# Boeing Alert Requirements Bulletin 737-38A1072 RB: No revision named

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2022-1068; AD 2023-04-17 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Requirements Bulletin 737-38A1072 RB](https://openairdocs.org/service-documents/boeing/737-38a1072-rb.md)
- Title as filed: 737-38A1072 RB
- Pages: 28
- PDF: https://openairdocs.org/files/sha256/08/ff/08fffc7a0895ad64d2a567b9b98ce0c1b865134ed7e99345178e166ce46681d0
- Page: https://openairdocs.org/service-documents/boeing/737-38a1072-rb/file/08fffc7a0895

## 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
737
Requirements Bulletin
ALERT
Number: 737-38A1072 RB
Original Issue: February 25, 2022
ATA System: 3800 2825
SUBJECT: FUEL - APU Fuel Feed System - APU Fuel Feed Line Shroud 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Unpublished Work.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 25, 2022
737-38A1072 RB
1 of 28
5.0

### Page 2

Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
2 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT
BLANK PAGE

### Page 3

Table of Contents
1. EFFECTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
A. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
B. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2. CONCURRENT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4. APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
B. Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
FIGURE 1: APU FUEL LINE SHROUD - INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . 22
FIGURE 2: PRESSURE SWITCH WIRE CLAMP - INSPECTION . . . . . . . . . . . . . . . . . . . . 25
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
3 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 4

Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
4 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT
BLANK PAGE

### Page 5

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-38A1072 RB
Original Issue: February 25, 2022
ATA System: 3800 2825
SUBJECT: FUEL - APU Fuel Feed System - APU Fuel Feed Line Shroud 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 737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER
Airplane(s), line number(s) 1-2598, 2600-2721, 2723-2813, 2815-2930, 2932-3068, 3070-3323,
3325-3425, 3427-3521, 3523-3611, 3613-3701, 3703-3791, 3793-3878, 3880-3915, 3917-3968,
3970-4013, 4015-4054, 4056-4098, 4100-4140, 4142-4180, 4182-4218, 4220-4255, 4257-4293,
4295-4330, 4332-4365, 4367-4398, 4400-4444, 4446-4480, 4482-4546, 4548-4608, 4610-4672,
4674-4727, 4729-4767, 4769-4812, 4814-4858, 4860-4897, 4899-4937, 4939-4977, 4979-5019,
5021-5057, 5059-5097, 5099-5137, 5139-5177, 5179-5217, 5219-5261, 5263-5297, 5299-5337,
5339-5367, 5369-5397, 5399-5427, 5429-5457, 5459-5477, 5479-5509, 5511-5541, 5543-5566,
5568-5586, 5588-5601, 5603-5622, 5624-5655, 5657-5667, 5669-5679, 5681-5711, 5713-5727,
5729-5739, 5741-5764, 5766-5787, 5789-5795, 5797-5822, 5824-5850, 5853-5879, 5881-5901,
5904-5935, 5937-5947, 5949-5962, 5964-5991, 5994-6019, 6021-6033, 6035-6047, 6049-6073,
6075, 6077-6103, 6105-6113, 6115-6131, 6133-6153, 6155-6159, 6161-6187, 6190-6215,
6217-6221, 6223-6243, 6245-6249, 6251-6271, 6274-6289, 6291-6299, 6301-6307, 6309-6325,
6327, 6329-6343, 6345-6355, 6357-6359, 6361-6371, 6373-6383, 6386-6395, 6397-6407,
6409-6411, 6413-6419, 6421-6429, 6431-6439, 6442-6447, 6449-6455, 6457-6463, 6465-6467,
6469-6471, 6473-6480, 6482-6489, 6491, 6493-6498, 6500-6507, 6509-6514, 6516-6520,
6522-6527, 6529-6531, 6533-6534, 6536-6541, 6543-6547, 6549-6554, 6556-6559, 6561,
6563-6568, 6570-6574, 6576-6581, 6583-6588, 6590-6593, 6596-6597, 6599-6602, 6604-6606,
6608-6611, 6613-6615, 6617-6620, 6622, 6624, 6626-6629, 6631-6633, 6635-6638, 6640-6642,
6644-6647, 6649-6651, 6653-6656, 6659-6660, 6662-6665, 6667-6671, 6673-6676, 6678-6680,
6682-6685, 6688-6689, 6691-6694, 6696-6698, 6700-6703, 6705-6707, 6709-6712, 6714-6716,
6718-6719, 6721, 6723-6725, 6727-6730, 6732-6734, 6736-6739, 6741-6743, 6745-6748,
6751-6752, 6754-6757, 6759-6761, 6763-6766, 6768-6770, 6772-6775, 6777-6779, 6781-6782,
6786-6788, 6790 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.
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
5 of 28

