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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-57A2331 Original Issue: November 12, 2009 ATA System: 5715 SUBJECT: WINGS - Center Wing - Wing Landing Gear Support Beam End Fittings - Inspection, Repair and Change 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2009 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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.
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Original Issue: November 12, 2009 747-57A2331 1 of 186
7.0
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Original Issue: November 12, 2009 747-57A2331 2 of 186 BOEING SERVICE BULLETIN 747-57A2331
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BLANK PAGE
Table of Contents
Summary5
1. PLANNING INFORMATION ........................................ 1 1 A. Effectivity ............................................... 1 1
1. Airplanes ............................................ 1 1
2. Spares Affected ........................................ 2 2 B. Concurrent Requirements ...................................... 2 2 C. Reason ................................................ 2 2 D. Description .............................................. 2 4 E. Compliance .............................................. 2 7 F. Approval ............................................... 3 9 G. Manpower .............................................. 4 0 H. Weight and Balance Changes .................................... 4 6 I. Electrical Load Data ......................................... 4 6 J. References .............................................. 4 6
1. Existing Data .......................................... 4 6
2. Data supplied with this Service Bulletin ............................ 4 7
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 4 7 K. Publications Affected ........................................ 4 7 L. Interchangeability and Intermixability of Parts ........................... 4 7
2. MATERIAL INFORMATION ........................................ 4 9 A. Material - Price and Availability ................................... 4 9 B. Industry Support Information .................................... 5 0 C. Parts Necessary For Each Airplane ................................. 5 0
1. Kits/Parts ............................................ 5 0
2. Parts and Materials Supplied by the Operator ........................ 5 2
3. Parts Modified and Reidentified ................................ 5 5
4. Parts Removed and Not Replaced .............................. 5 8 D. Parts Necessary to Change Spares ................................. 5 8 E. Special Tooling - Price and Availability ............................... 5 9 F. Special Tooling Necessary to do this Service Bulletin ....................... 5 9
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 6 1 A. GENERAL INFORMATION ..................................... 6 1 B. WORK INSTRUCTIONS ....................................... 6 2 FIGURE 1: LEFT WING LANDING GEAR SUPPORT BEAM END FITTING - DETAILED AND ULTRASONIC INSPECTION [Group 1, 3-5] .................................. 8 0 FIGURE 2: LEFT WING LANDING GEAR SUPPORT BEAM END FITTING - DETAILED AND ULTRASONIC INSPECTION [Group 2] .................................... 8 2 FIGURE 3: LEFT WING LANDING GEAR SUPPORT BEAM END FITTING - DETAILED INSPECTION .................................................. 8 4 FIGURE 4: RIGHT WING LANDING GEAR SUPPORT BEAM END FITTING - DETAILED AND ULTRASONIC INSPECTION [Group 1, 3-5] .................................. 8 7 FIGURE 5: RIGHT WING LANDING GEAR SUPPORT BEAM END FITTING - DETAILED AND ULTRASONIC INSPECTION [Group 2] .................................... 8 9 FIGURE 6: RIGHT WING LANDING GEAR SUPPORT BEAM END FITTING - DETAILED INSPECTION .................................................. 9 1
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Original Issue: November 12, 2009 747-57A2331 3 of 186 BOEING SERVICE BULLETIN 747-57A2331
