# Boeing Alert Service Bulletin 737-30A1081: Revision 1

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2026-7237, the docket of a proposed AD (Federal Register 2026-16795). Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Service Bulletin 737-30A1081](https://openairdocs.org/service-documents/boeing/737-30a1081.md)
- Title as filed: RB-737-30A1081-01-ICE AND RAIN PROTECTION - AOA Sensor - Case Heater Installation - Reduced file
- Pages: 86
- PDF: https://openairdocs.org/files/sha256/4d/6e/4d6ec92deb1abce2f95b5144cf2304cf78aa36bcc2124cece2f1798964d9c53f
- Page: https://openairdocs.org/service-documents/boeing/737-30a1081/file/4d6ec92deb1a

## Text

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### Page 1

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Revision Transmittal SheetNumber: 737-30A1081 RBOriginal Issue: June 26, 2025
Revision 1: April 30, 2026
ATA System: 3000 2732
SUBJECT: ICE AND RAIN PROTECTION - Angle of Airflow Sensor - Case Heater Installation
This revision includes all pages of the requirements bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION
Federal Aviation Administration (FAA) Airworthiness Directive AD 2019-09-01 is related to this service bulletin.
The effective date of AD 2019-09-01 is June 26, 2019.
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to Requirements
Bulletin 737-30A1081 RB. The Airworthiness Directive will make the compliance tasks and times given in
Requirements Bulletin 737-30A1081 RB mandatory.
Effects of this Revision on airplanes on which the Original Issue was previously done:
None.
REASON FOR REVISION
This revision is sent to provide corrections and clarifications to the work instructions, based on findings from a
recent validation of this bulletin.
These sections were changed:
–
General Information, changed text of an existing note.
– FIGURE 1 and FIGURE 2, added fastener reference.
– FIGURE 5, changed illustration and ground wire position.
– FIGURE 6, changed illustration.
– FIGURE 13, changed wire bundle routing illustrations.
– FIGURE 15, corrected step numbers in illustration. Added optional part to step table.
– FIGURE 16, changed wire bundle routing illustrations.
– FIGURE 18, added optional part to step table.
– APPENDIX A, added text to general note.
Vertical lines are put on the left edge of each page, except in Effectivity and format changes, to show the location
of all content changes.
Pages with no vertical lines have no changes.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
5 of 90

### Page 2

REVISION HISTORY
Service BulletinService BulletinRequirement BulletinRequirement Bulletin
737-30A1081737-30A1081737-30A1081 RB737-30A1081 RB
Issue DateIssue Date
June 26, 2025Original Issue:June 26, 2025Original Issue:
April 30, 2026Revision 1:April 30, 2026Revision 1:
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
6 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 3

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-30A1081 RB
Original Issue:
June 26, 2025
Revision 1: April 30, 2026
ATA System: 3000 2732
SUBJECT: ICE AND RAIN PROTECTION - Angle of Airflow Sensor - Case Heater Installation
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 737-300, 737-400, 737-500 Airplane(s), line number(s) 1001, 1007,
1015, 1022, 1030, 1037, 1043, 1057, 1073, 1076, 1080, 1083, 1090, 1096, 1098, 1100-1101,
1103-1104, 1106-1108, 1110-1112, 1114-1116, 1118-1119, 1122-1130, 1132, 1134, 1136-1142,
1146-1148, 1152-1153, 1156, 1158-1159, 1161-1164, 1166, 1168-1171, 1174-1175, 1177,
1180-1181, 1187-1188, 1191-1193, 1195, 1198, 1200-1202, 1204-1209, 1211-1222, 1224-1225,
1227, 1229, 1231-1235, 1237, 1239-1240, 1242-1244, 1246, 1248-1251, 1255, 1258-1260,
1263-1264, 1268-1274, 1277-1278, 1280-1282, 1284-1294, 1297, 1300-1302, 1304-1312,
1314-1317, 1320-1327, 1330-1332, 1334-1337, 1339, 1341, 1343-1346, 1348-1350, 1352-1354,
1356-1360, 1362-1368, 1370, 1372-1376, 1378, 1381-1386, 1388-1391, 1393-1395, 1398, 1400,
1402, 1406-1411, 1413, 1417, 1419, 1421, 1423, 1425, 1427-1428, 1430, 1432-1436, 1438-1441,
1443-1445, 1447-1449, 1454-1455, 1457-1463, 1465-1471, 1473-1477, 1479, 1481, 1484-1485,
1487, 1489-1501, 1504-1517, 1519-1521, 1524-1526, 1528-1529, 1531-1542, 1545-1550,
1552-1557, 1559, 1562, 1564, 1566-1568, 1570-1574, 1576-1578, 1582, 1586-1591, 1593-1596,
1598-1602, 1604-1639, 1641-1642, 1644-1648, 1650-1654, 1656-1664, 1666-1668, 1671-1677,
1679-1680, 1682-1705, 1707-1718, 1720-1738, 1740-1760, 1762, 1764, 1766-1770, 1772,
1774-1794, 1796-1823, 1825-1827, 1829-1832, 1834-1837, 1839-1864, 1866-1877, 1879-1894,
1896-1922, 1924-1970, 1972-2003, 2005-2051, 2053-2086, 2088-2111, 2114-2134, 2136-2145,
2147-2199, 2201-2289, 2291-2310, 2312-2352, 2354-2375, 2377-2382, 2384-2392, 2394-2399,
2401-2576, 2578-2605, 2607-2731, 2734-2769, 2771-2850, 2852-2932, 2934-2981, 2983-3132
in 4 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
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
7 of 90