### Page 6

The Variable Numbers and Group Information for the applicable airplanes is given below. An
equivalent change is on subsequent production airplanes.
DESCRIPTIONCONFIGURATIONGROUP
737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER
Airplanes delivered with potential APU Fuel Line Shroud chafing
condition
-1
Airplane Models:
737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER
GroupVariable Number
1YA001 - YA099
1YA101 - YA199
1YA201 - YA211
1YA221
1YA231 - YA242
1YA251 - YA256
1YA271 - YA272
1YA291
1YA301 - YA302
1YA311 - YA314
1YA321 - YA323
1YA336 - YA345
1YA351
1YA356 - YA357
1YA366 - YA367
1YA371 - YA377
1YA501 - YA536
1YA541 - YA552
1YA571 - YA578
1YA601 - YA615
1YA621 - YA622
1YA626 - YA631
1YA635 - YA636
GroupVariable Number
1YA641 - YA642
1YA645 - YA650
1YA656 - YA659
1YA666 - YA667
1YA671 - YA672
1YA681 - YA691
1YA701 - YA710
1YA721 - YA722
1YA731 - YA734
1YA751 - YA756
1YA801 - YA803
1YA809
1YA811 - YA814
1YA831 - YA835
1YA841 - YA862
1YA881 - YA882
1YA891 - YA892
1YA961 - YA978
1YB001 - YB006
1YB101 - YB132
1YB151 - YB153
1YB156 - YB158
1YB161 - YB164
GroupVariable Number
1YB171 - YB172
1YB181 - YB184
1YB201 - YB208
1YB271
1YB276
1YB301 - YB310
1YB371 - YB392
1YB501 - YB502
1YB521 - YB526
1YB541 - YB544
1YB551
1YB561 - YB598
1YB601 - YB636
1YB651
1YB656
1YB671 - YB672
1YB851 - YB863
1YB871 - YB874
1YB881 - YB893
1YB901 - YB903
1YB911
1YB961 - YB975
1YB981
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
6 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 7

GroupVariable Number
1YB986 - YB998
1YC001 - YC030
1YC051 - YC084
1YC091 - YC095
1YC101 - YC104
1YC111 - YC113
1YC121
1YC126 - YC127
1YC136 - YC141
1YC146 - YC147
1YC151 - YC156
1YC166 - YC171
1YC176 - YC179
1YC186 - YC190
1YC201 - YC203
1YC206 - YC207
1YC301 - YC305
1YC321 - YC387
1YC391 - YC394
1YC396
1YC401 - YC417
1YC421 - YC422
1YC426 - YC428
1YC436 - YC439
1YC441 - YC448
1YC451 - YC455
1YC459
1YC461 - YC467
1YC471 - YC499
1YC501 - YC526
1YC571 - YC583
1YC587 - YC589
1YC591 - YC593
GroupVariable Number
1YC601 - YC655
1YC681 - YC696
1YC701 - YC715
1YC720 - YC725
1YC727 - YC752
1YC761 - YC770
1YC781 - YC793
1YC801 - YC892
1YC901 - YC907
1YC921 - YC922
1YC931 - YC932
1YC941 - YC951
1YC971 - YC978
1YC981 - YC983
1YD001 - YD007
1YD021 - YD025
1YD041 - YD057
1YD081 - YD084
1YD101 - YD117
1YD121 - YD126
1YD151 - YD159
1YD171 - YD172
1YD201 - YD203
1YD206 - YD209
1YD216 - YD219
1YD251 - YD254
1YD256 - YD257
1YD261
1YD301 - YD334
1YD391
1YD401 - YD410
1YD412 - YD422
1YD481 - YD485
GroupVariable Number
1YD491 - YD499
1YD501 - YD512
1YD531 - YD535
1YD541 - YD547
1YD561 - YD564
1YD571 - YD572
1YD591 - YD595
1YD601 - YD612
1YD651 - YD655
1YE001 - YE020
1YE051
1YE101 - YE109
1YE151 - YE157
1YE171 - YE172
1YE201 - YE206
1YE301 - YE305
1YE321 - YE326
1YE371 - YE383
1YF001 - YF011
1YF021 - YF049
1YF051 - YF080
1YF086 - YF087
1YF106 - YF107
1YF111 - YF114
1YF116 - YF119
1YF121 - YF132
1YF176 - YF178
1YF191 - YF192
1YF201 - YF276
1YF401 - YF402
1YF431 - YF432
1YF436 - YF437
1YF441 - YF442
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
7 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 8