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FIGURE 7: LEFT WING LANDING GEAR SUPPORT BEAM END FITTING - DETAILED AND HIGH FREQUENCY EDDY CURRENT INSPECTION ....................... 9 4 FIGURE 8: RIGHT WING LANDING GEAR SUPPORT BEAM END FITTING - DETAILED AND HIGH FREQUENCY EDDY CURRENT INSPECTION ....................... 9 7 FIGURE 9: LEFT WING LANDING GEAR SUPPORT BEAM END FITTING - CORROSION INHIBITING COMPOUND APPLICATION ................................. 1 0 0 FIGURE 10: RIGHT WING LANDING GEAR SUPPORT BEAM END FITTING - CORROSION INHIBITING COMPOUND APPLICATION ................................. 1 0 2 FIGURE 11: WING LANDING GEAR SUPPORT BEAM END FITTING - BUSHING REMOVAL AND INSPECTION [Group 1] .................................... 1 0 4 FIGURE 12: WING LANDING GEAR SUPPORT BEAM END FITTING - BUSHING REMOVAL AND INSPECTION [Group 2] .................................... 1 0 7 FIGURE 13: WING LANDING GEAR SUPPORT BEAM END FITTING - BUSHING REMOVAL AND INSPECTION [Group 3-5] .................................. 1 1 0 FIGURE 14: WING LANDING GEAR SUPPORT BEAM END FITTING - BUSHING REMOVAL AND INSPECTION [Group 6] .................................... 1 1 3 FIGURE 15: WING LANDING GEAR SUPPORT BEAM END FITTING - CRACK/CORROSION REMOVAL, LUG BORE OVERSIZE AND FINISHES APPLICATION [Group 1] ............ 1 1 6 FIGURE 16: WING LANDING GEAR SUPPORT BEAM END FITTING - CRACK/CORROSION REMOVAL, LUG BORE OVERSIZE AND FINISHES APPLICATION [Group 3-5] ........... 1 2 2 FIGURE 17: WING LANDING GEAR SUPPORT BEAM END FITTING - CRACK/CORROSION REMOVAL, LUG BORE OVERSIZE AND FINISHES APPLICATION [Group 2] ............ 1 2 9 FIGURE 18: WING LANDING GEAR SUPPORT BEAM END FITTING - CRACK/CORROSION REMOVAL, LUG BORE OVERSIZE AND FINISH APPLICATION [Group 6] .............. 1 3 5 FIGURE 19: NEW HIGHER INTERFERENCE FIT WING LANDING GEAR SUPPORT BEAM END FITTING LUG BORE BUSHINGS - MAKE ............................... 1 4 1 FIGURE 20: NEW HIGHER INTERFERENCE FIT WING LANDING GEAR SUPPORT BEAM END FITTING BOLT HOLE BUSHINGS - MAKE .............................. 1 4 5 FIGURE 21: WING LANDING GEAR SUPPORT BEAM END FITTING NEW HIGHER INTERFERENCE FIT LUG BORE AND BOLT HOLE BUSHINGS - INSTALLATION [Group 1] ......... 1 5 6 FIGURE 22: WING LANDING GEAR SUPPORT BEAM END FITTING NEW HIGHER INTERFERENCE FIT LUG BORE AND BOLT HOLE BUSHINGS - INSTALLATION [Group 2] ......... 1 6 0 FIGURE 23: WING LANDING GEAR SUPPORT BEAM END FITTING NEW HIGHER INTERFERENCE FIT LUG BORE AND BOLT HOLE BUSHINGS - INSTALLATION [Group 3-5] ........ 1 6 4 FIGURE 24: WING LANDING GEAR SUPPORT BEAM END FITTING NEW HIGHER INTERFERENCE FIT LUG BORE AND BOLT HOLE BUSHINGS - INSTALLATION [Group 6] ......... 1 6 8 FIGURE 25: LEFT WING LANDING GEAR SUPPORT BEAM BUSHINGS - REPLACEMENT [Group 1] . 172 FIGURE 26: LEFT WING LANDING GEAR SUPPORT BEAM BUSHINGS - REPLACEMENT [Group 2-6] ................................................. 1 7 4 FIGURE 27: RIGHT WING LANDING GEAR SUPPORT BEAM BUSHINGS - REPLACEMENT [Group 1] ................................................. 1 7 6 FIGURE 28: RIGHT WING LANDING GEAR SUPPORT BEAM BUSHINGS - REPLACEMENT [Group 2-6] ................................................. 1 7 8 APPENDIX A: COMPLIANCE TABLES USAGE INDEX .......................... 1 8 0 APPENDIX B: INSPECTION AND REPAIR OR CHANGE OF END FITTINGS - GENERAL SCOPE OF WORK DIAGRAM ........................................... 1 8 2 APPENDIX C: WING LANDING GEAR SUPPORT BEAM END FITTING - ALTERNATIVE CRACK/CORROSION REMOVAL, LUG BORE OVERSIZE AND FINISHES APPLICATION ........... 1 8 4
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Original Issue: November 12, 2009 747-57A2331 4 of 186 BOEING SERVICE BULLETIN 747-57A2331
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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-57A2331Original Issue: November 12, 2009 ATA System: 5715 SUBJECT: WINGS - Center Wing - Wing Landing Gear Support Beam End Fittings - Inspection, Repair and Change
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
CONCURRENT REQUIREMENTS None.
