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Commercial Airplanes 747 Requirements Bulletin
SPECIAL ATTENTION Number: 747-25-3725 RB Original Issue: October 27, 2020 ATA System: 2500 2552 5317 SUBJECT: EQUIPMENT/FURNISHINGS - Cargo Compartment Insulation Foam - Forward Cargo Compartment Exposed BMS 8-39 Urethane Foam Inspection and Seal Integrity Inspection, and On-Condition 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 © 2020 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Unpublished Work.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: October 27, 2020 747-25-3725 RB 1 of 11
3.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 27, 2020 747-25-3725 RB 2 of 11 REQUIREMENTS BULLETIN 747-25-3725
BLANK PAGE
Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected7
2. CONCURRENT REQUIREMENTS7
3. COMPLIANCE7
4. APPROVAL8
5. ACCOMPLISHMENT INSTRUCTIONS9
A. General Information9
B. Work Instructions10
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 27, 2020 747-25-3725 RB 3 of 11 REQUIREMENTS BULLETIN 747-25-3725
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 27, 2020 747-25-3725 RB 4 of 11 REQUIREMENTS BULLETIN 747-25-3725
BLANK PAGE
Commercial Airplanes 747 Requirements Bulletin
SPECIAL ATTENTION Number: 747-25-3725 RB Original Issue: October 27, 2020 ATA System: 2500 2552 5317 SUBJECT: EQUIPMENT/FURNISHINGS - Cargo Compartment Insulation Foam - Forward Cargo Compartment Exposed BMS 8-39 Urethane Foam Inspection and Seal Integrity Inspection, and On-Condition Replacement 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 747-400, 747-400D, 747-400F Airplane(s), line number(s) 696, 700, 705, 708, 715, 717, 721-723, 725-749, 751, 753-771, 773-775, 777-809, 811-813, 815-817, 819-821, 823-877, 879-885, 887-1374 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.
The Variable Numbers and Group Information for the applicable airplanes is given below.
DESCRIPTIONCONFIGURATIONGROUP 747-400, 747-400D, 747-400F Airplanes that were delivered with BMS 8-39 urethane foam installed in the penetrations through the insulation blankets between Body Station (STA) 960 and STA 1000 in the forward cargo compartment, left and right side.
-1 Airplane Models:
747-400, 747-400D, 747-400F GroupVariable Number 1RF001 - RF006 1RL401 - RL403 GroupVariable Number 1RL411 - RL429 1RL431 - RL436 GroupVariable Number 1RL451 - RL455 1RL461 - RL462 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 27, 2020 747-25-3725 RB 5 of 11
GroupVariable Number 1RL471 - RL472 1RL491 - RL492 1RL501 - RL502 1RL651 - RL655 1RL671 - RL675 1RL681 - RL683 1RL751 - RL752 1RM001 - RM007 1RM010 - RM013 1RM021 - RM024 1RM026 - RM030 1RM036 - RM045 1RM051 - RM053 1RM071 1RM081 - RM084 1RM091 1RM096 - RM097 1RM116 - RM117 1RM126 - RM132 1RM136 - RM147 1RM156 - RM158 1RM166 - RM177 1RM191 - RM192 1RM231 - RM233 1RM241 - RM246 1RM261 - RM264 1RM316 - RM318 1RM331 - RM333 1RM341 1RM351 - RM355 1RM366 - RM367 1RM401 - RM403 GroupVariable Number 1RM426 1RM431 1RM441 - RM443 1RM445 1RM801 - RM803 1RM811 - RM813 1RM851 - RM859 1RM861 - RM863 1RM871 - RM889 1RM891 - RM899 1RM901 - RM906 1RM911 1RR701 1RR721 - RR724 1RR746 - RR748 1RR851 - RR856 1RR861 - RR862 1RR951 - RR952 1RT001 - RT014 1RT021 - RT022 1RT031 - RT035 1RT041 - RT047 1RT061 1RT071 - RT075 1RT101 - RT103 1RT121 1RT131 - RT137 1RT151 - RT152 1RT161 - RT168 1RT401 - RT412 1RT431 - RT447 1RT451 - RT469 GroupVariable Number 1RT471 - RT499 1RT501 - RT535 1RT551 - RT568 1RT571 - RT591 1RT601 - RT657 1RT671 - RT673 1RT681 - RT682 1RT691 - RT699 1RT701 - RT704 1RT711 - RT717 1RT741 - RT757 1RT776 - RT777 1RT781 - RT784 1RT801 - RT803 1RT811 - RT814 1RT831 - RT837 1RT861 - RT864 1RT876 - RT880 1RT931 - RT932 1RT945 - RT949 1RT951 - RT955 1RT966 - RT967 1RU001 - RU006 1RU016 - RU017 1RU031 - RU032 1RU051 - RU052 1RU059 - RU062 1RU081 - RU083 1RU101 - RU102 1RU121 - RU132 1RU801 - RU809 1RU831 - RU841 B. Spares Affected Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 27, 2020 747-25-3725 RB 6 of 11 REQUIREMENTS BULLETIN 747-25-3725
None.
2. CONCURRENT REQUIREMENTS None.
3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 747-25-3725 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 747-25-3725 RB mandatory.
Accomplish the required action(s), based on the applicable condition(s) in Table 1, in accordance with the Accomplishment Instructions.
Table 1: Exposed BMS 8-39 Urethane Foam Inspection and Seal Integrity Inspection, and On- Condition Replacement Repeat Interval (Not to Exceed) Compliance TimeActionCondition -Within 72 months after the Original Issue date of Requirements Bulletin 747-25-3725 RB.
In the forward cargo compartment, between STA 960 and STA 1000 on the left and right sides, do a general visual inspection of all penetrations through the insulation blankets for exposed BMS 8-39 urethane foam and for seal integrity.