GroupVariable Number
1YF451 - YF460
1YF501 - YF599
1YF601 - YF685
1YF691 - YF695
1YF701 - YF707
1YF801 - YF805
1YF831 - YF832
1YF836 - YF838
1YF871 - YF872
1YF901 - YF905
1YF921 - YF928
1YF951 - YF954
1YG001 - YG044
1YG061 - YG064
1YG066 - YG089
1YG091 - YG099
1YG101 - YG104
1YG111 - YG114
1YG116 - YG147
1YG201 - YG205
1YG211 - YG214
1YG221 - YG224
1YG251 - YG252
1YG501 - YG515
1YG601 - YG602
1YG701
1YG711
1YG721 - YG722
1YH001 - YH012
1YH031 - YH055
1YH071 - YH080
1YH101 - YH132
1YH201 - YH202
GroupVariable Number
1YH206 - YH207
1YH301 - YH307
1YH321 - YH322
1YH501 - YH542
1YH551 - YH594
1YH601 - YH606
1YH611 - YH620
1YH631 - YH632
1YH636 - YH637
1YH641
1YH681 - YH685
1YH701 - YH755
1YH801 - YH889
1YH901 - YH908
1YH911 - YH915
1YH951 - YH952
1YJ001 - YJ013
1YJ021
1YJ471 - YJ480
1YJ501 - YJ517
1YJ531 - YJ579
1YJ591 - YJ599
1YJ631 - YJ632
1YJ671 - YJ694
1YJ801 - YJ867
1YJ871 - YJ880
1YJ901 - YJ904
1YJ908 - YJ929
1YJ931 - YJ937
1YJ941 - YJ956
1YJ961
1YJ976 - YJ977
1YK001 - YK007
GroupVariable Number
1YK101 - YK104
1YK111 - YK112
1YK121 - YK122
1YK131 - YK133
1YK136 - YK139
1YK141 - YK142
1YK146 - YK148
1YK151 - YK154
1YK161 - YK167
1YK171
1YK176 - YK177
1YK186
1YK191
1YK196
1YK201 - YK202
1YK301 - YK314
1YK321 - YK340
1YK361 - YK378
1YK401 - YK406
1YK426 - YK427
1YK431 - YK450
1YK456 - YK467
1YK471 - YK473
1YK476
1YK478
1YK480 - YK487
1YK491 - YK493
1YK495 - YK499
1YK511 - YK516
1YK521 - YK530
1YK551 - YK571
1YK576 - YK577
1YK580 - YK585
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
8 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 9

GroupVariable Number
1YK601 - YK602
1YK606 - YK607
1YK611 - YK616
1YK621 - YK634
1YK641 - YK644
1YK651 - YK665
1YK671 - YK672
1YK676 - YK677
1YK681 - YK686
1YK691
1YK695 - YK699
1YK701 - YK713
1YK716 - YK719
1YK721 - YK741
1YK751 - YK770
1YK776 - YK778
1YK781 - YK785
1YK791 - YK792
1YK796 - YK797
1YK801 - YK899
1YK901 - YK912
1YK918 - YK919
1YK921 - YK929
1YK941 - YK999
1YL001 - YL005
1YL011 - YL016
1YL021 - YL024
1YL051 - YL052
1YL056 - YL057
1YL061
1YL066 - YL069
1YL076 - YL077
1YL101 - YL137
GroupVariable Number
1YL201 - YL237
1YL241 - YL242
1YL271 - YL272
1YL281 - YL284
1YL301 - YL303
1YL311 - YL314
1YL316 - YL321
1YL351 - YL353
1YL371 - YL374
1YL401
1YL421 - YL429
1YL431 - YL444
1YL461 - YL478
1YL501 - YL509
1YL531 - YL534
1YL541 - YL551
1YL561 - YL579
1YL591 - YL598
1YL601 - YL606
1YL611 - YL612
1YL616 - YL617
1YL621
1YL626
1YL631 - YL634
1YL636 - YL637
1YL661 - YL664
1YL676 - YL691
1YL696 - YL697
1YL701 - YL707
1YL731
1YL751 - YL752
1YL756 - YL757
1YL761 - YL780
GroupVariable Number
1YL796 - YL797
1YL801 - YL815
1YL901 - YL910
1YL921 - YL940
1YL951 - YL968
1YM101 - YM103
1YM201 - YM244
1YM251 - YM299
1YM301 - YM399
1YM401 - YM415
1YM471
1YM481 - YM484
1YM501 - YM515
1YM521 - YM522
1YM541
1YM551 - YM553
1YM571 - YM572
1YM581 - YM582
1YM591 - YM599
1YM631 - YM634
1YM641 - YM652
1YM671 - YM674
1YM691 - YM699
1YM701 - YM710
1YM761 - YM765
1YM771 - YM779
1YN001 - YN016
1YN021 - YN024
1YN061
1YN071 - YN082
1YN091 - YN092
1YN101 - YN112
1YN121
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
9 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 10

