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Commercial Airplanes 747 Service Bulletin Number: 747-53A2499 Original Issue: August 11, 2005 Revision 2: August 12, 2010 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Section 41, 42, and 46 Body Skin Lap Joint Inspections and Modifications Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 730-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.

9E991ECCN:

BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2005 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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.

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Table of Contents

Revision Transmittal Sheet5

Summary7

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

1. Airplanes ............................................ 1 1

2. Spares Affected ........................................ 1 8 B. Concurrent Requirements ...................................... 1 8 C. Reason ................................................ 1 8 D. Description .............................................. 1 9 E. Compliance .............................................. 2 3 F. Approval ............................................... 2 6 G. Manpower .............................................. 2 9 H. Weight and Balance Changes .................................... 3 0 I. Electrical Load Data ......................................... 3 0 J. References .............................................. 3 1

1. Existing Data: ......................................... 3 1

2. Data supplied with this Service Bulletin: ........................... 3 1

3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 3 4 K. Publications Affected ........................................ 3 4 L. Interchangeability and Intermixability of Parts ........................... 3 4

2. MATERIAL INFORMATION ........................................ 3 5 A. Material - Price and Availability ................................... 3 5 B. Industry Support Information .................................... 3 6 C. Parts Necessary For Each Airplane ................................. 3 6

1. Kits/Parts: ........................................... 3 6

2. Parts and Materials Supplied by the Operator: ........................ 5 2

3. Parts Modified and Reidentified: ............................... 5 2

4. Parts Removed and Not Replaced: .............................. 5 2 D. Parts Necessary to Change Spares ................................. 5 2 E. Special Tooling - Price and Availability ............................... 5 2 F. Special Tooling Necessary to do this Service Bulletin ....................... 5 2

3. ACCOMPLISHMENT INSTRUCTIONS .................................. 5 3 A. GENERAL INFORMATION ..................................... 5 3 B. WORK INSTRUCTIONS ....................................... 5 6 FIGURE 1: LOGIC DIAGRAM ....................................... 6 1 FIGURE 2: LAP JOINT INSPECTION [Group 1, 16] ........................... 6 2 FIGURE 3: LAP JOINT INSPECTION [Group 2] .............................. 7 3 FIGURE 4: LAP JOINT INSPECTION [Group 3] .............................. 8 9 FIGURE 5: LAP JOINT INSPECTION [Group 4] ............................. 1 0 3 FIGURE 6: LAP JOINT INSPECTION [Group 5] ............................. 1 1 9 FIGURE 7: LAP JOINT INSPECTION [Group 6] ............................. 1 3 3 FIGURE 8: LAP JOINT INSPECTION [Group 7] ............................. 1 4 9 FIGURE 9: LAP JOINT INSPECTION [Group 8] ............................. 1 6 5 FIGURE 10: LAP JOINT INSPECTION [Group 9] ............................. 1 7 9 FIGURE 11: LAP JOINT INSPECTION [Group 10] ............................ 1 9 1

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FIGURE 12: LAP JOINT INSPECTION [Group 11] ............................ 2 0 5 FIGURE 13: LAP JOINT INSPECTION [Group 12] ............................ 2 1 9 FIGURE 14: LAP JOINT INSPECTION [Group 13] ............................ 2 3 3 FIGURE 15: LAP JOINT INSPECTION [Group 14] ............................ 2 4 8 FIGURE 16: SECTION 41, STRINGER 6 - LAP JOINT MODIFICATION [Group 1-15] ......... 2 6 1 FIGURE 17: SECTION 41, STRINGER 23 - LAP JOINT MODIFICATION [Group 1, 14-15] ...... 2 6 5 FIGURE 18: SECTION 41, STRINGER 23 - LAP JOINT MODIFICATION [Group 2-12] ........ 2 6 7 FIGURE 19: SECTION 41, STRINGER 23 - LAP JOINT MODIFICATION [Group 13] ......... 2 6 9 FIGURE 20: SECTION 41, STRINGER 44 - LAP JOINT MODIFICATION [Group 1-15] ........ 2 7 1 FIGURE 21: SECTION 42, STRINGER 44 - LAP JOINT MODIFICATION [Group 1, 13-15] ...... 2 7 4 FIGURE 22: SECTION 42, STRINGER 44 - LAP JOINT MODIFICATION [Group 2-12] ........ 2 7 6 FIGURE 23: LAP JOINT INSPECTION [Group 15] ............................ 2 7 8 Appendix A: REDUCED EDGE MARGIN PROCEDURES ........................ 2 9 0

