# Boeing Alert Service Bulletin 737-32A1599: No revision named

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2025-5025, the docket of AD 2025-24-02. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Service Bulletin 737-32A1599](https://openairdocs.org/service-documents/boeing/737-32a1599.md)
- Title as filed: 737-32A1599-00-RB
- Pages: 44
- PDF: https://openairdocs.org/files/sha256/86/31/86318d58a2f79afda2f07cdc4905bff58f843a1ad324af69468f2156253ed797
- Page: https://openairdocs.org/service-documents/boeing/737-32a1599/file/86318d58a2f7

## Text

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### Page 1

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-32A1599 RB
Original Issue: October 14, 2025
ATA System: 3241
SUBJECT: LANDING GEAR - Hydraulic Brake System - Main Landing Gear Brake Hydraulic Hoses
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 © 2025 The Boeing Company
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 14, 2025
737-32A1599 RB
1 of 44
3.0

### Page 2

Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
2 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT
BLANK PAGE

### Page 3

Table of Contents
1. EFFECTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
A. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
B. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2. CONCURRENT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3. COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4. APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
B. Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
FIGURE 1: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI) [Group 1, Configuration 3-5] . . . . . . . . . . . . . . . . . . . . . . . 21
FIGURE 2: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI) [Group 1, Configuration 3-5] . . . . . . . . . . . . . . . . . . . . . . . 26
FIGURE 3: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION [Group 1, Configuration 3-5] . . . . . . . . . . . . . . . . . . . . . . . . . 31
FIGURE 4: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION [Group 1, Configuration 3-5] . . . . . . . . . . . . . . . . . . . . . . . . . 36
APPENDIX A: BRAKE REPLACEMENT SERVICE BULLETINS . . . . . . . . . . . . . . . . . . . . . . 41
APPENDIX B: ANTISKID VALVE OPERATIONAL TEST [Group 1, Configuration 3-5] . . . . . . . . . . . 43
APPENDIX C: TRANSDUCER OPERATIONAL TEST [Group 1, Configuration 3-5] . . . . . . . . . . . . 44
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
3 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 4

Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
4 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT
BLANK PAGE

### Page 5

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-32A1599 RB
Original Issue: October 14, 2025
ATA System: 3241
SUBJECT: LANDING GEAR - Hydraulic Brake System - Main Landing Gear Brake Hydraulic Hoses
Inspection
THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN
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 737-700, 737-800, 737-900, 737-900ER Airplane(s), line number(s)
1-20, 22-29, 31-48, 50-91, 93-99, 101-111, 113-115, 117-119, 121-136, 138-148, 150-190, 192,
194-208, 210-226, 228-242, 244-254, 256, 258-267, 269, 271-281, 283-289, 291-302, 304-309,
311-328, 331-332, 334, 336-367, 369-374, 376-381, 383-406, 408-446, 448-495, 497-509, 511-525,
527-542, 544-545, 547-562, 564-567, 569-613, 615-650, 652-741, 743-815, 817-886, 888-924,
926-931, 933-937, 939-977, 979-1068, 1070-1114, 1116-1130, 1132-1149, 1151, 1153-1163,
1165-1173, 1175-1244, 1246-1275, 1277-1293, 1295-1304, 1306-1377, 1379-1399, 1401-1414,
1416-1436, 1438-1454, 1456-1507, 1509-1547, 1549-1603, 1605-1613, 1615-1758, 1760-1796,
1798-1809, 1811-1815, 1817-1838, 1840-1848, 1850-1861, 1863-1883, 1886-1911, 1913-1930,
1932-1933, 1935-1955, 1957-1978, 1980-1990, 1992-2003, 2005-2015, 2017-2021, 2023-2031,
2033-2044, 2046-2079, 2081-2404, 2406-2530, 2532-2598, 2600-2666, 2668-2721, 2723-2813,
2815-2821, 2823-2930, 2932-2941, 2943-2951, 2953-3023, 3025-3052, 3054-3057, 3059-3068,
3070, 3072-3080, 3082-3099, 3101-3109, 3111-3122, 3124-3128, 3130-3165, 3167-3170,
3172-3176, 3178-3188, 3190-3323, 3325-3345, 3347-3412, 3414-3425, 3427-3521, 3523-3611,
3613-3675, 3677-3701, 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, 4979-4999, 5001-5019, 5021-5057,
5059-5097, 5099-5137, 5139-5157, 5159-5177, 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, 5853-5861, 5863-5879,
5881-5901, 5904-5935, 5937-5947, 5949-5962, 5964-5981, 5983-5991, 5994-6019, 6021-6033,
6035-6047, 6049-6059, 6061-6073, 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,
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
5 of 44