GroupVariable Number
1YN126
1YN201 - YN202
1YN211 - YN219
1YN231 - YN236
1YN261
1YN501
1YN531 - YN534
1YN551 - YN566
1YN581 - YN585
1YN591 - YN593
1YN601 - YN606
1YN651 - YN653
1YN661 - YN663
1YN666 - YN667
1YN671 - YN673
1YN701 - YN702
1YN741 - YN746
1YN756 - YN758
1YQ001 - YQ003
1YQ011 - YQ021
1YQ026 - YQ029
1YQ036 - YQ045
1YQ201 - YQ207
1YQ231
1YQ241 - YQ251
1YQ281 - YQ284
1YQ291 - YQ296
1YQ301 - YQ302
1YQ321 - YQ324
1YQ331 - YQ334
1YQ346 - YQ347
1YQ351 - YQ367
1YQ371
GroupVariable Number
1YQ401 - YQ403
1YQ451 - YQ454
1YQ456
1YQ461
1YQ471
1YQ501 - YQ520
1YQ601 - YQ603
1YQ606
1YQ610 - YQ614
1YR001 - YR098
1YR101 - YR105
1YR111 - YR124
1YR126 - YR144
1YR166 - YR182
1YR186 - YR198
1YR201 - YR215
1YR231 - YR294
1YR296 - YR297
1YR301 - YR334
1YR338 - YR341
1YR361 - YR366
1YR371 - YR373
1YR376 - YR377
1YR381 - YR382
1YR386 - YR388
1YR391
1YR396 - YR399
1YR401 - YR405
1YR411 - YR413
1YR416 - YR418
1YR421 - YR424
1YR426 - YR455
1YR457 - YR499
GroupVariable Number
1YR501 - YR506
1YR511 - YR520
1YR526 - YR544
1YR546 - YR551
1YR556 - YR562
1YR571 - YR582
1YR591 - YR592
1YR601 - YR605
1YR616 - YR658
1YR661 - YR663
1YR671 - YR673
1YR676 - YR678
1YR681 - YR682
1YR701 - YR769
1YR771 - YR799
1YR801 - YR827
1YR831 - YR838
1YR841 - YR899
1YR901 - YR903
1YR931 - YR934
1YR938 - YR944
1YR951 - YR998
1YS001 - YS002
1YS006 - YS009
1YS031 - YS032
1YS051 - YS073
1YS101 - YS120
1YS126 - YS142
1YS146 - YS160
1YS166 - YS194
1YS196 - YS197
1YS201 - YS209
1YS221 - YS225
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
10 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 11