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Commercial Airplanes 747 Service Bulletin Revision Transmittal SheetNumber: 747-53A2499Original Issue: August 11, 2005 Revision 2: August 12, 2010 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Section 41, 42, and 46 Body Skin Lap Joint Inspections and Modifications This Revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION Federal Aviation Administration (FAA) Airworthiness Directive AD 2006-05-09 is related to this service bulletin.

No more work is necessary on airplanes changed as shown in the original issue or Revision 1 of this service bulletin.

No airplanes have been added to the service bulletin effectivity as a result of this revision; however, some airplanes from Group 1 were added to Group 15 and Group 16.

REASON FOR REVISION This revision is sent to include the following changes:

— In Summary: Updated related Airworthiness Directives. Added reference to paragraph 2.A., Material - Price and Availability due to addition of Boeing supplied kits.

— In paragraph 1.A., Effectivity: Added new Group 15 for 747-400 passenger airplanes (without a main deck side cargo door) that have been modified by Boeing to Boeing Converted Freighter (BCF). Also, added new Group 16 for airplanes modified to Large Cargo Freighter. Group 15 and 16 airplanes were previously in Groups 1.

— In paragraph 1.C., Reason: Added reason for sending Revision 2.

— In paragraph 1.D., Description: Added "No more work" statement and recommendation to accomplish Service Bulletin 747-53A2563 prior to accomplishing modification as given in this service bulletin. A note was clarified and updated table of other lap joint service bulletins. Added Affected Maintenance Zones tables.

— In paragraph 1.E., Compliance: Updated related Airworthiness Directives. Updated paragraph callouts, updated Supplemental Structural Inspection (SSI) callout, and added/updated footnotes in Table 1. In Table 2, revised the grace period for modification to specify after the Revision 1 date of this service bulletin instead of original release date and added footnotes. Also, added post-modification requirements and requirements for airplanes that have exceeded 35,000 total flight cycles. Also, added Tables 3 and 4 for Group 16 airplanes.

— In paragraph 1.F., Approval: Updated existing Alternative Method of Compliance (AMOC) statements for Airworthiness Directives (AD) 94-15-17, 2004-07-22 R1, 2006-05-09, and 2008-16-14. Added AMOC statements for several additional ADs that could be affected if the inspections and/or modifications are done as given in this service bulletin.

— In paragraph 1.G., Manpower: Revised Group number due to added groups. Also, revised estimates for Section 42 modification.

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— In paragraph 1.J., References: Updated existing data references and updated/added drawing data supplied with the service bulletin.

— In paragraph 1.K., Publications Affected: Added information for damage tolerance based inspections.

— In paragraph 2.A., Material Price and Availability: Added price and availability information for stringer 6 modification kits.

— In paragraph 2.C., Parts Necessary for Each Airplane: Added parts kit lists for stringer 6 modification kits.

— In paragraph 3.A., General Information: Updated/Added general information notes.

— In paragraph 3.B, Work Instructions: Added reference to new Figure 23 for Group 15 airplanes, and added instructions and applicability for Group 16. Updated SRM references for repair. Added recommendation to accomplish Service Bulletin 747-53A2563 prior to accomplishing modification as given in this service bulletin.

Updated airplane group applicability in the instructions.

— In Figure 2, added applicability for Group 16.