BACKGROUND Accomplishment of the repair or change work given in this service bulletin will give increased corrosion protection to the end fittings of the Wing Landing Gear (WLG) support beams, which will subsequently give them better crack resistance. Undetected corrosion can result in the occurrence of cracks in the end fittings. Undetected cracks in the end fittings could result in their separation from the gate fittings and subsequently cause damage to flight control cables and hydraulic systems that are located in the adjacent areas. Continued safe flight and landing could be affected if the separation of an end fitting from a gate fitting occurs.
Three 747-400 operators have told Boeing of corrosion damage to the end fittings of the WLG support beams, where one operator also found cracks in the end fittings in addition to the corrosion. This same condition was told to Boeing earlier, which was related to 747-100/200/300 and 747-SP airplanes and addressed by Boeing service bulletin 747-57-2244, which was the subject of Federal Aviation Administration (FAA) Airworthiness Directive 89-15-07. The end fittings are installed on the outboard ends of the WLG support beams and they attach to gate fittings installed on the rear wing spars. There are two types of end fitting used on the 747 fleet.
One type is a two-piece end fitting, which is installed on the end of the WLG support beams in a 'back-to-back' configuration, the other type is a one-piece end fitting. Boeing service bulletin 747-57-2244 was applicable to all 747 Classic airplanes from Line Number 1 thru 695 and gave inspection instructions, repair work and terminating action for the end fittings. The terminating action replaced each of the end fitting lug bore and bolt hole bushings with new standard or oversize bushings. The new bushings and the end fittings were installed with sealant to give better corrosion prevention. That terminating action was incorporated into the design of replacement end fittings, which were used on production airplanes from Line Number 696 and subsequent. While the terminating action worked well, the most recent reports to Boeing were from operators of 747 airplanes after Line Number 695, which showed that the problem had occurred again. As a result of the more recent reports, Boeing has further investigated the cracks and corrosion of the end fittings. The investigation found that the cracks occur at the corroded areas on the end fittings. The corrosion is found to start at the lug bore and bushing interface, because moisture continues to get into this area, from exposure of the end fittings to environmental conditions.
Metallurgy analysis showed that cracks were a result of fatigue and their growth direction identified that they had started in the lug bore surface. The end fitting that was analysed, had a 0.806 inch length crack but also
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Original Issue: November 12, 2009 747-57A2331 5 of 186
was found to have a secondary crack approximately 0.7 inches away from the reported crack, that was only identified by magnetic particle inspection. Boeing has found that the terminating action given in Boeing service bulletin 747-57-2244 cannot continue to be classed as 'terminating' because the occurrence of cracks and corrosion has come back. Subsequently, Boeing has changed the retrofit solution from what was given in Boeing service bulletin 747-57-2244, to install higher interference fit bushings in the lug bore(s) and bolt holes of the end fittings. The changed retrofit solution also makes follow-on repeat inspections of the end fittings necessary after the new bushings are installed. The follow-on repeat inspection intervals are up to two times longer than the shorter inspection interval that was given in Boeing service bulletin 747-57-2244. The changed retrofit solution will give increased corrosion protection and better crack prevention to the end fittings. Boeing has issued this service bulletin to incorporate the changed retrofit solution and to replace Boeing service bulletin 747-57-2244.
