA (IDO) 2 PL601–PL603 REPUBLIC OF KOREA AIR FORCE (KAF) 3P P 2 2 1 REPUBLIC OF NIGER (NIR) 1P Y 1 6 6 REPUBLIC OF VENEZUELA (VNZ) 2P K 0 7 0 REPUBLICAIR (RPB) 2 PL553 PL555 ### Page 36 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 36 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT RICO (RLA) 2 PK120 ROSSIYA RUSSIAN AIRLINES (STG) 17 PT164–PT168 ROYAL AIR MAROC (RAM) 17 PT582–PT584 2 PK271–PK272 ROYAL KHMER AIRLINES (KHM) 2P N 1 6 3 RUTACA AIRLINES (ZRU) 2 PK281 PK611 PK613 PK901 PK903 PK915–PK916 PM062 RUTAS AEREAS VENEZOLANAS S.A. (RTV) 2 PK822 PL402 PL414 PN145 PN157 RYAN INTERNATIONAL AIRLINES (RYN) 14 PQ197 2 PK543 PK606 RYM AIRLINES (RYM) 2 PL017–PL018 S7 AIRLINES (SBR) 16 PM556 PW094 17 PT381 PT388–PT389 PT501–PT502 PT505–PT506 4P W 0 5 1 SAFAIR (SFA) 2 PK731 PK746 PK824 PK974 PL061 SAFAIR OPERATIONS (SFZ) 2 PK820 SAFI AIRWAYS (FFI) 3 PP521–PP522 SAMA AIRLINES (AWM) 14 PP509 15 PM393–PM394 9 PS606 PS651 SAS NORWAY (BRT) 16 PW574 PW576 17 PT002–PT004 PT006–PT008 PT011 PT024–PT025 4P W 5 7 3 ### Page 37 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 37 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT SAT AIRLINES (SKH) 2 PL221 PN158 SAUDI ARABIAN AIRLINES (SVA) 1P Y 0 3 6 2 PK316 PL727–PL728 PL730–PL731 PL733 SEAGLE AIR (SGQ) 3P P 9 6 4 SHAHEEN INTERNATIONAL (SHK) 2 PK602 PK608 PL003 PL551 PL561 PN036 SHANTOU AIRLINES (SHT) 9 PM415–PM417 SHENZHEN AIRLINES (SHZ) 9 PQ486 PS691–PS692 SIERRA PACIFIC AIRLINES (SRP) 2 PK627 PL621 SILVER AIR (SARL) (SVT) 14 PP935 2 PK313–PK314 PL726 PL734 3P P 8 6 5 SILVER SKY (SLZ) 2 PN419 SKY AIRLINES (SYC) 11 PW278 16 PV235 PW281 PW293 PW296 SKY EXPRESS (SXR) 17 PT058 PT124 PT217–PT218 PT616 3P Q 0 5 6 5P T 1 2 3 P T 1 4 6 9 PQ258–PQ259 SKY HOLDING COMPANY (PSH) 2 PK752 PL401 PL403 PN491 3P P 8 0 2 SKY KING (SKN) 2 PK351–PK353 PK696 PL002 PN156 PN162 ### Page 38 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 38 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT SKY SERVICE (SSV) 2 PK526–PK527 PK628–PK629 PK772 PK881 PK884 PK902 PK908 PK910 PK923 PK927 PK971 PK973 PL736 SKYEUROPE (SKP) 12 PT438 17 PT434 SKYNET ASIA AIRWAYS (SNU) 16 PM555 4P W 0 2 6 SLOK AIR (SRO) 2 PM108–PM113 SOUTH AFRICAN AIRWAYS (SAA) 2 PL104–PL106 9 PM413–PM414 SOUTHERN WINDS (SOW) 2 PK047 PK616 SOUTHWEST AIRLINES (SWA) 14 PP169 PP188 PP190–PP193 PP205 PP353 PP727 PP731 18 PP149–PP160 PS751–PS762 19 PU001–PU007 2 PM065 20 PU008–PU025 21 PP127–PP148 3 PP101–PP118 PP121–PP126 PP163–PP168 PP202–PP204 PP301–PP304 PP351 PP376–PP380 PP382 PP402–PP403 PP501–PP502 PP803–PP804 PP821–PP824 PP827 SPACE WORLD AIRLINE/SWA (WIN) 2 PL021–PL022 SRIWIJAYA AIR (SJA) 14 PP910 2 PJ114 PK302–PK303 PK307–PK308 PK777 PM021 PM254 PN023 PN026–PN027 PN040 PN042–PN043 4 PW034–PW035 PW061 9 PP927 STA SUPPLIES PTE. LTD. (SSP) 14 PQ040–PQ041 STAR (EQA) 13 PN512 ### Page 39 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 39 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT STAR AIR (SGY) 2 PN033 STAR UP S.A. (SRU) 2 PJ115 PK921 PL611 STEWART INDUSTRIES INT'L (SDT) 13 PN473 2 PK905 PK926 PK935 PM251 SUNDOWNER OKLAHOMA CITY LLC (SDO) 16 PW313 SWIFT AIR (SWF) 14 PM392 3 PP352 PP847 PP862 PP948 SWIFT AIR LLC (SFW) 16 PV042–PV043 4P W 5 6 3 TAAG (ANGOLA AIRLINES) (ANG) 1P Y 1 6 2 2 PK661 PK664–PK666 TACA INTERNATIONAL AIRLINES (TAC) 2 PL737 PN420 TAF LINHAS AEREAS (TFL) 2 PL404 PN160 TAILWIND AIRLINES (TWK) 11 PW243–PW244 TAROM - ROMANIAN AIR TRANSPORT (TRM) 10 PQ931–PQ932 TEEBAH AIRLINES (EBH) 2 PK601 PK605 PN028 THAI AIRASIA (THA) 3 PP411–PP412 PP676–PP677 PP684 PP686–PP687 THAI AIRWAYS INTERNATIONAL (TII) 16 PW164–PW167 4 PW161–PW162 PW594 THE MOURITZEN FAMILY TRUST (MRZ) 1P Y 1 9 1 THE PEGASUS AVIATION COMPANY (PEG) 2P K 2 8 5 ### Page 40 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 40 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT TITAN AIRWAYS (TIU) 14 PM387 PP505 9 PS636–PS637 TNT AIRWAYS (TNB) 14 PP391 PP433 PP845 3 PP384 PP413–PP414 PP472 PP474 PP702 PP711 TRAFIC (TFI) 1 PY056 TRANS AIR CONGO (TSC) 2 PK562 PK763 TRANSAERO AIRLINES (TRX) 14 PP966 16 PW040 PW120 17 PT046 PT049 PT052 PT104–PT105 2 PK451 PK773 PK779 3 PP963 4 PW024 PW113–PW114 TRANSMILE AIR SERVICES (TML) 1 PY151 13 PN474 2P N 4 7 2 TRAVEL SERVICE (TSF) 12 PT436 17 PT432 TRIGANA AIR (TGN) 2 PL504 TRITON AVIATION SERVICES (TIA) 2 PK677 PL408 PL410–PL411 PL770 PN101 PN105–PN106 PN108 TUIFLY (HAP) 4P W 5 1 3 