— In Figures 3, 5, 7-9, 11-15, and 23: Clarified note (a).

— In Figure 15: Corrected note identifier. Note (e) was incorrectly sequenced as note (f).

— In Figure 16: Revised illustration and step table to reflect new drawings for stringer 6 modification.

— In Figures 17 through 22, updated airplane group applicability.

— Figure 23: This new figure has been added to specify unique inspection requirements for airplanes that have been modified to BCF.

— Appendix A: This new appendix has been added to specify procedures when reduced edge margin exists at fastener locations common to shear ties.

The data given in Information Notice 747-53A2499 IN01 is included in this revision.

Some of the data given in Information Notice 747-53A2499 IN02 is included in this revision. The data from IN02 that is not included has either been superseded, or is no longer applicable.

Paragraph 1.A., Effectivity, shows changes of airplane operators. Each operator should examine the Effectivity paragraph for changes.

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

Pages with no vertical lines have no important changes.

REVISION HISTORY August 11, 2005Original Issue:

October 30, 2008Revision 1:

August 12, 2010Revision 2:

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Commercial Airplanes 747 Service Bulletin SummaryNumber: 747-53A2499Original Issue: August 11, 2005 Revision 2: August 12, 2010 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Section 41, 42, and 46 Body Skin Lap Joint Inspections and Modifications

CONCURRENT REQUIREMENTS None.

BACKGROUND This service bulletin gives data for the inspection and repair of certain fuselage skin longitudinal lap joints. These inspections and repairs are necessary for safe operation of airplanes past the design goal for economic usage.

Boeing has completed extended pressure fatigue tests on a 747-100SR and a 747-400 fuselage test article.

Analysis of these test results have identified areas of the fuselage lap joints where fatigue cracks can occur.

Boeing has also used updated analysis methods on the 747 skin longitudinal lap joints. Inspection and repair of these areas is necessary for safe operation of airplanes past the design goal for economic usage.

The inspections in this service bulletin will make sure that fatigue cracks in the overlapping skin at the upper row of fasteners in certain fuselage lap joints are found and repaired before they become critical. Skin cracks not detected prior to reaching critical crack length may result in the inability to withstand current regulatory fail-safe loads, in-flight depressurization of the airplane or loss of structural integrity.

Revision 1: Subsequent to the release of the original issue of this service bulletin, a review of all lap joints was accomplished for the affected airplanes. It was determined that all lap joints with an upper skin thickness of

0.090 inches or less should be inspected at the times given in Paragraph 1.E., Compliance. In addition, a review of all service bulletins which recommend repeat inspections was accomplished to determine if the inspections were appropriate on aging airplanes. This review indicated that certain lap joints where the skin thickness is less than or equal to 0.071 inches should be modified at the times given in Paragraph 1.E., Compliance.

Boeing Service Related Problem (SRP) 747-SRP-53-0211 and 747OP-SRP-53-0279 are related to this service bulletin.

ACTION (PRR 85901-91RS) Lap joint inspection

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Do external High Frequency Eddy Current (HFEC) inspections of certain lap joints for cracks. These lap joints are in Section 41, Section 42, and Section 46. In addition, do internal and external Low Frequency Eddy Current (LFEC) inspections at certain doublers common to these lap joints. If no cracks are found, do the inspection again at the time shown in this service bulletin. If cracks are found, remove the fastener in the cracked hole and sufficient adjacent fasteners and do open hole HFEC inspections to find the crack length. Repair before any more flights. Repair as shown in the structural repair manual or ask Boeing for repair data. As part of the repair, do open-hole HFEC inspections of the skin at all existing fastener locations common to the repair.

Lap joint modification Do eddy current inspections of the lap joints in sections 41 and 42 that will be modified. If cracks are found, repair the cracks and contact Boeing for lap joint modification instructions. For areas where no cracks are found, do the lap joint modifications.

EFFECTIVITY 747-200C, 747-200F, 747-400, 747-400D, and 747-400F airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes.

