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Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-57A2371 RB Original Issue: September 29, 2023 ATA System: 5720 2811 SUBJECT: WINGS - Fuel Tanks and Auxiliary Structure - Fuel Tank Fasteners Change EXPORT CONTROLLED - This technology or software is subject to the U.S. Export Administration Regulations (EAR), (15 C.F.R. Parts 730-774). No authorization from the U.S. Department of Commerce is required for export, re-export, in-country transfer, or access EXCEPT to country group E:1 or E:2 countries/persons per Supp.1 to Part 740 of the EAR.
9E991ECCN:
Copyright © 2023 The Boeing Company 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: September 29, 2023 747-57A2371 RB 1 of 18
6.0
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: September 29, 2023 747-57A2371 RB 2 of 18 REQUIREMENTS BULLETIN 747-57A2371
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Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected6
2. CONCURRENT REQUIREMENTS6
3. COMPLIANCE6
4. APPROVAL6
5. ACCOMPLISHMENT INSTRUCTIONS7
A. General Information7
B. Work Instructions7
FIGURE 1: FRONT SPAR - STATION 600 LEFT WING - FASTENERS FILLET SEAL APPLICATION . 9 FIGURE 2: FRONT SPAR - STATION 600 RIGHT WING - FASTENERS FILLET SEAL APPLICATION. 14 Export Controlled ECCN: 9E991 See page 1 for details Original Issue: September 29, 2023 747-57A2371 RB 3 of 18 REQUIREMENTS BULLETIN 747-57A2371
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Export Controlled ECCN: 9E991 See page 1 for details Original Issue: September 29, 2023 747-57A2371 RB 4 of 18 REQUIREMENTS BULLETIN 747-57A2371
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Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-57A2371 RB Original Issue: September 29, 2023 ATA System: 5720 2811 SUBJECT: WINGS - Fuel Tanks and Auxiliary Structure - Fuel Tank Fasteners Change
THIS DOCUMENT 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 DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER. THIS IS AN ENHANCED REQUIRED FOR COMPLIANCE DOCUMENT. THE BOEING
PROCESSES USED TO CREATE THE SERVICE BULLETIN (SB) AND THE REQUIREMENTS BULLETIN (RB) ENSURE THAT THE INFORMATION BETWEEN "RC START" AND "RC END" IN THE SB ARE IDENTICAL TO THE INFORMATION IN THE SAME SECTIONS (COMPLIANCE, WORK INSTRUCTIONS…) OF THE RB WHICH THE SB REFERS TO AS THE RELATED DOCUMENT.
1. Effectivity A. Airplanes This bulletin is applicable to 747-400F Airplane(s), line number(s) 1364-1419 in 1 Group(s). Where the effectivity is presented with hyphens between line numbers, the airplane applicability means "through" and "inclusive", e.g. line numbers 1-9 means line numbers 1 through 9 inclusive.
DESCRIPTIONCONFIGURATIONGROUP 747-400F Airplanes with missing fuel tank fastener cap seals.-1 Airplane Models:
747-400F GroupVariable Number 1RL429 - RL430 1RL435 - RL436 1RL454 - RL456 1RL473 - RL481 1RL491 - RL492 1RL501 - RL502 GroupVariable Number 1RL511 - RL516 1RL521 - RL522 1RL531 - RL534 1RL551 1RL561 - RL568 1RL571 - RL572 GroupVariable Number 1RL576 - RL577 1RL579 1RL581 - RL586 1RL684 1RM863 1RM889 - RM890 B. Spares Affected Export Controlled ECCN: 9E991 See page 1 for details Original Issue: September 29, 2023 747-57A2371 RB 5 of 18
None.
2. CONCURRENT REQUIREMENTS None.
3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 747-57A2371 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 747-57A2371 RB mandatory.
Accomplish the required action(s), based on the applicable condition(s) in Table(s) 1 and 2, in accordance with Accomplishment Instructions.
Table 1: Cap Seal Application for Fasteners at Front Spar Station 600, Left Wing Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time ActionCondition -Within 60 months after the original issue date of Requirements Bulletin 747-57A2371 RB.
Apply cap seal to four fastener collars with missing cap seal inside the fuel tank common to the stiffeners located at the left wing front spar.
All airplanes.
Table 2: Cap Seal Application for Fasteners at Front Spar Station 600, Right Wing Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time ActionCondition -Within 60 months after the original issue date of Requirements Bulletin 747-57A2371 RB.
Apply cap seal to four fastener collars with missing cap seal inside the fuel tank common to the stiffeners located at the right wing front spar.
All airplanes.
4. APPROVAL This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this document comply with the applicable regulations and are FAA approved, as well as European Union Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in this Requirements Bulletin effectivity. This document and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other Boeing changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this Requirements Bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this Requirements Bulletin.
Export Controlled ECCN: 9E991 See page 1 for details Original Issue: September 29, 2023 747-57A2371 RB 6 of 18 REQUIREMENTS BULLETIN 747-57A2371
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5. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL INFORMATION NOTE: 1. This is an Enhanced Required for Compliance document. There will be a separate Service Bulletin (SB) and a separate Requirements Bulletin (RB). If an RB is mandated by an Airworthiness Directive (AD), then all applicable requirements specified in the RB must be done. For the related SB, some locations are marked RC Start and RC End to identify the requirements that are restated from the RB. For the related SB, the areas between RC Start and RC End, including sub-steps and any figures identified between RC Start and RC End, must be done to comply with the AD.
Therefore, an Alternative Method of Compliance (AMOC) is required for any deviations to steps between RC Start and RC End, including substeps and identified figures.
