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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-57A2348 Original Issue: June 12, 2015 ATA System: 5752 SUBJECT: WINGS - Trailing Edge Flaps - Transmission Aft Bearing Plate Assembly Replacement Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 300-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2015 Boeing.
Unpublished Work. All Rights Reserved.
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The Boeing Company.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and Boeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing.
Original Issue: June 12, 2015 747-57A2348 1 of 75
3.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 2 of 75 BOEING SERVICE BULLETIN 747-57A2348
ALERTALERT
BLANK PAGE
Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected11
B. Concurrent Requirements11
C. Reason11
D. Description12
E. Compliance12
F. Approval13
G. Manpower13
H. Weight and Balance Changes15
I. Electrical Load Data15
J. References16
1. Existing Data:16
2. Data Supplied with this Service Bulletin:16
3. Installation Drawings Used in the Preparation of this Service Bulletin:16
K. Publications Affected16
L. Interchangeability and Intermixability of Parts17
M. Software Accomplishment Summary17
2. MATERIAL INFORMATION19
A. Material - Price and Availability19
B. Industry Support Information20
C. Parts Necessary for Each Airplane20
1. Kits/Parts20
2. Parts and Materials Supplied by the Operator22
3. Parts Modified and Reidentified22
4. Parts Removed and Not Replaced33
D. Parts Necessary to Change Spares33
E. Special Tooling - Price and Availability33
F. Special Tooling Necessary to do this Service Bulletin33
3. ACCOMPLISHMENT INSTRUCTIONS35
A. GENERAL INFORMATION35
B. WORK INSTRUCTIONS36
FIGURE 1: FLAP TRACK 1 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - REMOVAL . . . 42 FIGURE 2: FLAP TRACK 2 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - REMOVAL . . . 44 FIGURE 3: FLAP TRACK 3 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - REMOVAL . . . 46 FIGURE 4: FLAP TRACK 4 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - REMOVAL . . . 48 FIGURE 5: FLAP TRACK 5 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - REMOVAL . . . 50 FIGURE 6: FLAP TRACK 6 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - REMOVAL . . . 52 FIGURE 7: FLAP TRACK 7 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - REMOVAL . . . 54 FIGURE 8: FLAP TRACK 8 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - REMOVAL . . . 56 FIGURE 9: FLAP TRACK 1 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - INSTALLATION. 58 FIGURE 10: FLAP TRACK 2 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - INSTALLATION. 60 FIGURE 11: FLAP TRACK 3 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - INSTALLATION. 62 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 3 of 75 BOEING SERVICE BULLETIN 747-57A2348
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FIGURE 12: FLAP TRACK 4 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - INSTALLATION. 64 FIGURE 13: FLAP TRACK 5 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - INSTALLATION. 66 FIGURE 14: FLAP TRACK 6 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - INSTALLATION. 68 FIGURE 15: FLAP TRACK 7 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - INSTALLATION. 70 FIGURE 16: FLAP TRACK 8 - TRANSMISSION AFT BEARING PLATE ASSEMBLY - INSTALLATION. 72
APPENDIX A: COST BENEFIT ANALYSIS74
APPENDIX B: PARTS DEMAND INTENT75
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 4 of 75 BOEING SERVICE BULLETIN 747-57A2348
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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-57A2348Original Issue: June 12, 2015 ATA System: 5752 SUBJECT: WINGS - Trailing Edge Flaps - Transmission Aft Bearing Plate Assembly Replacement
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 This service bulletin is sent to provide instruction to replace the aluminum Transmission Aft Bearing Plate Assemblies with new titanium Transmission Aft Bearing Plate Assemblies. If the work given in this bulletin is not completed, then the aluminum Transmission Aft Bearing Plate Assemblies could be damaged in extreme loading conditions such as flap jams or skews. Under these conditions, damaged Transmission Bearing Plate Assemblies could stop the flap transmission from working correctly and could result in loss of flap control.
Alternatively, if failure of one of the other components in the flap attachment or flap drive system were to occur, the resulting redistribution of loads could result in damage to the aft bearing plate assemblies, potentially causing detachment of the flap transmission from its flap track and possible flap departure, resulting in loss of controllability of the airplane.
Boeing has done an analysis of the aluminum Transmission Aft Bearing Plate Assemblies. Each airplane has eight Transmission Aft Bearing Plate Assemblies, one at each of the eight flap track locations. Static strength analysis has shown that the aluminum Transmission Aft Bearing Plate Assemblies have inadequate strength for one or more of the required load cases, including cases for drive system jam, flap skew, and structural damage tolerance. These types of load cases can cause a flap transmission torque brake trip, which will then cause additional loading on the Transmission Aft Bearing Plate Assemblies common to that flap. This could cause damage to the Transmission Aft Bearing Plate Assemblies. The new titanium Transmission Aft Bearing Plate Assemblies have increased strength to prevent any potential damage caused in these high load cases.