### Page 4

The Variable Numbers and Group Information for the applicable airplanes is given below.
DESCRIPTIONCONFIGURATIONGROUP
737-300 and 737-400 airplanes that have different concurrent
requirements and different wire kits.
- 1
737-300 airplanes that have different concurrent requirements and
different wire kits.
- 2
737-300, 737-400 and 737-500 airplanes that have different
concurrent requirements and different wire kits.
- 3
737-300, 737-400 and 737-500 airplanes that have different
concurrent requirements and different wire kits.
- 4
Airplane Models:
737-300, 737-400, 737-500
GroupVariable Number
3PJ301 - PJ302
3PJ551 - PJ561
3PJ601 - PJ615
3PJ811
3PJ816 - PJ817
1PM381
3PM382 - PM385
3PM387 - PM399
3PM401 - PM402
3PM404 - PM405
3PM407 - PM417
3PM541 - PM549
3PM551 - PM557
3PM559 - PM564
1PP001 - PP010
1PP013 - PP014
1PP017 - PP030
1PP034
GroupVariable Number
1PP036
1PP039 - PP041
1PP043
1PP047
3PP048 - PP054
1PP101
1PP104 - PP108
1PP110
1PP113 - PP119
1PP122 - PP139
3PP140 - PP160
1PP163 - PP164
1PP166 - PP167
1PP169
1PP181 - PP197
3PP198 - PP199
1PP202 - PP203
1PP221
GroupVariable Number
1PP232 - PP234
1PP237 - PP243
1PP281 - PP282
1PP284 - PP286
1PP301 - PP305
1PP351 - PP353
1PP376 - PP382
1PP384
1PP391 - PP393
1PP401 - PP415
1PP417
1PP419 - PP423
1PP425
1PP427 - PP430
1PP432 - PP436
1PP440
1PP471 - PP474
1PP501 - PP507
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
8 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 5

GroupVariable Number
3PP508 - PP520
1PP521 - PP522
1PP631
1PP634
1PP651 - PP652
1PP671 - PP673
1PP676 - PP677
1PP679
1PP681 - PP688
1PP690 - PP694
1PP698
1PP702 - PP703
1PP711 - PP716
1PP719 - PP723
1PP725
1PP727 - PP729
1PP731
1PP771 - PP779
1PP801 - PP804
3PP805 - PP808
1PP821 - PP827
1PP831 - PP835
1PP837 - PP841
1PP843
1PP845 - PP848
1PP852
1PP862
1PP865 - PP870
1PP872
3PP874 - PP877
1PP892 - PP899
1PP901 - PP904
1PP906 - PP911
GroupVariable Number
1PP913 - PP915
3PP917 - PP919
3PP921
3PP923
3PP925 - PP930
1PP931 - PP936
1PP946 - PP948
1PP951 - PP952
1PP962 - PP965
3PP966 - PP967
1PP983 - PP984
3PP985 - PP990
1PP991
2PQ001 - PQ012
2PQ014
4PQ015
2PQ026 - PQ028
2PQ030 - PQ041
1PQ051 - PQ067
3PQ068 - PQ085
1PQ086 - PQ090
3PQ091 - PQ092
1PQ101 - PQ113
1PQ115 - PQ131
1PQ133 - PQ151
3PQ153 - PQ184
3PQ186 - PQ199
3PQ201 - PQ202
1PQ221 - PQ223
3PQ224 - PQ226
3PQ228
3PQ230
1PQ231
GroupVariable Number
1PQ233 - PQ236
3PQ237
1PQ241 - PQ243
1PQ251 - PQ254
3PQ255 - PQ267
1PQ281
3PQ284 - PQ293
3PQ295 - PQ299
1PQ301
3PQ302 - PQ307
3PQ331 - PQ332
3PQ341 - PQ348
3PQ361 - PQ373
3PQ391 - PQ395
3PQ401 - PQ412
3PQ414 - PQ418
3PQ421
3PQ431 - PQ438
3PQ447 - PQ448
3PQ451
3PQ454
3PQ471 - PQ475
3PQ479 - PQ481
3PQ487
3PQ491 - PQ493
3PQ771 - PQ772
3PQ791 - PQ793
4PQ801 - PQ805
4PQ931 - PQ935
4PQ951
3PQ971 - PQ972
3PQ974 - PQ997
3PR001 - PR017
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
9 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 6