For the related SB, the steps not between RC Start and RC End may be deviated from using accepted methods in accordance with the operator's maintenance or inspection program without obtaining approval of an AMOC; this is provided that the steps between RC Start and RC End, including sub-steps and identified figures, can still be done as specified, and the airplane can be put back in an airworthy condition.
Figures not required for compliance are omitted from the RB.
2. This is an Enhanced Required for Compliance document. The Boeing processes used to create the Service Bulletin (SB) and the Requirements Bulletin (RB) ensure that the information between "RC Start" and "RC End" in the SB are identical to the information in the same sections (Compliance, Work Instructions...) of the RB which the SB refers to as the related document.
3. The compliance times for the actions in WORK INSTRUCTIONS are in Compliance.
4. Some Work Instructions task(s) can be related to Critical Design Configuration Control Limitation (CDCCL) required by Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs) 747-400 MPD Section 9. Strict adherence to Airworthiness Limitations are required.
5. These work instructions refer to procedures included in other Boeing documents.
When the words "refer to" are used and the operator has an accepted alternative procedure, the accepted alternative procedure can be used. When the words "in accordance with" are included in the instruction, the procedure in the Boeing document must be used.
6. If it is necessary to remove more parts for access, you can remove those parts. If you can get access without removing identified parts, it is not necessary to remove all of the identified parts. Jacking and shoring limitations must be observed.
7. Cap sealing for this bulletin is applying fillet seal to the fastener ensuring the fastener is fully encapsulated.
B. WORK INSTRUCTIONS Actions Required For Compliance
1. Requirements
a. WORK PACKAGE 1: Cap Seal Application for Fasteners, Left Wing Export Controlled ECCN: 9E991 See page 1 for details Original Issue: September 29, 2023 747-57A2371 RB 7 of 18 REQUIREMENTS BULLETIN 747-57A2371
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Table 1: Cap Seal Application for Fasteners at Front Spar Station 600, Left Wing Refer to the listed procedures in SB 747- 57A2371 Original Issue or later approved revisions as an accepted procedure.
Method of Compliance ActionCondition PART 1: OPEN AC-
CESS, LEFT WING -Apply cap seal to four fastener collars with missing cap seal inside the fuel tanks common to the stiffeners located at the left wing front spar.
All airplanes.
-FIGURE 1 PART 2: CLOSE AC-
CESS, LEFT WING -
b. WORK PACKAGE 2: Cap Seal Application for Fasteners, Right Wing Table 2: Cap Seal Application for Fasteners at Front Spar Station 600, Right Wing Refer to the listed procedures in SB 747- 57A2371 Original Issue or later approved revisions as an accepted procedure.
Method of Compliance ActionCondition PART 3: OPEN AC-
CESS, RIGHT WING -Apply cap seal to four fastener collars with missing cap seal inside the fuel tanks common to the stiffeners located at the right wing front spar.
All airplanes.
-FIGURE 2 PART 4: CLOSE AC-
CESS, RIGHT WING - Export Controlled ECCN: 9E991 See page 1 for details Original Issue: September 29, 2023 747-57A2371 RB 8 of 18 REQUIREMENTS BULLETIN 747-57A2371
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REQUIREMENTS BULLETIN 747-57A2371
ALERT ALERT FSS AN 628.06 FSS
335.46 3014105 FIGURE 1: FRONT SPAR - STATION 600 LEFT WING - FASTENERS FILLET SEAL APPLICATION (SHEET 1 OF 5) Original Issue: September 29, 2023 Export Controlled ECCN: 9E991 747-57A2371 RB See page 1 for details 9 of 18
REQUIREMENTS BULLETIN 747-57A2371
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FSS FSS FSS UPPER SKIN
610.00 600.00 590.00 + + + + L++. → B + - + - FRONT SPAR
LOWER SKIN
VIEW LOOKING FORWARD A-A 3014109 FIGURE 1: FRONT SPAR - STATION 600 LEFT WING - FASTENERS FILLET SEAL APPLICATION (SHEET 2 OF 5) Original Issue: September 29, 2023 747-57A2371 RB Export Controlled ECCN: 9E991 See page 1 for details 10 of 18
REQUIREMENTS BULLETIN 747-57A2371
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FASTENER
TANK SIDE
DRY SIDE B-B WEB.
FASTENER
3)4
TANK SIDE
DRY SIDE FWD C-C 3014115 FIGURE 1: FRONT SPAR - STATION 600 LEFT WING - FASTENERS FILLET SEAL APPLICATION (SHEET 3 OF 5) Original Issue: September 29, 2023 747-57A2371 RB Export Controlled ECCN: 9E991 See page 1 for details 11 of 18
REQUIREMENTS BULLETIN 747-57A2371
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0.10
0.10 MINIMUM MINIMUM 0.10
MINIMUM
TANK SIDE
TANK SIDE
• 0.12 MINIMUM 0.12
MINIMUM
0.10
0.10 MINIMUM
MINIMUM
MAKE THIS AREA
TANK SIDE SMOOTH (EXAMPLE) TANK SIDE
0.12
0.12 MINIMUM
MINIMUM NOTE: ALL DIMENSIONS ARE IN INCHES.
TYPICAL FASTENER INSTALLATIONS 3038616 FIGURE 1: FRONT SPAR - STATION 600 LEFT WING - FASTENERS FILLET SEAL APPLICATION (SHEET 4 OF 5) Original Issue: September 29, 2023 747-57A2371 RB Export Controlled ECCN: 9E991 See page 1 for details 12 of 18