### Page 6

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, 6790-6791, 6793, 6795, 6797, 6799-6802, 6804,
6806, 6808-6809, 6811, 6813, 6815, 6817-6818, 6820, 6822-6824, 6826-6827, 6829, 6831-6833,
6835-6836, 6838, 6840, 6842, 6844-6845, 6847, 6849, 6851, 6853-6854, 6856-6858, 6860,
6862-6863, 6865, 6867, 6869-6871, 6873-6874, 6878-6880, 6882-6883, 6885, 6887-6889,
6891-6892, 6894, 6896, 6898, 6900-6903, 6905, 6907, 6910, 6912-6914, 6916, 6918-6919, 6921,
6923-6925, 6927-6928, 6930, 6932-6934, 6936-6937, 6939, 6943, 6945-6948, 6950, 6952,
6954-6955, 6957-6959, 6961-6962, 6964, 6966-6967, 6969, 6971-6972, 6977, 6979, 6981-6982,
6984, 6986-6987, 6989, 6992, 6994, 6996-6997, 6999, 7001-7002, 7007, 7009, 7011-7012, 7014,
7016-7017, 7019, 7021-7022, 7024, 7026, 7029, 7031-7032, 7034, 7036-7037, 7039, 7041,
7046-7047, 7049, 7051-7052, 7054, 7056-7057, 7059, 7061, 7063, 7066-7067, 7069, 7071-7072,
7076, 7078, 7081-7082, 7084, 7086-7087, 7089, 7091-7092, 7094, 7097, 7099, 7101-7102, 7104,
7106-7107, 7109, 7112, 7116-7117, 7119, 7121-7122, 7124, 7126-7127, 7129, 7131, 7134,
7136-7137, 7139, 7141-7142, 7146, 7149, 7151-7152, 7154, 7156-7157, 7159, 7161-7162, 7164,
7167, 7169, 7171-7172, 7174, 7176-7177, 7179, 7182, 7187, 7189, 7191, 7194, 7197, 7199, 7202,
7204, 7206, 7209, 7212, 7214, 7217, 7221, 7224, 7227, 7229, 7232, 7234-7235, 7239, 7242,
7244, 7247, 7249, 7251, 7257, 7259, 7262, 7264, 7266, 7269, 7272, 7274, 7277, 7279-7280,
7284, 7287, 7292, 7294, 7297, 7299, 7302, 7304, 7307, 7309, 7312, 7314, 7317, 7319, 7322,
7327, 7329, 7332, 7334, 7337, 7339, 7342, 7344, 7347, 7349, 7352, 7354, 7357, 7362, 7364,
7367, 7369, 7372, 7374, 7377, 7379, 7382, 7387, 7397, 7402, 7407, 7412, 7417, 7422, 7432,
7437, 7442, 7447, 7452, 7457, 7467, 7472, 7482, 7487, 7492, 7502, 7507, 7512, 7517, 7522,
7527, 7537, 7547, 7552, 7557, 7562, 7572, 7577, 7582, 7592, 7597, 8592, 9103, 9274, 9430-99999
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.
NOTE: Airplanes listed in the effectivity of this bulletin can be classified into one or more of the
five configurations specified in the group-configuration description table. Operators must
determine airplane configuration(s) based on the definition given and accomplish all
applicable actions.
NOTE: The Variable Number table below includes affected airplanes available as of the issue
date of this bulletin. Affected airplane Variable Numbers added to MyBoeingFleet.com
after the issue date of this bulletin will be shown using the Maintenance Performance
Toolbox EFFECTIVITY search function result.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
6 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 7

DESCRIPTIONCONFIGURATIONGROUP
737-700, 737-800, 737-900, 737-900ER Airplanes.-1
Airplanes that have not accomplished any service bulletin listed in
Appendix A as of the Original Issue date of Requirements Bulletin
737-32A1599 RB.
1
Airplanes that, as of the Original Issue date of Requirements Bulletin
737-32A1599 RB, have accumulated 1500 Flight Cycles (FC) or more
since the most recent accomplishment of any service bulletin listed
in Appendix A.
2
Airplanes that, as of the Original Issue date of Requirements Bulletin
737-32A1599 RB, have accumulated less than 1500 FC since the
most recent accomplishment of any service bulletin listed in Appendix
A.
3
Airplanes that accomplish any service bulletin listed in Appendix A
on or after the Original Issue date of Requirements Bulletin
737-32A1599 RB.
4
Airplanes for which it cannot be determined whether any service
bulletin listed in Appendix A was accomplished, or for which the
accumulated flight cycles cannot be determined since the
accomplishment of any service bulletin listed in Appendix A.
5
Airplane Models:
737-700, 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
GroupVariable Number
1YA336 - YA345
1YA351
1YA356 - YA357
1YA366 - YA367
1YA371 - YA377
1YA501 - YA536
1YA541 - YA552
1YA571 - YA578
1YA601 - YA615
1YA621 - YA622
1YA626 - YA631
GroupVariable Number
1YA635 - YA636
1YA641 - YA642
1YA645 - YA650
1YA656 - YA659
1YA666 - YA667
1YA671 - YA672
1YA681 - YA691
1YA701 - YA710
1YA721 - YA722
1YA731 - YA734
1YA751 - YA756
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
7 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 8

GroupVariable Number
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
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
GroupVariable Number
1YB911
1YB961 - YB975
1YB981
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
GroupVariable Number
1YC571 - YC583
1YC587 - YC589
1YC591 - YC593
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
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
8 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 9

GroupVariable Number
1YD401 - YD410
1YD412 - YD415
1YD417 - YD424
1YD481 - YD485
1YD491 - YD499
1YD501 - YD512
1YD531 - YD535
1YD541 - YD547
1YD561 - YD564
1YD571 - YD572
1YD591 - YD595
1YD601 - YD612
1YD651 - YD655
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
1YF451 - YF460
1YF501 - YF599
1YF601 - YF685
1YF691 - YF695
1YF702
GroupVariable Number
1YF705 - 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 - YG149
1YG151 - YG152
1YG224
1YG251 - YG252
1YH001 - YH012
1YH031 - YH055
1YH071 - YH080
1YH101 - YH132
1YH201 - YH202
1YH206 - YH207
1YH301 - YH307
1YH321 - YH322
1YH501 - YH542
1YH551 - YH594
1YH601 - YH606
1YH611 - YH620
1YH631 - YH632
1YH636 - YH637
1YH641
GroupVariable Number
1YH681 - YH686
1YH701 - YH755
1YH801 - YH899
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
1YK101 - YK104
1YK111 - YK112
1YK121 - YK122
1YK131 - YK133
1YK136 - YK139
1YK141 - YK142
1YK146 - YK148
1YK151 - YK154
1YK161 - YK167
1YK171
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
9 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 10