Boeing has determined this scenario by analysis and has not yet received any reports of damaged Transmission Aft Bearing Plate Assemblies from operators.
NOTE: The work given in this service bulletin is a terminating action for the repeat inspections in Boeing Service Bulletin (SB) 747-57-2347. Each work package in this SB can be completed independently and is considered a terminating action for inspections in SB 747-57-2347 at that flap track only. Repeat inspections given in SB 747-57-2347 must continue at all flap tracks where the modification given in this SB has not been completed.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 5 of 75
Boeing did a cost benefit analysis on the changes given in this service bulletin. Refer to APPENDIX A for the analysis.
Boeing Service Related Problem (SRP) 747-8-SRP-57-0269 is related to this service bulletin.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., Compliance and Paragraph
1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesYesWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedYesPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsYesKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator YesOperator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION (PRR 85901-140S) Get access to the Transmission Aft Bearing Plate Assemblies located at each flap track. Remove and keep the inboard and outboard flap track fairings. Remove and discard the eight existing aluminum Transmission Aft Bearing Plate Assemblies. Install eight new titanium Transmission Aft Bearing Plate Assemblies and install kept inboard and outboard flap track fairings. Do an inboard and outboard flap adjustment, a check of the flap position and a trailing edge flap system test.
EFFECTIVITY 747-8, 747-8F Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
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.
Boeing recommends that the change given in this service bulletin be done within 48 months after the original issue date of this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 6 of 75 BOEING SERVICE BULLETIN 747-57A2348
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INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of March 12, 2014. Please refer to Paragraph
2.B., Industry Support Information. The warranty remedies will expire eight years from the original issue date of 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.
Operators are encouraged to complete the survey provided in APPENDIX B of this service bulletin to help Boeing predict the quantity and timing of the Boeing Supplied Kits/Parts.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 7 of 75 BOEING SERVICE BULLETIN 747-57A2348
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BOEING SERVICE BULLETIN 747-57A2348
ALERT ALERT
GET ACCESS TO THE TRANS MISSION AFT
BEARING PLATE ASSEMBLIES OCATED AT EACH FLAP TRACK. REMOVE AND KEEP THE INBOARD
AND OUTBOARD FAIRINGS
REMOVE AND DIS RD THE EIGHT EXISTING
ON AFT BEARING PLATE
HT NEW TITANIUM
TRANSMISSION AFT BE ING PLATE ASSEMBLIES
AND INS ARD AND OUTBOARD
FLAP TRACK FAIRINGS AN INBOARD AND
OUTBOARD FLAP ADJUST MENT, A CHECK OF THE
FLAP POSITION AND A TRAILING EDGE FLAP SYSTEM TEST.
FLAP TRACK (TYPICAL)
TRANSMISSION REMOVED FOR CLARITY (LEFT SIDE SHOWN, RIGHT SIDE OPPOSITE) 2402054 Original Issue: June 12, 2015 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING Work - See page 1 for details. 747-57A2348 8 of 75
Commercial Airplanes 747 Service Bulletin ALERT Number: 747-57A2348 Original Issue: June 12, 2015 ATA System: 5752 SUBJECT: WINGS - Trailing Edge Flaps - Transmission Aft Bearing Plate Assembly Replacement
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 This service bulletin is applicable to 747-8 and 747-8F Airplanes, line numbers 1420-1434, 1436-1505, 1507, 1508, 1510-1514 in 2 Groups. The Variable Numbers and Group Information for the applicable airplanes is given below. An equivalent change is on subsequent production airplanes. Refer to PRR 85901-140S for data about this change.
Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
DESCRIPTIONCONFIGURATIONGROUP 747-8F airplanes, line numbers 1420-1421 with unique track assembly part numbers -1 747-8F airplanes, line numbers 1422-1423 with unique track assembly part numbers -2 747-8F airplanes, line numbers 1424-1433 with unique track assembly part numbers -3 747-8F airplanes, line numbers 1436-1450 with unique track assembly part numbers -4 747-8 airplanes, line numbers 1434-1451 with unique track assembly part numbers -5 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 9 of 75
DESCRIPTIONCONFIGURATIONGROUP 747-8F airplanes, line numbers 1452-1496 with unique track assembly part numbers -6 747-8 airplanes, line numbers 1453-1499 with unique track assembly part numbers -7 747-8F airplanes, line numbers 1501-1505 with unique track assembly part numbers -8 747-8 airplanes, line numbers 1500-1503 with unique track assembly part numbers -9 747-8 airplanes, line numbers 1505-1514 with unique track assembly part numbers -10 Airplane Models:
747-8, 747-8F GroupVariable Number 5RC001 - RC005 7RC006 - RC009 5RC021 - RC023 7RC024 - RC034 9RC035 - RC036 10RC037 - RC040 10RC051 - RC052 7RC066 10RC067 - RC069 1RC501 2RC502 3RC503 4RC504 6RC505 - RC511 8RC512 1RC521 2RC522 3RC523 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 10 of 75 BOEING SERVICE BULLETIN 747-57A2348
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GroupVariable Number 6RC524 - RC528 3RC541 3RC546 6RC547 - RC549 3RC551 - RC553 4RC554 - RC557 6RC558 - RC563 8RC564 3RC571 - RC572 4RC573 - RC576 6RC577 - RC582 3RC601 4RC602 6RC603 - RC605 6RC641 - RC642 8RC671 - RC672
2. Spares Affected None.
B. Concurrent Requirements None.
C. Reason This service bulletin is sent to provide instruction to replace the aluminum Transmission Aft Bearing Plate Assemblies with new titanium Transmission Aft Bearing Plate Assemblies. If the work given in this bulletin is not completed, then the aluminum Transmission Aft Bearing Plate Assemblies could be damaged in extreme loading conditions such as flap jams or skews. Under these conditions, damaged Transmission Bearing Plate Assemblies could stop the flap transmission from working correctly and could result in loss of flap control. Alternatively, if failure of one of the other components in the flap attachment or flap drive system were to occur, the resulting redistribution of loads could result in damage to the aft bearing plate assemblies, potentially causing detachment of the flap transmission from its flap track and possible flap departure, resulting in loss of controllability of the airplane.
Boeing has done an analysis of the aluminum Transmission Aft Bearing Plate Assemblies. Each airplane has eight Transmission Aft Bearing Plate Assemblies, one at each of the eight flap track locations.
Static strength analysis has shown that the aluminum Transmission Aft Bearing Plate Assemblies have inadequate strength for one or more of the required load cases, including cases for drive system jam, flap skew, and structural damage tolerance. These types of load cases can cause a flap transmission Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 11 of 75 BOEING SERVICE BULLETIN 747-57A2348
ALERTALERT
torque brake trip, which will then cause additional loading on the Transmission Aft Bearing Plate Assemblies common to that flap. This could cause damage to the Transmission Aft Bearing Plate Assemblies. The new titanium Transmission Aft Bearing Plate Assemblies have increased strength to prevent any potential damage caused in these high load cases. Boeing has determined this scenario by analysis and has not yet received any reports of damaged Transmission Aft Bearing Plate Assemblies from operators.
NOTE: The work given in this service bulletin is a terminating action for the repeat inspections in Boeing Service Bulletin (SB) 747-57-2347. Each work package in this SB can be completed independently and is considered a terminating action for inspections in SB 747-57-2347 at that flap track only. Repeat inspections given in SB 747-57-2347 must continue at all flap tracks where the modification given in this SB has not been completed.
Boeing did a cost benefit analysis on the changes given in this service bulletin. Refer to APPENDIX A for the analysis.
Boeing Service Related Problem (SRP) 747-8-SRP-57-0269 is related to this service bulletin.
D. Description Get access to the Transmission Aft Bearing Plate Assemblies located at each flap track. Remove and keep the inboard and outboard flap track fairings. Remove and discard the eight existing aluminum Transmission Aft Bearing Plate Assemblies. Install eight new titanium Transmission Aft Bearing Plate Assemblies and install kept inboard and outboard flap track fairings. Do an inboard and outboard flap adjustment, a check of the flap position and a trailing edge flap system test.
The work in this service bulletin is done in the maintenance zone(s) given below.
Group 1-4, 6, 8:
Affected Maintenance Zones ZoneModel 561, 563, 565, 567, 661, 663, 665, 667747-8F Group 5, 7, 9-10:
Affected Maintenance Zones ZoneModel 561, 563, 565, 567, 661, 663, 665, 667747-8 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.
Boeing recommends that the change given in this service bulletin be done within 48 months after the original issue date of this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: June 12, 2015 747-57A2348 12 of 75 BOEING SERVICE BULLETIN 747-57A2348