COMPLIANCE Refer to Service Bulletin Paragraph 1.E., for Compliance information.

Federal Aviation Administration (FAA) Airworthiness Directives 90-06-06, 90-21-17, 90-23-14, 94-15-17, 2004-07-22 R1, 2005-08-01, 2006-05-09, 2006-20-02, 2006-22-09, 2006-24-02, 2006-24-05, 2007-15-07, 2008-16-14, and 2009-04-16 are related to this service bulletin.

The Federal Aviation Administration (FAA) will possibly release another Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.

INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection, repair, or modification procedures given in this service bulletin.

MANPOWER Refer to Paragraph 1.G., Manpower.

MATERIAL INFORMATION Boeing Supplied Kits/Parts.

Refer to Paragraph 2.A., Material - Price and Availability.

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BOEING SERVICE BULLETIN 747-53A2499 an alaus

DO EXTERNAL SURFACE HFEC INSPECTIONS OF THE SKIN

AROUND THE UPPER ROW OF FASTENERS IN CERTAIN LAP JOINTS IN SECTION 41, 42 AND 46. IF CRACKS ARE

FOUND, REPAIR BEFORE ANY MORE FLIGHTS AS SHOWN IN THE SRM.

DO STRUCTURAL MODIFICATIONS ON SPECIFIED LAP JOINTS AT STRINGERS 6 AND 23 IN SECTION 41 AND AT STRINGER 44 IN W49253 SECTIONS 41 AND 42.

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Commercial Airplanes 747 Service Bulletin Number: 747-53A2499 Original Issue: August 11, 2005 Revision 2: August 12, 2010 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Section 41, 42, and 46 Body Skin Lap Joint Inspections and Modifications

1. PLANNING INFORMATION A. Effectivity

1. Airplanes Refer to Service Bulletin Index Document D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.

This service bulletin is for the airplanes shown below. Refer to PRR85901-44RS and PRR85901-91RS for data about this change.

DESCRIPTIONCONFIGURATIONGROUP 747-400 airplanes without a main deck side cargo door, except airplanes modified by Boeing to Boeing Converted Freighter (BCF) configuration as of 2/19/2010.

-1 All 747-200F airplanes, line numbers 201 through 347, with a main deck side cargo door.

-2 747-200F airplanes, line numbers 201 through 347, without a main deck side cargo door.

-3 747-200F airplanes, line numbers 348 through 628, with a main deck side cargo door.

-4 All 747-200F airplanes, line numbers 348 through 628, without a main deck side cargo door.

-5 747-200F airplanes, line numbers 629 through 685.-6 747-200F airplanes, line numbers 686 and on.-7 747-200C airplanes, line numbers 201 through 327, with a main deck side cargo door.

-8

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DESCRIPTIONCONFIGURATIONGROUP 747-200C airplanes, line numbers 201 through 327, without a main deck side cargo door.

-9 747-200C airplanes, line numbers 328 through 628.-10 747-200C airplanes, line numbers 629 through 685.-11 747-200C airplanes, line numbers 686 and on.-12 All 747-400F airplanes.-13 All 747-400 airplanes with a main deck side cargo door, except 747-400F airplanes. This group includes 747-400 airplanes with a main deck side cargo door that have been modified by Boeing to BCF configuration.

-14 747-400 passenger airplanes (previously in Group 1) that have been modified by Boeing to BCF configuration as of 2/19/2010.

-15 747-400 airplanes that have been modified to Large Cargo Freighter.-16 Airplane Models:

747-200C, 747-200F, 747-400, 747-400D, 747-400F GroupVariable Number 1RF001 - RF006 9RJ131 - RJ133 9RJ151 - RJ152 8RJ301 - RJ302 10RJ303 11RJ321 12RJ322 10RJ331 - RJ333 13RL401 - RL403 13RL411 - RL436 13RL451 - RL456 13RL461 - RL462 13RL471 - RL481 13RL491 - RL492

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