GroupVariable Number
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
1YK601 - YK602
1YK606 - YK607
1YK611 - YK616
1YK621 - YK634
1YK641 - YK644
1YK651 - YK665
1YK671 - YK672
1YK676 - YK677
1YK681 - YK686
1YK691
GroupVariable Number
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
1YL201 - YL237
1YL241 - YL242
1YL271 - YL272
1YL281 - YL284
1YL301 - YL303
1YL311 - YL314
1YL316 - YL321
1YL351 - YL353
1YL371 - YL374
1YL401
GroupVariable Number
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
1YL769 - YL780
1YL796 - YL797
1YL801 - YL815
1YL901 - YL910
1YL921 - YL940
1YL951 - YL968
1YM101 - YM103
1YM201 - YM244
1YM251 - YM299
1YM301 - YM399
1YM401 - YM415
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### Page 11

GroupVariable Number
1YM471
1YM481 - YM484
1YM501 - YM515
1YM521 - YM522
1YM541
1YM551 - YM553
1YM571 - YM572
1YM581 - YM582
1YM591 - YM599
1YM631 - YM634
1YM641 - YM652
1YM671 - YM674
1YM691 - YM699
1YM702 - YM709
1YM761 - YM765
1YM771 - YM779
1YN001 - YN016
1YN021 - YN024
1YN061
1YN071 - YN082
1YN091 - YN092
1YN101 - YN112
1YN121
1YN126
1YN201 - YN202
1YN211 - YN219
1YN231 - YN236
1YN261
1YN501
1YN531 - YN534
1YN551 - YN566
1YN581 - YN585
1YN591 - YN593
GroupVariable Number
1YN601 - YN606
1YN651 - YN653
1YN661 - YN663
1YN666 - YN667
1YN671 - YN674
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
1YQ401 - YQ403
1YQ451 - YQ454
1YQ456
1YQ461
1YQ471
1YQ501 - YQ520
1YQ601 - YQ606
1YQ610 - YQ614
1YR001 - YR098
1YR101 - YR105
GroupVariable Number
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
1YR501 - YR506
1YR511 - YR520
1YR526 - YR544
1YR546 - YR551
1YR556 - YR562
1YR571 - YR582
1YR591 - YR592
1YR601 - YR605
1YR616 - YR658
1YR661 - YR663
1YR671 - YR673
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### Page 12

GroupVariable Number
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
1YS231 - YS236
1YS271 - YS288
1YS295 - YS296
1YS301 - YS348
1YS351 - YS378
1YS381 - YS386
1YS393 - YS395
1YS401
1YS451
1YS456 - YS457
1YS462 - YS465
GroupVariable Number
1YS467
1YS501 - YS502
1YS506
1YS511 - YS518
1YS531
1YS536 - YS538
1YS541 - YS542
1YS546
1YS551 - YS556
1YS561 - YS578
1YS581 - YS595
1YS601 - YS690
1YS701 - YS716
1YS721 - YS762
1YS771 - YS780
1YS806 - YS810
1YS816 - YS818
1YS823 - YS825
1YS851 - YS863
1YS876
1YS881 - YS884
1YS891 - YS894
1YS896 - YS897
1YS901 - YS909
1YS911 - YS957
1YS961 - YS974
1YS976 - YS977
1YS981 - YS987
1YS991 - YS998
1YT001 - YT004
1YT006
1YT026 - YT027
1YT031 - YT032
GroupVariable Number
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
1YT556 - YT563
1YT565
1YT571 - YT578
1YT601 - YT606
1YT701 - YT708
1YT723 - YT726
1YT761 - YT781
1YT791 - YT794
1YT796 - YT797
1YT801 - YT804
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### Page 13

GroupVariable Number
1YT811 - YT813
1YT826 - YT827
1YT831 - YT832
1YT841 - YT852
1YT856 - YT863
1YT885 - YT887
1YT891 - YT895
1YT901 - YT998
1YU001 - YU060
1YU201 - YU218
1YU301 - YU329
1YU901 - YU931
1YV001 - YV012
1YV021 - YV023
1YV030 - YV034
1YV037 - YV042
1YV045 - YV047
1YV051 - YV059
1YV081
1YV083 - YV084
1YV097 - YV099
1YV101 - YV154
1YV201 - YV203
1YV251 - YV252
1YV256 - YV257
1YV301 - YV312
1YV351 - YV368
1YV381 - YV388
1YV391 - YV394
1YV401
1YV411 - YV413
1YV431 - YV433
GroupVariable Number
1YV441 - YV454
1YV461 - YV464
1YV467 - YV470
1YV501 - YV512
1YV521
1YV571 - YV586
1YV596
1YV601 - YV605
1YV651 - YV674
1YV676
1YV695 - YV696
1YV701 - YV702
1YV711
1YV722 - YV731
1YV741 - YV794
1YV801 - YV820
1YV831 - YV848
1YV881 - YV883
1YV901 - YV915
1YV923 - YV926
1YV971 - YV983
1YW001
1YW011 - YW099
1YW101 - YW164
1YW201 - YW212
1YW226 - YW240
1YW245 - YW261
1YW263
1YW267 - YW281
1YW283 - YW285
1YW292 - YW299
1YW351
GroupVariable Number
1YW356 - YW358
1YW361 - YW366
1YW371 - YW399
1YW401 - YW430
1YW441 - YW445
1YW451 - YW452
1YW471 - YW472
1YW491 - YW498
1YW531 - YW536
1YW541 - YW545
1YW551 - YW580
1YW585 - YW591
1YW595 - YW596
1YW601
1YW610 - YW613
1YW616 - YW623
1YW666
1YW696 - YW699
1YW701 - YW715
1YW726 - YW731
1YW766 - YW775
1YW801 - YW803
1YW811 - YW813
1YW821
1YW831
1YW881
1YW891 - YW893
1YW906 - YW910
1YW916 - YW918
1YW921 - YW925
1YW971 - YW976
--
B. Spares Affected
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### Page 14

