# Boeing Alert Service Bulletin 737-53A1289: Revision 1 - Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2009-0913; AD 2010-26-06 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Boeing Alert Service Bulletin 737-53A1289](https://openairdocs.org/service-documents/boeing/737-53a1289.md) - Title as filed: U.S. DOT/FAA - Boeing Service Bulletin - Pages: 254 - PDF: https://openairdocs.org/files/sha256/a8/fa/a8faeb0d9ef05c64dc1829f1da368b1e17a2192c6fa39081703b28176aec782a - Page: https://openairdocs.org/service-documents/boeing/737-53a1289/file/a8faeb0d9ef0 ## Text Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 1 of 254 Commercial Airplanes 737 Service Bulletin Number: 737-53A1289 Original Issue: January 14, 2009 Revision 1: November 18, 2009 ATA System: 5300 SUBJECT: FUSELAGE - Skin - Inspection Of The Skin For Scribe Lines BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2009 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, 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, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the Boeing livery 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. ### Page 2 BLANK PAGE Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 2 of 254 BOEING SERVICE BULLETIN 737-53A1289 BLANK PAGE ### Page 3 Table of Contents Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 3 of 254 BOEING SERVICE BULLETIN 737-53A1289 Table of Contents Revision Transmittal Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . 76 3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . 76 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . 77 2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . 79 3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . 80 3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 FIGURE 1: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . . 126 FIGURE 2: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . . 129 FIGURE 3: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . . 132 FIGURE 4: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . . 135 FIGURE 5: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . . 138 FIGURE 6: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . . 141 FIGURE 7: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . . 144 FIGURE 8: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . . 147 FIGURE 9: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . . 150 FIGURE 10: FUSELAGE - SKIN LAP JOINT - ZONE 1 INSPECTION . . . . . . . . . . . . . . . . . 153 FIGURE 11: FUSELAGE - SKIN LAP JOINT - ZONE 2 INSPECTION . . . . . . . . . . . . . . . . . 156 ### Page 4 Table of Contents Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 4 of 254 BOEING SERVICE BULLETIN 737-53A1289 FIGURE 12: FUSELAGE - SKIN LAP JOINT - ZONE 2 INSPECTION . . . . . . . . . . . . . . . . 159 FIGURE 13: FUSELAGE - SKIN LAP JOINT - ZONE 2 INSPECTION. . . . . . . . . . . . . . . . . 162 FIGURE 14: FUSELAGE - SKIN LAP JOINT - ZONE 2 INSPECTION. . . . . . . . . . . . . . . . . 165 FIGURE 15: FUSELAGE - SKIN LAP JOINT - ZONE 2 INSPECTION. . . . . . . . . . . . . . . . . 168 FIGURE 16: FUSELAGE - STA 360 - CIRCUMFERENTIAL BUTT JOINT - INSPECTION . . . . . . 171 FIGURE 17: FUSELAGE - STA 887 - CIRCUMFERENTIAL BUTT JOINT - INSPECTION . . . . . . 173 FIGURE 18: FUSELAGE - STA 500E - CIRCUMFERENTIAL BUTT JOINT - INSPECTION . . . . . 175 FIGURE 19: FUSELAGE - STA 727I - CIRCUMFERENTIAL BUTT JOINT - INSPECTION . . . . . . 177 FIGURE 20: FUSELAGE - DECAL - ZONE 3, ZONE 4, ZONE 5 INSPECTION . . . . . . . . . . . . 179 FIGURE 21: FUSELAGE - DECAL - ZONE 6, ZONE 7, ZONE 8 INSPECTION . . . . . . . . . . . . 182 FIGURE 22: FUSELAGE - DECAL - ZONE 9, ZONE 10, ZONE 11 INSPECTION . . . . . . . . . . 185 FIGURE 23: FUSELAGE - DECAL - ZONE 12, ZONE 13, ZONE 14 INSPECTION . . . . . . . . . . 188 FIGURE 24: FUSELAGE - DECAL - ZONE 15, ZONE 16 INSPECTION . . . . . . . . . . . . . . . 191 FIGURE 25: FUSELAGE - EXTERNAL APPROVED REPAIRS - INSPECTIONS . . . . . . . . . . . 194 FIGURE 26: FUSELAGE - INTERNAL APPROVED REPAIRS - INSPECTION . . . . . . . . . . . . 196 FIGURE 27: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 17 198 FIGURE 28: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 17 200 FIGURE 29: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 17 202 FIGURE 30: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 17 204 FIGURE 31: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 17 206 FIGURE 32: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 18 208 FIGURE 33: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 18 210 FIGURE 34: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 18 212 FIGURE 35: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 18 214 FIGURE 36: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 18 216 FIGURE 37: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 19 218 FIGURE 38: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 19 220 FIGURE 39: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 19 222 FIGURE 40: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 19 224 FIGURE 41: FUSELAGE - SKIN LAP JOINT - LIMITED RETURN TO SERVICE PROGRAM - ZONE 19 226 FIGURE 42: FUSELAGE - CIRCUMFERENTIAL BUTT JOINT - STA 360 - LIMITED RETURN TO SERVICE PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228 FIGURE 43: FUSELAGE - CIRCUMFERENTIAL BUTT JOINT - STA 887 - LIMITED RETURN TO ### Page 5 Table of Contents Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 5 of 254 BOEING SERVICE BULLETIN 737-53A1289 SERVICE PROGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 FIGURE 44: FUSELAGE - CIRCUMFERENTIAL BUTT JOINT - STA 500E AND STA 727I - LIMITED RETURN TO SERVICE PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 232 FIGURE 45: EXTERNAL APPROVED REPAIRS - LIMITED RETURN TO SERVICE PROGRAM . . . 235 FIGURE 46: INTERNAL REPAIR DOUBLER - LIMITED RETURN TO SERVICE PROGRAM . . . . . 237 FIGURE 47: REQUIRED INSPECTIONS FOR SCRIBES FOUND WITHIN ONE INCH OF A SKIN LAP JOINT AND EXTERNAL APPROVED REPAIRS . . . . . . . . . . . . . . . . . . . . . 239 APPENDIX A: SEALANT REMOVAL PROCEDURE FOR EXTERIOR PRESSURIZED FUSELAGE SKIN 241 APPENDIX B: REPORTING SYSTEM - LIMITED RETURN TO SERVICE PROCEDURE FOR SCRIBE LINE AIRPLANES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 APPENDIX C: AIRPLANE FUSELAGE SCRIBE LINE MARK SUMMARY TABLES . . . . . . . . . . 250 APPENDIX D: SCRIBE LINE SAMPLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 ### Page 6 Table of Contents Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 6 of 254 BOEING SERVICE BULLETIN 737-53A1289 BLANK PAGE ### Page 7 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 254 Commercial Airplanes 737 Service Bulletin Number: 737-53A1289 Revision Transmittal Sheet Original Issue: January 14, 2009 Revision 1: November 18, 2009 ATA System: 5300 SUBJECT: FUSELAGE - Skin - Inspection Of The Skin For Scribe Lines 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 the original issue of this service bulletin. REASON FOR REVISION 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. This revision is sent to clarify requirements for inspections of areas of the fuselage having decals and to remove airplanes YL501-YL503 from the effectivity. These sections were changed: 1. Paragraph 1.A. Effectivity - removed airplanes YL501-YL503 2. Paragraph 1.E. Compliance - added additional inspection exception REVISION HISTORY Original Issue: January 14, 2009 Revision 1: November 18, 2009 ### Page 8 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 8 of 254 BOEING SERVICE BULLETIN 737-53A1289 BLANK PAGE ### Page 9 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9 of 254 Commercial Airplanes 737 Service Bulletin Number: 737-53A1289 Summary Original Issue: January 14, 2009 Revision 1: November 18, 2009 ATA System: 5300 SUBJECT: FUSELAGE - Skin - Inspection Of The Skin For Scribe Lines CONCURRENT REQUIREMENTS None. BACKGROUND This service bulletin gives instructions to inspect for scribe lines in the fuselage skin at lap joints, the splice strap at certain butt joints, the skin or doubler at certain approved repair doublers and the skin at decals. Fatigue cracks can develop at scribe line locations. Any crack that remains undetected could grow large and cause a rapid decompression. Nine operators have reported scribe line damage found adjacent to the skin lap joints, decals and wing to body fairings on 737-600, -700, -700C, -800, -900 airplanes. The scribe lines appear to have been made on the skin when sealant was removed as part of preparation of the airplane for repainting. One 737-700 operator reported scribe lines found around the wing to body fairing between stringer 26L and stringer 25R at station (STA) 727D to STA 727E. A second 737-700 operator reported six vertical scribe lines up to 42 inches long on the upper aft fuselage between stringer 5R and stringer 9R at STA 847 to STA 887. Another 737-700 operator reported scribe lines along stringer 24L and stringer 24R between STA 178 to STA 500B. The depth of the scribes ranged from 0.001inch to 0.004 inch. The airplanes had between 595 flight cycles and 17,571 flight cycles. No cracks as a result of scribe lines found on 737-600, -700, -700C, -800, -900 airplanes have been reported to Boeing. A scribe line is a narrow, shallow, distinct line of damage (typically up to 0.006 inch deep), usually associated with the removal of a fillet or gap seal (lap joints and butt joints, respectively). A more detailed definition of a scribe line is included in Accomplishment Instructions paragraph 3.B.7. Part 7 - Identification of a “Typical” Scribe Line. A review of fleet activity yields two separate scenarios that are suspected to have caused scribe lines to the fuselage skin or butt joint splice straps. The first scenario involves the paint stripping and repainting of airplanes. In the process of stripping and preparing the airplane for paint, tools were used to remove sealant and paint buildup at lap joints, butt joints, and at certain external or internal doublers or decals. Tools like scrapers (steel, wood, hard plastic etc.), knives, or utility knives can damage the skin, splice straps, or internal doublers. Fatigue cracks can develop at scribe line locations. ### Page 10 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 10 of 254 BOEING SERVICE BULLETIN 737-53A1289 The second scenario is graphic decal application on or removal from the fuselage. To install the decals across lap joint steps or repairs, investigation into maintenance practices has shown the decals have been cut in place, using some form of knife, to allow the decal to lie flush to the skin at these stepped locations. This operation results in scribe lines at the decal cut location. Based on service reports, sharp tools have also been used for close trimming of the decal’s outline. This type of decal trimming has also left scribe lines on the fuselage skin. The above maintenance operations can each lead to the same type of scribe line damage and subsequent premature fatigue cracks. Airplanes after line number 2309 are not included in the effectivity of this service bulletin because the Aircraft Maintenance Manual (AMM) procedure for paint/sealant removal has been revised. 