As Boeing has had reports of cracked or corroded end fittings from operators of airplanes from Line Number 696 and subsequent, which have had the terminating action of Boeing service bulletin 747-57-2244 incorporated into their design, this service bulletin relates to all 747 airplanes from Line Number 1 thru 1419. This includes the airplanes that were applicable to Boeing service bulletin 747-57-2244 and those that were beyond its effectivity range.
This service bulletin gives instructions to inspect the end fittings of the left and right WLG support beams for cracks and corrosion. If no crack is found and no corrosion is found, the end fittings can continue to be repetitively inspected, or they can be changed to have higher interference fit bushings installed in their lug bore and bolt holes. If any crack or corrosion is found in an end fitting, each one is repaired to remove the cracks and corrosion and to have higher interference fit bushings installed in its lug bore(s) and bolt holes. The new higher interference fit bushings in the end fittings give increased corrosion protection and better crack prevention. After the repair or change work is done to the end fitting(s), post repair or change follow-on inspections will be necessary, but at a different interval.
Boeing Service Related Problem (SRP) 747-SRP-57-0217 is related to this service bulletin.
Boeing Service Letter (SL) 747-SL-57-050-A is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 747 FTD 57-08001 is related to this service bulletin.
ACTION Part 7 can be done as an option to Parts 1 thru 6. After Part 7 is accomplished, Part 1, Part 2 and Part 3 are terminated but Part 4, Part 5 and Part 6 continue to be necessary.
Part 1 - Wing Landing Gear (WLG) Support Beam End Fittings Inspection Group 1-5:
Prepare the airplane and remove wing panels to get access to the end fittings of the left and right WLG support beams. Do a detailed (DET) inspection and an ultrasonic (UT) inspection of each end fitting for cracks and corrosion. If no crack is found and no corrosion is found, one of two options can be done. One option is to repeat Part 1 to do DET and UT inspections of the end fittings at the same interval. The other option is to do Part 2 to do repeat DET and High Frequency Eddy Current (HFEC) inspections of the end fittings at a different interval.
If any crack or corrosion is found, do Part 7 to repair each removed end fitting, or to change each serviceable end fitting or new end fitting to install higher interference fit bushings.
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Original Issue: November 12, 2009 747-57A2331 6 of 186 BOEING SERVICE BULLETIN 747-57A2331
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Group 6:
Prepare the airplane and remove wing panels to get access to the end fittings of the left and right WLG support beams. Do a detailed (DET) inspection of each end fitting for fillet seal damage and for cracks and corrosion. If the fillet seal is not damaged, no crack is found and no corrosion is found, do Part 2 to do repeat DET and High Frequency Eddy Current (HFEC) inspections of the end fittings at the same interval. If the fillet seal is damaged, but no crack is found and no corrosion is found, remove the fillet seal from each end fitting and do DET and HFEC inspections for cracks and corrosion. If no crack is found and no corrosion is found, apply corrosion inhibiting compound on each end fitting and do Part 3 to do repeat DET and HFEC inspections for cracks and corrosion at a different interval. If any crack or corrosion is found, do Part 7 to repair each removed end fitting, or to change each serviceable end fitting or new end fitting to install higher interference fit bushings.