None.
2. CONCURRENT REQUIREMENTS
None.
3. COMPLIANCE
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to
Requirements Bulletin 737-32A1599 RB. The Airworthiness Directive will make the compliance tasks and
times given in Requirements Bulletin 737-32A1599 RB mandatory.
Accomplish the required action(s), based on the applicable condition(s) in Table 1 or Table 2, 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.
The Conditions, Actions, and Compliance times shown in Table 1 and Table 2, apply to the left and right
side locations independently.
Group 1, Configuration 1:
No further action is required, except if any service bulletin listed in APPENDIX A is done on or after the
Original Issue date of Requirements Bulletin 737-32A1599 RB, then that airplane is Group 1, Configuration
4 and the corresponding actions must be done.
Group 1, Configuration 2:
No further action is required.
Group 1, Configuration 3, 5:
Table 1: Main Landing Gear (MLG) - Brake Hydraulic Hoses Inspection and Correction
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Within 30 days after the Original
Issue date of Requirements Bul-
letin 737-32A1599 RB.
Do a General Visual Inspection
(GVI) of the left and right Main
Landing Gear (MLG) brake hy-
draulic hoses for any crossed
installation.
All airplanes.
-Before further flight.CONDITION 1 (ACTION 1):
Disassemble affected brake hy-
draulic hoses and then install
the brake hydraulic hoses to the
correct flow limiter or union.
CONDITION 1: ANY
CROSSED BRAKE
HYDRAULIC HOSES
FOUND.
-Before further flight.CONDITION 1 (ACTION 2): Do
Antiskid Valve Operational Test.
-Before further flight.CONDITION 1 (ACTION 3): Do
Transducer Operational Test.
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### Page 15

Group 1, Configuration 3, 5:
Table 1: Main Landing Gear (MLG) - Brake Hydraulic Hoses Inspection and Correction
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Before further flight.CONDITION 2 (ACTION 1): Do
Antiskid Valve Operational Test.
CONDITION 2: NO
CROSSED BRAKE
HYDRAULIC HOSES
FOUND. -Before further flight.CONDITION 2 (ACTION 2): DoTransducer Operational Test.
Group 1, Configuration 4:
Table 2: Main Landing Gear (MLG) - Brake Hydraulic Hoses Inspection and Correction
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Before further flight after the ac-
complishment of any service
bulletin listed in APPENDIX A, or
within 30 days after the Original
Issue date of Requirements Bul-
letin 737-32A1599 RB, whichev-
er occurs later.
Do a General Visual Inspection
(GVI) of the left and right Main
Landing Gear (MLG) brake hy-
draulic hoses for any crossed
installation.
All airplanes.
-Before further flight.CONDITION 3 (ACTION 1):
Disassemble affected brake hy-
draulic hoses and then install
the brake hydraulic hoses to the
correct flow limiter or union.
CONDITION 3: ANY
CROSSED BRAKE
HYDRAULIC HOSES
FOUND.
-Before further flight.CONDITION 3 (ACTION 2): Do
Antiskid Valve Operational Test.
-Before further flight.CONDITION 3 (ACTION 3): Do
Transducer Operational Test.
-Before further flight.CONDITION 4 (ACTION 1): Do
Antiskid Valve Operational Test.
CONDITION 4: NO
CROSSED BRAKE
HYDRAULIC HOSES
FOUND. -Before further flight.CONDITION 4 (ACTION 2): DoTransducer Operational Test.
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) approved for all EASA 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.
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### Page 16

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REQUIREMENTS BULLETIN 737-32A1599
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. In the RB, the "Refer to the listed procedures..." column of the
table(s) in the Work Instructions is for reference only. The procedures in that column
are not required by the AD and are for guidance only. 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 Structural Repair Manual, Chapter
51.
— Values for airframe maintenance tasks are included in Chapter 20 of
737-600/700/800/900 Aircraft Maintenance Manual (AMM).
— Non-standard torque values for maintenance tasks are included in the
applicable installation step.
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### 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. Where the work instructions include installation of a kept part, a new or serviceable
part with the same part number can be installed as an alternative to the kept part.
7. Do not use any kept bolts, screws, nuts, or washers with damage that impairs fit,
form, or function. Refer to SOPM 20-50-01 GENERAL.
8. 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.
9. Use the approved fastener, process and material substitutions in accordance with
SRM Chapter 51.
10. A General Visual Inspection (GVI) 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.
11. 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.
12. Use of colors in Figures is based on guidance from the ATA e-Business Program
(ATA) iSpec 2200.
13. Refer to APPENDIX A for the list of the brake replacement service bulletins.
B. WORK INSTRUCTIONS
Actions Required for Compliance
1. Requirements
Group 1, Configuration 1:
No further action is required, except if any service bulletin listed in APPENDIX A is done on or
after the Original Issue date of Requirements Bulletin 737-32A1599 RB, then that airplane is Group
1, Configuration 4 and the corresponding actions must be done.
Group 1, Configuration 2:
No further action is required.
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REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 19