GroupVariable Number
1YS231 - YS236
1YS271 - YS288
1YS295 - YS296
1YS301 - YS348
1YS351 - YS378
1YS381 - YS383
1YS401
1YS451
1YS456 - YS457
1YS462 - YS465
1YS467
1YS501 - YS502
1YS506
1YS511 - YS518
1YS531
1YS536 - YS538
1YS541 - YS542
1YS546
1YS551 - YS556
1YS561 - YS578
1YS581 - YS595
1YS601 - YS690
1YS701 - YS713
1YS721 - YS762
1YS771 - YS780
1YS806 - YS810
1YS816 - YS818
1YS823 - YS825
1YS851 - YS863
1YS876
1YS881 - YS883
1YS891
1YS896 - YS897
GroupVariable Number
1YS901 - YS909
1YS911 - YS957
1YS961 - YS974
1YS976 - YS977
1YS981 - YS987
1YS991 - YS998
1YT001 - YT004
1YT006
1YT026 - YT027
1YT031 - YT032
1YT036 - YT038
1YT061 - YT068
1YT101 - YT138
1YT176 - YT185
1YT191
1YT196 - YT199
1YT201
1YT206 - YT207
1YT211 - YT213
1YT251 - YT299
1YT301 - YT307
1YT311 - YT312
1YT321 - YT355
1YT371 - YT372
1YT381
1YT391 - YT396
1YT401 - YT403
1YT411 - YT417
1YT427
1YT461 - YT477
1YT491 - YT492
1YT501 - YT521
1YT551 - YT552
GroupVariable Number
1YT556 - YT563
1YT565
1YT571 - YT576
1YT601 - YT606
1YT701 - YT708
1YT761 - YT781
1YT791 - YT794
1YT796 - YT797
1YT801 - YT804
1YT811 - YT813
1YT826 - YT827
1YT831 - YT832
1YT841 - YT852
1YT856 - YT863
1YT885 - YT887
1YT891 - YT895
1YT901 - YT994
1YU001 - YU060
1YU201 - YU216
1YU301 - YU317
1YV001 - YV004
1YV006 - YV012
1YV021 - YV023
1YV030 - YV034
1YV037 - YV042
1YV045 - YV047
1YV051 - YV057
1YV081
1YV083 - YV084
1YV097 - YV099
1YV101 - YV154
1YV201 - YV202
1YV251 - YV252
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
11 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 12

GroupVariable Number
1YV256 - YV257
1YV301 - YV312
1YV351 - YV368
1YV381 - YV388
1YV391 - YV394
1YV401
1YV411 - YV412
1YV431 - YV433
1YV441 - YV453
1YV461 - YV462
1YV467 - YV468
1YV501 - YV506
1YV521
1YV571 - YV583
1YV601 - YV605
1YV651 - YV664
1YV695 - YV696
1YV711
1YV722 - YV731
1YV741 - YV775
GroupVariable Number
1YV781 - YV789
1YV801 - YV815
1YV831 - YV832
1YV881 - YV883
1YV901 - YV915
1YV923 - YV926
1YV971 - YV980
1YW001
1YW011 - YW099
1YW101 - YW121
1YW201 - YW202
1YW226 - YW240
1YW245 - YW254
1YW261
1YW263
1YW267 - YW281
1YW283 - YW285
1YW292 - YW299
1YW351
1YW356 - YW358
GroupVariable Number
1YW361 - YW363
1YW371 - YW394
1YW401 - YW415
1YW441 - YW442
1YW451 - YW452
1YW471 - YW472
1YW491 - YW493
1YW531 - YW532
1YW551 - YW561
1YW585 - YW591
1YW595 - YW596
1YW601
1YW616 - YW619
1YW666
1YW881
1YW891 - YW893
1YW906 - YW907
1YW916 - YW918
1YW921
1YW971 - YW976
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 737-38A1072 RB. The Airworthiness Directive will make the compliance tasks and
times given in Requirements Bulletin 737-38A1072 RB mandatory.
Accomplish the required action(s), based on the applicable condition(s) in Table 1, in accordance with
Accomplishment Instructions.
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
12 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 13

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.
Table 1: Inspection of the APU Fuel Line Shroud and the Pressure Switch Wire Clamp
Repeat Interval (Not to
Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Within 36 months after the
Original Issue date of Re-
quirements Bulletin 737-
38A1072 RB.
ACTION 1: Do a general
visual inspection of the
APU fuel line shroud in the
area within 3 inches of the
fastener of the pressure
switch wire clamp for any
damage.(a)
All Airplanes
ACTION 2: Do a detailed
inspection of the pressure
switch wire clamp to deter-
mine if the fastener of the
pressure switch wire clamp
is installed with the bolt
head on top and the nut on
the bottom and that there
is a minimum 1.5 inches of
horizontal separation be-
tween the fastener of the
pressure switch wire clamp
and the APU fuel line
shroud.
-Before further flightReplace existing APU fuel
line shroud with new or re-
paired shroud.
CONDITION 1: ANY
CRACK OR HOLE IS
FOUND ON THE APU
FUEL LINE SHROUD
DURING ACTION 1 IN-
SPECTION.
-Before further flightCONDITION 2 (OPTION
1):
CONDITION 2: ANY
DAMAGE FOUND THAT
EXPOSES BARE METAL
ON THE APU FUEL LINE
SHROUD DURING AC-
TION 1 INSPECTION.
Repair damage to the exist-
ing APU fuel line shroud.
-Before further flightCONDITION 2 (OPTION
2):
Replace existing APU fuel
line shroud with new or re-
paired shroud.
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
13 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 14