TUNISAIR (TUN) 17 PT641–PT642 TURKISH AIRLINES (THY) 16 PM552 PM559–PM560 PM562–PM564 PW049–PW050 TURKMENISTAN AIRLINES (TUE) 9 PQ265 PQ801–PQ802 UETAAM (MXA) 2P N 0 4 1 ### Page 41 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 41 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT UKRAINE INTERNATIONAL AIRLINES (UKR) 14 PM382 PQ251 16 PM551 PM554 PM561 PW701–PW702 PW742 17 PT043 PT048 PT055 PT059 PT511–PT512 UNITED AIR LINES (UAL) 14 PQ111–PQ112 PQ114–PQ115 PQ118 PQ121–PQ122 PQ125–PQ131 PQ133–PQ140 PQ146–PQ151 PQ164–PQ167 PQ169–PQ179 PQ181–PQ183 PQ185–PQ186 15 PQ201–PQ202 17 PT384 PT386–PT387 PT390–PT395 PT398–PT399 PT402–PT419 PT422–PT423 3 PQ101–PQ110 UNIVERSAL ASSET MANAGEMENT (UAM) 2 PM056 PM059 PM061 UNKNOWN CUSTOMER (UNZ) 17 PT185 2 PK111 PK114 PK118–PK119 PK675 US AIR FORCE (USF) 2 PJ202 PJ206 PJ211 PJ213–PJ219 US AIRWAYS (USA) 14 PP032 PP036–PP038 PP047–PP054 PP185–PP187 PP194–PP195 PP197 PP428 PP439 16 PV044–PV055 2 PL081 PL560 3 PP005 PP007 PP014–PP015 PP024–PP027 PP029–PP030 PP183–PP184 PP401 PP417 PP834 PP891 PP893 PP895 PP901 PP931–PP934 4 PV001–PV010 PV012–PV022 PV025–PV030 PV033–PV040 9P S 6 6 9 UT FINANCE CORPORATION (ZZJ) 14 PQ153 VASP AIRLINES (VSP) 2P K 5 8 1 9P P 5 1 2 VIKING AIRLINES (VAI) 9P Q 2 9 1 VISION AIR (VIL) 2P K 8 6 3 3P P 6 8 5 ### Page 42 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 42 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT VIVA AEROBUS (VIV) 14 PP041 PP427 3 PP009–PP010 PP013 PP023 PP473 VOLVO AERO SERVICES (AGD) 3 PP381 WEBJET LINHAS AEREAS LTDA. (WJL) 14 PP839 PP906–PP907 PQ159 PQ188 15 PQ256–PQ257 9 PQ260–PQ261 PQ266–PQ267 PS603 WELLS FARGO (FSB) 9 PP513 WEST DOVER LLC (WDR) 3 PP415 WESTAIR CARGO AIRLINES (WCO) 1 PY037 WESTSTAR AVIATION (WSE) 2 PK565 WILMINGTON TRUST COMPANY (WBT) 14 PP035 PP042 PP045 WINGS OF LEBANON S.A.L. (WGL) 2P N 1 4 1 XSTRATA CANADA CORPORATION (NAD) 1 PY612 XTRA AIRWAYS (CIN) 16 PW761 4P W 1 1 7 ZAMBIAN AIRWAYS (MBA) 2 PK220 PL109 ZASA (CZA) 2 PL735 IDENTIFICATION BY VARIABLE NUMBER Variable Group PG584–PG586 2 PH001 2 PH011–PH013 2 PH021–PH024 2 PH743 2 ### Page 43 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 43 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PJ003–PJ009 2 PJ105–PJ119 2 PJ201–PJ219 2 PJ301–PJ302 16 PJ551 11 PJ552 7 PK026–PK029 2 PK041–PK053 2 PK061–PK070 2 PK081–PK082 2 PK091–PK099 2 PK101–PK103 2 PK111–PK120 2 PK141–PK146 2 PK201–PK204 2 PK211–PK223 2 PK231–PK241 2 PK251–PK258 2 PK271–PK274 2 PK281–PK289 2 PK291 2 PK301–PK318 2 PK341 2 PK351–PK361 2 PK391 2 PK431–PK433 2 PK451–PK452 2 PK461–PK469 2 PK495 2 PK501–PK504 2 PK511–PK515 2 PK519 2 PK521–PK527 2 PK528 13 PK541–PK565 2 PK581 2 PK591–PK599 2 PK601–PK617 2 PK621–PK637 2 Variable Group ### Page 44 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 44 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PK641–PK642 2 PK661–PK666 2 PK671–PK681 2 PK691–PK697 2 PK711–PK716 2 PK731–PK765 2 PK771–PK779 2 PK801–PK804 2 PK819–PK827 2 PK830 2 PK861–PK863 2 PK871–PK874 2 PK881–PK884 2 PK901–PK938 2 PK971–PK974 2 PL001–PL028 2 PL061 2 PL081 2 PL101–PL113 2 PL151 2 PL171–PL172 2 PL201–PL203 2 PL221 2 PL401–PL417 2 PL421 2 PL441 2 PL451–PL456 2 PL471 2 PL491 2 PL501–PL506 2 PL551–PL562 2 PL581 2 PL601–PL603 2 PL611 2 PL621–PL625 2 PL626 13 PL631–PL632 2 PL717–PL746 2 PL747 13 Variable Group ### Page 45 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 45 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PL756 2 PL758 2 PL761–PL770 2 PL781–PL788 2 PL793 2 PM001–PM006 2 PM016–PM017 2 PM021–PM023 2 PM051–PM066 2 PM101–PM119 2 PM141–PM142 2 PM171 2 PM181 2 PM251–PM255 2 PM281–PM283 2 PM381–PM392 14 PM393–PM395 15 PM396–PM399 9 PM401–PM417 9 PM541 9 PM542 10 PM543–PM547 6 PM551–PM564 16 PN001–PN002 2 PN021–PN043 2 PN081–PN086 2 PN101–PN117 2 PN131–PN163 2 PN401–PN420 2 PN431–PN433 2 PN451–PN456 2 PN471–PN472 2 PN473–PN474 13 PN481 2 PN491–PN492 2 PN493 13 PN501 2 PN502 13 PN511–PN512 13 Variable Group ### Page 46 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 46 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PN521 13 PP001–PP031 3 PP032–PP054 14 PP101–PP126 3 PP127–PP148 21 PP149–PP160 18 PP161–PP168 3 PP169 14 PP181–PP184 3 PP185–PP199 14 PP201–PP204 3 PP205 14 PP221 3 PP231–PP243 3 PP281–PP286 3 PP301–PP305 3 PP351–PP352 3 PP353 14 PP376–PP384 3 PP391–PP393 14 PP401–PP424 3 PP425–PP440 14 PP471–PP475 3 PP501–PP504 3 PP505–PP510 