Part 2 - Wing Landing Gear (WLG) Support Beam End Fittings Repeat Detailed and High Frequency Eddy Current Inspection (Fillet Seal Remaining) Prepare the airplane and remove wing panels to get access to the end fittings of the left and right WLG support beams. Do a DET inspection of each end fitting for fillet seal damage and for cracks and corrosion. If the fillet seal is not damaged, no crack is found and no corrosion is found, repeat Part 2 to do DET and HFEC inspections of the end fittings at the same interval. If the fillet seal is damaged, but no crack is found and no corrosion is found, remove fillet seal from each end fitting and do DET and HFEC inspections for cracks and corrosion. If no crack is found and no corrosion is found, apply corrosion inhibiting compound on each end fitting and do Part 3 to do repeat DET and HFEC inspections for cracks and corrosion at a different interval. If any crack or corrosion is found, do Part 7 to repair each removed end fitting, or to change each serviceable end fitting or new end fitting to install higher interference fit bushings.
Part 3 - Wing Landing Gear (WLG) Support Beam End Fittings Repeat Detailed and High Frequency Eddy Current Inspection (Fillet Seal Removed) Prepare the airplane and remove wing panels to get access to the end fittings of the left and right WLG support beams. Do DET and HFEC inspections of each end fitting for cracks and corrosion. If no crack is found and no corrosion is found, apply corrosion inhibiting compound again on each end fitting and repeat Part 3 to do DET and HFEC inspections of the end fittings at the same interval. If any crack or corrosion is found, do Part 7 to repair each removed end fitting, or to change each serviceable end fitting or new end fitting to install higher interference fit bushings.
Part 4 - Wing Landing Gear (WLG) Support Beam End Fittings Post Repair or Change Follow-On Inspection Group 1-5:
Prepare the airplane and remove wing panels to get access to the end fittings of the left and right WLG support beams. Do a DET and UT inspection of each end fitting for cracks and corrosion. If no crack is found and no corrosion is found, one of two options can be done. One option is to repeat Part 4 to do DET and UT inspections of the end fittings at the same interval. The other option is to do Part 5 to do repeat DET and HFEC inspections of the end fittings at a different interval. If any crack or corrosion is found, do Part 7 to repair each removed end fitting, or to change each serviceable end fitting or new end fitting to install higher interference fit bushings.
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Original Issue: November 12, 2009 747-57A2331 7 of 186 BOEING SERVICE BULLETIN 747-57A2331
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Group 6:
Prepare the airplane and remove wing panels to get access to the end fittings of the left and right WLG support beams. Do a DET inspection of each end fitting for fillet seal damage and for cracks and corrosion. If the fillet seal is not damaged, no crack is found and no corrosion is found, do Part 5 to do repeat DET and HFEC inspections at the same interval. If the fillet seal is damaged, but no crack is found and no corrosion is found, remove the fillet seal from each end fitting and do DET and HFEC inspections for cracks and corrosion. If no crack is found and no corrosion is found, apply corrosion inhibiting compound on each end fitting and do Part 6 to do repeat DET and HFEC inspections for cracks and corrosion at a different interval. If any crack or corrosion is found, do Part 7 to repair each removed end fitting, or to change each serviceable end fitting or new end fitting to install higher interference fit bushings.
Part 5 - Wing Landing Gear (WLG) Support Beam End Fittings Post Repair or Change Repeat Detailed and High Frequency Eddy Current Follow-On Inspection (Fillet Seal Remaining) Prepare the airplane and remove wing panels to get access to the end fittings of the left and right WLG support beams. Do a DET inspection of each end fitting for fillet seal damage and for cracks and corrosion. If the fillet seal is not damaged, no crack is found and no corrosion is found, repeat Part 5 to do DET and HFEC inspections of the end fittings at the same interval. If the fillet seal is damaged, but no crack is found and no corrosion is found, remove the fillet seal from each end fitting and do DET and HFEC inspections for cracks and corrosion.
If no crack is found and no corrosion is found, apply corrosion inhibiting compound on each end fitting and do Part 6 to do repeat DET and HFEC inspections for cracks and corrosion at a different interval. If any crack or corrosion is found, do Part 7 to repair each removed end fitting, or to change each serviceable end fitting or new end fitting to install higher interference fit bushings.