Table 1: Inspection of the APU Fuel Line Shroud and the Pressure Switch Wire Clamp
Repeat Interval (Not to
Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Before further flightReplace existing APU fuel
line shroud with new or re-
paired shroud.
CONDITION 3: ANY DENT
DAMAGE FOUND THAT
DECREASES THE OUT-
SIDE DIAMETER OF THE
SHROUD MORE THAN
0.031 INCH DURING AC-
TION 1 INSPECTION.
--No further action required
on the APU Fuel Line
Shroud
CONDITION 4: NO DAM-
AGE IS FOUND ON THE
APU FUEL LINE SHROUD
DURING ACTION 1 IN-
SPECTION.
-Before further flightCONDITION 5 (ACTION
1):
CONDITION 5: FASTEN-
ER OF THE PRESSURE
SWITCH WIRE CLAMP IS
NOT FOUND TO BE IN-
STALLED WITH THE
BOLT HEAD ON TOP
AND THE NUT ON THE
BOTTOM DURING AC-
TION 2 INSPECTION.
Re-install the fastener of
the pressure switch wire
clamp with the bolt head
on top and the nut on the
bottom.
-Before further flightCONDITION 5 (ACTION
2):
Re-install the pressure
switch wire clamp assem-
bly to make sure there is
1.5 inches minimum of
horizontal separation be-
tween the fastener of the
pressure switch wire clamp
and the APU fuel line
shroud.
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
14 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 15

Table 1: Inspection of the APU Fuel Line Shroud and the Pressure Switch Wire Clamp
Repeat Interval (Not to
Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Before further flightRe-install the pressure
switch wire clamp assem-
bly to make sure there is
1.5 inches minimum of
horizontal separation be-
tween the fastener of the
pressure switch wire clamp
and the APU fuel line
shroud. Make sure to
maintain the orientation of
the fastener, having the
bolt head on top and the
nut on the bottom.
CONDITION 6: FASTEN-
ER OF THE PRESSURE
SWITCH WIRE CLAMP IS
FOUND TO BE IN-
STALLED WITH THE
BOLT HEAD ON TOP
AND THE NUT ON THE
BOTTOM, BUT THE
HORIZONTAL SEPARA-
TION BETWEEN THE
FASTENER OF THE
PRESSURE SWITCH
WIRE CLAMP AND THE
APU FUEL LINE SHROUD
IS NOT A MINIMUM OF
1.5 INCHES DURING AC-
TION 2 INSPECTION
--No further action required
on the fastener of the
pressure switch wire clamp
CONDITION 7: FASTEN-
ER OF THE PRESSURE
SWITCH WIRE CLAMP IS
FOUND TO BE IN-
STALLED WITH THE
BOLT HEAD ON TOP
AND THE NUT ON THE
BOTTOM AND THE HOR-
IZONTAL SEPARATION
IS A MINIMUM OF 1.5
INCHES DURING ACTION
2 INSPECTION
(a) Damage is defined as: any crack or hole, any damage that exposes bare metal on the APU fuel line shroud,
and any dent damage found that decreases the outside diameter of the shroud by more than 0.031 inch.
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.
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
15 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 16

Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
16 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT
BLANK PAGE

### Page 17

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 737 Structural Repair Manual,
Chapter 51.
— 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.
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
17 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 18

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. A Detailed Inspection is defined as: An intensive examination of a specific item,
installation or assembly to detect damage, failure or irregularity. This could include
tactile assessment in which a component or assembly can be checked for
tightness/security. Available lighting is normally supplemented with a direct source
of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors
and magnifying lenses may be necessary. Surface cleaning and elaborate access
procedures may be required.
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. 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.
B. WORK INSTRUCTIONS
Actions Required for Compliance
1. Requirements
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
18 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 19