Group 1, Configuration 3, 5:
Table 1: Main Landing Gear (MLG) - Brake Hydraulic Hoses Inspection and Correction
Refer to the listed pro-
cedures in SB 737-
32A1599 Original Issue
or later approved revi-
sions as an accepted
procedure
Method of ComplianceActionCondition
Do PART 1: PREPARA-
TION FOR GENERAL
VISUAL INSPECTION
(GVI).
-Do a General Visual Inspec-
tion (GVI) of the left and right
Main Landing Gear (MLG)
brake hydraulic hoses for any
crossed installation.
All Airplanes
-FIGURE 1
FIGURE 2
Do PART 2: PREPARA-
TION FOR BRAKE HY-
DRAULIC HOSES IN-
STALLATION.
-CONDITION 1 (ACTION 1):
Disassemble affected brake
hydraulic hoses and then in-
stall the brake hydraulic hoses
to the correct flow limiter or
union.
CONDITION 1: ANY
CROSSED BRAKE HY-
DRAULIC HOSES
FOUND.
-FIGURE 3
FIGURE 4
Do PART 3: HY-
DRAULIC HOSE IN-
STALLATION TESTS.
-
-APPENDIX BCONDITION 1 (ACTION 2):
Do Antiskid Valve Operational
Test.
-APPENDIX CCONDITION 1 (ACTION 3):
Do Transducer Operational
Test. Do PART 4: RESTORA-TION.-
-APPENDIX BCONDITION 2 (ACTION 1):
Do Antiskid Valve Operational
Test.
CONDITION 2: NO
CROSSED BRAKE HY-
DRAULIC HOSES
FOUND. -APPENDIX CCONDITION 2 (ACTION 2):
Do Transducer Operational
Test. Do PART 4: RESTORA-TION.-
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### Page 20

Group 1, Configuration 4:
Table 2: Main Landing Gear (MLG) - Brake Hydraulic Hoses Inspection and Correction
Refer to the listed pro-
cedures in SB 737-
32A1599 Original Issue
or later approved revi-
sions as an accepted
procedure
Method of ComplianceActionCondition
Do PART 1: PREPARA-
TION FOR GENERAL
VISUAL INSPECTION
(GVI).
-Do a General Visual Inspec-
tion (GVI) of the left and right
Main Landing Gear (MLG)
brake hydraulic hoses for any
crossed installation.
All Airplanes
-FIGURE 1
FIGURE 2
Do PART 2: PREPARA-
TION FOR BRAKE HY-
DRAULIC HOSES IN-
STALLATION.
-CONDITION 3 (ACTION 1):
Disassemble affected brake
hydraulic hoses and then in-
stall the brake hydraulic hoses
to the correct flow limiter or
union.
CONDITION 3: ANY
CROSSED BRAKE HY-
DRAULIC HOSES
FOUND.
-FIGURE 3
FIGURE 4
Do PART 3: HY-
DRAULIC HOSE IN-
STALLATION TESTS.
-
-APPENDIX BCONDITION 3 (ACTION 2):
Do Antiskid Valve Operational
Test.
-APPENDIX CCONDITION 3 (ACTION 3):
Do Transducer Operational
Test. Do PART 4: RESTORA-TION.-
-APPENDIX BCONDITION 4 (ACTION 1):
Do Antiskid Valve Operational
Test.
CONDITION 4: NO
CROSSED BRAKE HY-
DRAULIC HOSES
FOUND. -APPENDIX CCONDITION 4 (ACTION 2):
Do Transducer Operational
Test. Do PART 4: RESTORA-TION.-
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### Page 21 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
This Figure applies only to: Group 1, Configuration 3-5.
THROUGH D
FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
SHIMMY DAMPER
HOSE
INBD
LEFT MAIN LANDING GEAR
INCORRECT (CROSSED) BRAKE HYDRAULIC HOSE INSTALLATION
(VIEW IN THE UP DIRECTION)
3093625
FIGURE 1: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 1 OF 5)
Original Issue: October 14, 2025
Export Controlled ECCN: 9E991  737-32A1599 RB
See page 1 for details  21 of 44

### Page 22 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FORWARD FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
AFT FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
SHIMMY
— DAMPER HOSE
HOSE GUIDE
ASSEMBLY
INBD
UNION
CONNECTIONS
LEFT MAIN LANDING GEAR
INCORRECT (CROSSED) BRAKE HYDRAULIC HOSE INSTALLATION
(VIEW IN THE INBOARD DIRECTION)
3099641
FIGURE 1: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 2 OF 5)
Original Issue: October 14, 2025
737-32A1599 RB
Export Controlled ECCN: 9E991
See page 1 for details  22 of 44

### Page 23 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
SHIMMY DAMPER  HOSE
INBD
LEFT MAIN LANDING GEAR
CORRECT BRAKE HYDRAULIC HOSE INSTALLATION
(VIEW IN THE UP DIRECTION)
3093629
FIGURE 1: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 3 OF 5)
Original Issue: October 14, 2025
Export Controlled ECCN: 9E991  737-32A1599 RB
See page 1 for details  23 of 44

### Page 24 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FORWARD FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
AFT FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
SHIMMY
DAMPER HOSE
HOSE GUIDE
ASSEMBLY
INBD
UNION
CONNECTIONS
LEFT MAIN LANDING GEAR
CORRECT BRAKE HEDRAULIC HOSE INSTALLATION  (VIEW IN THE INBOARD DIRECTION)
3099642
FIGURE 1: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 4 OF 5)
Original Issue: October 14, 2025
737-32A1599 RB
Export Controlled ECCN: 9E991
See page 1 for details  24 of 44

### Page 25

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 this figure.
More DataQtyIdentificationNameTaskStep
(a)2-BRAKE HYDRAULIC
HOSE
Inspect1
(a) Do a General Visual Inspection (GVI) of the left Main Landing Gear (MLG) brake hydraulic hoses for any
crossed installation between the flow limiter or union connections located above the MLG and the union
connections on the MLG.
FIGURE 1: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 5 OF 5)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
25 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 26 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
This Figure applies only to: Group 1, Configuration 3-5.
THROUGH D
FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)  SHIMMY DAMPER
HOSE
INBD
RIGHT MAIN LANDING GEAR
INCORRECT (CROSSED) BRAKE HYDRAULIC HOSE INSTALLATION
(VIEW IN THE UP DIRECTION)
3093698
FIGURE 2: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 1 OF 5)
Original Issue: October 14, 2025
737-32A1599 RB
Export Controlled ECCN: 9E991
See page 1 for details  26 of 44