737-800 series airplanes with a flat pressure bulkhead and 737-900ER series airplanes prior to line number 2310 are not included in the effectivity of this service bulletin. These airplanes have been verified as not being painted since delivery. Boeing Service Related Problem (SRP) 737NG-SRP-53-0245 is related to this service bulletin. ACTION At or before the scribe line inspection thresholds shown in this service bulletin, remove paint and sealant at the applicable zonal locations. Do an external detailed inspection of the skin, butt splice strap or approved repair doubler for any scribe line or any crack. If scribe lines are found, repair before further flight. As an alternative to immediate repair, for a scribe line that qualifies, the provided Limited Return to Service (LRTS) program may be used to allow airplanes to return to revenue flight for a limited period before scribe lines are repaired. This service bulletin contains a LRTS program. The LRTS program consists of repeat inspections to detect any crack where scribe lines were found. Total airplane flight cycles, location, and extent of scribe line must meet specific criteria in order for a scribe line to qualify for an LRTS program. Each affected structural location within an LRTS program will be terminated with a repair. This service bulletin has specific instructions for calculating separate inspection thresholds based on fatigue life for the identified locations. With the use of maintenance records, operators can implement the inspection program based on potential scribe line opportunities in an airplane’s maintenance history. If this maintenance records-based threshold program is not used, then 6,000 flight cycles shall be assigned as the cycle level when scribing occurred. Since a scribe line can occur at any time during the service life of an airplane and at many locations, this program uses both total flight cycles and structural criticality of location to determine the inspection requirements. Criticality of location allows this service bulletin to address the most critical areas first and to provide less critical areas with appropriately reduced compliance requirements. Criticality of location determines the inspection thresholds for each location. This service bulletin uses zones to address all of the critical locations and ranges of inspection thresholds. Each piece of structure susceptible to a scribe line is assigned to a zone. The affected structure in each zone (for each group of airplanes) is identified in individual figures in the service bulletin. EFFECTIVITY 737-600, -700, -700C, -800, -900 Airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes. ### Page 11 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 11 of 254 BOEING SERVICE BULLETIN 737-53A1289 COMPLIANCE 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. Refer to Paragraph 1.E., Compliance. INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection, and/or repair procedures given in this service bulletin. MANPOWER Refer to Paragraph 1.G., Manpower. MATERIAL INFORMATION Operator Supplied Parts/Materials. Refer to Paragraph 2.A., Material - Price and Availability. ### Page 12 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 12 of 254 BOEING SERVICE BULLETIN 737-53A1289 1016 STA360 STA TYPICAL AIRPLANE SHOWN DO AN EXTERNAL DETAILED INSPECTION FOR ANY SCRIBE LINE ALONG LAP JOINTS, CIRCUMFERENTIAL BUTT JOINT, APPROVED REPAIRS AND DECALS. IF A SCRIBE LINE IS FOUND, DO NDT INSPECTIONS FOR ANY CRACK. 727 STA 887 STA S-4L S-10L S-14L STA 360 STA 540 STA 727 STA 887 STA 1016 S-24L S-14L 1542468 ### Page 13 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 13 of 254 Commercial Airplanes 737 Service Bulletin Number: 737-53A1289 Original Issue: January 14, 2009 Revision 1: November 18, 2009 ATA System: 5300 SUBJECT: FUSELAGE - Skin - Inspection Of The Skin For Scribe Lines 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 - 737-600 Airplanes line number 1 through 871. 2 - 737-700 Airplanes line number 1 through 871. 3 - 737-800 Airplanes line number 1 through 871. 4 - 737-900 Airplanes line number 1 through 871. 5 - 737-700C Airplanes line number 1 through 871. 6 - 737-600 Airplanes line number 872 through 2309 with fatigue related design improvements in the upper lobe skin between stringers S-3 and S-4 and between S-9 and S-10. 7 - 737-700 Airplanes line number 872 through 2309 with fatigue related design improvements in the upper lobe skin between stringers S-3 and S-4 and between S-9 and S-10. ### Page 14 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 14 of 254 BOEING SERVICE BULLETIN 737-53A1289 Airplane models: 737-600 737-700 737-700C 737-800 737-900 IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER AEROLINEAS ARGENTINAS (ARG) 7Y N 1 0 4 AEROMEXICO (AMX) 7 YB207 YB851–YB863 YB871–YB874 YM501–YM503 YM506–YM512 8 YK580–YK584 AIR ALGERIE (ALG) 3 YD101–YD106 6 YE301–YE305 8 YD107–YD110 AIR BERLIN (BER) 2 YB201 3 YC053–YC068 YC151 YC391 YC461 YC701 YC703 YC705 7 YA356–YA357 YA614–YA615 YB203 8 YC069–YC070 YC730 YD151–YD157 YD159 YD218 YD261 YL023 AIR CHINA (BEJ) 2 YA681–YA682 3 YC943–YC947 YC981–YC983 7 YB584–YB588 YB590–YB598 8 YC948–YC951 YK161–YK165 YK651–YK657 YL001–YL005 8 - 737-800 Airplanes line number 872 through 2309 without a flat pressure bulkhead and with fatigue related design improvements in the upper lobe skin between stringers S-3 and S-4 and between S-9 and S-10, excluding line numbers 2095 and 2162. 9 - 737-900 Airplanes line number 872 through 2309 with fatigue related design improvements in the upper lobe skin between stringers S-3 and S-4 and between S-9 and S-10. 10 - 737-700C Airplanes line number 872 through 2309 with fatigue related design improvements in the upper lobe skin between stringers S-3 and S-4 and between S-9 and S-10. GROUP CONFIGURATION DESCRIPTION ### Page 15 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 15 of 254 BOEING SERVICE BULLETIN 737-53A1289 AIR CHINA CHONGQING BRANCH (CHO) 3 YC941–YC942 7Y B 5 8 9 AIR CHINA SOUTHWEST BRANCH (XIN) 8 YC426–YC428 AIR CHINA TIANJIN BRANCH (TJA) 7 YB581–YB583 AIR EUROPA (ARE) 3 YC761–YC770 YD046 YD048 8 YD206–YD209 YK002–YK003 YK361–YK367 YK370–YK371 YK602 AIR INDIA EXPRESS (IDC) 8 YJ942–YJ943 YK007 YK151–YK154 YL461–YL467 AIR ITALY (RIT) 8Y K 7 1 7 AIR MADAGASCAR (MAD) 2Y G 0 1 6 AIR NATIONAL GUARD (USK) 2 YG067 YG069 7Y G 0 4 4 AIR NIPPON (ANK) 7 YG251–YG252 YN001–YN011 AIR PACIFIC (APC) 2Y A 2 9 1 3 YC931–YC932 AIR SENEGAL INTERNATIONAL (SNG) 7 YM541 AIRCOMPANY YAKUTIA (SKK) 7Y B 9 1 1 AIRCRAFT MAINTENANCE CORP. (AMF) 8 YK631–YK633 AIRES S.A. (AIE) 2 YA573 YA575–YA576 7 YB114–YB115 AIRTRAN AIRWAYS (CQT) 7 YB371–YB392 YM201–YM203 YM205–YM207 YM209–YM221 YM223 YM226–YM228 ### Page 16 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 16 of 254 BOEING SERVICE BULLETIN 737-53A1289 ALASKA AIRLINES (ASA) 2 YA841–YA856 4 YD501–YD505 7 YA858 YA861–YA862 8 YK403 YK431–YK450 YL101 9 YD506–YD512 AMERICAN AIRLINES (AAL) 3 YC801–YC865 8 YC866–YC877 ARABASCO (RBS) 2Y G 0 2 9 ARAMCO ASSOCIATED COMPANY (RAS) 10 YG601–YG602 2 YB151–YB153 ARIK AIR (AKD) 2 YA627–YA629 7 YM224–YM225 ASTRAEUS, LTD. (AUA) 2 YA204 7 YA671–YA672 ATLANT-SOYUZ (AYZ) 3Y C 9 0 6 8 YC491–YC495 AUSTRALIAN WEDGETAIL PROGRAM (ZVI) 7 YG089 YG201 YG203–YG205 AUSTRIAN AIRLINES AG (AUL) 1 YE171–YE172 2 YB171 3 YC381–YC382 7 YB172 8 YC383–YC387 AVENIR WORLDWIDE (BBJ) LIMITED (AWO) 2Y G 0 3 4 AVIATION CAPITAL GROUP (CGP) 2 YA203 AVJET (AJT) 7Y G 0 7 9 Y G 0 9 5 BANCO SAFRA (BNS) 2Y G 0 4 0 ### Page 17 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 17 of 254 BOEING SERVICE BULLETIN 737-53A1289 BAVARIA (BAV) 7 YM581–YM582 BEL AIR LIMITED (ULL) 2Y G 0 2 2 BLUE AIR (BTR) 3 YC480–YC481 8Y J 9 3 4 BOEING DEMONSTRATOR JET (BCJ) 2 YG035–YG036 BOETTI AIR INC. (BBI) 2Y G 0 6 8 BURAQ AIR (BQA) 8 YK791–YK792 C.I.T. LEASING CORPORATION (TCI) 8 YC490 CANJET (CNJ) 3 YC476 YC478 YC903 8 YC488–YC489 CARIBBEAN AIRLINES LIMITED (CBL) 3 YC136–YC141 8 YD317 CELESTIAL AIRWAYS (LGM) 2Y G 0 6 2 CHARTWELL (CHP) 2Y G 0 1 7 CHINA AIRLINES (CHI) 3 YC571 YC574–YC581 8 YC582 CHINA EASTERN AIRLINES (CEA) 2 YA811–YA814 7 YB206 YB561–YB580 YM591–YM593 YN021 8 YK457–YK459 CHINA EASTERN AIRLINES WUHAN (WUH) 8 YD172 YK456 YK460 ### Page 18 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 18 of 254 BOEING SERVICE BULLETIN 737-53A1289 CHINA SOUTHERN AIRLINES (GUN) 3Y C 0 2 7 7 YB881–YB883 YB886–YB893 YN076–YN077 8 YC921–YC922 YD313 YD316 YD320 YD322 YD324–YD327 YD329 YJ671–YJ694 YL431–YL432 CHINA UNITED AIRLINES (CUL) 7 YB631–YB632 CHINA UNITED AIRLINES LTD. (CUA) 2 YA272 8Y D 4 9 6 Y D 4 9 9 CHINA XINJIANG AIRLINES (XIJ) 7 YA255–YA256 YA645 YA656 YB884–YB885 YM571–YM572 YN071–YN075 CIMBER AIR (CIM) 2 YA205–YA208 CLAY LACY AVIATION (CYA) 2Y G 0 3 7 COLOMBIAN AIR FORCE (CLB) 2Y G 0 2 8 COMMONWEALTH OF AUSTRALIA (GAU) 2Y G 0 7 2 Y G 0 7 5 CONTINENTAL AIRLINES (CAL) 2 YA501–YA536 3 YC321–YC380 4 YD601–YD602 8 YJ501–YJ517 YJ531–YJ558 9 YD603–YD612 COPA AIRLINES (COP) 2 YA755–YA756 YA961–YA966 7 YA967–YA978 8 YJ591–YJ594 CYPRUS TURKISH AIRLINES (KTHY) (KHT) 3 YC467 YD021–YD022 DALLAH ALBARAKA COMPANY (KAM) 2Y G 0 6 3 DELTA AIR LINES (DAL) 3 YC601–YC634 YC681–YC696 8 YC635–YC655 ### Page 19 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 19 of 254 BOEING SERVICE BULLETIN 