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Commercial Airplanes 737 Requirements Bulletin
SPECIAL ATTENTION Number: 737-57-1352 RB Original Issue: February 01, 2021 ATA System: 5720 SUBJECT: WINGS - Outer Wing - Upper and Lower Panel Stringer Fasteners Sealant Application 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:
Copyright © 2021 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Unpublished Work.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: February 01, 2021 737-57-1352 RB 1 of 48
2.0
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Original Issue: February 01, 2021 737-57-1352 RB 2 of 48 REQUIREMENTS BULLETIN 737-57-1352
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Table of Contents
1 . E F F E C T I V I T Y5
A . A i r p l a n e s5
B . S p a r e s A f f e c t e d5
2. CONCURRENT REQUIREMENTS6
3 . C O M P L I A N C E6
4. APPROVAL6
5. ACCOMPLISHMENT INSTRUCTIONS7
A. General Information7
B. Work Instructions8
FIGURE 1: LEFT SIDE WING BOX - UPPER WING PANEL STRINGER U-S1 SEALANT APPLICATION .................................................. 1 0 FIGURE 2: LEFT SIDE WING BOX - UPPER WING PANEL STRINGER U-S10 SEALANT APPLICATION .................................................. 1 3 FIGURE 3: LEFT SIDE WING BOX - UPPER WING PANEL STRINGER U-S12 SEALANT APPLICATION .................................................. 1 6 FIGURE 4: LEFT SIDE WING BOX - UPPER WING PANEL STRINGER U-S20 SEALANT APPLICATION .................................................. 1 9 FIGURE 5: LEFT SIDE WING BOX - UPPER WING PANEL STRINGER U-S21 SEALANT APPLICATION .................................................. 2 2 FIGURE 6: LEFT SIDE WING BOX - LOWER WING PANEL STRINGER L-S14 SEALANT APPLICATION .................................................. 2 5 FIGURE 7: RIGHT SIDE WING BOX - UPPER WING PANEL STRINGER U-S1 SEALANT APPLICATION .................................................. 2 8 FIGURE 8: RIGHT SIDE WING BOX - UPPER WING PANEL STRINGER U-S10 SEALANT APPLICATION .................................................. 3 1 FIGURE 9: RIGHT SIDE WING BOX - UPPER WING PANEL STRINGER U-S12 SEALANT APPLICATION .................................................. 3 4 FIGURE 10: RIGHT SIDE WING BOX - UPPER WING PANEL STRINGER U-S20 SEALANT APPLICATION .................................................. 3 7 FIGURE 11: RIGHT SIDE WING BOX - UPPER WING PANEL STRINGER U-S21 SEALANT APPLICATION .................................................. 4 0 FIGURE 12: RIGHT SIDE WING BOX - LOWER WING PANEL STRINGER L-S14 SEALANT APPLICATION .................................................. 4 3 APPENDIX A: INTEGRAL FUEL TANK STRUCTURE - SEALANT APPLICATION ............ 4 6 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 01, 2021 737-57-1352 RB 4 of 48 REQUIREMENTS BULLETIN 737-57-1352
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Commercial Airplanes 737 Requirements Bulletin
SPECIAL ATTENTION Number: 737-57-1352 RB Original Issue: February 01, 2021 ATA System: 5720 SUBJECT: WINGS - Outer Wing - Upper and Lower Panel Stringer Fasteners Sealant Application BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS DOCUMENT IMMEDIATELY. 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 737-8 Airplane(s), line number(s) 5852, 5902, 5948, 5992, 6034, 6074, 6114, 6154, 6188, 6222, 6272, 6290, 6326, 6344, 6360, 6372, 6384, 6396, 6408, 6420, 6430, 6441, 6448, 6456, 6472, 6481, 6499, 6515, 6528, 6535, 6548 in 1 Group(s).
The Variable Numbers and Group Information for the applicable airplanes is given below. Refer to PRR 3M9900-053RS for data about this change.
DESCRIPTIONCONFIGURATIONGROUP 737-8 Airplane-1 Airplane Models:
737-8 GroupVariable Number 11A005 - 1A014 11A201 - 1A207 11A301 - 1A306 GroupVariable Number 11A401 - 1A403 11B001 - 1B003 11B101 GroupVariable Number 11B201 -- -- B. Spares Affected None.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 01, 2021 737-57-1352 RB 5 of 48
2. CONCURRENT REQUIREMENTS None.
3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 737-57-1352 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 737-57-1352 RB mandatory.