14 PP511–PP517 9 PP521–PP522 3 PP631–PP634 3 PP651–PP652 3 PP671–PP699 3 PP701–PP720 3 PP721–PP733 14 PP771–PP777 3 PP778–PP779 14 PP801–PP804 3 PP805–PP808 14 PP821–PP827 3 PP831–PP836 3 PP837–PP845 14 Variable Group ### Page 47 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 47 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PP846–PP848 3 PP851 3 PP852 14 PP861–PP870 3 PP871–PP873 14 PP874–PP875 9 PP891–PP899 3 PP901–PP905 3 PP906–PP924 14 PP925 15 PP926–PP930 9 PP931–PP934 3 PP935–PP936 14 PP946–PP948 3 PP951–PP952 14 PP961–PP965 3 PP966–PP967 14 PP981–PP982 3 PP983–PP987 14 PP988 15 PP989–PP990 9 PP991 3 PP993 14 PQ001–PQ012 3 PQ013–PQ016 14 PQ026–PQ037 3 PQ038–PQ041 14 PQ051–PQ061 3 PQ062–PQ073 14 PQ074–PQ085 9 PQ086 3 PQ087–PQ092 14 PQ101–PQ110 3 PQ111–PQ198 14 PQ199 15 PQ201–PQ202 15 PQ221–PQ229 14 PQ230 9 PQ231–PQ236 14 Variable Group ### Page 48 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 48 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PQ237 9 PQ241–PQ243 14 PQ251–PQ255 14 PQ256–PQ257 15 PQ258–PQ267 9 PQ281–PQ286 14 PQ287 15 PQ288–PQ296 9 PQ301–PQ305 14 PQ306–PQ307 9 PQ331–PQ332 14 PQ341–PQ344 9 PQ361–PQ369 9 PQ401–PQ406 9 PQ407 10 PQ408 6 PQ411–PQ413 9 PQ421 9 PQ471–PQ472 10 PQ473 6 PQ479–PQ480 10 PQ481 9 PQ486 9 PQ487 10 PQ491–PQ493 9 PQ771 9 PQ791–PQ793 9 PQ801–PQ803 9 PQ804–PQ805 10 PQ931–PQ932 10 PS601–PS616 9 PS631 9 PS636–PS638 9 PS641–PS642 14 PS643–PS644 9 PS651–PS657 9 PS666–PS668 14 PS669 9 PS691–PS692 9 Variable Group ### Page 49 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 49 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PS701–PS703 9 PS751–PS762 18 PT001–PT011 17 PT021–PT023 5 PT024–PT027 17 PT028 12 PT041–PT059 17 PT060–PT063 12 PT064 8 PT101 5 PT102–PT105 17 PT121–PT123 5 PT124–PT125 17 PT146 5 PT147–PT148 17 PT161–PT170 17 PT181–PT182 5 PT183–PT187 17 PT211–PT214 5 PT215–PT220 17 PT295 5 PT301–PT303 17 PT304–PT306 12 PT331–PT360 17 PT381–PT399 17 PT401–PT435 17 PT436–PT438 12 PT501–PT512 17 PT561–PT565 17 PT581–PT584 17 PT611–PT621 17 PT641–PT642 17 PT651–PT655 17 PT671–PT672 17 PT701–PT703 17 PU001–PU007 19 PU008–PU025 20 PV001–PV040 4 PV041–PV055 16 Variable Group ### Page 50 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 50 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PV201–PV202 16 PV203 11 PV231–PV237 16 PV271–PV272 16 PV281–PV282 16 PV283 11 PW001–PW036 4 PW037–PW050 16 PW051 4 PW052–PW054 16 PW061–PW063 4 PW064–PW068 16 PW072 16 PW091–PW093 4 PW094 16 PW101–PW102 16 PW106 16 PW111–PW117 4 PW118–PW120 16 PW156–PW157 16 PW161–PW162 4 PW163–PW167 16 PW201–PW223 16 PW224–PW230 11 PW231–PW240 16 PW241–PW244 11 PW245 7 PW261 16 PW265–PW268 16 PW278 11 PW281 16 PW282–PW284 7 PW293 16 PW296 16 PW301–PW323 16 PW324–PW327 11 PW461–PW467 11 PW501–PW503 4 PW504 16 Variable Group ### Page 51 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 51 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT PW511–PW518 4 PW519–PW520 16 PW526 16 PW531–PW535 4 PW536–PW545 16 PW546 11 PW556 16 PW557 11 PW561–PW563 4 PW564 16 PW571–PW573 4 PW574–PW576 16 PW591–PW594 4 PW595–PW596 16 PW611–PW615 4 PW616–PW620 16 PW631–PW632 4 PW633–PW634 16 PW661 4 PW662 16 PW681–PW683 16 PW701–PW702 16 PW711–PW717 16 PW741–PW742 16 PW761 16 PW771 16 PY022 1 PY036–PY037 1 PY046–PY048 1 PY051–PY053 1 PY056–PY057 1 PY101–PY103 1 PY111–PY113 1 PY131–PY135 1 PY141–PY143 1 PY151–PY154 1 PY156–PY157 1 PY161–PY162 1 PY166 1 Variable Group ### Page 52 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 52 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT 2. Spares Affected None. PY191 1 PY201 1 PY221–PY222 1 PY231 1 PY241–PY244 1 PY270–PY275 1 PY281 1 PY286 1 PY401 1 PY409–PY411 1 PY421–PY422 1 PY441 1 PY451 1 PY461–PY463 1 PY591–PY595 1 PY611–PY612 1 PY621 1 PY631 1 PY651 1 PY671–PY672 1 PY721 1 PY741 1 Variable Group ### Page 53 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 53 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT B. Concurrent Requirements None C. Reason Accomplishment of the inspections, modifications and repairs given in this service bulletin will ensure that fuselage skin cracks at chem-mill lines are found and repaired. This action is necessary to find and fix fatigue cracking of the skin panels which could result in sudden fracture and failure of the skin panels of the fuselage, and consequent rapid decompression of the