Part 6 - Wing Landing Gear (WLG) Support Beam End Fittings Post Repair or Change Repeat Detailed and High Frequency Eddy Current Follow-On Inspection (Fillet Seal Removed) Prepare the airplane and remove wing panels to get access to the end fittings of the left and right WLG support beams. Do DET and HFEC inspections of each end fitting for cracks and corrosion. If no crack is found and no corrosion is found, apply corrosion inhibiting compound again on each end fitting and repeat Part 6 to do DET and HFEC inspections of the end fittings at the same interval. If any crack or corrosion is found, do Part 7 to repair each removed end fitting, or to change each serviceable end fitting or new end fitting to install higher interference fit bushings.
Part 7 - Wing Landing Gear (WLG) Support Beam End Fitting - Higher Interference Fit Bushings Installation Remove the end fitting(s) from the left and/or right WLG support beam, or get serviceable end fittings or new end fittings. Remove the lug bore bushings, bolt hole bushings and protective finishes from each end fitting. For removed end fittings and serviceable end fittings only, do DET and Magnetic Particle Inspections (MPI) of the lug bore, Fluorescent Penetrant Inspections (FPI) or MPI of the bolt holes and flat surfaces of each end fitting for cracks or corrosion. If no crack is found and no corrosion is found, insurance cut the lug bore(s) of each end fitting. If any crack or corrosion is found, oversize the lug bore(s) and bolt holes of each end fitting by the minimum necessary up to the maximum repair diameter, remove material from the flat surfaces up to the limit of material removal, to remove cracks and corrosion, and do repeat inspections until no crack is found and no corrosion is found. As an insurance cut, do an additional oversize of the lug bore(s) and, as applicable, do an additional oversize of the machined bolt holes and remove additional material from the machined flat surfaces. For all end fittings, do post machine work treatments and inspections, apply plating, finishes and make new higher interference fit lug bore and bolt hole bushings. Additionally, more post machine treatment work is necessary on 65B14472-23/-24 end fittings to shot peen all surfaces. If necessary, make new WLG support beam bushings.
Wet install the new lug bore and bolt holes bushings in each end fitting and fillet seal their edges. If new WLG support beam bushing were made, replace the WLG support beam bushings. Install the repaired or changed end fitting(s) back on the left and/or right WLG support beam.
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Original Issue: November 12, 2009 747-57A2331 8 of 186 BOEING SERVICE BULLETIN 747-57A2331
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EFFECTIVITY 747-100/100B/100B SUD/200B/200C/200F/300/400/400D/400F, 747SP, 747SR Airplanes. Refer to Paragraph
1.A., Effectivity for the list of affected airplanes.
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 configuration changes, inspection, and/or repair procedures given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Boeing and Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
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Original Issue: November 12, 2009 747-57A2331 9 of 186 BOEING SERVICE BULLETIN 747-57A2331
ALERTALERT
BOEING SERVICE BULLETIN 747-57A2331
ALERT ALERT PART 1 GROUP 1 THRU 5: DO A DETAILED (DET)
INSPECTION AND ULTRASONIC (UT) INSPECTION
OF EACH END FITTING FOR CRACKS AND CORROSION.
GROUP 6: DO A DETAILED INSPECTION (DET) AND
HIGH FREQUENCY EDDY CURENT (HFEC)
INSPECTION OF EACH END FITTING FOR CRACKS AND CORROSION.
PART 2
DO REPEAT DET AND HFEC INSPECTIONS OF
EACH END FITTING (FILLET SEAL REMAINING), FOR CRACKS AND CORROSION.
PART 3
LEFT WING LANDING GEAR (WLG) (RIGHT WLG OPPOSITE) DO REPEAT DET AND HFEC INSPECTIONS OF EACH END FITTING (FILLET SEAL REMOVED), FOR CRACKS AND CORROSION.