737-53A1289 DOBRO LIMITED (DOB) 2Y G 0 0 8 DUBAI AIR WING (DAW) 2Y G 0 0 7 3 YD402 8 YD412 YD414 E & A AVIATION (RSB) 7Y G 0 8 2 EASTAR JET (ETJ) 1Y E 1 0 5 7 YB108 YB113 YB116 EASYJET (EZY) 2 YB101–YB103 7 YB106 YB117–YB132 EG&G TECHNICAL SERVICES (EGN) 6 YE201–YE206 EGYPTAIR (EGP) 8 YK981–YK982 EIE EAGLE (EIE) 8 YD409 EL AL ISRAEL AIRLINES (ELA) 2 YA881–YA882 3 YC405 YC591–YC593 8 YC147 YD219 ENERJET (ABQ) 7 YM204 YM208 ETHIOPIAN AIRLINES (ETH) 3 YD171 7 YA666–YA667 YB156–YB158 EUROCYPRIA AIRLINES (ECY) 8 YC186–YC190 YJ947 EVA AIR (EVA) 7Y G 0 8 3 EXPORT RESTRICTED AIRPLANES (YWV) 8 YD408 FEDERAL GOVERNMENT OF NIGERIA (NGA) 7Y G 0 9 1 ### Page 20 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 20 of 254 BOEING SERVICE BULLETIN 737-53A1289 FIRST VIRTUAL AIR II, LLC (FVA) 2Y G 0 0 1 FLYGLOBESPAN.COM (FGS) 7 YB671–YB672 8 YJ941 YJ976–YJ977 YK136–YK137 FTC (SEH) 7Y G 0 9 6 FUNAIR (FUN) 2Y G 0 2 7 FUTURA (FUA) 3Y C 4 6 4 G5 EXECUTIVE (GFE) 7Y G 1 1 7 GAMA AVIATION LTD (GAV) 2Y G 0 1 0 GARUDA INDONESIA (GIA) 3 YC482–YC485 YC727 8 YC436–YC437 YC486 YD319 YD323 YJ473 YJ475 YK601 GAZPROMAVIA (GAZ) 2 YA621–YA622 7Y G 0 9 7 GECAS (GEF) 7 YN102–YN103 YN105–YN106 YN110 GEORGIAN AIRWAYS (GEI) 7 YA860 GERMANIA (GER) 2 YA231 YA233 YA235–YA240 GLOBAL JET AUSTRIA (GLJ) 8Y D 4 0 4 GLOBAL JET LUXEMBOURG (SIQ) 2Y G 0 3 8 7Y G 0 9 3 ### Page 21 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 21 of 254 BOEING SERVICE BULLETIN 737-53A1289 GOL AIRLINES (GOT) 2 YA201–YA202 YA232 YA234 YA241–YA242 YA251–YA252 YA321–YA323 YA571–YA572 YA601–YA602 YA605 YA607–YA608 YA610–YA612 YA683–YA684 YA732–YA733 YB202 YB501 3 YC101 YC402–YC403 YC453 YC471–YC475 YC572–YC573 YC589 7 YA211 YA221 YA631 YA646–YA648 YA650 YA657 YB104–YB105 YB107 YB111–YB112 YB271 YB502 8 YC728–YC729 YD256–YD257 YD302–YD303 YD306–YD307 YJ471–YJ472 YJ944 YK721–YK723 YK725–YK733 GOVT OF EQUATORIAL GUINEA (EGR) 7Y G 0 8 5 HAINAN AIRLINES (HNA) 2 YA544 YA546 YA603–YA604 YA606 3 YC126–YC127 YC401 YC404 YC409 YC452 YC971–YC973 YD042–YD045 7 YA857 YA859 YB656 8 YC974–YC978 YD216 YK402 YK406 YK701–YK707 YK716 YL012–YL015 YL021–YL022 YL051–YL052 HAMBURG INTERNATIONAL (HAU) 2Y B 2 7 6 INDIAN AIR FORCE (IDF) 7Y G 1 1 2 INTEGRATED DEFENSE SYSTEMS (BSP) 7 YG202 YG212 YG214 INTERNATIONAL JETCLUB (IJC) 7Y G 1 1 6 IRAQI AIRWAYS (IRQ) 7 YM222 JEJU AIR (JJU) 3 YC410 YC704 YC707 JET AIRWAYS (JPL) 2 YA734 YA751–YA754 YB181 3 YC731 YC733–YC737 7 YA630 YB182–YB184 8 YC738–YC749 YD309 YD311–YD312 YD328 YD330 YD334 YK401 YK404 9 YD571–YD572 JET AVIATION AG - ZURICH (JTA) 2Y G 0 1 5 ### Page 22 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 22 of 254 BOEING SERVICE BULLETIN 737-53A1289 JET AVIATION BUSINESS JET INC (JBJ) 2Y G 0 7 1 JET LITE (JPQ) 2 YA253–YA254 3 YC462 YC901–YC902 7 YA351 YA367 YB651 YM102–YM103 8 YK141–YK142 YK576–YK577 JET4YOU.COM (JFU) 3Y C 0 1 0 8 YK908–YK909 JETAIRFLY (TLB) 2 YA609 8 YD217 YJ931 KAISERAIR, INC. (KAS) 2 YA685 KENYA AIRWAYS (KEN) 7 YA635–YA636 YA641–YA642 8 YL302–YL303 KLM - ROYAL DUTCH AIRLINES (KLM) 3 YC781–YC793 4Y D 5 3 1 8 YJ945 YK921 9 YD532–YD535 KOREAN AIR (KAL) 3 YC441–YC447 YC587 YD121–YD125 8 YC448 YD126 YL271–YL272 9 YD541–YD547 YD561–YD564 YD591–YD595 LAS VEGAS JET (LVJ) 2Y G 0 0 2 LIMITED BRAND INC. (LII) 2Y G 0 0 5 LOWA CORPORATION (LWA) 8Y D 4 0 6 LUXAIR (LUX) 7 YB901–YB903 MALAYSIA AIRLINES (MAS) 8 YC439 YK146–YK147 ### Page 23 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 23 of 254 BOEING SERVICE BULLETIN 737-53A1289 MALEV HUNGARIAN AIRLINES LTD. (HGA) 6 YE321–YE326 7 YA371–YA377 8 YC201–YC203 YC206–YC207 MGM MIRAGE (MGM) 7Y G 0 4 2 MIAMI AIR (MIB) 3 YC146 YC904–YC905 8 YD304 YK121–YK122 YK571 MID EAST JET (SKL) 2 YG013–YG014 YG021 8 YD407 MIDROC AVIATION (MDX) 8 YD405 MIDWEST AIRLINES (MWA) 1Y E 1 0 6 MONGOLIAN AIRLINES MIAT (MNG) 3 YC477 8Y J 4 7 6 MOSKOVIA AIR (MOK) 2Y A 7 3 1 N720CH, INC. (NCH) 2Y G 0 1 9 NATIONAL (NJI) 2Y G 0 3 2 NATIONAL AIR SERVICES (NAR) 3 YD403 7 YG080 YG086–YG087 NEOS (NEO) 8 YC438 YJ002 YJ021 YJ631–YJ632 NETJETS (NJL) 2 YG031 YG033 NEW AXIS AIRWAYS (NXA) 3 YC406 YC451 NEWS AMERICA INCORPORATED (NWS) 2Y G 0 2 0 NOFA LTD. (NFA) 8 YD413 ### Page 24 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 24 of 254 BOEING SERVICE BULLETIN 737-53A1289 NORWEGIAN AIR SHUTTLE ASA (NSB) 3Y C 4 1 2 Y C 4 5 5 8 YC907 YJ012–YJ013 YJ933 YK001 OJSC TAIMYR AIRLINES (TYM) 3Y C 1 0 3 8 YC028–YC029 OKAY AIRWAYS COMPANY LIMITED (OKY) 8 YD332–YD333 OMAN AIR (OMR) 7 YA366 YB551 8 YC171 YJ901–YJ903 ORENBURG AIRLINES (ORG) 3Y C 4 7 9 Y C 7 3 2 8 YC487 YD308 YD318 ORIENT GLOBAL AVIATION (VTU) 2Y G 0 1 1 PACIFIC BLUE AIRLINES (BLP) 8 YJ865–YJ866 YK321 YK324 YK326 YK328 YK332 PEGASUS AIRLINES (PGS) 3 YC392 YC466 YD025 8 YC414–YC415 YD391 YL061 PEROLUX S.A.R.L. (PLX) 7Y G 0 9 9 PICTON II (UNU) 2Y G 0 0 6 PRESIDENTIAL FLIGHT (ABD) 2Y G 0 3 9 8Y D 4 1 0 PRIME AVIATION KZ (PKZ) 2Y G 0 7 7 PRIMERA AIR (JXL) 2 YA302 3Y C 4 5 4 Y C 5 8 8 8 YJ001 YK138–YK139 PRIVATAIR (PTS) 2Y G 0 6 4 7Y G 0 9 2 8 YJ935–YJ936 YK006 ### Page 25 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 25 of 254 BOEING SERVICE BULLETIN 737-53A1289 QANTAS (QAN) 8 YC878–YC892 YJ911–YJ928 REPUBLIC OF CHINA AIR FORCE (CAF) 3 YC396 ROYAL AIR MAROC (RAM) 2 YA831–YA834 3 YC301–YC303 7 YA835 YN061 8 YC304–YC305 YK301–YK307 YK368–YK369 ROYAL JET (RJT) 2 YG018 YG023–YG026 ROYAL MALAYSIA AIR FORCE (MAF) 2Y G 0 6 1 ROYAL THAI AIR FORCE (TAF) 8Y K 4 7 6 RYANAIR (RYR) 8 YC496–YC499 YJ801–YJ860 YK801–YK848 S7 AIRLINES (SBR) 3 YD301 8 YD310 YD314–YD315 SAGA AIRLINES (SGV) 3 YC051–YC052 8 YD305 YD321 SAMSUNG TECHWIN CO. (SST) 7Y G 1 1 1 SAS (SAS) 1 YE001 YE003–YE005 YE007 YE009 YE011–YE012 YE016 YE018 YE020 YE051 YE101–YE104 YE107–YE109 3 YD047 YD049 YD051 YD082 8 YD052 YD055 YD057 SAS INSTITUTE INC. (SJS) 7Y G 0 4 1 SAS NORWAY (BRT) 1 YE002 YE006 YE008 YE010 YE013–YE015 YE017 YE019 2 YA311 YA543 YA545 YA547–YA550 YB001–YB006 3 YD041 YD050 YD081 YD083–YD084 7 YA551–YA552 YM671 8 YD053–YD054 YD056 ### Page 26 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 26 of 254 BOEING SERVICE BULLETIN 737-53A1289 SAUDI OGER (SAO) 2Y G 0 7 3 3Y D 4 0 1 SHANDONG AIRLINES (SHG) 7 YM551–YM553 8 YK511–YK514 YL066 YL311–YL312 SHANGHAI AIRLINES (SHA) 2 YA312–YA314 YA891–YA892 8 YC166–YC170 YC394 YD491–YD495 YD497–YD498 YJ003–YJ007 YJ871 SHENZHEN AIRLINES (SHZ) 2 YA626 YA686–YA687 YA721–YA722 YA801–YA803 3 YC153–YC154 YC411 YC413 7 YA613 YA809 8 YJ008 YJ948–YJ949 YK101–YK104 YK606–YK607 9 YD651–YD655 SIVA (SVM) 7Y G 0 9 4 SKY AIRLINES (SYC) 8Y J 9 5 0 SKYEUROPE (SKP) 7Y N 1 0 7 Y N 1 0 9 SKYMARK AIRLINES, INC. (SKM) 8 YK611–YK614 SOUTH AFRICAN AIRFORCE (SFF) 2Y G 0 7 6 SOUTH AFRICAN AIRWAYS (SAA) 3 YC708–YC715 YC720–YC723 YD023–YD024 8 YC724–YC725 YD481–YD485 SOUTHERN AIRCRAFT SERVICES (HUZ) 2Y G 0 0 9 SOUTHWEST AIRLINES (SWA) 2 YA001–YA099 YA271 YA301 YA541–YA542 7 YA101–YA199 YB204–YB205 YM251–YM299 YM301–YM328 SPICEJET (ROJ) 3Y C 4 6 5 8 YD331 YK641–YK642 YK941–YK945 STAR 1 AIRLINES UAB (UAB) 2 YA578 ### Page 27 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 27 of 254 BOEING SERVICE BULLETIN 737-53A1289 STERLING AIR (DSL) 2Y A 5 7 4 SUN COUNTRY AIRLINES (SCA) 3 YC104 YC121 YC152 7 YB109–YB110 8 YC155–YC156 YK132 SUNEXPRESS (SNS) 3 YC416–YC417 YC702 YC706 YD201–YD202 8 YD158 YJ477–YJ480 YK426–YK427 SUNWING AIRLINES INC. (SUG) 8 YJ946 YJ951 YK004 YL011 SWIFLITE AIRCRAFT CORPORATION (OSF) 7Y G 0 7 8 TAAG (ANGOLA AIRLINES) (ANG) 7 YM631–YM634 TAROM - ROMANIAN AIR TRANSPORT (TRM) 2 YB161–YB162 7 YB163–YB164 THOMSON AIRWAYS (BRI) 3 YD001–YD004 8 YK907 YL421–YL423 TOWN & COUNTRY FOODS INC. (RUF) 2Y G 0 0 3 TRACINDA CORP. (TRD) 2Y G 0 0 4 TRANSAERO AIRLINES (TRX) 3 YC006–YC007 TRANSAVIA AIRLINES (TAV) 3 YC071–YC082 7 YB521–YB526 YB541–YB544 8 YC083–YC084 YC091–YC094 TRANSAVIA FRANCE (TVF) 3 YC751–YC752 8 YK946–YK947 TRAVEL SERVICE (TSF) 3 YC408 YC459 8 YD203 YJ011 YJ474 YK005 YK131 YK166 YK405 ### Page 28 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 28 of 254 BOEING SERVICE BULLETIN 737-53A1289 TUIFLY (HAP) 2 YA577 3 YC001–YC005 YC008–YC009 YC011–YC026 7 YM641–YM644 8 YC030 YK901–YK906 TUIFLY NORDIC (TNS) 3Y D 0 0 5 8 YD006–YD007 TUNISAIR (TUN) 1 YE151–YE157 2 YA209–YA210 YG030 TURKISH AIR FORCE AEW&C PGM (ZXN) 7Y G 2 1 1 Y G 2 1 3 TURKISH AIRLINES (THY) 3 YC501–YC524 7 YM504–YM505 YN101 YN108 YN111–YN112 8 YC526 YK551–YK565 YL056 TURKMENISTAN AIRLINES (TUE) 8 YK796–YK797 TURNBERRY (TNY) 2Y G 0 1 2 TUTOR-SALIBA CORPORATION (TTS) 2Y G 0 7 0 TY AIR (YIP) 2Y G 0 6 6 UNITED STATES NAVY (USN) 10 YG505–YG509 5 YG501–YG504 US AIR FORCE (USF) 2Y G 0 7 4 7 YG081 YG084 YG088 USAF RESERVES (URV) 7 YG101–YG103 VIKING AIRLINES (VAI) 3 YC113 YC407 YC463 ### Page 29 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 29 of 254 BOEING SERVICE BULLETIN 737-53A1289 VIRGIN BLUE AIRLINES (VOZ) 2 YA336–YA338 3 YC421 7 YA339–YA345 YA649 YA658–YA659 YA688–YA691 YB208 YM101 YM521–YM522 8 YC393 YC422 YD251–YD254 YJ861–YJ864 YJ867 YJ932 YK111–YK112 YK322–YK323 YK325 YK327 YK329–YK331 YK333–YK334 VISION AIR (VEG) 3 YC102 WESTJET (WJI) 2Y B 3 0 1 6 YE371–YE383 7 YB302–YB310 YB601–YB630 YB961–YB967 8 YK480–YK484 WHITE SAPPHIRE (WSP) 7Y G 0 9 8 XIAMEN AIRLINES (XIA) 2 YA701–YA706 7 YA707–YA710 YM471 YM481–YM484 8 YK621–YK625 YK961–YK968 XL AIRWAYS GERMANY (SXL) 3 YC111–YC112 8 YK148 YL057 YEMENIA (YEM) 8 YC176–YC178 YONA (IOP) 7Y G 0 4 3 IDENTIFICATION BY VARIABLE NUMBER Variable Group YA001–YA099 2 YA101–YA199 7 YA201–YA210 2 YA211 7 YA221 7 YA231–YA242 2 YA251–YA254 2 YA255–YA256 7 YA271–YA272 2 YA291 2 ### Page 30 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 30 of 254 BOEING SERVICE BULLETIN 737-53A1289 YA301–YA302 2 YA311–YA314 2 YA321–YA323 2 YA336–YA338 2 YA339–YA345 7 YA351 7 YA356–YA357 7 YA366–YA367 7 YA371–YA377 7 YA501–YA536 2 YA541–YA550 2 YA551–YA552 7 YA571–YA578 2 YA601–YA612 2 YA613–YA615 7 YA621–YA622 2 YA626–YA629 2 YA630–YA631 7 YA635–YA636 7 YA641–YA642 7 YA645–YA650 7 YA656–YA659 7 YA666–YA667 7 YA671–YA672 7 YA681–YA687 2 YA688–YA691 7 YA701–YA706 2 YA707–YA710 7 YA721–YA722 2 YA731–YA734 2 YA751–YA756 2 YA801–YA803 2 YA809 7 YA811–YA814 2 YA831–YA834 2 YA835 7 YA841–YA856 2 YA857–YA862 7 YA881–YA882 2 Variable Group ### Page 31 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 31 of 254 BOEING SERVICE BULLETIN 737-53A1289 YA891–YA892 2 YA961–YA966 2 