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Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-57A1353 RB Original Issue: February 10, 2022 ATA System: 5711 SUBJECT: WINGS - Wing Spar - Wing Rear Spar Lower Chord 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 740 of the EAR.

9E991ECCN:

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Unpublished Work.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: February 10, 2022 737-57A1353 RB 1 of 57

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Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

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Table of Contents

1. EFFECTIVITY5

A. Airplanes5

B. Spares Affected10

2. CONCURRENT REQUIREMENTS10

3. COMPLIANCE10

4. APPROVAL13

5. ACCOMPLISHMENT INSTRUCTIONS15

A. General Information15

B. Work Instructions16

FIGURE 3: LEFT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - OPEN HOLE

HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION [Group 2-3]22

FIGURE 4: RIGHT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - OPEN HOLE

HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION [Group 2-3]24

FIGURE 5: LEFT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - FASTENER

INSTALLATION [Group 2, Configuration 1]26

FIGURE 6: RIGHT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - FASTENER

INSTALLATION [Group 2, Configuration 1]30

FIGURE 7: LEFT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - FASTENER

INSTALLATION [Group 2, Configuration 2]34

FIGURE 8: RIGHT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - FASTENER

INSTALLATION [Group 2, Configuration 2]37

FIGURE 9: LEFT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - FASTENER

INSTALLATION [Group 3, Configuration 1]40

FIGURE 10: RIGHT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - FASTENER

INSTALLATION [Group 3, Configuration 1]43

FIGURE 11: LEFT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - FASTENER

INSTALLATION [Group 3, Configuration 2]46

FIGURE 12: RIGHT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - FASTENER

INSTALLATION [Group 3, Configuration 2]49

FIGURE 13: LEFT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - SURFACE

HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AND ULTRASONIC (UT)

INSPECTION [Group 2-3]52

FIGURE 14: RIGHT SIDE - WING REAR SPAR LOWER CHORD AT THE MLG AFT FITTING - SURFACE

HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AND ULTRASONIC (UT)

INSPECTION [Group 2-3]55

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Commercial Airplanes 737 Requirements Bulletin ALERT Number: 737-57A1353 RB Original Issue: February 10, 2022 ATA System: 5711 SUBJECT: WINGS - Wing Spar - Wing Rear Spar Lower Chord 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 737-100, 737-200, 737-200C, 737-300, 737-400, 737-500 Airplane(s), line number(s) 1-3132 in 3 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 737-100/-200/-200C Airplanes, line numbers 1-291-1 737-200/-200C Airplanes-2 737-200/-200C Airplanes that have not been modified in accordance with Service Bulletin 737-57-1216 1 737-200/-200C Airplanes that have been modified in accordance with Service Bulletin 737-57-1216 2 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

Original Issue: February 10, 2022 737-57A1353 RB 5 of 57

DESCRIPTIONCONFIGURATIONGROUP 737-300/-400/-500 Airplanes-3 737-300/-400/-500 Airplanes that have not been modified in accordance with Service Bulletin 737-57-1216 1 737-300/-400/-500 Airplanes that have been modified in accordance with Service Bulletin 737-57-1216 2 Airplane Models:

737-100, 737-200, 737-200C, 737-300, 737-400, 737-500 GroupVariable Number 1PA001 - PA022 1PA099 1PA231 - PA232 1PC001 - PC005 1PG001 - PG075 1PG199 1PG201 - PG230 1PG251 - PG255 1PG271 - PG279 1PG301 - PG314 1PG331 - PG332 1PG351 - PG356 1PG375 1PG401 - PG403 1PG431 - PG442 1PG471 - PG475 1PG501 - PG505 1PG571 - PG583 2PG584 - PG586 1PG621 - PG630 1PG651 - PG652 1PG701 - PG705 GroupVariable Number 2PH001 2PH011 - PH013 2PH021 - PH024 1PH701 - PH715 1PH731 - PH732 1PH741 - PH742 2PH743 1PJ001 - PJ002 2PJ003 - PJ009 1PJ031 - PJ032 1PJ071 - PJ072 1PJ101 - PJ104 2PJ105 - PJ119 2PJ201 - PJ219 3PJ301 - PJ302 3PJ551 - PJ561 3PJ601 - PJ615 3PJ811 3PJ816 - PJ817 2PK026 - PK029 2PK041 - PK053 2PK061 - PK070 GroupVariable Number 2PK081 - PK082 2PK091 - PK099 2PK101 - PK103 2PK111 - PK120 2PK141 - PK146 2PK201 - PK204 2PK211 - PK223 2PK231 - PK241 2PK251 - PK258 2PK271 - PK274 2PK281 - PK289 2PK291 2PK301 - PK318 2PK341 2PK351 - PK361 2PK391 2PK431 - PK433 2PK451 - PK452 2PK461 - PK469 2PK495 2PK501 - PK504 2PK511 - PK515 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