Accomplish the required action(s), based on the applicable condition in Table 1, in accordance with Accomplishment Instructions.
Table 1: Left and Right Side Wing Box Upper and Lower Wing Panel Stringer Black Stripe with Overcoat and Existing Sealant - Sealant Application Repeat Interval (Not to Exceed) Compliance TimeActionCondition -Within 10 years after the date of issuance of the original airworthiness certificate or the original export certificate of airworthiness.
Completely encapsulate the black stripe with overcoat and existing sealant with BMS5-45 sealant at upper stringer U-S1, U-S10, U-S12, U- S20, U-S21 and lower stringer L-S14 just outboard of the wing box side of body.
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 the service 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 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 01, 2021 737-57-1352 RB 6 of 48 REQUIREMENTS BULLETIN 737-57-1352
5. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL INFORMATION
OBEY THE MANUFACTURER'S PROCEDURES WHEN YOU DO TASKS THAT ARE RELATED TO AIRWORTHINESS LIMITATIONS (AWL). IF YOU DO NOT
OBEY THE PROCEDURES, IT CAN INCREASE THE RISK OF A SOURCE OF IGNITION. INJURIES TO PERSONNEL, AND DAMAGE TO EQUIPMENT CAN OCCUR IF THERE IS A FIRE OR EXPLOSION.
WARNING 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. Boeing Service Letter 737-SL-51-042, Damage Reporting and Repair Plan/Design Guidelines, is an acceptable procedure to request information from Boeing for additional structural repair instructions. The Service Letter describes what information must be provided to Boeing before a structural repair can be provided.
5. Unless shown differently, these dimensions and tolerances are used:
– Linear dimensions are in inches – Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus or minus 0.03 inch – Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch – Angular tolerance is plus or minus 2 degrees – Hole dimensions for standard solid rivets and fasteners are in Structural Repair Manual (SRM) Chapter 51 – Torque Values:
— Values for structural fasteners are given in 737 Structural Repair Manual, Chapter 51.
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Original Issue: February 01, 2021 737-57-1352 RB 7 of 48 REQUIREMENTS BULLETIN 737-57-1352
— Values for airframe maintenance tasks are included in Chapter 20 of 737 Aircraft Maintenance Manual (AMM).
— Values for electrical maintenance tasks are included in Chapter 20 of Standard Wiring Practices Manual (SWPM).
— Values for engine maintenance tasks are included in Chapter 70 of 737 Aircraft Maintenance Manual (AMM).
— Non-standard torque values for maintenance tasks are included in the applicable installation step.
6. 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.
7. Where the work instructions include installation of a kept part, a new or serviceable part with the same part number can be installed as an alternative to the kept part.
8. 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.
14. Some Work Instruction tasks are related to Critical Design Configuration Control Limitations (CDCCL) required by Airworthiness Limitations (AWL) and Certification Maintenance Requirements (CMR), 737-7/8/8200/9/10 AWL D626A011-9-04. Strict adherence to Airworthiness Limitations is required.
15. The Work Instructions include access tasks that are related to Critical Design Configuration Control Limitations (CDCCL) required by 737-8 AWL 28-AWL-16. Strict adherence to Airworthiness Limitations are required.
B. WORK INSTRUCTIONS Actions Required for Compliance
1. Requirements Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 01, 2021 737-57-1352 RB 8 of 48 REQUIREMENTS BULLETIN 737-57-1352
Table 1: Left Side Wing Box Upper and Lower Wing Panel Stringer Black Stripe with Overcoat and Existing Sealant - Sealant Application Refer to the listed procedures in SB 737-57-1352 Original issue or later approved revisions as an accepted procedure.
Method of ComplianceActionCondition PART 1: GET ACCESS
TO THE LEFT CENTER
FUEL TANK -Completely encapsulate the black stripe with overcoat and existing sealant with BMS5-45 sealant at upper stringer U-S1, U- S10, U-S12, U-S20, U-S21 and lower stringer L-S14 just outboard of the wing box side of body.