YA967–YA978 7 YB001–YB006 2 YB101–YB103 2 YB104–YB132 7 YB151–YB153 2 YB156–YB158 7 YB161–YB162 2 YB163–YB164 7 YB171 2 YB172 7 YB181 2 YB182–YB184 7 YB201–YB202 2 YB203–YB208 7 YB271 7 YB276 2 YB301 2 YB302–YB310 7 YB371–YB392 7 YB501 2 YB502 7 YB521–YB526 7 YB541–YB544 7 YB551 7 YB561–YB598 7 YB601–YB632 7 YB651 7 YB656 7 YB671–YB672 7 YB851–YB863 7 YB871–YB874 7 YB881–YB893 7 YB901–YB903 7 YB911 7 YB961–YB967 7 YC001–YC027 3 YC028–YC030 8 Variable Group ### Page 32 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 32 of 254 BOEING SERVICE BULLETIN 737-53A1289 YC051–YC068 3 YC069–YC070 8 YC071–YC082 3 YC083–YC084 8 YC091–YC094 8 YC101–YC104 3 YC111–YC113 3 YC121 3 YC126–YC127 3 YC136–YC141 3 YC146 3 YC147 8 YC151–YC154 3 YC155–YC156 8 YC166–YC171 8 YC176–YC178 8 YC186–YC190 8 YC201–YC203 8 YC206–YC207 8 YC301–YC303 3 YC304–YC305 8 YC321–YC382 3 YC383–YC387 8 YC391–YC392 3 YC393–YC394 8 YC396 3 YC401–YC413 3 YC414–YC415 8 YC416–YC417 3 YC421 3 YC422 8 YC426–YC428 8 YC436–YC439 8 YC441–YC447 3 YC448 8 YC451–YC455 3 YC459 3 YC461–YC467 3 YC471–YC485 3 Variable Group ### Page 33 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 33 of 254 BOEING SERVICE BULLETIN 737-53A1289 YC486–YC499 8 YC501–YC524 3 YC525–YC526 8 YC571–YC581 3 YC582–YC583 8 YC587–YC589 3 YC591–YC593 3 YC601–YC634 3 YC635–YC655 8 YC681–YC696 3 YC701–YC715 3 YC720–YC723 3 YC724–YC725 8 YC727 3 YC728–YC730 8 YC731–YC737 3 YC738–YC749 8 YC751–YC752 3 YC761–YC770 3 YC781–YC793 3 YC801–YC865 3 YC866–YC892 8 YC901–YC906 3 YC907 8 YC921–YC922 8 YC931–YC932 3 YC941–YC947 3 YC948–YC951 8 YC971–YC973 3 YC974–YC978 8 YC981–YC983 3 YD001–YD005 3 YD006–YD007 8 YD021–YD025 3 YD041–YD051 3 YD052–YD057 8 YD081–YD084 3 YD101–YD106 3 YD107–YD110 8 Variable Group ### Page 34 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 34 of 254 BOEING SERVICE BULLETIN 737-53A1289 YD121–YD125 3 YD126 8 YD151–YD159 8 YD171 3 YD172 8 YD201–YD202 3 YD203 8 YD206–YD209 8 YD216–YD219 8 YD251–YD254 8 YD256–YD257 8 YD261 8 YD301 3 YD302–YD334 8 YD391 8 YD401–YD403 3 YD404–YD410 8 YD412–YD414 8 YD481–YD485 8 YD491–YD499 8 YD501–YD505 4 YD506–YD512 9 YD531 4 YD532–YD535 9 YD541–YD547 9 YD561–YD564 9 YD571–YD572 9 YD591–YD595 9 YD601–YD602 4 YD603–YD612 9 YD651–YD655 9 YE001–YE020 1 YE051 1 YE101–YE109 1 YE151–YE157 1 YE171–YE172 1 YE201–YE206 6 YE301–YE305 6 YE321–YE326 6 Variable Group ### Page 35 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 35 of 254 BOEING SERVICE BULLETIN 737-53A1289 YE371–YE383 6 YG001–YG040 2 YG041–YG044 7 YG061–YG064 2 YG066–YG077 2 YG078–YG089 7 YG091–YG099 7 YG101–YG103 7 YG111–YG112 7 YG116–YG117 7 YG201–YG205 7 YG211–YG214 7 YG251–YG252 7 YG501–YG504 5 YG505–YG509 10 YG601–YG602 10 YJ001–YJ008 8 YJ011–YJ013 8 YJ021 8 YJ471–YJ480 8 YJ501–YJ517 8 YJ531–YJ558 8 YJ591–YJ594 8 YJ631–YJ632 8 YJ671–YJ694 8 YJ801–YJ867 8 YJ871 8 YJ901–YJ903 8 YJ911–YJ928 8 YJ931–YJ936 8 YJ941–YJ951 8 YJ976–YJ977 8 YK001–YK007 8 YK101–YK104 8 YK111–YK112 8 YK121–YK122 8 YK131–YK132 8 YK136–YK139 8 YK141–YK142 8 Variable Group ### Page 36 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 36 of 254 BOEING SERVICE BULLETIN 737-53A1289 YK146–YK148 8 YK151–YK154 8 YK161–YK166 8 YK301–YK307 8 YK321–YK334 8 YK361–YK371 8 YK401–YK406 8 YK426–YK427 8 YK431–YK450 8 YK456–YK460 8 YK476 8 YK480–YK484 8 YK511–YK514 8 YK551–YK565 8 YK571 8 YK576–YK577 8 YK580–YK584 8 YK601–YK602 8 YK606–YK607 8 YK611–YK614 8 YK621–YK625 8 YK631–YK633 8 YK641–YK642 8 YK651–YK657 8 YK701–YK707 8 YK716–YK717 8 YK721–YK733 8 YK791–YK792 8 YK796–YK797 8 YK801–YK848 8 YK901–YK909 8 YK921 8 YK941–YK947 8 YK961–YK968 8 YK981–YK982 8 YL001–YL005 8 YL011–YL015 8 YL021–YL023 8 YL051–YL052 8 Variable Group ### Page 37 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 37 of 254 BOEING SERVICE BULLETIN 737-53A1289 2. Spares Affected None. B. Concurrent Requirements None. YL056–YL057 8 YL061 8 YL066 8 YL101 8 YL271–YL272 8 YL301–YL303 8 YL311–YL312 8 YL421–YL423 8 YL431–YL432 8 YL461–YL467 8 YM101–YM103 7 YM201–YM228 7 YM251–YM299 7 YM301–YM328 7 YM471 7 YM481–YM484 7 YM501–YM512 7 YM521–YM522 7 YM541 7 YM551–YM553 7 YM571–YM572 7 YM581–YM582 7 YM591–YM593 7 YM631–YM634 7 YM641–YM644 7 YM671 7 YN001–YN011 7 YN021 7 YN061 7 YN071–YN077 7 YN101–YN112 7 Variable Group ### Page 38 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 38 of 254 BOEING SERVICE BULLETIN 737-53A1289 C. Reason This service bulletin gives instructions to inspect for scribe lines in the fuselage skin at lap joints, the splice strap at certain butt joints, the skin or doubler at certain approved repair doublers and the skin at decals. Fatigue cracks can develop at scribe line locations. Any crack that remains undetected could grow large and cause a rapid decompression. Nine operators have reported scribe line damage found adjacent to the skin lap joints, decals and wing to body fairings on 737-600, -700, -700C, -800, -900 airplanes. The scribe lines appear to have been made on the skin when sealant was removed as part of preparation of the airplane for repainting. One 737-700 operator reported scribe lines found around the wing to body fairing between stringer 26L and stringer 25R at station (STA) 727D to STA 727E. A second 737-700 operator reported six vertical scribe lines up to 42 inches long on the upper aft fuselage between stringer 5R and stringer 9R at STA 847 to STA 887. Another 737-700 operator reported scribe lines along stringer 24L and stringer 24R between STA 178 to STA 500B. The depth of the scribes ranged from 0.001inch to 0.004 inch. The airplanes had between 595 flight cycles and 17,571 flight cycles. No cracks as a result of scribe lines found on 737-600, -700, -700C, -800, -900 airplanes have been reported to Boeing. A scribe line is a narrow, shallow, distinct line of damage (typically up to 0.006 inch deep), usually associated with the removal of a fillet or gap seal (lap joints and butt joints, respectively). A more detailed definition of a scribe line is included in Accomplishment Instructions paragraph 3.B.7. Part 7 - Identification of a “Typical” Scribe Line. A review of fleet activity yields two separate scenarios that are suspected to have caused scribe lines to the fuselage skin or butt joint splice straps. The first scenario involves the paint stripping and repainting of airplanes. In the process of stripping and preparing the airplane for paint, tools were used to remove sealant and paint buildup at lap joints, butt joints, and at certain external or internal doublers or decals. Tools like scrapers (steel, wood, hard plastic etc.), knives, or utility knives can damage the skin, splice straps, or internal doublers. Fatigue cracks can develop at scribe line locations. The second scenario is graphic decal application on or removal from the fuselage. To install the decals across lap joint steps or repairs, investigation into maintenance practices has shown the decals have been cut in place, using some form of knife, to allow the decal to lie flush to the skin at these stepped locations. This operation results in scribe lines at the decal cut location. Based on service reports, sharp tools have also been used for close trimming of the decal’s outline. This type of decal trimming has also left scribe lines on the fuselage skin. The above maintenance operations can each lead to the same type of scribe line damage and subsequent premature fatigue cracks. Airplanes after line number 2309 are not included in the effectivity of this service bulletin because the Aircraft Maintenance Manual (AMM) procedure for paint/sealant removal has been revised. 737-800 series airplanes with a flat pressure bulkhead and 737-900ER series airplanes prior to line number 2310 are not included in the effectivity of this service bulletin. These airplanes have been verified as not being painted since delivery. Boeing Service Related Problem (SRP) 737NG-SRP-53-0245 is related to this service bulletin. Revision 01 is sent to clarify requirements for inspections of areas of the fuselage having decals and to remove airplanes YL501-YL503 from the effectivity. ### Page 39 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 39 of 254 BOEING SERVICE BULLETIN 737-53A1289 D. Description At or before the scribe line inspection thresholds shown in this service bulletin, remove paint and sealant at the applicable zonal locations. Do an external detailed inspection of the skin, butt splice strap or approved repair doubler for any scribe line or any crack. If scribe lines are found, repair before further flight. As an alternative to immediate repair, for a scribe line that qualifies, the provided Limited Return to Service (LRTS) program may be used to allow airplanes to return to revenue flight for a limited period before scribe lines are repaired. This service bulletin contains a LRTS program. The LRTS program consists of repeat inspections to detect any crack where scribe lines were found. Total airplane flight cycles, location, and extent of scribe line must meet specific criteria in order for a scribe line to qualify for an LRTS program. Each affected structural location within an LRTS program will be terminated with a repair. This service bulletin has specific instructions for calculating separate inspection thresholds based on fatigue life for the identified locations. With the use of maintenance records, operators can implement the inspection program based on potential scribe line opportunities in an airplane’s maintenance history. If this maintenance records-based threshold program is not used, then 6,000 flight cycles shall be assigned as the cycle level when scribing occurred. Since a scribe line can occur at any time during the service life of an airplane and at many locations, this program uses both total flight cycles and structural criticality of location to determine the inspection requirements. Criticality of location allows this service bulletin to address the most critical areas first and to provide less critical areas with appropriately reduced compliance requirements. Criticality of location determines the inspection thresholds for each location. This service bulletin uses zones to address all of the critical locations and ranges of inspection thresholds. Each piece of structure susceptible to a scribe line is assigned to a zone. The affected structure in each zone (for each group of airplanes) is identified in individual figures in the service bulletin. Revision 01 - No more work is necessary on airplanes inspected as shown in the original issue of this service bulletin. E. Compliance 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. For airplanes which have incorporated Boeing Business Jet (BBJ) Lower Cabin Altitude Supplemental Type Certificate (STC) ST01697SE (6500 feet maximum cabin altitude in lieu of 8000 feet) as referenced in Boeing Service Bulletin 737-21-1149, the flight cycle related compliance times are different from those specified in this service bulletin. All initial compliance times (thresholds) specified in flight cycles must be reduced to half of those specified in this service bulletin. All repeat interval compliance times specified in flight cycles must be reduced to one-quarter of those specified in this service bulletin. 