### Page 27 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FORWARD FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
AFT FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
SHIMMY  HOSE GUIDE
DAMPER HOSE  ASSEMBLY
INBD
UNION
CONNECTIONS
RIGHT MAIN LANDING GEAR
INCORRECT (CROSSED) BRAKE HYDRAULIC HOSE INSTALLATION
(VIEW IN THE INBOARD DIRECTION)
3099648
FIGURE 2: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 2 OF 5)
Original Issue: October 14, 2025
Export Controlled ECCN: 9E991  737-32A1599 RB
See page 1 for details  27 of 44

### Page 28 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FLOW LIMITER OR UNION  SHIMMY DAMPER
(FLOW LIMITER SHOWN)  HOSE
FWD
RIGHT MAIN LANDING GEAR
CORRECT BRAKE HYDRAULIC HOSE INSTALLATION
(VIEW IN THE UP DIRECTION)
3093700
FIGURE 2: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 3 OF 5)
Original Issue: October 14, 2025
Export Controlled ECCN: 9E991  737-32A1599 RB
See page 1 for details  28 of 44

### Page 29 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FORWARD FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
AFT FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
SHIMMY  DAMPER HOSE  ASSEMBLY  HOSE GUIDE
INBD
UNION
CONNECTIONS
RIGHT MAIN LANDING GEAR
CORRECT BRAKE HYDRAULIC HOSE INSTALLATION
(VIEW IN THE INBOARD DIRECTION)
3099649
FIGURE 2: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 4 OF 5)
Original Issue: October 14, 2025
Export Controlled ECCN: 9E991  737-32A1599 RB
See page 1 for details  29 of 44

### Page 30

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 this figure.
More DataQtyIdentificationNameTaskStep
(a)2-BRAKE HYDRAULIC
HOSE
Inspect1
(a) Do a General Visual Inspection (GVI) of the right Main Landing Gear (MLG) brake hydraulic hoses for
any crossed installation between the flow limiter or union connections located above the MLG and the
union connections on the MLG.
FIGURE 2: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - GENERAL VISUAL
INSPECTION (GVI)
(SHEET 5 OF 5)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
30 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 31 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
This Figure applies only to: Group 1, Configuration 3-5.
......00
BEFORE (INCORRECT [CROSSED]
INSTALLATION)
AFTER (CORRECT INSTALLATION)
3093721
FIGURE 3: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 1 OF 5)
Original Issue: October 14, 2025
Export Controlled ECCN: 9E991  737-32A1599 RB
See page 1 for details  31 of 44

### Page 32 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FORWARD FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
AFT FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
SHIMMY
DAMPER HOSE
13
HOSE GUIDE
ASSEMBLY
INBD
UNION
CONNECTIONS
LEFT MAIN
LANDING GEAR
BEFORE (INCORRECT [CROSSED] INSTALLATION)
(VIEW IN THE INBOARD DIRECTION)
(SOME PARTS OF MAIN LANDING GEAR NOT SHOWN)
3093722
FIGURE 3: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 2 OF 5)
Original Issue: October 14, 2025
737-32A1599 RB
Export Controlled ECCN: 9E991
See page 1 for details  32 of 44

### Page 33 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FORWARD FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
AFT FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
15100
_ SHIMMY
— DAMPER HOSE
4673
HOSE GUIDE
ASSEMBLY
INBD
UNION
CONNECTIONS
LEFT MAIN
LANDING GEAR
AFTER (CORRECT INSTALLATION)
(VIEW IN THE INBOARD DIRECTION)
(SOME PARTS OF MAIN LANDING GEAR NOT SHOWN)
3093723
FIGURE 3: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 3 OF 5)
Original Issue: October 14, 2025
Export Controlled ECCN: 9E991  737-32A1599 RB
See page 1 for details  33 of 44

### Page 34

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 this figure.
More DataQtyIdentificationNameTaskStep
(a)1-IDENTIFICATION TAGInstall (Temporary)1
(b)1-IDENTIFICATION TAGInstall (Temporary)2
(c)2BACH8A04EN( )KBRAKE HYDRAULIC
HOSE
Disconnect3
(d)-BMS 3-11HYDRAULIC FLUIDApply4
(e)1BACH8A04EN( )KBRAKE HYDRAULIC
HOSE
Connect5
(f)1BACH8A04EN( )KBRAKE HYDRAULIC
HOSE
Connect6
(g)2-COUPLING NUTTorque7
(h)2-IDENTIFICATION TAGRemove8
(i)2BACH8A04EN( )KBRAKE HYDRAULIC
HOSE
Inspect9
(a) Install a temporary identification tag or equivalent to identify the brake hydraulic hose that is connected
to the forward flow limiter or union prior to disconnecting. The tag can be labeled 'Incorrectly Installed
Forward' or similar. Any method for installing the temporary identification tag or equivalent is acceptable
as long as the identification tag can easily be installed and removed without disrupting any components
of the airplane. Make sure no foreign object, debris, markings or residue are introduced to any airplane
components during the temporary identification tag installation.
(b) Install a temporary identification tag or equivalent to identify the brake hydraulic hose that is connected
to the aft flow limiter or union prior to disconnecting. The tag can be labeled 'Incorrectly Installed Aft' or
similar. Any method for installing the temporary identification tag or equivalent is acceptable as long as
the identification tag can easily be installed and removed without disrupting any components of the airplane.
Make sure no foreign object, debris, markings or residue are introduced to any airplane components
during the temporary identification tag installation.
(c) Disconnect each brake hydraulic hose from the flow limiter or union.
(d) Apply BMS 3-11 hydraulic fluid as lubricant to the entire circumference of the threads of the flow limiters
or unions and the brake hydraulic hose coupling nuts.
(e) Connect the brake hydraulic hose labelled 'Incorrectly Installed Forward' or similar to the aft flow limiter
or union.
(f) Connect the brake hydraulic hose labelled 'Incorrectly Installed Aft' or similar to the forward flow limiter
or union.
(g) Torque the coupling nut of each brake hydraulic hose that connects to each flow limiter or union to 270
pound-inches, plus or minus 13.5 pound-inches. Do not twist or kink the brake hydraulic hoses when the
nuts are tightened. Refer to SOPM 20-50-00 as an accepted procedure.
FIGURE 3: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 4 OF 5)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
34 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 35