GroupVariable Number
4PR021 - PR026
4PR028 - PR034
4PR041 - PR045
3PR061 - PR072
3PR077 - PR080
4PR081 - PR082
3PR091 - PR092
3PR096
3PR101
4PR121 - PR122
3PR131 - PR132
3PR141 - PR143
4PR161 - PR172
3PR181
3PS601 - PS618
3PS620 - PS631
3PS636 - PS638
3PS641 - PS644
3PS652 - PS657
3PS666 - PS668
3PS691 - PS692
3PS701 - PS706
3PS751 - PS799
3PS811
3PS836 - PS837
3PS841 - PS846
3PS851 - PS852
3PS856
3PS861 - PS863
3PS866 - PS868
3PS871 - PS874
3PS896 - PS897
3PS901 - PS941
GroupVariable Number
3PS956 - PS957
4PS961 - PS963
3PS971 - PS978
3PT002 - PT015
3PT021 - PT025
3PT027 - PT031
3PT041 - PT064
3PT101 - PT105
3PT121
3PT123 - PT138
3PT146 - PT148
3PT161 - PT170
3PT181 - PT188
3PT211 - PT220
4PT295
3PT301 - PT309
3PT331 - PT360
3PT381 - PT395
3PT397 - PT399
3PT401 - PT438
3PT501 - PT517
4PT561
4PT563 - PT565
3PT581 - PT586
3PT611 - PT621
3PT641 - PT644
4PT651 - PT656
3PT671 - PT672
3PT681 - PT685
3PT701 - PT703
3PT716
3PT721 - PT725
3PT801 - PT834
GroupVariable Number
3PT851 - PT853
4PT854
3PT871 - PT886
3PT901 - PT905
3PT907 - PT930
3PT971 - PT973
3PT981 - PT985
3PT996
3PU001 - PU025
3PU301
3PU311 - PU313
1PV001 - PV003
1PV006 - PV010
3PV012 - PV023
3PV025 - PV055
3PV201 - PV203
4PV204 - PV209
4PV226 - PV229
3PV232 - PV237
3PV271
4PV281 - PV287
3PV296
3PV301 - PV302
3PV351
3PV356 - PV357
1PW001 - PW002
1PW004 - PW007
1PW009 - PW011
3PW013 - PW026
3PW028 - PW031
3PW033 - PW054
1PW061
3PW063
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
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REQUIREMENTS BULLETIN 737-30A1081
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GroupVariable Number
3PW065 - PW068
3PW072
3PW086 - PW088
1PW091
3PW093 - PW094
3PW101 - PW102
3PW106
3PW111 - PW120
3PW156 - PW157
3PW161 - PW162
3PW164 - PW171
3PW201 - PW252
3PW261 - PW268
4PW271 - PW276
3PW278
3PW281 - PW291
GroupVariable Number
4PW293
3PW296
3PW301 - PW327
3PW401 - PW408
3PW411 - PW418
4PW421 - PW424
3PW431 - PW435
4PW441 - PW450
3PW461 - PW467
1PW501
3PW502 - PW504
3PW511 - PW522
3PW524 - PW530
4PW531 - PW550
4PW556 - PW557
3PW561 - PW564
GroupVariable Number
3PW571 - PW576
3PW591 - PW596
3PW611 - PW619
3PW621 - PW622
3PW631 - PW636
3PW661 - PW662
3PW681 - PW683
3PW701 - PW702
3PW711 - PW717
3PW741 - PW742
3PW761
3PW771
3PW831
3PW851 - PW856
--
--
B.
Spares Affected
Examine your spares supply for the parts or components identified below. If any parts or components
are found, refer to Collins Aerospace SB 861CAS2-34-01 or Collins Aerospace SB 861CAS3-34-02
for the recommended action.
Part Number
10-62047-4 (861CAS2)
10-62047-5 (861CAS3)
2.
CONCURRENT REQUIREMENTS
The service bulletin(s) listed below must be done before or at the same time as Requirements Bulletin
737-30A1081 RB:
Group 1-2:
DescriptionService BulletinCompany
ICE AND RAIN PROTECTION - Pitot Static
Tubes, Temperature Probe, and Alpha Vane
Anti-Icing System - Change P5 and P18-3 Panels
to Activate Automated Probe Heat System
737-30A1064 Revision 2Boeing
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 8