airplane. Operators have reported horizontal cracks along the edges of the chem-milled pockets in the skin at S-12 in the bay forward of body station STA 520 and just above the S-4, S-10, and S-14 lap joints. Operators have reported 37 horizontal chem-mill line cracks of the fuselage crown skin at non-lap-joint areas. Skin inspection maps as given in this service bulletin present areas that need to be inspected for crown chem-mill line cracks. Fuselage skin cracks at tear strap attachments to the fuselage skin have also been reported by some operators. The chem-mill cracks were up to 8 inches long, and on at least 4 of the airplanes multiple adjacent bays were found to be cracked along the same stringer. These airplanes had flown 23,425 to 64,420 flight-cycles. Operators have reported numerous horizontal skin cracks along the edges of the chem-milled pockets in the skin below S-14, and section 41. The cracks were up to 7.25 inches long. These airplanes had flown 22,786 - 80,113 flight-cycles. Operators have also reported 13 circumferential cracks along the vertical chem-mill steps of the fuselage skin next to the STA 360, STA 727 and STA 908 Butt-Joints. The most critical situation was four in-line cracks in multiple adjacent bays on the aft side of the STA 908 butt joint from S-3R to S- 7R. Crack lengths varied from 0.75 inch to 4 inches. These airplanes had flown 45,100 flight cycles (65,200 flight hours) to 67,400 flight cycles (70,800 flight hours). Analysis by Boeing indicates that these cracks are caused by fatigue due to tension stresses plus local bending stresses at the edge of chem-milled pockets or bonded skin doublers. Boeing did a cost benefit analysis on the changes given in this service bulletin. Refer to Appendix A for the analysis. Boeing Service Related Problem (SRP) 737-SRP-53-0281 is related to this service bulletin. Revision 1 was sent to: — Clarify in the Summary, Reason and Description sections that cracks were reported at stringer 12. — Move S-12 data from the second table to the first table in the Reason section. — Add the Preventive Modification to the Manpower table. — Add Cost Benefit Analysis and Weight and Balance information. — Add SRM 53-30-03; NDT 53-30-09; SIIA 737-242 and installation drawings to the Reference section. — Revise the Figures referenced in Parts and Materials Supplied by Operator and added the material required to perform the Preventive Modification. — Delete the Group 7 inspection requirements from the Part 1 Work Instructions. — Add reference to AMM for fairing removal in Part 3 Lower Lobe Area Skin Inspection. — Add Part 6 Preventive Modification requirements for Groups 3, 5, 6, and 8 to the Work Instructions. — Add Preventive Modification to Figure 1 and changed the reference of Fig. 3-10 to Fig. 3-9. — Add the reference of 737-300 to Figure 5, 737-400 to Figures 6 and 14, and 737-500 to Figures 7 and 15. ### Page 54 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 54 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT — Delete the inspection requirements at S-4 and S-10 locations in Figure 8 on Group 6 airplanes. — Delete the original Figure 9, which was the inspection of group 7 airplanes. — Revise the old Figure 10 to the new Figure 9 and deleted the inspection of S-4 and S-10 locations. — Add the Figure 10 Preventive Modification. — Revise 53-00-00 to 51-00-00 in Figure 16 notes c, e, f, g and Figure 20 notes a, c, and d.Boeing did a cost benefit analysis on the changes given in this service bulletin. Refer to Appendix A for the analysis. Revision 2 was sent to tell operators of modified inspection thresholds, modified inspection intervals, new inspection areas and to remove inspections from areas that have solid skins. Also additional NDT inspection methods have been added. Changes in Revision 2 of this service bulletin include: - — Subject: The title is changed to include "chem-mill line crack". — Background and Reason: Have been updated to include new data. — Action and Description: Have been updated to include new inspection locations and inspection methods. — Effectivity: Have been split into new groups. — Compliance Section: Updated the Compliance information. — Approval: Have been updated to include AD requirements. — Manpower: Have been updated to include new inspection areas. — Weight and Balance: Have been updated to remove Figure 16 and Figure 20 