More DataQtyIdentificationNameTaskStep
(h) Remove the temporary identification tag or equivalent from each brake hydraulic hose after it is connected
and discard the temporary identification tag. Make sure no foreign object, debris, markings or residue are
introduced to any airplane components during the temporary identification tag removal.
(i) Do a General Visual Inspection of the brake hydraulic hoses to make sure brake hydraulic hoses are no
longer crossed. If the brake hydraulic hoses are crossed, redo steps 1 through 9.
FIGURE 3: LEFT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 5 OF 5)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
35 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 36 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
This Figure applies only to: Group 1, Configuration 3-5.
BEFORE (INCORRECT [CROSSED]
INSTALLATION)
AFTER (CORRECT INSTALLATION)
3093724
FIGURE 4: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 1 OF 5)
Original Issue: October 14, 2025
737-32A1599 RB
Export Controlled ECCN: 9E991
See page 1 for details  36 of 44

### Page 37 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FORWARD FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
AFT FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
HOSE GUIDE
ASSEMBLY
SHIMMY
DAMPER HOSE
INBD
UNION
CONNECTIONS
RIGHT MAIN
LANDING GEAR
BEFORE (INCORRECT [CROSSED] INSTALLATION)
VIEW IN THE INBOARD DIRECTION
(SOME PARTS OF MAIN LANDING GEAR NOT SHOWN
3093734
FIGURE 4: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 2 OF 5)
Original Issue: October 14, 2025
Export Controlled ECCN: 9E991  737-32A1599 RB
See page 1 for details  37 of 44

### Page 38 (OCR)

REQUIREMENTS BULLETIN 737-32A1599
ALERT  ALERT
FORWARD FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
SHIMMY
DAMPER HOSE
AFT FLOW LIMITER OR UNION
(FLOW LIMITER SHOWN)
0780
HOSE GUIDE
4 5  ASSEMBLY
UNION
CONNECTIONS
RIGHT MAIN
LANDING GEAR
AFTER (CORRECT INSTALLATION)
(VIEW IN THE INBOARD DIRECTION)
(SOME PARTS OF MAIN LANDING GEAR NOT SHOWN)
3093735
FIGURE 4: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 3 OF 5)
Original Issue: October 14, 2025
Export Controlled ECCN: 9E991  737-32A1599 RB
See page 1 for details  38 of 44

### Page 39

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 this figure.
More DataQtyIdentificationNameTaskStep
(a)1-IDENTIFICATION TAGInstall (Temporary)1
(b)1-IDENTIFICATION TAGInstall (Temporary)2
(c)2BACH8A04EN( )KBRAKE HYDRAULIC
HOSE
Disconnect3
(d)-BMS 3-11HYDRAULIC FLUIDApply4
(e)1BACH8A04EN( )KBRAKE HYDRAULIC
HOSE
Connect5
(f)1BACH8A04EN( )KBRAKE HYDRAULIC
HOSE
Connect6
(g)2-COUPLING NUTTorque7
(h)2-IDENTIFICATION TAGRemove8
(i)2BACH8A04EN( )KBRAKE HYDRAULIC
HOSE
Inspect9
(a) Install a temporary identification tag or equivalent to identify the brake hydraulic hose that is connected
to the forward flow limiter or union prior to disconnecting. The tag can be labeled 'Incorrectly Installed
Forward' or similar. Any method for installing the temporary identification tag or equivalent is acceptable
as long as the identification tag can easily be installed and removed without disrupting any components
of the airplane. Make sure no foreign object, debris, markings or residue are introduced to any airplane
components during the temporary identification tag installation.
(b) Install a temporary identification tag or equivalent to identify the brake hydraulic hose that is connected
to the aft flow limiter or union prior to disconnecting. The tag can be labeled 'Incorrectly Installed Aft' or
similar. Any method for installing the temporary identification tag or equivalent is acceptable as long as
the identification tag can easily be installed and removed without disrupting any components of the airplane.
Make sure no foreign object, debris, markings or residue are introduced to any airplane components
during the temporary identification tag installation.
(c) Disconnect each brake hydraulic hose from the flow limiter or union.
(d) Apply BMS 3-11 hydraulic fluid as lubricant to the entire circumference of the threads of the flow limiters
or unions and the brake hydraulic hose coupling nuts.
(e) Connect the brake hydraulic hose labelled 'Incorrectly Installed Forward' or similar to the aft flow limiter
or union.
(f) Connect the brake hydraulic hose labelled 'Incorrectly Installed Aft' or similar to the forward flow limiter
or union.
(g) Torque the coupling nut of each brake hydraulic hose that connects to each flow limiter or union to 270
pound-inches, plus or minus 13.5 pound-inches. Do not twist or kink the brake hydraulic hoses when the
nuts are tightened. Refer to SOPM 20-50-00 as an accepted procedure.
FIGURE 4: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 4 OF 5)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
39 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 40

More DataQtyIdentificationNameTaskStep
(h) Remove the temporary identification tag or equivalent from each brake hydraulic hose after it is connected
and discard the temporary identification tag. Make sure no foreign object, debris, markings or residue are
introduced to any airplane components during the temporary identification tag removal.
(i) Do a General Visual Inspection of the brake hydraulic hoses to make sure brake hydraulic hoses are no
longer crossed. If the brake hydraulic hoses are crossed, redo steps 1 through 9.
FIGURE 4: RIGHT MAIN LANDING GEAR (MLG) - BRAKE HYDRAULIC HOSES - INSTALLATION
CORRECTION
(SHEET 5 OF 5)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
40 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 41