Group 1-2:
DescriptionService BulletinCompany
ICE AND RAIN PROTECTION - Pitot Static
Tubes, Temperature Probe, and Alpha Vane
Anti-Icing System - J18 Junction Box Installation
737-30-1067 Revision 1Boeing
ICE AND RAIN PROTECTION - Pitot Static
Tubes, Temperature Probe, and Alpha Vane
Anti-Icing System - Air Data Probe Heat Automa-
tion Wire Provisions Installation
737-30-1068 Revision 1Boeing
EQUIPMENT/FURNISHINGS - Flight Compart-
ment/Passenger Compartment/Cargo Compart-
ment/Main Equipment Center - Insulation Blanket
Replacement
737-25-1572 Original IssueBoeing
NAVIGATION - ANGLE OF AIRFLOW SENSOR
(AOAS) MODEL (PNR) 861CAS2 NO MOD
THRU MOD J MODIFICATION TO MODEL
(PNR) 861CAS2 MOD K
861CAS2-34-01 Initial IssueCollins Aerospace
OR
NAVIGATION - ANGLE OF AIRFLOW SENSOR
(AOAS) MODEL (PNR) 861CAS3 NO MOD
THRU MOD J MODIFICATION TO MODEL
(PNR) 861CAS3 MOD K
861CAS3-34-02 Initial IssueCollins Aerospace
Group 3-4:
DescriptionService BulletinCompany
ICE AND RAIN PROTECTION - Pitot Static
Tubes, Temperature Probe, and Alpha Vane
Anti-Icing System - Change P5 and P18-3 Panels
to Activate Automated Probe Heat System
737-30A1064 Revision 2Boeing
ICE AND RAIN PROTECTION - Pitot Static
Tubes, Temperature Probe, and Alpha Vane
Anti-Icing System - J18 Junction Box Installation
737-30-1067 Revision 1Boeing
ICE AND RAIN PROTECTION - Pitot Static
Tubes, Temperature Probe, and Alpha Vane
Anti-Icing System - Air Data Probe Heat Automa-
tion Wire Provisions Installation
737-30-1068 Revision 1Boeing
NAVIGATION - ANGLE OF AIRFLOW SENSOR
(AOAS) MODEL (PNR) 861CAS2 NO MOD
THRU MOD J MODIFICATION TO MODEL
(PNR) 861CAS2 MOD K
861CAS2-34-01 Initial IssueCollins Aerospace
OR
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 9

Group 3-4:
DescriptionService BulletinCompany
NAVIGATION - ANGLE OF AIRFLOW SENSOR
(AOAS) MODEL (PNR) 861CAS3 NO MOD
THRU MOD J MODIFICATION TO MODEL
(PNR) 861CAS3 MOD K
861CAS3-34-02 Initial IssueCollins Aerospace
3.
COMPLIANCE
Federal Aviation Administration (FAA) Airworthiness Directive AD 2019-09-01 is related to this service
bulletin. The effective date of AD 2019-09-01 is June 26, 2019.
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to
Requirements Bulletin 737-30A1081 RB. The Airworthiness Directive will make the compliance tasks and
times given in Requirements Bulletin 737-30A1081 RB mandatory.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
13 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 10

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.
Accomplish the required action(s), based on the applicable condition(s) in Table(s) 1, in accordance with
Accomplishment Instructions.
Table 1: Angle of Airflow Sensor External Case Heater Installation
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Within 24 months after
the Original Issue date of
Requirements Bulletin
737-30A1081 RB or
within 5,400 flight hours
after the Original Issue
date of Requirements
Bulletin 737-30A1081
RB, whichever occurs
first.
ACTION 1: Do all applicable AC-
COMPLISHMENT INSTRUCTIONS
actions identified in the service
bulletins specified in CONCUR-
RENT REQUIREMENTS.
All airplanes
-ACTION 2: Install the new External
Case Heaters (ECHs) on the left
and right Angle of Airflow (AOA)
sensors.
-ACTION 3: Do the Angle of Airflow
Sensor External Case Heater
Functional Test and make sure the
test is passed. If the test fails, do
applicable corrective action and re-
peat the test until the test passes.
4,000 flight hours.-ACTION 4: Repeat the Angle of
Airflow Sensor External Case
Heater Functional Test and make
sure the test is passed. If the test
fails, do applicable corrective action
and repeat the test until the test
passes.
4.
APPROVAL
This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified
in this service bulletin comply with the applicable regulations and are FAA approved, as well as European
Union Aviation Safety Agency (EASA) approved for all EASA approved airplanes listed in the service bulletin
effectivity. This service bulletin and its approval were based on the airplane in its original Boeing delivery
configuration or as modified by other approved Boeing changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected by
this requirements bulletin, the operator is responsible for obtaining appropriate regulatory agency approval
before incorporating this requirements bulletin.
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
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REQUIREMENTS BULLETIN 737-30A1081
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### Page 11