skin repairs. — References: Have been updated. — Work instructions: Have been updated to included new inspection areas, remove and add new skin repairs. — FIGURE 1 and FIGURE 2: Logic diagrams have been deleted. — FIGURE 3, FIGURE 4, FIGURE 5, FIGURE 6, FIGURE 7 and FIGURE 10: Have been updated to add new inspections. — FIGURE 8, FIGURE 9, FIGURE 16, FIGURE 19 and FIGURE 20: Have been deleted. — FIGURE 11, FIGURE 12, FIGURE 13, FIGURE 14 and FIGURE 15: Have been updated to remove inspection areas. — FIGURE 21 AND FIGURE 22: Adds NDT inspections between STA 259.5 and STA 360. — FIGURE 23: Adds NDT inspection of the tear straps. — FIGURE 24: Adds a skin repair for chem-mill line cracks at stringer 12. — FIGURE 25: Adds a vertical crack inspections at STA 312, STA 360, STA 460, STA 500C, STA 540, STA 727, STA 727G and STA 908. — FIGURE 26: Adds a skin inspection on the left side between STA 360 and STA 540. — FIGURE 27: Adds a skin inspection on the right side between STA 360 and STA 540. — FIGURE 28: Adds a skin inspection on the right side between STA 303 and STA 320 and between STA 344 and STA 352. — FIGURE 29: Adds skin inspections to the lower lobe area. — FIGURE 30: Adds a typical internal skin inspection. — FIGURE 31: Adds a skin inspection on the left side between STA 490 and STA 500. — FIGURE 32: Adds a skin inspection on the left side between STA 727 and STA 1016. — FIGURE 33: Adds a skin inspection on the left side between STA 360 and STA 540 and between STA 727 and STA 1016. — FIGURE 34: Adds skin inspections on the left and right side between STA 360 and STA 540. — FIGURE 35: Adds skin inspections on the left and right side between STA 727 and STA 1016. — FIGURE 36 and FIGURE 37: Adds a skin inspection on the left side between STA 360 and STA 540. — FIGURE 38: Adds a time limited skin repair for chem-mill cracks not located at lap joints. ### Page 55 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 55 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT — FIGURE 39: Adds a vertical crack inspections at STA 312, STA 360, STA 460, STA 500C, STA 540, STA 727 and STA 908. — FIGURE 40: Adds a vertical crack inspections at STA 312, STA 360, STA 460, STA 540, STA 727 and STA 908. — FIGURE 41: Provides skin inspections for the lower lobe area. — FIGURES 42, 43 and 44: Provide window belt inspections previously in Figures 5, 6 and 7 respectively. — FIGURE 45: Provides crown area skin inspections for Groups 18 and 21. — FIGURE 46: Provides crown area skin inspections for Groups 19 and 20. — FIGURE 47: Provides inspection for vertical cracks at chem-mill lines of fuselage skin for Groups 18 through 21. — FIGURE 48: Provides post repair inspection for the skin chem-mill crack repair at stringer 12. — FIGURE 49: Adds a vertical crack inspections at STA 312, STA 360, STA 460, STA 500C, STA 540, STA 727 and STA 908. Revision 3 is sent to add 737-400 airplanes to this service bulletin effectivity that were incorrectly removed in revision 2 of this service bulletin. Changes in Revision 3 of this service bulletin include: - — Paragraph 1.A., Effectivity: Airplanes PM551-PM557, PM559-PM563, PW037-PW050, PW052- PW054, PW094, PW106, PW156-PW157, PW261, PW265-PW268, PW281, PW293, PW296, PW504, PW519-PW520, PW526, PW536-PW545, PW556, PW564, PW575-PW576, PW595- PW596, PW616, PW633-PW634, PW662, PW681-PW683, PW701-PW702, PW711-PW717, PW741-PW742, PW761, PW771 are added to the Group 16 effectivity. — Summary Compliance: FAA Airworthiness Directive is added. — Paragraph 1.E.,Compliance: FAA Airworthiness Directive is added. Compliance information and SRM reference is updated. Damage tolerance based structural inspection statement is moved to Paragraph 1.K. Publications Affected. — Paragraph 1.F., Approval: Approval information is updated. — Paragraph 1.G., Manpower: Manpower tables for Group 6, Group 7 and Group 8 is updated. — Paragraph 1.H.,Weight and Balance Changes: Weight and balance information is updated. — Paragraph 1.J., References, 1. Existing Data: FAA Airworthiness Directive is added and SRM reference is updated. — Paragraph 2.C.2. Parts and Material Supplied by the Operator: Brackets are added to the ends of fastener part numbers. — Paragraph 3.B., Work Instructions, 1 Part 1, 5 Part 5 and 6 Part 6: SRM reference is updated. — Paragraph 3.B., Work Instructions, 6 Part 6 a.,(1),(a),4),{d}: A note is added to clarify