Table 1: 737NG Fleet Support Brake Replacement Service Bulletins
SubjectRevisionModelService Bulletin
Number
LANDING GEAR - Wheels and Brakes -
Replace Steel Brakes and Wheels with
Messier-Bugatti Carbon Brakes and Wheels
for 737-700 Airplanes
3 (or earlier
revisions)
737-700737-32-1408
LANDING GEAR - Wheels and Brakes -
Replace Steel Brakes and Wheels with
Goodrich Carbon Brakes and Wheels for
737-700 Airplanes
3 (or earlier
revisions)
737-700737-32-1433
LANDING GEAR - Wheels and Brakes -
Replace Steel Brakes and Wheels with
Messier-Bugatti-Dowty Carbon Brakes and
Wheels for 737-800 Airplanes
4 (or earlier
revisions)
737-800737-32-1429
LANDING GEAR - Wheels and Brakes -
Replace Steel Brakes and Wheels with
Goodrich Carbon Brakes and Wheels for
737-800 Airplanes
4 (or earlier
revisions)
737-800737-32-1441
LANDING GEAR - Wheels and Brakes -
Main Landing Gear Steel Brakes and Relat-
ed Wheels to Messier-Bugatti Carbon
Brakes and Related Wheels Replacement
for 737-900 Airplanes
1 (or earlier
revisions)
737-900737-32-1456
LANDING GEAR - Wheels and Brakes -
Main Landing Gear Steel Brakes and Relat-
ed Wheels to Goodrich Carbon Brakes and
Related Wheels Replacement for 737-900
Airplanes
2 (or earlier
revisions)
737-900737-32-1457
LANDING GEAR - Wheels and Brakes -
Main Landing Gear Steel Brakes and Relat-
ed Wheels to Messier-Bugatti-Dowty Carbon
Brakes and Related Wheels Replacement
for 737-900ER Airplanes
3 (or earlier
revisions)
737-900ER737-32-1430
LANDING GEAR - Wheels and Brakes -
Replace Steel Brakes and Wheels with
Goodrich Carbon Brakes and Wheels for
737-900ER Airplanes
3 (or earlier
revisions)
737-900ER737-32-1449
APPENDIX A:  BRAKE REPLACEMENT SERVICE BULLETINS
(SHEET 1 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
41 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 42

Table 2: 737NG Master Change Brake Replacement Service Bulletins
SubjectRevisionModelService Bulletin
Number
LANDING GEAR - Wheels and Brakes -
Change Existing Main Landing Gear Carbon
Brakes and Wheels to Steel Brakes and
Wheels
1 (or earlier
revisions)
737-700737-32-1510
LANDING GEAR - Wheels and Brakes -
Change Existing Main Landing Gear Carbon
Brakes and Wheels to Steel Brakes and
Wheels
Original Issue737-700737-32-1549
LANDING GEAR - Wheels and Brakes -
Replacement of Existing Main Landing Gear
Carbon Brakes and Wheels with Steel
Brakes and Wheels
25 (or earlier
revisions)
737-700,
737-800
737-32-1494
LANDING GEAR - Wheels and Brakes -
Replacement of Main Landing Gear Steel
Brakes and Wheels with Carbon Brakes and
Wheels (737-800)
Original Issue737-800737-32-1556
APPENDIX A:  BRAKE REPLACEMENT SERVICE BULLETINS
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
42 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 43

This Appendix applies only to: Group 1, Configuration 3-5.
1. Do the Antiskid Valve Operational Test. Refer to 737-600/700/800/900 AMM 32-42-00 as an accepted
procedure.
NOTE: One person must be stationed at the main landing gear brakes to observe the movement of
the brake pistons or wear pins to make sure the correct brake releases and reapplies.
a. During the Normal and Alternate Antiskid Valve Operational Test, it must be confirmed that pistons
on the applicable brake or brake pair release and then apply again, and that there are no fault
codes on the Antiskid/Autobrake Control Unit (AACU) display.
(1) If the pistons on the applicable brake or brake pair do not release and then apply again, or
any fault code is found, do all applicable on-condition corrective actions and repeat the test
until the pistons on the applicable brake or brake pair release and then apply again and no
fault code is found.
APPENDIX B: ANTISKID VALVE OPERATIONAL TEST
(SHEET 1 OF 1)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
43 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

### Page 44

This Appendix applies only to: Group 1, Configuration 3-5.
1. Do the Transducer Operational Test. Refer to 737-600/700/800/900 AMM 32-42-00 as an accepted
procedure.
NOTE: One person must be stationed at the main landing gear brakes to observe the movement of
the brake pistons or wear pins to make sure the correct brake releases and reapplies.
a. During the Transducer Operational Test, it must be confirmed that the brake at the paired wheel
releases and that the controlled brake releases momentarily and then reapplies again in 5 to 10
seconds when the movement of the transducer is stopped.
(1) If the brake at the paired wheel does not release or the controlled brake does not release
momentarily and then reapply in 5 to 10 seconds when the movement of the transducer is
stopped, do all applicable on-condition corrective actions and repeat the test until the brake
at the paired wheel releases and the controlled brake releases momentarily and then reapplies
again in 5 to 10 seconds when the movement of the transducer is stopped.
APPENDIX C: TRANSDUCER OPERATIONAL TEST
(SHEET 1 OF 1)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: October 14, 2025
737-32A1599 RB
44 of 44
REQUIREMENTS BULLETIN 737-32A1599
ALERTALERT

---
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