In addition, the Manager of the FAA Continued Operational Safety Branch approves the accomplishment
of the inspections defined in this bulletin revision as an alternative method of compliance to accomplishing
the requirements of paragraph (h) of AD 2019-09-01. All provisions of AD 2019-09-01 that are not specifically
referenced in the above statement remain fully applicable and must be complied with accordingly.
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
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REQUIREMENTS BULLETIN 737-30A1081
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### Page 12

Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT
BLANK PAGE

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5.    ACCOMPLISHMENT INSTRUCTIONS
A.
GENERAL INFORMATION
KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF
METAL PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED
MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE
BUNDLES CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES
CAN CAUSE SPARKS OR OTHER ELECTRICAL DAMAGE.
CAUTION
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).
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
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REQUIREMENTS BULLETIN 737-30A1081
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### Page 14

— 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.
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. 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.
8. Use the approved fastener, process and material substitutions in accordance with
SRM Chapter 51.
9. 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.
10. Refer to the SWPM 20-10-11 and SWPM 20-10-12 for the wire installation procedures,
and SWPM 20-10-19 for the wire separation requirements, as accepted procedures.
11. The necessary conditions for selection of clamp type and size are included in SWPM
20-10-12. If any wire bundle support clamp specified in this service bulletin does not
make a correct fit on the wire bundle, refer to SWPM 20-10-12 as an accepted
procedure to select a clamp that fits correctly.
12. If the length of any fastener specified in this service bulletin does not meet installation
standards given in SRM Chapter 51, then a fastener of the same specification, or
an approved substitute, with a length which meets the installation standards given
in SRM Chapter 51 may be used. Refer to SOPM 20-50-01 for ADJUSTMENT OF
GRIP LENGTH and USE OF WASHERS as an accepted procedure.
13. Use of colors in Figures is based on guidance from the ATA e-Business Program
(ATA) iSpec 2200.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
18 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 15

B. WORK INSTRUCTIONS
Action Required for Compliance
1. Requirements:
Group 1, 3:
Table 1: Angle of Airflow Sensor External Case Heater Installation
Refer to the listed
procedures in SB 737-
30A1081 Original Is-
sue or later approved
revisions as an ac-
cepted procedure.
Method of ComplianceActionCondition
--ACTION 1: Do all applicable
ACCOMPLISHMENT INSTRUC-
TIONS actions identified in the
service bulletins specified in
CONCURRENT REQUIRE-
MENTS.
All Airplanes
PART 1: Open Access.-ACTION 2: Install the new Exter-
nal Case Heaters (ECHs) on the
left and right Angle of Airflow
(AOA) sensors.
PART 2: Angle of Air-
flow Sensor Removal.
-
-FIGURE 1
-FIGURE 2
-FIGURE 3
-FIGURE 4
PART 3: Install
Changed Angle of Air-
flow Sensor.
-
-FIGURE 5
-FIGURE 6
-FIGURE 7, FIGURE 8 and
FIGURE 9
-FIGURE 13, FIGURE 14 and
FIGURE 15
-FIGURE 16, FIGURE 17 and
FIGURE 18
-FIGURE 19
PART: 4 Angle of Air-
flow Sensor Test.
-
Export Controlled ECCN: 9E991
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 16

Group 1, 3:
Table 1: Angle of Airflow Sensor External Case Heater Installation
Refer to the listed
procedures in SB 737-
30A1081 Original Is-
sue or later approved
revisions as an ac-
cepted procedure.
Method of ComplianceActionCondition
-APPENDIX AACTION 3: Do the Angle of Air-
flow Sensor External Case
Heater Functional Test and
make sure the test is passed. If
the test fails, do applicable cor-
rective action and repeat the
test until the test passes.
All Airplanes
PART 5: Close Access.-
-APPENDIX AACTION 4: Repeat the Angle of
Airflow Sensor External Case
Heater Functional Test and
make sure the test is passed. If
the test fails, do applicable cor-
rective action and repeat the
test until the test passes.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
20 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 17