All Airplanes -Before further flight.
Replace the seal. Use BMS 1-68 silicone foam to fill all the open spaces.
Use insulation blanket tape to ensure the seal provides a smoke barrier without air space between blankets, tape, foam, system runs and/or wires.
CONDITION 1: ANY PEN-
ETRATION WHERE EX- POSED BMS 8-39 URE- THANE FOAM IS FOUND.
-Before further flight.
Replace the seal. Use BMS 1-68 silicone foam to fill all the open spaces.
Use insulation blanket tape to ensure the seal provides a smoke barrier without air space between blankets, tape, foam, system runs and/or wires.
CONDITION 2: ANY PEN-
ETRATION WHERE EX- POSED BMS 8-39 URE-
THANE FOAM IS NOT
FOUND AND SEAL IN-
TEGRITY IS NOT AC- CEPTABLE.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 27, 2020 747-25-3725 RB 7 of 11 REQUIREMENTS BULLETIN 747-25-3725
Table 1: Exposed BMS 8-39 Urethane Foam Inspection and Seal Integrity Inspection, and On- Condition Replacement Repeat Interval (Not to Exceed) Compliance TimeActionCondition --No further action required at that location only.
CONDITION 3: ANY PEN-
ETRATION WHERE EX- POSED BMS 8-39 URE-
THANE FOAM IS NOT
FOUND AND SEAL IN-
TEGRITY IS ACCEPT- ABLE.
4. APPROVAL NOTE: The approval statement that follows is valid for all affected airplanes, except 747-400D airplanes.
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.
NOTE: The approval statement that follows is valid for 747-400D airplanes.
This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this service bulletin comply with the applicable regulations and are FAA approved for the 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 approved 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: October 27, 2020 747-25-3725 RB 8 of 11 REQUIREMENTS BULLETIN 747-25-3725
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. 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 747-400, -400D, -400F Structural Repair Manual, Chapter 51.
— Values for airframe maintenance tasks are included in Chapter 20 of 747-400 Aircraft Maintenance Manual (AMM).
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.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 27, 2020 747-25-3725 RB 9 of 11 REQUIREMENTS BULLETIN 747-25-3725
7. A General Visual Inspection is defined as: A visual examination of an interior or exterior area, installation or assembly to detect obvious damage, failure or irregularity.
This level of inspection is made from within touching distance, unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may require removal or opening of access panels or doors. Stands, ladders or platforms may be required to gain proximity to the area being checked. Basic cleaning may be required to ensure appropriate visibility.
8. Refer to SWPM 20-10-11 and SWPM 20-10-12 for the wire installation procedures, and SWPM 20-10-19 for the wire separation requirements, as accepted procedures.
9. A seal of acceptable integrity provides a smoke barrier without air space between blankets, tape, foam, system runs and/or wires. The inspection to know the integrity of the seals is to be done by a visual check that looks at a penetration externally. If no air spaces can be seen, that is a seal of acceptable integrity.
B. WORK INSTRUCTIONS Actions Required for Compliance
1. Requirements Table 1: Exposed BMS 8-39 Urethane Foam Inspection and Seal Integrity Inspection, and On-Condition Replacement Refer to the listed procedures in SB 747-25-3725 Original Issue or later approved revisions as an accepted procedure Method of ComplianceActionCondition PART 1: OPEN ACCESS-In the forward cargo compartment, between STA 960 and STA 1000 on the left and right sides, do a general visual inspection of all penetrations through the insulation blankets for exposed BMS 8-39 urethane foam and for seal integrity.
All Airplanes PART 2: FORWARD
CARGO COMPARTMENT
- INSPECTION FOR EX- POSED BMS 8-39 URE-
THANE FOAM AND FOR
SEAL INTEGRITY PART 3: FORWARD
CARGO COMPARTMENT
- EXPOSED BMS 8-39
URETHANE FOAM RE-
PLACEMENT AND SEAL
REPLACEMENT -Replace the seal. Use BMS 1-68 silicone foam to fill all the open spaces.
Use insulation blanket tape to ensure the seal provides a smoke barrier without air space between blankets, tape, foam, system runs and/or wires.
CONDITION 1: ANY PEN-
ETRATION WHERE EX- POSED BMS 8-39 URE- THANE FOAM IS FOUND.
PART 4: CLOSE ACCESS Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 27, 2020 747-25-3725 RB 10 of 11 REQUIREMENTS BULLETIN 747-25-3725
Table 1: Exposed BMS 8-39 Urethane Foam Inspection and Seal Integrity Inspection, and On-Condition Replacement Refer to the listed procedures in SB 747-25-3725 Original Issue or later approved revisions as an accepted procedure Method of ComplianceActionCondition PART 3: FORWARD
CARGO COMPARTMENT
- EXPOSED BMS 8-39
URETHANE FOAM RE-
PLACEMENT AND SEAL
REPLACEMENT -Replace the seal. Use BMS 1-68 silicone foam to fill all the open spaces.
Use insulation blanket tape to ensure the seal provides a smoke barrier without air space between blankets, tape, foam, system runs and/or wires.
CONDITION 2: ANY PEN-
ETRATION WHERE EX- POSED BMS 8-39 URE-
THANE FOAM IS NOT
FOUND AND SEAL IN-
TEGRITY IS NOT AC- CEPTABLE. PART 4: CLOSE ACCESS PART 4: CLOSE ACCESS-No further action required at that location only.
CONDITION 3: ANY PEN-
ETRATION WHERE EX- POSED BMS 8-39 URE-
THANE FOAM IS NOT
FOUND AND SEAL IN-
TEGRITY IS ACCEPT- ABLE.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: October 27, 2020 747-25-3725 RB 11 of 11 REQUIREMENTS BULLETIN 747-25-3725