All Airplanes -U-S1: FIGURE 1 U-S10: FIGURE 2 U-S12: FIGURE 3 U-S20: FIGURE 4 U-S21: FIGURE 5 L-S14: FIGURE 6 PART 2: CLOSE ACCESS
TO THE LEFT CENTER
FUEL TANK - Table 2: Right Side Wing Box Upper and Lower Wing Panel Stringer Black Stripe with Overcoat and Existing Sealant - Sealant Application Refer to the listed procedures in SB 737-57-1352 Original issue or later approved revisions as an accepted procedure.
Method of ComplianceActionCondition PART 3: GET ACCESS
TO THE RIGHT CENTER
FUEL TANK -Completely encapsulate the black stripe with overcoat and existing sealant with BMS5-45 sealant at upper stringer U-S1, U- S10, U-S12, U-S20, U-S21 and lower stringer L-S14 just outboard of the wing box side of body.
All Airplanes -U-S1: FIGURE 7 U-S10: FIGURE 8 U-S12: FIGURE 9 U-S20: FIGURE 10 U-S21: FIGURE 11 L-S14: FIGURE 12 PART 4: CLOSE ACCESS
TO THE RIGHT CENTER
FUEL TANK - Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 01, 2021 737-57-1352 RB 9 of 48 REQUIREMENTS BULLETIN 737-57-1352
REQUIREMENTS BULLETIN 737-57-1352 UPPER WING U-S20 PANEL U-S21 U-S12 U-S10 RIB 2 B U-S1 WBL 0 FWD LEFT WING BOX LOWER WING L-S14 PANEL -U-S1
VIEW LOOKING UP 2945088 FIGURE 1: LEFT SIDE WING BOX - UPPER WING PANEL STRINGER U-S1 SEALANT APPLICATION (SHEET 1 OF 3) Original Issue: February 01, 2021 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. 8010 01
REQUIREMENTS BULLETIN 737-57-1352
STRINGER STRINGER
UPPER UPPER
WING WING
PANEL PANEL
BLACK BLACK
STRIPE/ STRIPE/
OVERCOAT OVERCOAT BEFORE
1.00 INCH (MINIMUM) AFTER
STRINGER
STRINGER
UPPER WING PANEL
0.30 INCH
0.10 (BLACK STRIPE AND OVERCOAT ARE NOT SHOWN) A-A 0.12 INCH (MINIMUM)
UPPER WING
EXISTING SEALANT PANEL (BLACK STRIPE AND OVERCOAT ARE NOT SHOWN) BMS5-45, CLASS A-2 (BRUSHCOAT) B-B BMS5-45, CLASS B (ENCAPSULATE) 2945091 FIGURE 1: LEFT SIDE WING BOX - UPPER WING PANEL STRINGER U-S1 SEALANT APPLICATION (SHEET 2 OF 3) Original Issue: February 01, 2021 Export Controlled ECCN: 9E991 Copyright © Unpublished 737-57-1352 RB Work - See page 1 for details. 11 of 48
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this task/figure.
More DataQtyIdentificationNameTaskStep
(a)1112A3201-601STRINGER U-S1Clean1
(b)1112A3201-601STRINGER U-S1Prepare
(c)(d)8 OzBMS5-45, CLASS A-2FUEL TANK SEALANTApply2
(e)8 OzBMS5-45, CLASS BFUEL TANK SEALANTApply3
(a) Preliminary clean area for sealant application in accordance with APPENDIX A.
(b) Final clean beyond area shown and remove all contaminant material in accordance with APPENDIX A.
(c) Apply brushcoat with BMS5-45, Class A-2 in accordance with APPENDIX A.
(d) Apply brushcoat to the upper wing panel, existing sealant, blackstripe / overcoat not covered by existing sealant, stringer and beyond the radius of vertical flange of stringer.
(e) Apply encapsulate BMS5-45 Class B in accordance with APPENDIX A.
FIGURE 1: LEFT SIDE WING BOX - UPPER WING PANEL STRINGER U-S1 SEALANT APPLICATION (SHEET 3 OF 3) Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 01, 2021 737-57-1352 RB 12 of 48 REQUIREMENTS BULLETIN 737-57-1352