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<tJ--aoEIND Commercial Airplanes 747 Requirements Bulletin -------------ALERT------------- Number: 747-57A2370 RB Original Issue: March 02, 2022 ATA System : 5710 SUBJECT: WINGS - Center Wing - Center Tank Upper Skin Inspection 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 7 40 of the EAR.
ECCN: 9E991 Copyright© 2022 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Unpublished Work .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: March 02, 2022
2.0 7 4 7-57 A2370 RB 1 of 30
ALERT Original Issue: March 02, 2022 REQUIREMENTS BULLETIN 747-57A2370
BLANK PAGE Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
ALERT 747-57A2370 RB 2 of 30
REQUIREMENTS BULLETIN 747-57A2370
ALERT ALERT Table of Contents
1. EFFECTIVITY5
A. Airplanes5
B. Spares Affected8
2. CONCURRENT REQUIREMENTS8
3. COMPLIANCE8
4. APPROVAL9
5. ACCOMPLISHMENT INSTRUCTIONS11
A. General Information11
B. Work Instructions12
FIGURE 6: LEFT SIDE -WING CENTER SECTION UPPER SKIN PANEL BETWEEN STA 1100 AND STA
1120 - LOW FREQUENCY EDDY CURRENT {LFEC) INSPECTION13
FIGURE 7: LEFT SIDE - WING CENTER SECTION UPPER SKIN PANEL BETWEEN STA 1140 AND STA
1160 - LOW FREQUENCY EDDY CURRENT {LFEC) INSPECTION16
FIGURE 8: LEFT SIDE -WING CENTER SECTION UPPER SKIN PANEL BETWEEN STA 1180 AND STA
1200 - LOW FREQUENCY EDDY CURRENT {LFEC) INSPECTION19
FIGURE 11: RIGHT SIDE - WING CENTER SECTION UPPER SKIN PANEL BETWEEN STA 1100 AND
STA 1120 - LOW FREQUENCY EDDY CURRENT {LFEC) INSPECTION22
FIGURE 12: RIGHT SIDE - WING CENTER SECTION UPPER SKIN PANEL BETWEEN STA 1140 AND
STA 1160 - LOW FREQUENCY EDDY CURRENT {LFEC) INSPECTION25
FIGURE 13: RIGHT SIDE - WING CENTER SECTION UPPER SKIN PANEL BETWEEN STA 1180 AND
STA 1200- LOW FREQUENCY EDDY CURRENT {LFEC) INSPECTION28
Original Issue: March 02, 2022 Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
747-57A2370 RB 3 of 30
ALERT Original Issue: March 02, 2022 REQUIREMENTS BULLETIN 747-57A2370
BLANK PAGE Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
ALERT 747-57A2370 RB 4 of 30
<tJ---aoEIND Commercial Airplanes 747 Requirements Bulletin -------------ALERT------------- Number: 747-57A2370 RB Original Issue: March 02, 2022 ATA System: 5710 SUBJECT: WINGS - Center Wing - Center Tank Upper Skin Inspection
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 747-100, 747-100B , 747-100B SUD, 747-200B , 747-200C , 747-200F , 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR Airplane(s), line number(s) 1-1419 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.
The Variable Numbers and Group Information for the applicable airplanes is given below.
GROUP CONFIGURATION DESCRIPTION 1 - 747-100, 747-100B, 747-100B SUD, 747-200B , 747-200C, 747-200F, 747-300, 747-400 , 747-400D , 747-400F , 747SP, 747SR Airplanes Airplane Models :
747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR Variable Number Group Variable Number Group RA001 - RA034 1 RA201 - RA203 1 RA101 - RA115 1 RA216 - RA217 1 RA161 - RA164 1 RA245 - RA246 1 Original Issue: March 02, 2022 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details .