WING REAR SPAR PART 4 GROUP 1 THRU 5; AFTER AN END FITTING IS
REPAIRED OR CHANGED, DO FOLLOW-ON DET
AND UT INSPECTIONS FOR CRACKS AND CORROSION.
GROUP 6; AFTER AN END FITTING IS REPAIRED
OR CHANGED, DO FOLLOW-ON DET AND HFEC INSPECTIONS FOR CRACKS AND CORROSION.
PART 5
DO POST REPAIR OR CHANGE REPEAT DET AND
HFEC FOLLOW-ON INSPECTIONS OF EACH END
FITTING (FILLET SEAL REMAINING) FOR CRACKS AND CORROSION.
PART 6
DO POST REPAIR OR CHANGE REPEAT DET AND
HFEC FOLLOW-ON INSPECTIONS OF EACH END
FITTING (FILLET SEAL REMOVED) FOR CRACKS AND CORROSION.
PART 7
REMOVE END FITTING(S), OR GET SERVICEABLE END FITTINGS OR NEW END FITTINGS. REPAIR OF
CHANGE EACH END FITTING TO INSTALL HIGHER INTERFERENCE FIT BUSHINGS.
LEFT WLG GATE FITTING (RIGHT WLG GATE FITTING OPPOSITE) 1702508 Original Issue: November 12, 2009 747-57A2331
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 10 of 186
Commercial Airplanes 747 Service Bulletin ALERT Number: 747-57A2331 Original Issue: November 12, 2009 ATA System: 5715 SUBJECT: WINGS - Center Wing - Wing Landing Gear Support Beam End Fittings - Inspection, Repair and Change
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index Document D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplanes shown below.
DESCRIPTIONCONFIGURATIONGROUP 747-100 airplanes, from Line Number 1 to 133, delivered with Wing Landing Gear (WLG) support beam end fittings part number 65B01042-1/-2, or -9/-10 installed -1 That have not done the terminating action for the WLG support beam end fittings in accordance with Boeing service bulletin 747-57-2244 1 That have done the terminating action for the WLG support end fittings in accordance with Boeing service bulletin 747-57-2244 2
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Original Issue: November 12, 2009 747-57A2331 11 of 186
DESCRIPTIONCONFIGURATIONGROUP 747SP airplanes, from Line Number 265 to 676, delivered with Wing Landing Gear (WLG) support beam end fittings part number 65B14472-8 installed -2 That have not done the terminating action for the WLG support beam end fittings in accordance with Boeing service bulletin 747-57-2244 1 That have done the terminating action for the WLG support beam end fittings in accordance with Boeing service bulletin 747-57-2244 2 747-100/100B/100B SUD/200B/200C/200F/300 and 747SR airplanes, from Line Number 88 to 695, delivered with Wing Landing Gear (WLG) support beam end fittings part number 65B14472-1/-2 installed -3 That have not done the terminating action for the WLG support beam end fittings in accordance with Boeing service bulletin 747-57-2244 1 That have done the terminating action for the WLG support beam end fittings in accordance with Boeing service bulletin 747-57-2244 2 747-200B/200C/200F/300 airplanes, from Line Number 697 to 886, delivered with Wing Landing Gear (WLG) support beam end fittings part number 65B14472-25/-26 installed, which have the intent of the terminating action in accordance with Boeing service bulletin 747-57-2244 incorporated during production -4 747-400/400D airplanes, from Line Number 696 to 929, delivered with Wing Landing Gear (WLG) support beam end fittings part number 65B14472-23/-24 installed -5 747-400/400D/400F airplanes, Line Numbers 930 thru 1419, delivered with Wing Landing Gear (WLG) support beam end fittings part number 112U1701-1 installed -6 Airplane Models:
747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR GroupVariable Number 1RA001 - RA033 3RA034 1RA101 - RA115 1RA161 - RA162 3RA163 - RA164
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Original Issue: November 12, 2009 747-57A2331 12 of 186 BOEING SERVICE BULLETIN 747-57A2331