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GroupVariable Number 2PK519 2PK521 - PK528 2PK541 - PK565 2PK581 2PK591 - PK599 2PK601 - PK617 2PK621 - PK637 2PK641 - PK642 2PK661 - PK666 2PK671 - PK681 2PK691 - PK697 2PK711 - PK716 2PK731 - PK765 2PK771 - PK779 2PK801 - PK804 2PK819 - PK827 2PK830 2PK861 - PK863 2PK871 - PK874 2PK881 - PK884 2PK901 - PK938 2PK971 - PK974 2PL001 - PL028 2PL061 2PL081 2PL101 - PL113 2PL151 2PL171 - PL172 2PL201 - PL203 2PL221 2PL401 - PL417 2PL421 2PL441 GroupVariable Number 2PL451 - PL456 2PL471 2PL491 2PL501 - PL506 2PL551 - PL562 2PL581 2PL601 - PL603 2PL611 2PL621 - PL626 2PL631 - PL632 1PL711 - PL712 1PL716 2PL717 - PL747 2PL756 2PL758 2PL761 - PL770 2PL781 - PL788 2PL793 1PL801 - PL803 2PM001 - PM006 2PM016 - PM017 2PM021 - PM023 2PM051 - PM066 2PM101 - PM119 2PM141 - PM142 2PM171 2PM181 2PM251 - PM255 2PM281 - PM283 3PM381 - PM399 3PM401 - PM417 3PM541 - PM564 2PN001 - PN002 GroupVariable Number 2PN021 - PN043 2PN081 - PN086 2PN101 - PN117 2PN131 - PN163 2PN401 - PN420 2PN431 - PN433 2PN451 - PN456 2PN471 - PN474 2PN481 2PN491 - PN493 2PN501 - PN502 2PN511 - PN512 2PN521 3PP001 - PP054 3PP101 - PP169 3PP181 - PP199 3PP201 - PP205 3PP221 3PP231 - PP243 3PP281 - PP286 3PP301 - PP305 3PP351 - PP353 3PP376 - PP384 3PP391 - PP393 3PP401 - PP440 3PP471 - PP475 3PP501 - PP522 3PP631 - PP634 3PP651 - PP652 3PP671 - PP699 3PP701 - PP733 3PP771 - PP779 3PP801 - PP808 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