Group 2, 4:
Table 2: Angle of Airflow Sensor External Case Heater Installation
Refer to the listed
procedures in SB 737-
30A1081 Original Is-
sue or later approved
revisions as an ac-
cepted procedure.
Method of ComplianceActionCondition
--ACTION 1: Do all applicable ACCOM-
PLISHMENT INSTRUCTIONS actions
identified in the service bulletins speci-
fied in CONCURRENT REQUIRE-
MENTS.
All Airplanes
PART 1: Open Access.-ACTION 2: Install the new External
Case Heaters (ECHs) on the left and
right Angle of Airflow (AOA) sensors. PART 2: Angle of Air-flow Sensor Removal.-
-FIGURE 1
-FIGURE 2
-FIGURE 3
-FIGURE 4
PART 3: Install
Changed Angle of Air-
flow Sensor.
-
-FIGURE 5
-FIGURE 6
-FIGURE 10, FIGURE 11 and
FIGURE 12
-FIGURE 13, FIGURE 14 and
FIGURE 15
-FIGURE 16, FIGURE 17 and
FIGURE 18
-FIGURE 19
PART: 4 Angle of Air-
flow Sensor Test.
-
-APPENDIX AACTION 3: Do the Angle of Airflow
Sensor External Case Heater Function-
al Test and make sure the test is
passed. If the test fails, do applicable
corrective action and repeat the test
until the test passes.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
21 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 18

Group 2, 4:
Table 2: Angle of Airflow Sensor External Case Heater Installation
Refer to the listed
procedures in SB 737-
30A1081 Original Is-
sue or later approved
revisions as an ac-
cepted procedure.
Method of ComplianceActionCondition
PART 5: Close Access.-ACTION 3: Do the Angle of Airflow
Sensor External Case Heater Function-
al Test and make sure the test is
passed. If the test fails, do applicable
corrective action and repeat the test
until the test passes.
All Airplanes
-APPENDIX AACTION 4: Repeat the Angle of Airflow
Sensor External Case Heater Function-
al Test and make sure the test is
passed. If the test fails, do applicable
corrective action and repeat the test
until the test passes.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1: April 30, 2026
22 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 19 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
VERTICAL CENTER FASTENER
EXTERNAL CASE (3
HEATER
ANGLE OF AIRFLOW
SENSOR
ANGLE OF AIRFLOW SENSOR
EXTERNAL CASE HEATER
3011117
FIGURE 1: LEFT SIDE ANGLE OF AIRFLOW SENSOR - EXTERNAL CASE HEATER - INSTALLATION
(SHEET 1 OF 2)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  23 of 90

### Page 20

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
Bench-Work. Not
shown.
1201150-4EXTERNAL CASE
HEATER
Get 1
(a)(b)(c)3320574TERMINALInstall (New)
(a)(b)(g)-M22759/44-16-5WIREInstall (New)
(c) Torque to 32-38
inch pounds.
2MS16996-11SCREWInstall (New)
(c) 4NAS620A10LWASHERInstall (New)
Bench-Work. Not
shown.(d)
--RESISTANCEMeasure2
(e) 1MS16996-14SCREWInstall (New)3
(e) 1MS21299C3WASHERInstall (New)
(f) 1201150-4EXTERNAL CASE
HEATER
Install (New)4
(a) Make sure that the wire between the External Case Heater (ECH) ground terminals is 2.37 - 2.63 inches,
from ground terminal center to ground terminal center. Install terminals on wire, refer to SWPM 20-30-11
as an accepted procedure.
(b)
Make sure that the wire from the ECH to ground GD1229-S is 12 - 16 inches. Install terminals on wire,
refer to SWPM 20-30-11 as an accepted procedure.
(c) Clean the screws, washers, terminals and ECH body adjacent to the screws. Use Cleaning Procedure 5
- Removal of Contamination with Cleaning Solvent. Refer to SWPM 20-20-00 as an accepted procedure.
Category 1 Unsealed Nut Plate Direct Ground Stud Assembly, refer to SWPM 20-20-10 as an accepted
procedure.
(d) Measure the resistance between the terminal and the ECH body. Maximum resistance reading must not
exceed 0.001 ohms. Refer to SWPM 20-20-10 as an accepted procedure.
(e) Install the screw and washer on the ECH so that the clamp of the ECH can loosely clamp around the
Angle of Airflow (AOA) Sensor.
(f) Turn the external case heater min/max 1 turn counter clockwise from the vertical center line as shown to
avoid interference with adjacent parts and structure, when the AOA sensor is installed on the airplane.
Make sure that the ECH is between 0 - 0.05 inches from the AOA flange.
(g) Make sure the bend radius complies with standard wire practices. Refer to SWPM 20-10-11 as an accepted
procedure.
FIGURE 1: LEFT SIDE ANGLE OF AIRFLOW SENSOR - EXTERNAL CASE HEATER - INSTALLATION
(SHEET 2 OF 2)
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Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 21 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
- VERTICAL CENTER FASTENER
EXTERNAL CASE (3
HEATER
ANGLE OF AIRFLOW
SENSOR
ANGLE OF AIRFLOW SENSOR
EXTERNAL CASE HEATER
3011126
FIGURE 2: RIGHT SIDE ANGLE OF AIRFLOW SENSOR - EXTERNAL CASE HEATER - INSTALLATION
(SHEET 1 OF 2)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  25 of 90