Variable Number Group RA251 - RA266 1 RA301 - RA318 1 RA351 - RA360 1 7 4 7-57 A2370 RB 5 of 30
REQUIREMENTS BULLETIN 747-57A2370 ALERT Variable Number Group Variable Number Group RA369 - RA373 RA401 - RA418 RA501 - RA502 RA521 - RA528 RA532 - RA548 RA551 - RA552 RA559 - RA561 RA581 - RA582 RA585 RA601 - RA602 RA631 - RA635 RA651 - RA652 RA671 - RA677 RA701 - RA702 RA721 - RA731 RA741 - RA745 RA749- RA750 RA761 - RA762 RA781 - RA784 RA901 - RA916 RB001 - RB016 RB041 - RB044 RB071 - RB075 RB101 - RB102 RB411 - RB413 RB421 RB601 - RB607 RB681 - RB697 RB711 RB721 - RB723 RB741 - RB748 RD00 1 - RD004 RD021 - RD022 Original Issue: March 02, 2022 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 RD041 - RD059 1 RD071 - RD072 1 RD081 - RD083 1 RD091 - RD092 1 RD101 - RD104 1 RD121 - RD127 1 RD131 - RD144 1 RD166- RD167 1 RD171 - RD172 1 RD181 - RD183 1 RD201 - RD204 1 RD221 - RD227 1 RD231 - RD235 1 RD241 - RD243 1 RD251 - RD262 1 RD271 - RD272 1 RD291 - RD292 1 RD301 - RD302 1 RD311 1 RD351 - RD358 1 RD361 - RD366 1 RD381 - RD383 1 RD411 - RD414 1 RD421 - RD426 1 RD431 - RD435 1 RD441 - RD442 1 RD451 - RD456 1 RD461 1 RD471 - RD475 1 RD513- RD519 1 RD531 - RD533 1 RD551 1 RD561 1 Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
ALERT Variable Number Group RD571 1 RD581 - RD583 1 RD591 - RD593 1 RD601 - RD607 1 RD621 - RD623 1 RD641 - RD649 1 RD651 - RD659 1 RD661 1 RD671 1 RD681 - RD682 1 RD691 - RD692 1 RD701 - RD702 1 RD721 - RD722 1 RD741 - RD742 1 RD751 - RD755 1 RD761 1 RD771 - RD775 1 RD781 - RD783 1 RD791 - RD792 1 RE001 1 RF001 - RF006 1 RG001 - RG009 1 RG091 1 RG095 1 RG101 - RG104 1 RG121 - RG126 1 RG141 - RG142 1 RG161 - RG164 1 RG171 - RG174 1 RG191 - RG193 1 RG211 - RG213 1 RG221 - RG222 1 RH101 - RH102 1 747-57A2370 RB 6 of 30
REQUIREMENTS BULLETIN 747-57A2370 ALERT Variable Number Group Variable Number Group RH 111 - RH 112 RH121 - RH122 RJ131 - RJ133 RJ151 - RJ152 RJ301 - RJ303 RJ321 - RJ322 RJ331 - RJ333 RL401 - RL403 RL411 - RL436 RL451 - RL456 RL461 - RL462 RL471 - RL481 RL491 - RL492 RL501 - RL502 RL511 - RL516 RL521 - RL522 RL531 - RL534 RL551 RL561 - RL568 RL571 - RL572 RL576 - RL577 RL579 RL581 - RL586 RL651 - RL655 RL671 - RL675 RL681 - RL684 RL751 - RL752 RM001 - RM007 RM010 - RM013 RM021 - RM024 RM026 - RM030 RM036 - RM045 RM051 - RM053 Original Issue: March 02, 2022 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 RM071 1 RM081 - RM084 1 RM091 1 RM096 - RM097 1 RM116 - RM117 1 RM126 - RM132 1 RM136- RM147 1 RM156- RM158 1 RM166 - RM177 1 RM191 - RM192 1 RM231 - RM233 1 RM241 - RM246 1 RM261 - RM264 1 RM316 - RM318 1 RM331 - RM333 1 RM341 1 RM351 - RM355 1 RM366 - RM367 1 RM401 - RM403 1 RM426 1 RM431 1 RM441 - RM443 1 RM445 1 RM801 - RM803 1 RM811 - RM813 1 RM851 - RM859 1 RM861 - RM863 1 RM871 - RM899 1 RM901 - RM906 1 RM911 1 RR001 - RR005 1 RR021 - RR025 1 RR031 1 Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
ALERT Variable Number Group RR201 - RR206 1 RR221 - RR226 1 RR261 - RR267 1 RR301 - RR310 1 RR331 - RR332 1 RR336 1 RR341 - RR345 1 RR361 - RR362 1 RR421 - RR422 1 RR431 - RR432 1 RR441 - RR442 1 RR451 1 RR501 - RR504 1 RR521 - RR522 1 RR526 1 RR531 1 RR551 - RR556 1 RR561 1 RR566 1 RR701 1 RR721 - RR724 1 RR746 - RR748 1 RR851 - RR856 1 RR861 - RR862 1 RR951 - RR952 1 RS001 - RS002 1 RS201 1 RS211 - RS212 1 RS221 - RS222 1 RS231 - RS241 1 RS251 - RS259 1 RS263 1 RS265 - RS268 1 747-57A2370 RB 7 of 30
ALERT Variable Number RS271 - RS276 RS291 - RS292 RS301 - RS306 RS311 - RS320 RS331 - RS333 RS341 - RS342 RS699 RS701 - RS703 RS711 - RS713 RS721 - RS722 RS731 - RS732 RS741 - RS743 RS751 - RS752 RS761 - RS762 RS771 RS781 - RS782 RS786 RT001 - RT014 RT021 - RT022 RT031 - RT035 RT041 - RT04 7 B. Spares Affected None.