staggered fasteners locations common to the time limited repair. — FIGURE 17 and FIGURE 18: The fastener pattern has been changed to stagger fasteners common to the tear strap. — FIGURE 24: Brackets are added to the ends of fastener part numbers and SRM reference is updated. — FIGURE 35: A new inspection area is added. ### Page 56 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 56 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT D. Description On all affected airplanes, do a detailed inspection and eddy current inspection of the fuselage skin for cracks at S-12 in the bay forward of STA 520, just above the S-4, S-10, and S-14 lap joints from STA 360 to STA 1016, at S-15 between STA 360 and STA 540, aft of STA 727 and other locations of known cracking identified in this service bulletin. Skin inspection maps as given in this service bulletin indicate additional areas that need to be inspected for possible signs of chem-mill line cracks at the fuselage crown. On all affected airplanes, do a High Frequency Eddy current (HFEC) Sliding Probe inspection of the tear strap attachments to the fuselage skin for signs of cracks at the locations as given in this service bulletin. On all affected airplanes, do detailed inspection of the crown area skins from S-10L to S-10R between STA 360 and STA 1016 for indications of horizontal chem-mill line cracks. On all affected airplanes, do a detailed inspection of the lower lobe skins for cracks from S-14L to S-14R, between STA 360 and STA 1016 and in Section 41 as given in this service bulletin. Skin inspection maps as given in this service bulletin indicate additional areas that need to be inspected for possible signs of chem-mill line cracks at the fuselage lower lobe and section 41. Also, on all affected airplanes do a detailed inspection and eddy current inspections of the fuselage crown skin (from S-10L to S-10R) for vertical cracks just forward and aft of STA 360, STA 500C, STA 540, STA 727, STA 727G, and STA 908, as applicable depending on the model, along the chem-mill lines as provided in this Service Bulletin. If any crack is found, repair as given in this service bulletin, or contact Boeing for repair instructions and install the repair. Revision 2 - More work is necessary on airplanes inspected as given in revision 1, or original issue of this service bulletin. Additional areas have been identified to be inspected for vertical and horizontal chem-mill line cracks. Inspection areas are clearly identified to facilitate compliance. Revision 3 - No more work is necessary on airplanes inspected as shown in Revision 2 of this service bulletin. ### Page 57 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 57 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT E. Compliance Federal Aviation Administration (FAA) Airworthiness Directives 2004-18-06 and 98-11-04 R1 are related to this service bulletin. Accomplishment of Boeing service bulletin (SB) 737-53A1177 Revision 2, 3, 4, 5 or 6 terminates inspections under the repair area only. On all airplanes: Accomplishment of SB 737-53A1177 does not terminate inspection requirements above S-10 lap joints on the left and right side from STA 540 to STA 727. Group 1-5, 9-21: Table 1 - Skin Inspection Requirements - Fuselage Crown Area And Other Areas Of Known Cracks - Horizontal Chem-Mill Line and Skin Cracks at the Tear Strap Tabs Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) Areas previously inspected as given in the original issue or revision 1 of this service bulletin. Do external detailed inspection and eddy current inspection for any crack as given in Accomplishment Instruction 3.B.1. Part 1 - Crown Area Skin Inspection.(c) (f) Within 4,500 flight cycles from the accomplishment of the last inspection as given in the original issue or revision 1 of this service bulletin. 4,500 Flight Cycles.(a)(b) Areas that have not been inspected as given in the original issue or revision 1 of this service bulletin. Do external detailed inspection and eddy current inspection for any crack as given in Accomplishment Instruction 3.B.1. Part 1 - Crown Area Skin Inspection.(c) (f) Before 35,000 total airplane flight cycles. 4,500 Flight Cycles.(b) Any crack found in the fuselage skin. Do the repair as given in Accomplishment Instruction 3.B.5. Part 5 - Permanent Repair. (d) (e) or Do the repair as given in Accomplishment Instruction 3.B.6. Part 6 - Time Limited Repair.