### Page 22

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
Bench-Work. Not
shown.
1201150-4EXTERNAL CASE
HEATER
Get 1
(a)(b)(c)3320574TERMINALInstall (New)
(a)(b)(g)-M22759/44-16-5WIREInstall (New)
(c) Torque to 32-38
inch pounds.
2MS16996-11SCREWInstall (New)
(c) 4NAS620A10LWASHERInstall (New)
Bench-Work. Not
shown.(d)
--RESISTANCEMeasure2
(e) 1MS16996-14SCREWInstall (New)3
(e) 1MS21299C3WASHERInstall (New)
(f) 1201150-4EXTERNAL CASE
HEATER
Install (New)4
(a) Make sure that the wire between the External Case Heater (ECH) ground terminals is 2.37 - 2.63 inches,
from ground terminal center to ground terminal center. Install terminals on wire, refer to SWPM 20-30-11
as an accepted procedure.
(b)
Make sure that the wire from the ECH to ground GD1229-S is 12 - 16 inches. Install terminals on wire,
refer to SWPM 20-30-11 as an accepted procedure.
(c) Clean the screws, washers, terminals and ECH body adjacent to the screws. Use Cleaning Procedure 5
- Removal of Contamination with Cleaning Solvent. Refer to SWPM 20-20-00 as an accepted procedure.
Category 1 Unsealed Nut Plate Direct Ground Stud Assembly, refer to SWPM 20-20-10 as an accepted
procedure.
(d) Measure the resistance between the terminal and the ECH body. Maximum resistance reading must not
exceed 0.001 ohms. Refer to SWPM 20-20-10 as an accepted procedure.
(e) Install the screw and washer on the ECH so that the clamp of the ECH can loosely clamp around the
Angle of Airflow (AOA) Sensor.
(f) Turn the external case heater min/max 1 turn counter clockwise from the vertical center line as shown to
avoid interference with adjacent parts and structure, when the AOA sensor is installed on the airplane.
Make sure that the ECH is between 0 - 0.05 inches from the AOA flange.
(g) Make sure the bend radius complies with standard wire practices. Refer to SWPM 20-10-11 as an accepted
procedure.
FIGURE 2: RIGHT SIDE ANGLE OF AIRFLOW SENSOR - EXTERNAL CASE HEATER - INSTALLATION
(SHEET 2 OF 2)
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Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
26 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 23

FIGURE 3: FLIGHT COMPARTMENT - ELECTRICAL GROUND STUD GD1229-S - INSTALLATION
(SHEET 1 OF 4)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
27 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 24 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
1.40
(3)
GD1229-S
FRAME
ASSEMBLY-
10.00
WL 208.0 OR  INBD
FLOOR (REF)
LEFT SIDE LOWER FRAME AT STA 243.7
(VIEW LOOKING FORWARD)
NBI
LEFT SIDE LOWER FRAME AT STA 243.7
(VIEW LOOKING FORWARD)
3014202
FIGURE 3: FLIGHT COMPARTMENT - ELECTRICAL GROUND STUD GD1229-S - INSTALLATION
(SHEET 2 OF 4)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  Export Controlled ECCN: 9E991  737-30A1081 RB
See page 1 for details  28 of 90