REQUIREMENTS BULLETIN 747-57A2370 Group Variable Number Group 1 RT061 1 1 RT071 - RT075 1 1 RT101 - RT103 1 1 RT121 1 1 RT131 - RT137 1 1 RT151 - RT152 1 1 RT161 - RT168 1 1 RT401 - RT412 1 1 RT431 - RT447 1 1 RT451 - RT469 1 1 RT471 - RT499 1 1 RT501 - RT535 1 1 RT551 - RT568 1 1 RT571 - RT591 1 1 RT601 - RT657 1 1 RT671 - RT673 1 1 RT681 - RT682 1 1 RT691 - RT699 1 1 RT701 - RT704 1 1 RT711 - RT717 1 1 RT741 - RT757 1
2. CONCURRENT REQUIREMENTS None.
3. COMPLIANCE ALERT Variable Number Group RT776 - RT777 1 RT781 - RT784 1 RT801 - RT803 1 RT811 - RT814 1 RT831 - RT837 1 RT861 - RT864 1 RT876 - RT880 1 RT931 - RT932 1 RT945 - RT949 1 RT951 - RT955 1 RT966 - RT967 1 RU001 - RU006 1 RU016 - RU017 1 RU031 - RU032 1 RU051 - RU052 1 RU059 - RU062 1 RU081 - RU083 1 RU101 - RU102 1 RU121 - RU132 1 RU801 - RU809 1 RU831 - RU841 1 The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 747-57A2370 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 747-57A2370 RB mandatory.
Original Issue: March 02, 2022 Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
747-57A2370 RB 8 of 30
REQUIREMENTS BULLETIN 747-57A2370
ALERT ALERT Accomplish the required action(s), based on the applicable condition(s) in Table(s) 1, in accordance with Accomplishment Instructions.
Table 1: WING CENTER SECTION UPPER SKIN PANEL - LOW FREQUENCY EDDY CURRENT (LFEC)
INSPECTION Condition Action Boeing Recommended Repeat Interval Compliance Time (Not to Exceed) All Airplanes Do a Low Frequency Ed- Within 16,000 flight hours - dy Current (LFEC) inspec- after the original issue tion of the wing center date of Requirements section upper skin panels Bulletin 747-57A2370 RB for heat damage.
CONDITION 1: ANY HEAT Contact The Boeing Before further flight - DAMAGE FOUND Company for repair instructions and do the repair.
CONDITION 2: NO HEAT No further action re- - - DAMAGE FOUND quired.
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.
Original Issue: March 02, 2022 Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
747-57A2370 RB 9 of 30
ALERT Original Issue: March 02, 2022 REQUIREMENTS BULLETIN 747-57A2370
BLANK PAGE Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
ALERT 747-57A2370 RB 10 of 30
REQUIREMENTS BULLETIN 747-57A2370
ALERT ALERT
5. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL INFORMATION NOTE: 1.
2.
3.
4.
5.
6.
7.
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.
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.
The compliance times for the actions in WORK INSTRUCTIONS are in Compliance.
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.
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.
Use the approved fastener, process, and material substitutions in accordance with SRM Chapter 51.
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 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.
Original Issue: March 02, 2022 Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
747-57A2370 RB 11 of30
ALERT REQUIREMENTS BULLETIN 747-57A2370 ALERT 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.
B. WORK INSTRUCTIONS Actions Required for Compliance
1. Requirements:
Table 1: WING CENTER SECTION UPPER SKIN PANEL - LOW FREQUENCY EDDY CURRENT (LFEC)
INSPECTION Condition All Airplanes CONDITION 1: ANY HEAT
DAMAGE FOUND CONDITION 2: NO HEAT
DAMAGE FOUND Original Issue: March 02, 2022 Action Method of Compliance - - Do a Low Frequency Ed- FIGURE 6 dy Current (LFEC) inspec- FIGURE 7 tion of the wing center FIGURE 8 section upper skin panels FIGURE 11 for heat damage. FIGURE 12 FIGURE 13 Contact The Boeing - Company for repair instructions and do the repair.
- No further action re- - quired.
- Export Controlled ECCN: 9E991 Copyright© Unpublished Work - See page 1 for details.
Refer to the listed procedures in SB 747-57A2370 Original Issue or later approved revisions as an accepted procedure Do PART 1: OPEN ACCESS Do PART2:
PREPARATION - - Do PART3:
CLOSE ACCESS - Do PART3:
CLOSE ACCESS 747-57A2370 RB 12 of 30