(d) Before further flight. - Time Limited Repair is installed and is located at lap splice. Do an external detailed inspection of the repaired area for any cracks and loose, missing or damaged fasteners as given in Accomplishment Instruction 3.B.6.a.(1).(a).3). Within 3,000 flight cycles from the time the repair was installed. 3,000 flight cycles. (e) ### Page 58 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 58 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT Time Limited Repair is installed and is not located at lap splice. Do an external detailed inspection of the repaired area for any cracks and loose, missing or damaged fasteners as given in Accomplishment Instruction 3.B.6.a.(2).(c). Within 3,000 flight cycles from the time the repair was installed. 3,000 flight cycles. (e) Damaged or loose fasteners found. Replace any damaged or loose fasteners. Before further flight. - Crack found at a Time Limited Repair. Contact Boeing for repair instructions and install the repair. Before further flight. - Time Limited Repair is installed and is located at lap splice. Install permanent repair as given in Accomplishment Instruction 3.B.6.a.(1).(a).4). (g) Within 6,000 flight cycles from the time the repair was installed. Within 1,000 flight cycles from the date of revision 3 of this service bulletin. - Time Limited Repair is installed and is not located at lap splice. Install permanent repair as given in Accomplishment Instruction 3.B.6.a.(2).(d). (g) Within 6,000 flight cycles from the time the repair was installed. Within 1,000 flight cycles from the date of revision 3 of this service bulletin. - (a) Areas that have been inspected according to the previous releases of this service bulletin need to have repeat inspections according to the requirements of this table. (b) For non lap splice areas between STA 360 to STA 1016 and S-10L to S-10R it is optional to do general visual inspections at 1,000 flight cycle intervals in lieu of the detailed inspections. (c) It is not required to inspect the chem-mill steps under existing external repair doublers provided either: 1. The installed repair was approved by the FAA or by a Boeing company authorized representative who was authorized by the FAA to make such findings, and the installed repair extends a minimum of three rows of fasteners on each side of the chem-mill line, Or 2. The doubler extends a minimum of 2 rows beyond the chem-mill step and was accomplished in accordance with Figure 42 or 48 of 737-100/200 SRM 53-30-3, or Repair 30 or 31 of 737-300 SRM 53-00-01, 737-400 SRM 53-00-01 or 737-500 SRM 53-00-01. Inspections are not required directly under the repair doubler. Do the inspections required in areas adjacent to the doubler. If the repair does not meet the above conditions, then inspect the chem-mill step internally in the area covered by the doubler as given in 737 NDT, Part 6, 53-30-20. (d) If the repair given in Accomplishment Instructions, PART 5 or PART 6 are not applicable, contact Boeing for repair instructions and install repair before further flight. Group 1-5, 9-21: Table 1 - Skin Inspection Requirements - Fuselage Crown Area And Other Areas Of Known Cracks - Horizontal Chem-Mill Line and Skin Cracks at the Tear Strap Tabs Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 59 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 59 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT (e) Accomplishment of the Part 5 - Permanent Repair is terminating action for repeat inspections under the repair area only. (f) It is not required to inspect the skin at the tear strap tabs under existing external repair doublers provided either: 1. The installed repair was approved by the FAA or by a Boeing company authorized representative who was authorized by the FAA to make such findings, and the installed repair extends a minimum of three rows of fasteners above and below tear strap tab fasteners that require inspection, Or 2. The doubler extends a minimum of 2 rows above and below the tear strap tab fasteners that require inspection, and the repair was accomplished in accordance with Figure 48 of 737-100/200 SRM 53-30-3, or Repair 31 of 737-300 SRM 53-00-01, 737-400 SRM 53-00-01 or 737-500 SRM 53-00-01. Inspections are not required directly under the repair doubler. Do the inspections required in areas adjacent