# Boeing Alert Requirements Bulletin 747-32A2525 RB: No revision named - Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2017-1176; AD 2018-07-06 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Boeing Alert Requirements Bulletin 747-32A2525 RB](https://openairdocs.org/service-documents/boeing/747-32a2525-rb.md) - Title as filed: SB-747-32A2525 RB - Pages: 10 - PDF: https://openairdocs.org/files/sha256/8f/4f/8f4ff90b8386b4abd93ddeecec241d6faa86bd061755f136a5dd57afed3b13be - Page: https://openairdocs.org/service-documents/boeing/747-32a2525-rb/file/8f4ff90b8386 ## Text Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-32A2525 RB Original Issue: September 06, 2017 ATA System: 3240 5300 SUBJECT: LANDING GEAR - Wheels and Brakes - Main Entry Door 3, Intercostal Webs Between STA 1319 and STA 1335 - Drain Hole Installation and 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: BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2017 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 Unpublished Work.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: September 06, 2017 747-32A2525 RB 1 of 10 3.0 ### Page 2 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 06, 2017 747-32A2525 RB 2 of 10 REQUIREMENTS BULLETIN 747-32A2525 ALERTALERT BLANK PAGE ### Page 3 Table of Contents 1. EFFECTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 A. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 B. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2. CONCURRENT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4. APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 B. Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 APPENDIX A: LOCATIONS OF THE TWO DRAIN HOLES IN THE INTERCOSTAL WEB S-18 . . . . . . 9 APPENDIX B: LOCATION OF THE SEALANT APPLICATION ON THE UPPER MAIN SILL WEB AT S-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 06, 2017 747-32A2525 RB 3 of 10 REQUIREMENTS BULLETIN 747-32A2525 ALERTALERT ### Page 4 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 06, 2017 747-32A2525 RB 4 of 10 REQUIREMENTS BULLETIN 747-32A2525 ALERTALERT BLANK PAGE ### Page 5 Commercial Airplanes 747 Requirements Bulletin ALERT Number: 747-32A2525 RB Original Issue: September 06, 2017 ATA System: 3240 5300 SUBJECT: LANDING GEAR - Wheels and Brakes - Main Entry Door 3, Intercostal Webs Between STA 1319 and STA 1335 - Drain Hole Installation and Sealant Application 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 service bulletin is applicable to 747-8 Airplanes, line numbers 1434 thru 1539 in 1 group. B. Spares Affected None. 2. CONCURRENT REQUIREMENTS None. 3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to the Requirements Bulletin (RB). The Airworthiness Directive will make the compliance tasks and times given in the Requirements Bulletin (RB) mandatory. Accomplish the required actions, based on the applicable conditions in Table 1, in accordance with the Accomplishment Instructions. When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When more than one ACTION is given for a CONDITION number or an OPTION number, do all of the ACTION numbers for that CONDITION number or OPTION number. Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 06, 2017 747-32A2525 RB 5 of 10 ### Page 6 Table 1: Main Entry Doors 3L and 3R, Intercostal Webs Between STA 1319 and STA 1335 - Drain Holes Drilling and Sealant Application Repeat Interval (Not to Exceed) Compliance TimeActionCondition -Within 60 months after the original is- sue date of the Re- quirements Bulletin (RB). Drill two drain holes in the intercostal web S-18. Ap- ply sealant at the fore-aft drain path of the upper main sill web at S-16. 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 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 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 06, 2017 747-32A2525 RB 6 of 10 REQUIREMENTS BULLETIN 747-32A2525 ALERTALERT ### Page 7 5. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL INFORMATION NOTE: 3. 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 747 Structural Repair Manual, Chapter 51. — Values for airframe maintenance tasks are included in Chapter 20 of 747 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 747 Aircraft Maintenance Manual (AMM). — Non-standard torque values for maintenance tasks are included in the applicable installation step. 4. Use the approved fastener, process and material substitutions in accordance with SRM Chapter 51. 5. If the length of any fastener specified in this service bulletin does not meet installation standards given in SRM Chapter 51, then a fastener of the same specification, or an approved substitute, with a length which meets the installation standards given in SRM Chapter 51 may be used. In addition, washers may be installed for fastener grip length in accordance with SRM Chapter 51. Refer to SOPM 20-50-01 for alternate full threaded fasteners (screws) needed for installation in this service bulletin. 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. 9. Use of colors in Figures is based on guidance from the ATA e-Business Program (ATA) iSpec 2200. 10. The compliance times for the actions in Paragraph 3.B., WORK INSTRUCTIONS are in Paragraph 1.E., Compliance. 11. 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, Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 06, 2017 747-32A2525 RB 7 of 10 REQUIREMENTS BULLETIN 747-32A2525 ALERTALERT ### Page 8 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. 12. 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. B. WORK INSTRUCTIONS Actions Required for Compliance 1. Requirements Table 1: Main Entry Doors 3L and 3R, Intercostal Webs Between STA 1319 and STA 1335 - Drain Holes Drilling and Sealant Application Refer to the listed proce- dures in SB 747-32A2525 Original Issue or later ap- proved revisions as an accepted procedure: Method of ComplianceActionCondition PART 1: OPEN ACCESS-All Airplanes PART 2: DRILL DRAIN HOLES AND SEALANT APPLICATION APPENDIX ADrill two drain holes in the intercostal web S-18. APPENDIX BApply sealant at the fore-aft drain path of the upper main sill web at S-16. PART 3: CLOSE ACCESS- Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: September 06, 2017 747-32A2525 RB 8 of 10 REQUIREMENTS BULLETIN 747-32A2525 ALERTALERT ### Page 9 (OCR) REQUIREMENTS BULLETIN 747-32A2525 ALERT ALERT SKIN PANEL FWD STA 1319 LEFT SIDE IS SHOWN, RIGHT SIDE IS OPPOSITE 95° 85° _ 0.790 0.530 0.450 DRILL HOLE 0.375 - 0.390 INCH DIAMETER INBD VIEW LOOKING AFT ROTATED 90 DEGREES CLOCKWISE A-A 2583834 APPENDIX A: LOCATIONS OF THE TWO DRAIN HOLES IN THE INTERCOSTAL WEB S-18 (SHEET 1 OF 1) Original Issue: September 06, 2017 Export Controlled ECCN: 9E991 - BOEING 747-32A2525 RB PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9 of 10 ### Page 10 (OCR) REQUIREMENTS BULLETIN 747-32A2525 ALERT ALERT STA 1319 UPPER MAIN SILL FORE-AFT DRAIN PATH ON SILL CANI APPLY SEALANT SURFACE. DO NOT BLOCK (LEFT SIDE IS SHOWN, RIGHT SIDE IS OPPOSITE) SEALANT 0.25 MINIMUM - 0.25 MINIMUM SEALANT FLUSH TYPICAL 2583836 WITH SURFACES A-A APPENDIX B: LOCATION OF THE SEALANT APPLICATION ON THE UPPER MAIN SILL WEB AT S-16 (SHEET 1 OF 1) Original Issue: September 06, 2017 Export Controlled ECCN: 9E991 - BOEING 747-32A2525 RB PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 10 of 10 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.