1. Inspection Exceptions: Certain inspections are not required under these conditions: ### Page 40 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 40 of 254 BOEING SERVICE BULLETIN 737-53A1289 a. If operator’s records show that the airplane has never been stripped or repainted since delivery from Boeing, or the airplane was stripped or repainted after the date of July 1, 2007, then the lap joint, butt joint, repair and decal inspections are not required. b. If the operator’s records show the airplane has never had decals installed since delivery, or decals have been installed after the date of July 1, 2007 then the decal area inspections are not required. c. For each repair, if the operator’s records show that the airplane has never been stripped or repainted since the repair has been installed, or the repair was installed after the date of July 1, 2007, then the repair inspections for that specific repair are not required. d. If the operator’s records show that the airplane has never been stripped or repainted under the wing-to-body fairings since delivery from Boeing, or the airplane was stripped or repainted under the wing-to-body fairings after the date of July 1, 2007, then the lap joint and repair inspections in the areas under the wing-to-body fairing are not required. e. If the operator's records show that the removal of sealant at all times since delivery has been accomplished in accordance with the sealant removal process as shown in Appendix A of this service bulletin, or sealant was removed after the date of July 1, 2007, then the lap joint, butt joint and repair inspections are not required. f. If the operator's records show that decal installation and removal procedures were used, at all times since delivery, which included pre-cutting decals prior to installation on the airplane and no use of metallic tooling of any kind during the installation or removal of decals on the airplane, then the inspections per Tables 5 through 9 are not required. Group 1-5: Table 1: Skin Lap Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) All airplanes. Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions paragraph 3.B.1. Part 1 - Skin Lap Joint - Zone 1 Inspection. Before 40,000 total flight cycles plus first scribe line opportunity.(a) Within 4,000 flight cycles after the date on this service bulletin. - All Airplanes Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.2. Part 2 - Skin Lap Joint - Zone 2 inspection. Before 50,000 total flight cycles plus first scribe line opportunity.(a) Within 4,000 flight cycles after the date on this service bulletin. - No scribe line is found. (b) No further inspections are required.(c) --- Any scribe line is found. (b) Do an external detailed inspection and a laser measurement inspection to determine the scribe line depth in accordance with Accomplishment Instructions Paragraph 3.B.8. Part 8 - Scribe Line Found.(d) Before further flight. -- ### Page 41 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 41 of 254 BOEING SERVICE BULLETIN 737-53A1289 Scribe line is found less than 0.001 inch deep.(b) No further inspections are required.(c) Before further flight. -- Scribe line is found before the Zone 1 or Zone 2 threshold was reached, and is within the limits of a typical scribe line. (b) Do a High Frequency Eddy Current (HFEC) inspection and Ultrasonic (UT) inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.12. Part 12 - Inspection Requirements for Scribes Found Prior to the Initial Inspection Threshold. Before further flight. -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the lap joint in Zone 1 and is within limits of a typical scribe line. (b) Do a HFEC inspection and UT inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.9. Part 9 - Scribe Line Inspection. Before 40,000 total flight cycles plus first scribe line opportunity.(a) -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the lap joint in Zone 2 and is within limits of a typical scribe line. (b) Do a HFEC inspection and UT inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.9. Part 9 - Scribe Line Inspection. Before 50,000 total flight cycles plus first scribe line opportunity.(a) -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found not within the limits of a typical scribe line. (b) Contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to a lap joint in Zone 1 that is within the limits of a typical scribe line with no crack indication. (b) In Zone 17 do an external detailed inspection, HFEC inspection and UT inspection or UT phased array inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10.a. Part 10 - LRTS program inspection.(e) Before 40,000 total flight cycles. Within 3,000 flight cycles after the scribe line is found. 3,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Group 1-5: Table 1: Skin Lap Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 42 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 42 of 254 BOEING SERVICE BULLETIN 737-53A1289 Scribe line is found common to a lap joint in Zone 2 that is within the limits of a typical scribe line with no crack indication. (b) In Zone 18 do an external detailed inspection, HFEC inspection and UT inspection or UT phased array inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10.b. Part 10 -LRTS program inspection.(e) Before 50,000 total flight cycles. Within 4,000 flight cycles after the scribe line is found. 4,000 flight cycles. In Zone 19 do an external detailed inspection, HFEC inspection and UT inspection or UT phased array inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10.c. Part 10 -LRTS program inspection.(e) Before 50,000 total flight cycles. Within 3,000 flight cycles after the scribe line is found. 3,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- If any crack is found. Contact Boeing for repair instructions and do the repair. Before further flight. -- All airplanes with scribe line using a LRTS program inspection. Contact Boeing for additional inspections or repair. Before 75,000 total flight cycles. -- (a) First scribe line opportunity is provided by maintenance records. Adjust the compliance time as given below: 1. If record of first paint since delivery is available, then add the airplane flight cycles at first paint to the threshold. 2. If record of first paint since delivery is not available, add 6,000 flight cycles to the threshold. (b) Refer to Accomplishment Instructions Paragraph 3.B.7. Part 7 - for definition of a typical scribe line. (c) No further inspections are required at this location, provided that the correct sealant removal procedure is used for all future work. Refer to Appendix A of this service bulletin as an accepted sealant removal procedure. (d) As an alternative, an optical micrometer may be used to determine scribe depth greater than 0.001 inch. (e) As an option, an UT phased array inspection can be used to replace the UT inspection. Group 1-5: Table 1: Skin Lap Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 43 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 43 of 254 BOEING SERVICE BULLETIN 737-53A1289 Group 6-10: Table 2: Skin Lap Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) All airplanes. Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions paragraph 3.B.1. Part 1 - Skin Lap Joint - Zone 1 Inspection. Before 50,000 total flight cycles plus first scribe line opportunity. (a) Within 4,000 flight cycles after the date on this service bulletin. - No scribe line or damage is found. (b) No further inspections are required.(c) --- Any scribe line is found. (b) Do an external detailed inspection and a laser measurement inspection to determine the scribe line depth in accordance with Accomplishment Instructions Paragraph 3.B.8. Part 8 - Scribe Line Found.(d) Before further flight. -- Scribe line is found less than 0.001 inch deep.(b) No further inspections are required.(c) Before further flight. -- Scribe line is found before the Zone 1 threshold was reached, and is within the limits of a typical scribe line. (b) Do a High Frequency Eddy Current (HFEC) inspection and Ultrasonic (UT) inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.12. Part 12 - Inspection Requirements for Scribes Found Prior to the Initial Inspection Threshold. Before further flight. -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the lap joint in Zone 1 and is within limits of a typical scribe line. (b) Do a HFEC inspection and UT inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.9. Part 9 - Scribe Line Inspection. Before 50,000 total flight cycles plus first scribe line opportunity.(a) -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found not within the limits of a typical scribe line. (b) Contact Boeing for repair instructions and do the repair. Before further flight. -- ### Page 44 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 44 of 254 BOEING SERVICE BULLETIN 737-53A1289 Scribe line is found common to a lap joint in Zone 1 that is within the limits of a typical scribe line with no crack indication. (b) in Zone 17 do an external detailed inspection, HFEC inspection and UT inspection or UT phased array inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10.a. Part 10 - LRTS program inspection.(e) Before 50,000 total flight cycles. Within 4,000 flight cycles after the scribe line is found. 