Table 1: Inspection of the APU Fuel Line Shroud and the Pressure Switch Wire Clamp
Refer to the listed proce-
dures in SB 737-38A1072
Original Issue or later
approved revisions as an
accepted procedure
Method of ComplianceActionCondition
PART 1: OPEN ACCESS--All Airplanes
-FIGURE 1ACTION 1: Do a general
visual inspection of the
APU fuel line shroud in the
area within 3 inches of the
fastener of the pressure
switch wire clamp for any
damage.(a)
-FIGURE 2ACTION 2: Do a detailed
inspection of the pressure
switch wire clamp to deter-
mine if the fastener of the
pressure switch wire clamp
is installed with the bolt
head on top and the nut on
the bottom and that there
is a minimum 1.5 inches of
horizontal separation be-
tween the fastener of the
pressure switch wire clamp
and the APU fuel line
shroud.
PART 2: APU FUEL LINE
SHROUD REPAIR AND
REPLACEMENT
-Replace existing APU fuel
line shroud with new or re-
paired shroud.
CONDITION 1: ANY
CRACK OR HOLE IS
FOUND ON THE APU
FUEL LINE SHROUD
DURING ACTION 1 IN-
SPECTION.
PART 3: BLEND-OUT RE-
PAIR LIMITS
-CONDITION 2 (OPTION
1):
CONDITION 2: ANY
DAMAGE FOUND THAT
EXPOSES BARE METAL
ON THE APU FUEL LINE
SHROUD DURING AC-
TION 1 INSPECTION.
Repair damage to the exist-
ing APU fuel line shroud.
PART 2: APU FUEL LINE
SHROUD REPAIR AND
REPLACEMENT
-CONDITION 2 (OPTION
2):
Replace existing APU fuel
line shroud with new or re-
paired shroud.
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
19 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 20

Table 1: Inspection of the APU Fuel Line Shroud and the Pressure Switch Wire Clamp
Refer to the listed proce-
dures in SB 737-38A1072
Original Issue or later
approved revisions as an
accepted procedure
Method of ComplianceActionCondition
PART 2: APU FUEL LINE
SHROUD REPAIR AND
REPLACEMENT
-Replace existing APU fuel
line shroud with new or re-
paired shroud.
CONDITION 3: ANY DENT
DAMAGE FOUND THAT
DECREASES THE OUT-
SIDE DIAMETER OF THE
SHROUD MORE THAN
0.031 INCH DURING AC-
TION 1 INSPECTION.
--No further action required
on the APU fuel line
shroud.
CONDITION 4: NO DAM-
AGE IS FOUND ON THE
APU FUEL LINE SHROUD
DURING ACTION 1 IN-
SPECTION.
-FIGURE 2CONDITION 5 (ACTION
1): Re-install the fastener
of the pressure switch wire
clamp with the bolt head
on top and the nut on the
bottom.
CONDITION 5: FASTEN-
ER OF THE PRESSURE
SWITCH WIRE CLAMP IS
NOT FOUND TO BE IN-
STALLED WITH THE
BOLT HEAD ON TOP
AND THE NUT ON THE
BOTTOM DURING AC-
TION 2 INSPECTION.
-FIGURE 2CONDITION 5 (ACTION
2): Re-install the pressure
switch wire clamp assem-
bly to make sure there is
1.5 inches minimum of
horizontal separation be-
tween the fastener of the
pressure switch wire clamp
and the APU fuel line
shroud.
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
20 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 21

Table 1: Inspection of the APU Fuel Line Shroud and the Pressure Switch Wire Clamp
Refer to the listed proce-
dures in SB 737-38A1072
Original Issue or later
approved revisions as an
accepted procedure
Method of ComplianceActionCondition
-FIGURE 2Re-install the pressure
switch wire clamp assem-
bly to make sure there is
1.5 inches minimum of
horizontal separation be-
tween the fastener of the
pressure switch wire clamp
and the APU fuel line
shroud.
CONDITION 6: FASTEN-
ER OF THE PRESSURE
SWITCH WIRE CLAMP IS
FOUND TO BE IN-
STALLED WITH THE
BOLT HEAD ON TOP
AND THE NUT ON THE
BOTTOM, BUT THE
HORIZONTAL SEPARA-
TION BETWEEN THE
FASTENER OF THE
PRESSURE SWITCH
WIRE CLAMP AND THE
APU FUEL LINE SHROUD
IS NOT A MINIMUM OF
1.5 INCHES DURING AC-
TION 2 INSPECTION.
--No further action required
on the fastener of the
pressure switch wire
clamp.
CONDITION 7: FASTEN-
ER OF THE PRESSURE
SWITCH WIRE CLAMP IS
FOUND TO BE IN-
STALLED WITH THE
BOLT HEAD ON TOP
AND THE NUT ON THE
BOTTOM AND THE HOR-
IZONTAL SEPARATION
IS A MINIMUM OF 1.5
INCHES DURING ACTION
2 INSPECTION.
PART 4: CLOSE ACCESS--
(a) Damage is defined as: any crack or hole, any damage that exposes bare metal on the APU fuel line shroud,
and any dent damage found that decreases the outside diameter of the shroud by more than 0.031 inch.
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
21 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 22 (OCR)