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GroupVariable Number 3PP821 - PP827 3PP831 - PP848 3PP851 - PP852 3PP861 - PP877 3PP891 - PP899 3PP901 - PP936 3PP946 - PP948 3PP951 - PP952 3PP961 - PP967 3PP981 - PP991 3PP993 3PQ001 - PQ016 3PQ026 - PQ041 3PQ051 - PQ092 3PQ101 - PQ199 3PQ201 - PQ202 3PQ221 - PQ237 3PQ241 - PQ243 3PQ251 - PQ267 3PQ281 - PQ299 3PQ301 - PQ307 3PQ331 - PQ332 3PQ341 - PQ348 3PQ361 - PQ373 3PQ391 - PQ395 3PQ401 - PQ418 3PQ421 3PQ431 - PQ438 3PQ447 - PQ448 3PQ451 3PQ454 3PQ471 - PQ475 3PQ479 - PQ481 GroupVariable Number 3PQ486 - PQ487 3PQ491 - PQ493 3PQ771 - PQ772 3PQ791 - PQ793 3PQ801 - PQ805 3PQ931 - PQ935 3PQ951 3PQ971 - PQ997 3PR001 - PR017 3PR021 - PR034 3PR041 - PR045 3PR061 - PR072 3PR077 - PR082 3PR091 - PR092 3PR096 3PR101 3PR121 - PR122 3PR131 - PR132 3PR141 - PR143 3PR161 - PR172 3PR181 3PS601 - PS631 3PS636 - PS638 3PS641 - PS644 3PS651 - PS657 3PS666 - PS669 3PS691 - PS692 3PS701 - PS706 3PS751 - PS799 3PS811 3PS836 - PS837 3PS841 - PS846 3PS851 - PS852 GroupVariable Number 3PS856 3PS861 - PS863 3PS866 - PS868 3PS871 - PS874 3PS896 - PS897 3PS901 - PS941 3PS956 - PS957 3PS961 - PS963 3PS971 - PS978 3PT001 - PT015 3PT021 - PT031 3PT041 - PT064 3PT101 - PT105 3PT121 - PT138 3PT146 - PT148 3PT161 - PT170 3PT181 - PT188 3PT211 - PT220 3PT295 3PT301 - PT309 3PT331 - PT360 3PT381 - PT399 3PT401 - PT438 3PT501 - PT517 3PT561 - PT565 3PT581 - PT586 3PT611 - PT621 3PT641 - PT644 3PT651 - PT656 3PT671 - PT672 3PT681 - PT685 3PT701 - PT703 3PT716 - PT717 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

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GroupVariable Number 3PT721 - PT725 3PT801 - PT834 3PT851 - PT854 3PT871 - PT886 3PT901 - PT930 3PT971 - PT973 3PT981 - PT985 3PT996 3PU001 - PU025 3PU301 3PU311 - PU313 3PV001 - PV055 3PV201 - PV209 3PV226 - PV229 3PV231 - PV237 3PV271 - PV272 3PV281 - PV287 3PV296 3PV301 - PV302 3PV351 3PV356 - PV357 3PW001 - PW054 3PW061 - PW068 3PW072 3PW086 - PW088 3PW091 - PW094 3PW101 - PW102 3PW106 3PW111 - PW120 3PW156 - PW157 3PW161 - PW171 3PW201 - PW252 3PW261 - PW268 GroupVariable Number 3PW271 - PW276 3PW278 3PW281 - PW293 3PW296 3PW301 - PW327 3PW401 - PW408 3PW411 - PW418 3PW421 - PW424 3PW431 - PW435 3PW441 - PW450 3PW461 - PW467 3PW501 - PW504 3PW511 - PW522 3PW524 - PW550 3PW556 - PW557 3PW561 - PW564 3PW571 - PW576 3PW591 - PW596 3PW611 - PW622 3PW631 - PW637 3PW661 - PW662 3PW681 - PW683 3PW701 - PW702 3PW711 - PW717 3PW741 - PW742 3PW761 3PW771 3PW831 3PW851 - PW856 1PX071 1PX701 1PY001 - PY008 1PY021 GroupVariable Number 2PY022 1PY031 2PY036 - PY037 2PY046 - PY048 2PY051 - PY053 2PY056 - PY057 2PY101 - PY103 2PY111 - PY113 2PY131 - PY135 2PY141 - PY143 2PY151 - PY154 2PY156 - PY157 2PY161 - PY162 2PY166 2PY191 2PY201 2PY221 - PY222 2PY231 2PY241 - PY244 2PY270 - PY275 2PY281 2PY286 1PY301 - PY304 1PY321 - PY323 1PY341 - PY346 1PY361 - PY362 1PY381 2PY401 2PY409 - PY411 2PY421 - PY422 2PY441 2PY451 2PY461 - PY463 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

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GroupVariable Number 2PY591 - PY595 2PY611 - PY612 2PY621 GroupVariable Number 2PY631 2PY651 2PY671 - PY672 GroupVariable Number 2PY721 2PY741 -- B. Spares Affected None.

2. CONCURRENT REQUIREMENTS None.

3. COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements Bulletin 737-57A1353 RB. The Airworthiness Directive will make the compliance tasks and times given in Requirements Bulletin 737-57A1353 RB mandatory.

Accomplish the required actions, based on the applicable conditions in Table 1, in accordance with 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 or an OPTION, do all of the ACTION numbers for that CONDITION or OPTION.