4,000 flight cycles. In Zone 18 do an external detailed inspection, HFEC inspection and UT inspection or UT phased array inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10.b. Part 10 -LRTS program inspection.(e) Before 50,000 total flight cycles. Within 4,000 flight cycles after the scribe line is found. 4,000 flight cycles. In Zone 19 do an external detailed inspection, HFEC inspection and UT inspection or UT phased array inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10.c. Part 10 -LRTS program inspection.(e) Before 50,000 total flight cycles. Within 3,000 flight cycles after the scribe line is found. 3,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- If any crack is found. Contact Boeing for repair instructions and do the repair. Before further flight. -- All airplanes with scribe line using a LRTS program inspection. Contact Boeing for additional inspections or repair. Before 75,000 total flight cycles. -- (a) First scribe line opportunity is provided by maintenance records. Adjust the compliance time as given below: 1. If record of first paint since delivery is available, then add the airplane flight cycles at first paint to the threshold. 2. If record of first paint since delivery is not available, add 6,000 flight cycles to the threshold. (b) Refer to Accomplishment Instructions Paragraph 3.B.7. Part 7 - for definition of a typical scribe line. (c) No further inspections are required at this location, provided that the correct sealant removal procedure is used for all future work. Refer to Appendix A of this service bulletin as an accepted sealant removal procedure. (d) As an alternative, an optical micrometer may be used to determine scribe depth greater than 0.001 inch. (e) As an option, an UT phased array inspection can be used to replace the UT inspection Group 6-10: Table 2: Skin Lap Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 45 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 45 of 254 BOEING SERVICE BULLETIN 737-53A1289 Group 1-3, 5-8, 10: Table 3: Circumferential Butt Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) All Airplanes. Do an external detailed inspection of circumferential butt joint STA 887 between S-10L and S-10R for any scribe line in accordance with the Accomplishment Instructions Paragraph 3.B.3. Part 3- Circumferential Butt Joint - Inspection. Before 40,000 total flight cycles plus first scribe line opportunity. (a) Within 4,000 flight cycles after the date on this service bulletin. - All Airplanes. Do an external detailed inspection of circumferential butt joint STA 360 between S-10L and S-10R for any scribe line in accordance with the Accomplishment Instructions Paragraph 3.B.3. Part 3 - Circumferential Butt Joint - Inspection. Before 45,000 total flight cycles plus first scribe line opportunity. (a) Within 4,000 flight cycles after the date on this service bulletin. - No scribe line is found. No further inspections are required.(b) --- Any scribe line is found. (c) Do an external detailed inspection and a laser measurement inspection to determine the scribe line depth in accordance with Accomplishment Instructions Paragraph 3.B.8. Part 8 - Scribe Line Found.(d) Before further flight. -- Scribe line is found less than 0.001 inch deep. (c) No further inspections are required. (b) Before further flight. -- Scribe line is found within the limits of a typical scribe line. (c) Do an external LFEC sliding probe inspection or an internal MFEC inspection or an external HFEC pencil probe inspection or an internal HFEC inspection for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.9. Part 9 - Scribe Line Inspection.(e) Before further flight. -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found not within the limits of a typical scribe line. (c) Contact Boeing for repair instructions and do the repair. Before further flight. -- ### Page 46 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 46 of 254 BOEING SERVICE BULLETIN 737-53A1289 Scribe line is found common to circumferential butt joint at STA 360 that is within the limits of a typical scribe line with no crack indication. (c) Do an external LFEC sliding probe inspection or an internal MFEC inspection or an external HFEC pencil probe inspection or an internal HFEC inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10.d. Part 10 - LRTS program Circumferential Butt Joint - repeat inspection.(e) Before 45,000 total flight cycles. Within 7,000 flight cycles after the scribe line is found. 7,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to circumferential butt joint at STA 887 that is within the limits of a typical scribe line with no crack indication. (c) Do an external LFEC sliding probe inspection or an internal MFEC inspection or an external HFEC pencil probe inspection or an internal HFEC inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10.d. Part 10 - LRTS program Circumferential Butt Joint - repeat inspection.(e) Before 40,000 total flight cycles. Within 6,000 flight cycles after the scribe line is found. 6,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- If any crack is found. Contact Boeing for repair instructions and do the repair. Before further flight. -- All airplanes with scribe line using a LRTS program inspection. Contact Boeing for additional inspections or repair. Before 75,000 total flight cycles. -- (a) First scribe line opportunity is provided by maintenance records. Adjust the compliance time as given below: 1. If record of first paint since delivery is available, then add the airplane cycles at first paint to the threshold. 2. If record of first paint since delivery is not available, add 6,000 flight cycles to the threshold. (b) No further inspections are required at this location, provided that the correct sealant removal procedure is used for all future work. Refer to Appendix A of this service bulletin as an accepted sealant removal procedure. (c) Refer to Accomplishment Instructions Paragraph 3.B.7. Part 7 - for definition of a typical scribe line. (d) As an alternative, an optical micrometer may be used to determine scribe depth greater than 0.001 inch. (e) If internal MFEC or internal HFEC inspections are used, the areas of the splice plate covered by production stringers, shear ties, or production internal splice plates do not require eddy current inspections. Group 1-3, 5-8, 10: Table 3: Circumferential Butt Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 47 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 47 of 254 BOEING SERVICE BULLETIN 737-53A1289 Group 4, 9: Table 4: Circumferential Butt Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) All Airplanes. Do an external detailed inspection of circumferential butt joint STA 727I between S-10L and S-10R for any scribe line in accordance with the Accomplishment Instructions Paragraph 3.B.3. Part 3- Circumferential Butt Joint - Inspection. Before 14,000 total flight cycles plus first scribe line opportunity.(a) Within 4,000 flight cycles after the date on this service bulletin. - All Airplanes. Do an external detailed inspection of circumferential butt joint STA 500E between S-10L and S-10R for any scribe line in accordance with the Accomplishment Instructions Paragraph 3.B.3. Part 3- Circumferential Butt Joint - Inspection. Before 30,000 total flight cycles plus first scribe line opportunity.(a) Within 4,000 flight cycles after the date on this service bulletin. - All Airplanes. Do an external detailed inspection of circumferential butt joint STA 887 between S-10L and S-10R for any scribe line in accordance with the Accomplishment Instructions Paragraph 3.B.3. Part 3- Circumferential Butt Joint - Inspection. Before 40,000 total flight cycles plus first scribe line opportunity.(a) Within 4,000 flight cycles after the date on this service bulletin. - All Airplanes. Do an external detailed inspection of circumferential butt joint STA 360 between S-10L and S-10R for any scribe line in accordance with the Accomplishment Instructions Paragraph 3.B.3. Part 3- Circumferential Butt Joint - Inspection. Before 45,000 total flight cycles plus first scribe line opportunity.(a) Within 4,000 flight cycles after the date on this service bulletin. - No scribe line is found. No further inspections are required.(b) - - - Any scribe line is found. (c) Do an external detailed inspection and a laser measurement inspection to determine the scribe line depth in accordance with Accomplishment Instructions Paragraph 3.B.8. Part 8 - Scribe Line Found. (d) Before further flight. -- Scribe line is found less than 0.001 inch deep. (c) No further inspections are required. (b) Before further flight. -- ### Page 48 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 48 of 254 BOEING SERVICE BULLETIN 737-53A1289 Scribe line is found within the limits of a typical scribe line . (c) Do an external LFEC sliding probe inspection or an internal MFEC inspection or an external HFEC pencil probe inspection or an internal HFEC inspection for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.9. Part 9 - Scribe Line Inspection.(e) Before further flight. -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found not within the limits of a typical scribe line. (c) Contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to circumferential butt joint STA 360 that is within the limits of a typical scribe line with no crack indication. (c) Do an external LFEC sliding probe inspection or an internal MFEC inspection or an external HFEC pencil probe inspection or an internal HFEC inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program Circumferential Butt Joint - repeat inspection.(e) Before 45,000 total flight cycles. Within 7,000 flight cycles after the scribe line is found. 7,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to circumferential butt joint STA 887 that is within the limits of a typical scribe line with no crack indication. (c) Do an external LFEC sliding probe inspection or an internal MFEC inspection or an external HFEC pencil probe inspection or an internal HFEC inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program Circumferential Butt Joint - repeat inspection.(e) Before 40,000 total flight cycles. Within 6,000 flight cycles after the scribe line is found. 