to the doubler. If the repair does not meet the above conditions, then inspect the skin under the repair doubler at tear strap tab using LFEC as given in 737 NDT, Part 6, 53-30-00 Figure 5. (g) Accomplishment of the permanent repair is terminating action for repeat inspections under the repair area only. Group 3, 9-10, 14-15, 18, 21: Table 2 - Skin Inspection Requirements - Fuselage Window Belt Area Between STA 500D to STA 520 and Stringer S-10 to S-14 - Horizontal Chem-Mill Line Cracks Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) Areas previously inspected as given in the original issue or revision 1 of this service bulletin. Do external detailed inspection and eddy current inspection as given in Accomplishment Instruction 3.B.2.a. (a) (c) Within 4,500 flight cycles from the accomplishment of the last inspection given in the original issue or revision 1 of this service bulletin. 4,500 Flight Cycles. Areas that have not been inspected as given in the original issue or revision 1 of this service bulletin. Do external detailed inspection and eddy current inspection as given in Accomplishment Instruction 3.B.2.a. (a) (c) Before 25,000 total airplane flight cycles. Within 4,500 flight cycles from the date of revision 3 of this service bulletin 4,500 Flight Cycles. Any crack found in the fuselage skin. Do the repair as given in Accomplishment Instruction 3.B.8. Part 8 - Skin Chem-Mill Line Crack At Stringer 12 - Repair Instructions. (b) (c) Before further flight. - Group 1-5, 9-21: Table 1 - Skin Inspection Requirements - Fuselage Crown Area And Other Areas Of Known Cracks - Horizontal Chem-Mill Line and Skin Cracks at the Tear Strap Tabs Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 60 Original Issue: December 14, 2000 Revision 3: July 16, 2009 737-53A1210 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 60 of 267 BOEING SERVICE BULLETIN 737-53A1210 ALERT ALERT (a) It is not required to inspect areas under existing external repair doublers provided the installed repair was approved by the FAA or by a Boeing company authorized representative who was authorized by the FAA to make such findings, and the installed repair extends a minimum of three rows of fasteners on each side of the chem-mill line. 1. If the repair does not meet the above conditions, then inspect the chem-mill step internally in the area covered by the doubler as given in 737 NDT, Part 6, 53-30-20. (b) If the repair given in Accomplishment Instructions, PART 8 is not applicable, contact Boeing for repair instructions and install repair before further flight. (c) Accomplishment of the preventive modification as given in Part 7 or the repair as given in Part 8 termi- nates the inspection requirements for the chem-mill steps common to stringer 12 only. All other chem-mill inspections in this area must continue. Group 4, 11, 16: Table 3 - Skin Inspection Requirements - Fuselage Window Belt Area Between STA 500E to STA 500F and STA 500G to STA 520 and Stringer S-10 to S-14 - Horizontal Chem-Mill Line Cracks Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) All Airplanes Do external detailed inspection and eddy current inspection as given in Accomplishment Instruction 3.B.2.b. (a) Before 25,000 total airplane flight cycles. Within 4,500 flight cycles from the date of revision 3 of this service bulletin 4,500 Flight Cycles. Any crack found in the fuselage skin. Contact Boeing for repair instructions and install repair. Before further flight. - (a) It is not required to inspect areas under existing external repair doublers provided he installed repair was approved by the FAA or by a Boeing company authorized representative who was authorized by the FAA to make such findings, and the installed repair extends a minimum of three rows of fasteners on each side of the chem-mill line. 1. If the repair does not meet the above conditions, then inspect the chem-mill step internally in the area covered by the doubler as given in 737 NDT, Part 6, 53-30-20. Group 3, 9-10, 14-15, 18, 21: Table 2 - Skin Inspection Requirements - Fuselage Window Belt Area Between STA 500D to STA 520 and Stringer S-10 to S-14 - Horizontal Chem-Mill Line Cracks Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) The text continues at https://openairdocs.org/service-documents/boeing/737-53a1210/file/44bc3b719bae.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.