REQUIREMENTS BULLETIN 737-38A1072
ALERT  ALERT
SIA
925
STA
945
STA
965
2982478
FIGURE 1: APU FUEL LINE SHROUD - INSPECTION
(SHEET 1 OF 3)
Original Issue: February 25, 2022
737-38A1072 RB
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.  22 of 28

### Page 23 (OCR)

REQUIREMENTS BULLETIN 737-38A1072
ALERT  ALERT
STA
947.5
- PRESSURE SWITCH
WIRE CLAMP
BL
3 INCHES
RADIUS
APU FUEL
LINE SHROUD
BL
PRESSURE SWITCH.
RBI
4.0
A INSPECTION AREA  -WD  PRESSURE  SWITCH WIRE  CLAMP BOLT
CLAMP  A-A  2982498
FIGURE 1: APU FUEL LINE SHROUD - INSPECTION
(SHEET 2 OF 3)
Original Issue: February 25, 2022
Export Controlled ECCN: 9E991  737-38A1072 RB
Copyright © Unpublished Work - See page 1 for details.  23 of 28

### Page 24

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 each airplane.
More DataQtyIdentificationNameTaskStep
(a)1346A2201-3,
346A2201-11,
346A2201-17,
346A2201-19,
346A2201-20,
346A2201-26,
OR 346A2201-27
APU Fuel Line
Shroud
Inspect1
(a) Do a general visual inspection of the APU fuel line shroud in the area within 3 inches of the fastener of
the pressure switch wire clamp for any damage.
FIGURE 1: APU FUEL LINE SHROUD - INSPECTION
(SHEET 3 OF 3)
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
24 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 25 (OCR)

REQUIREMENTS BULLETIN 737-38A1072
ALERT  ALERT
925  LBI
STA
945
STA  RBL
965  14
2982499
FIGURE 2: PRESSURE SWITCH WIRE CLAMP - INSPECTION
(SHEET 1 OF 4)
Original Issue: February 25, 2022
Export Controlled ECCN: 9E991  737-38A1072 RB
Copyright © Unpublished Work - See page 1 for details.  25 of 28

### Page 26 (OCR)

REQUIREMENTS BULLETIN 737-38A1072
ALERT  ALERT
STA
947.5
BL
PRESSURE SWITCH
WIRE CLAMP
NUT  BOLT
CLAMP
CLAMP
BOLT  NUT
INCORRECT INSTALLATION  CORRECT INSTALLATION
A-A  A-A
2982500
FIGURE 2: PRESSURE SWITCH WIRE CLAMP - INSPECTION
(SHEET 2 OF 4)
Original Issue: February 25, 2022
737-38A1072 RB
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.  26 of 28

### Page 27

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 each airplane.
More DataQtyIdentificationNameTaskStep
(a)(b)1BACS12GU3K11Bolt, ClampInspect1
(c)(d)(e)1BACC10DK15Clamp, Pressure
Switch Wire
Inspect2
(a) Do a detailed inspection of the pressure switch wire clamp, to determine if the clamp bolt is installed with
the bolt head on top, and the nut on the bottom.
(b) If the clamp bolt is not installed correctly, re-install the clamp bolt, to make sure the clamp bolt is installed
with the bolt head on top, and the nut on the bottom.
(c) Do a detailed inspection of the pressure switch wire clamp, to determine if there is a minimum of 1.5
inches horizontal separation between the clamp bolt and the APU fuel line shroud.
FIGURE 2: PRESSURE SWITCH WIRE CLAMP - INSPECTION
(SHEET 3 OF 4)
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
27 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

### Page 28

More DataQtyIdentificationNameTaskStep
(d) If the horizontal separation between the pressure switch wire clamp assembly and the APU fuel line shroud
is less than 1.5 inches, re-install the pressure switch wire clamp assembly to make sure the horizontal
separation is at a minimum of 1.5 inches.
(e) Adjust clamp position and/or orientation in a manner that does not add tension in the pressure switch wire,
and allows proper clearance between the fastener and APU shroud.
FIGURE 2: PRESSURE SWITCH WIRE CLAMP - INSPECTION
(SHEET 4 OF 4)
Export Controlled ECCN: 9E991
Copyright © Unpublished Work - See page 1 for details.
Original Issue: February 25, 2022
737-38A1072 RB
28 of 28
REQUIREMENTS BULLETIN 737-38A1072
ALERTALERT

---
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.