6,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Group 4, 9: Table 4: Circumferential Butt Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 49 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 49 of 254 BOEING SERVICE BULLETIN 737-53A1289 Scribe line is found common to circumferential butt joint STA 500E that is within the limits of a typical scribe line with no crack indication. (c) Do an external LFEC sliding probe inspection or an internal MFEC inspection or an external HFEC pencil probe inspection or an internal HFEC inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program Circumferential Butt Joint - repeat inspection.(e) Before 30,000 total flight cycles. Within 3,000 flight cycles after the scribe line is found. 3,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to circumferential butt joint STA 727I that is within the limits of a typical scribe line with no crack indication. (c) Do an external LFEC sliding probe inspection or an internal MFEC inspection or an external HFEC pencil probe inspection or an internal HFEC inspection of the scribe line for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program Circumferential Butt Joint - repeat inspection.(e) Before 14,000 total flight cycles. Within 3,000 flight cycles after the scribe line is found. 3,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- If any crack is found. Contact Boeing for repair instructions and do the repair. Before further flight. -- All airplanes with scribe line using a LRTS program inspection. Contact Boeing for additional inspections or repair. Before 75,000 total flight cycles. -- (a) First scribe line opportunity is provided by maintenance records. Adjust the compliance time as given below: 1. If record of first paint since delivery is available, then add the airplane cycles at first paint to the threshold. 2. If record of first paint since delivery is not available, add 6,000 flight cycles to the threshold. (b) No further inspections are required at this location, provided that the correct sealant removal procedure is used for all future work. Refer to Appendix A of this service bulletin as an accepted sealant removal procedure. (c) Refer to Accomplishment Instructions Paragraph 3.B.7. Part 7 - for definition of a typical scribe line. (d) As an alternative, an optical micrometer may be used to determine scribe depth greater than 0.001 inch. (e) If internal MFEC or internal HFEC inspections are used, the areas of the splice plate covered by production stringers, shear ties, or production internal splice plates do not require eddy current inspections. Group 4, 9: Table 4: Circumferential Butt Joint - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 50 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 50 of 254 BOEING SERVICE BULLETIN 737-53A1289 Group 1, 6: Table 5: Decal Zone 3, Zone 4, Zone 5, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) Decal Installed in Zone 3. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 60,000 total flight cycles plus first scribe line opportunity.(b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 60,000 total flight cycles plus first scribe line opportunity.(b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) Decal Installed in Zone 4. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 40,000 total flight cycles plus first scribe line opportunity.(b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 40,000 total flight cycles plus first scribe line opportunity.(b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) Decal Installed in Zone 5. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 25,000 total flight cycles plus first scribe line opportunity.(b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 25,000 total flight cycles plus first scribe line opportunity.(b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) No scribe line is found. (d) No further inspections are required.(e) - - - ### Page 51 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 51 of 254 BOEING SERVICE BULLETIN 737-53A1289 Any scribe line is found. (d) Do an external detailed inspection and a laser measurement inspection to determine the scribe line depth in accordance with Accomplishment Instructions Paragraph 3.B.8. Part 8 - Scribe Line Found.(f) Before further flight. -- Scribe line is found less than 0.001 inch deep. (d) No further inspections are required. (e) Before further flight. -- Scribe line is found within the limits of a typical scribe line. (d) Do a HFEC inspection for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.9. Part 9 - Scribe Line Inspection. Before further flight. -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found not within the limits of a typical scribe line. (d) Contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 3 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 3 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection.(a) Before 60,000 total flight cycles. Within 10,000 flight cycles after the scribe line is found. 10,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 4 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 4 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection.(a) Before 40,000 total flight cycles. Within 5,000 flight cycles after the scribe line is found. 5,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 5 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 5 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection.(a) Before 25,000 total flight cycles. Within 2,500 flight cycles after the scribe line is found. 2,500 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Group 1, 6: Table 5: Decal Zone 3, Zone 4, Zone 5, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 52 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 52 of 254 BOEING SERVICE BULLETIN 737-53A1289 If any crack is found. Contact Boeing for repair instructions and do the repair. Before further flight. -- All airplanes with scribe line using a LRTS program inspection. Contact Boeing for additional inspections or repair. Before 75,000 total flight cycles. -- (a) Refer to Figure 20 of this service bulletin for definition of Zones 3, 4 and 5. (b) First scribe line opportunity is provided by maintenance records. Adjust the compliance time as given below: 1. If record of first decal installation since delivery is available, then add the airplane flight cycles at first decal installation to the threshold. 2. If record of first decal installation since delivery is not available, add 6,000 flight cycles to the threshold. (c) Accomplishment of the detailed inspection is terminating action for the general visual repeat inspections. (d) Refer to Accomplishment Instructions Paragraph 3.B.7. Part 7 - for definition of a typical scribe line. (e) No further inspections are required at this location. (f) As an alternative, an optical micrometer may be used to determine scribe depth greater than 0.001 inch. Group 2, 7: Table 6: Decal Zone 6, Zone 7, Zone 8, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) Decal Installed in Zone 6. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 60,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 60,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles. (c) Group 1, 6: Table 5: Decal Zone 3, Zone 4, Zone 5, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 53 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 53 of 254 BOEING SERVICE BULLETIN 737-53A1289 Decal Installed in Zone 7. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 40,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 40,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles. (c) Decal Installed in Zone 8. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 25,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 25,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles. (c) No scribe line is found. (d) No further inspections are required.(e) - - - Any scribe line is found. (d) Do an external detailed inspection and a laser measurement inspection to determine the scribe line depth in accordance with Accomplishment Instructions Paragraph 3.B.8. Part 8 - Scribe Line Found.(f) Before further flight. -- Scribe line is found less than 0.001 inch deep. (d) No further inspections are required. (e) Before further flight. -- Scribe line is found within the limits of a typical scribe line. (d) Do a HFEC inspection for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.9. Part 9 - Scribe Line Inspection. Before further flight. -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Group 2, 7: Table 6: Decal Zone 6, Zone 7, Zone 8, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 54 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 54 of 254 BOEING SERVICE BULLETIN 737-53A1289 Scribe line is found not within the limits of a typical scribe line. (d) Contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 6 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 6 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection. (a) Before 60,000 total flight cycles. Within 10,000 flight cycles after the scribe line is found. 10,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 7 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 7 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection. (a) Before 40,000 total flight cycles. Within 5,000 flight cycles after the scribe line is found. 5,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 8 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 8 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection.(a) Before 25,000 total flight cycles. Within 2,500 flight cycles after the scribe line is found. 2,500 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- If any crack is found. Contact Boeing for repair instructions and do the repair. Before further flight. -- All airplanes with scribe line using a LRTS program inspection. Contact Boeing for additional inspections or repair. Before 75,000 total flight cycles. -- (a) Refer to Figure 21 of this service bulletin for definition of Zones 6, 7 and 8. (b) First scribe line opportunity is provided by maintenance records. Adjust the compliance time as given below: 1. If record of first decal installation since delivery is available, then add the airplane flight cycles at first decal installation to the threshold. 