Group 1:

Boeing endorses the FAA rules related to Limit of Validity (LOV) and recommends immediate and permanent removal from service of any airplanes upon reaching the LOV, whether or not it is operated under FAA jurisdiction. As such, Boeing no longer provides maintenance instructions for airplanes that have accumulated flight cycles beyond the LOV. Airplanes in Group 1 (line numbers 1-291) have accumulated flight cycles beyond the LOV of the maintenance program. 14 CFR 121.1115 and 129.115 prohibit operation of an airplane beyond its LOV.

Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

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Group 2-3:

Table 1: Open Hole High Frequency Eddy Current (HFEC) Inspection or Surface HFEC and Ultrasonic (UT) Inspection of the Wing Rear Spar Lower Chord at the Main Landing Gear (MLG) Aft Fitting at Wing Buttock Line (WBL) 157 Left and Right Side Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Within 4,500 flight cycles after the Original Issue date of Requirements Bulletin 737- 57A1353 RB.

Before 50,000 Total Flight Cycles.

OPTION 1: Do an open hole High Frequency Eddy Current (HFEC) inspection of the wing rear spar lower chord at the Main Landing Gear (MLG) aft fitting at Wing Buttock Line (WBL) 157 for any crack.

All Airplanes.

OPTION 2: Do a surface HFEC inspection and ultrasonic (UT) inspection of the wing rear spar lower chord at the MLG aft fitting at WBL 157 for any crack.

-Before further flight.CONDITION 1 (ACTION 1):

Contact The Boeing Company for repair instructions and do the repair.

CONDITION 1: ANY

CRACK FOUND DURING OPTION 1

OPEN HOLE HFEC INSPECTION. -Before further flight.CONDITION 1 (ACTION 2): Install fasteners.

24,000 flight cycles.

-CONDITION 1 (ACTION 3) (OPTION 1): Repeat open hole HFEC inspection of the wing rear spar lower chord at the MLG aft fitting at WBL 157 for any crack. (a)(b) -Within 24,000 flight cycles after most recent OPTION 1 open hole HFEC inspection.

CONDITION 1 (ACTION 3) (OPTION 2) Do a surface HFEC inspection and UT inspection of the wing rear spar lower chord at the MLG aft fitting at WBL 157 for any crack. (a)(b) Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

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Group 2-3:

Table 1: Open Hole High Frequency Eddy Current (HFEC) Inspection or Surface HFEC and Ultrasonic (UT) Inspection of the Wing Rear Spar Lower Chord at the Main Landing Gear (MLG) Aft Fitting at Wing Buttock Line (WBL) 157 Left and Right Side Repeat Interval (Not to Exceed) Boeing Recommended Compliance Time (Whichever Occurs Later) ActionCondition -Before further flight.CONDITION 2: (ACTION 1): Install fasteners.

CONDITION 2: NO

CRACK FOUND DURING OPTION 1

OPEN HOLE HFEC INSPECTION.

24,000 flight cycles.

-CONDITION 2 (ACTION 2) (OPTION 1): Repeat open hole HFEC inspection of the wing rear spar lower chord at the MLG aft fitting at WBL 157 for any crack. (a)(b) -Within 24,000 flight cycles after most recent OPTION 1 open hole HFEC inspection.

CONDITION 2 (ACTION 2) (OPTION 2): Do a surface HFEC inspection and UT inspection of the wing rear spar lower chord at the MLG aft fitting at WBL 157 for any crack. (a)(b) -Before further flight.CONDITION 3 (ACTION 1):

Contact The Boeing Company for repair instructions and do the repair.

CONDITION 3: ANY

CRACK FOUND DURING OPTION 2

SURFACE HFEC

AND UT INSPEC- TION. -Within 9,000 flight cycles aftermost recent OPTION 2 surface HFEC and UT inspections.

CONDITION 3 (ACTION 2) (OPTION 1): Do an open hole HFEC inspection of the wing rear spar lower chord at the MLG aft fitting at WBL 157 for any crack. (a)(b) 9,000 flight cycles.-CONDITION 3 (ACTION 2) (OPTION 2): Repeat surface HFEC inspection and UT inspection of the wing rear spar lower chord at the MLG aft fitting at WBL 157 for any crack. (a)(b) Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.

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