2. If record of first decal installation since delivery is not available, add 6,000 flight cycles to the threshold. (c) Accomplishment of the detailed inspection is terminating action for the general visual repeat inspections. Group 2, 7: Table 6: Decal Zone 6, Zone 7, Zone 8, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 55 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 55 of 254 BOEING SERVICE BULLETIN 737-53A1289 (d) Refer to Accomplishment Instructions Paragraph 3.B.7. Part 7 - for definition of a typical scribe line. (e) No further inspections are required at this location. (f) As an alternative, an optical micrometer may be used to determine scribe depth greater than 0.001 inch. Group 3, 8: Table 7: Decal Zone 9, Zone 10, Zone 11, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) Decal Installed in Zone 9. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection Or Before 60,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 60,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) Decal Installed in Zone 10. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 40,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 40,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) Decal Installed in Zone 11. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 25,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 25,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) Group 2, 7: Table 6: Decal Zone 6, Zone 7, Zone 8, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 56 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 56 of 254 BOEING SERVICE BULLETIN 737-53A1289 No scribe line is found. (d) No further inspections are required.(e) - - - Any scribe line is found. (d) Do an external detailed inspection and a laser measurement inspection to determine the scribe line depth in accordance with Accomplishment Instructions Paragraph 3.B.8. Part 8 - Scribe Line Found.(f) Before further flight. -- Scribe line is found less than 0.001 inch deep. (d) No further inspections are required. (e) Before further flight. -- Scribe line is found within the limits of a typical scribe line. (d) Do a HFEC inspection for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.9. Part 9 - Scribe Line Inspection. Before further flight. -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found not within the limits of a typical scribe line. (d) Contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 9 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 9 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection. (a) Before 60,000 total flight cycles. Within 10,000 flight cycles after the scribe line is found. 10,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 10 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 10 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection. (a) Before 40,000 total flight cycles. Within 5,000 flight cycles after the scribe line is found. 5,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Group 3, 8: Table 7: Decal Zone 9, Zone 10, Zone 11, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 57 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 57 of 254 BOEING SERVICE BULLETIN 737-53A1289 Scribe line is found common to the decals in Zone 11 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 11 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with the Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection. (a) Before 25,000 total flight cycles. Within 2,500 flight cycles after the scribe line is found. 2,500 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- If any crack is found. Contact Boeing for repair instructions and do the repair. Before further flight. -- All airplanes with scribe line using a LRTS program inspection. Contact Boeing for additional inspections or repair. Before 75,000 total flight cycles. -- (a) Refer to Figure 22 of this service bulletin for definition of Zones 9, 10 and 11. (b) First scribe line opportunity is provided by maintenance records. Adjust the compliance time as given below: 1. If record of first decal installation since delivery is available, then add the airplane flight cycles at first decal installation to the threshold. 2. If record of first decal installation since delivery is not available, add 6,000 flight cycles to the threshold. (c) Accomplishment of the detailed inspection is terminating action for the general visual repeat inspections. (d) Refer to Accomplishment Instructions Paragraph 3.B.7. Part 7 - for definition of a typical scribe line. (e) No further inspections are required at this location. (f) As an alternative, an optical micrometer may be used to determine scribe depth greater than 0.001 inch. Group 3, 8: Table 7: Decal Zone 9, Zone 10, Zone 11, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 58 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 58 of 254 BOEING SERVICE BULLETIN 737-53A1289 Group 4, 9: Table 8: Decal Zone 12, Zone 13, Zone 14, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) Decal Installed in Zone 12. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 60,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 60,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) Decal Installed in Zone 13. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 40,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 40,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) Decal Installed in Zone 14. (a) Do an external detailed inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 25,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with the Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 25,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) No scribe line is found. (d) No further inspections are required.(e) - - - ### Page 59 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 59 of 254 BOEING SERVICE BULLETIN 737-53A1289 Any scribe line is found. (d) Do an external detailed inspection and a laser measurement inspection to determine the scribe line depth in accordance with Accomplishment Instructions Paragraph 3.B.8. Part 8 - Scribe Line Found. (f) Before further flight. -- Scribe line is found less than 0.001 inch deep. (d) No further inspections are required. (e) Before further flight. -- Scribe line is found within the limits of a typical scribe line. (d) Do a HFEC inspection for any crack in accordance with Accomplishment Instructions Paragraph 3.B.9. Part 9 - Scribe Line Inspection. Before further flight. -- Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found not within the limits of a typical scribe line. (d) Contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 12 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 12 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection. (a) Before 60,000 total flight cycles. Within 10,000 flight cycles after the scribe line is found. 10,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 13 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 13 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection. (a) Before 40,000 total flight cycles. Within 5,000 flight cycles after the scribe line is found. 5,000 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Scribe line is found common to the decals in Zone 14 that is within the limits of a typical scribe line with no crack indication. (a)(d) In Zone 14 do an external detailed inspection and HFEC inspection of the scribe lines for any crack in accordance with Accomplishment Instructions Paragraph 3.B.10. Part 10 - LRTS program repeat inspection. (a) Before 25,000 total flight cycles. Within 2,500 flight cycles after the scribe line is found. 2,500 flight cycles. Or contact Boeing for repair instructions and do the repair. Before further flight. -- Group 4, 9: Table 8: Decal Zone 12, Zone 13, Zone 14, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) ### Page 60 Original Issue: January 14, 2009 Revision 1: November 18, 2009 737-53A1289 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 60 of 254 BOEING SERVICE BULLETIN 737-53A1289 If any crack is found. Contact Boeing for repair instructions and do the repair. Before further flight. -- All airplanes with scribe line using a LRTS program inspection. Contact Boeing for additional inspections or repair. Before 75,000 total flight cycles. -- (a) Refer to Figure 23 of this service bulletin for definition of Zones 12, 13 and 14. (b) First scribe line opportunity is provided by maintenance records. Adjust the compliance time as given below: 1. If record of first decal installation since delivery is available, then add the airplane flight cycles at first decal installation to the threshold. 2. If record of first decal installation since delivery is not available, add 6,000 flight cycles to the threshold. (c) Accomplishment of the detailed inspection is terminating action for the general visual repeat inspections. (d) Refer to Accomplishment Instructions Paragraph 3.B.7. Part 7 - for definition of a typical scribe line. (e) No further inspections are required at this location. (f) As an alternative, an optical micrometer may be used to determine scribe depth greater than 0.001 inch. Group 5, 10: Table 9: Decal Zone 15, Zone 16 - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) Decal Installed in Zone 15. (a) Do an external detailed inspection for any scribe line at the locations in accordance with Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Or Before 60,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. - Do an external general visual inspection for any scribe line at the locations in accordance with Accomplishment Instructions Paragraph 3.B.4. Part 4 - Decal - Inspection. Before 60,000 total flight cycles plus first scribe line opportunity. (b) Within 4,000 flight cycles after the date on this service bulletin. 1,000 flight cycles.(c) Group 4, 9: Table 8: Decal Zone 12, Zone 13, Zone 14, - Scribe Line Inspection Condition Action Compliance Time (Whichever Occurs Later) Repeat Interval (Not to Exceed) The text continues at https://openairdocs.org/service-documents/boeing/737-53a1289/file/a8faeb0d9ef0.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. 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