### 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) 1-HOLEDrill 1
(b) 1-HOLEClean/Deburr2
(e) -TYPE 2, CLASS ACHEMICAL CONVER-
SION COATING
Apply3
(c) 1BACS12HN3-14SCREWInstall (New)4
(c) 1BACW10EC3CZNWASHER, SPRINGInstall (New)
(c) 2NAS1149D0316HWASHERInstall (New)
(c) Torque to 35 - 40
inch-pounds.
1BACN11DE3TNUT, HEXInstall (New)
(d) --RESISTANCEMeasure5
(f) -BMS10-11, TYPE IPRIMERApply6
(g)(h)1BACT19J4TAPE, IDInstall (New)7
(a)
Drill the frame assembly at the location shown. Hole diameter is 0.218 - 0.229 inch. Refer to 737-300
SRM 51-40-05 or 737-400 SRM 51-40-05 or 737-500 SRM 51-40-05 as accepted procedures.
FIGURE 3: FLIGHT COMPARTMENT - ELECTRICAL GROUND STUD GD1229-S - INSTALLATION
(SHEET 3 OF 4)
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737-30A1081 RBRevision 1 April 30, 2026
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 26

More DataQtyIdentificationNameTaskStep
(b)
Clean away any debris and/or metal shavings from the hole in the frame assembly. Refer to SOPM 20-
30-03 as an accepted procedure.
(c) Clean the hole in the frame assembly, the area adjacent to the hole, the wire bundle terminal, the ground
stud screw and attaching parts. Use Cleaning Procedure 5 - Removal of Contamination with Cleaning
Solvent. Refer to SWPM 20-20-00 as an accepted procedure. Category 1 Unsealed Standard Pre-Installed
Ground Stud Installation using abrasive cleaning, refer to SWPM 20-20-10 as an accepted procedure.
(d) Measure the resistance between the stud and the structure. Maximum resistance reading must not exceed
0.001 ohms. Refer to SWPM 20-20-10 as an accepted procedure.
(e) Apply the chemical conversion coating where organic coating has been removed/exposed to the structure.
Refer to SOPM 20-43-03 as an accepted procedure.
(f) Apply the primer where organic coating has been removed/exposed to the structure. Refer to SOPM 20-
41-02 as an accepted procedure.
(g) Imprint with "GD1229-S".
(h) Refer to SOPM 20-50-05 and SWPM 20-10-11 as accepted procedures.
FIGURE 3: FLIGHT COMPARTMENT - ELECTRICAL GROUND STUD GD1229-S - INSTALLATION
(SHEET 4 OF 4)
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 27

FIGURE 4: FLIGHT COMPARTMENT - ELECTRICAL GROUND STUD GD1225-S - INSTALLATION
(SHEET 1 OF 4)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
31 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 28 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
GD1225-5 4
1.30-
10.00
WL 208.0 OR
FLOOR (REF)
FRAME
ASSEMBLY
RIGHT SIDE LOWER FRAME AT STA 243.7
(VIEW LOOKING FORWARD)
INBD
RIGHT SIDE LOWER FRAME AT STA 243.7
(VIEW LOOKING FORWARD)
3014205
FIGURE 4: FLIGHT COMPARTMENT - ELECTRICAL GROUND STUD GD1225-S - INSTALLATION
(SHEET 2 OF 4)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  Export Controlled ECCN: 9E991  737-30A1081 RB
See page 1 for details  32 of 90

### Page 29

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-HOLEDrill 1
(b) 1-HOLEClean/Deburr2
(e) -TYPE 2, CLASS ACHEMICAL CONVER-
SION COATING
Apply3
(c) 1BACS12HN3-14SCREWInstall (New)4
(c) 1BACW10EC3CZNWASHER, SPRINGInstall (New)
(c) 2NAS1149D0316HWASHERInstall (New)
(c) Torque to 35 - 40
inch-pounds.
1BACN11DE3TNUT, HEXInstall (New)
(d) --RESISTANCEMeasure5
(f) -BMS10-11, TYPE IPRIMERApply6
(g)(h)1BACT19J4TAPE, IDInstall (New)7
(a)
Drill the frame assembly at the location shown. Hole diameter is 0.218 - 0.229 inch. Refer to 737-300
SRM 51-40-05 or 737-400 SRM 51-40-05 or 737-500 SRM 51-40-05 as accepted procedures.
FIGURE 4: FLIGHT COMPARTMENT - ELECTRICAL GROUND STUD GD1225-S - INSTALLATION
(SHEET 3 OF 4)
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 30

More DataQtyIdentificationNameTaskStep
(b)
Clean away any debris and/or metal shavings from the hole in the frame assembly. Refer to SOPM 20-
30-03 as an accepted procedure.
(c) Clean the hole in the frame assembly, the area adjacent to the hole, the ground stud screw and attaching
parts. Use Cleaning Procedure 5 - Removal of Contamination with Cleaning Solvent. Refer to SWPM 20-
20-00 as an accepted procedure. Category 1 Unsealed Standard Pre-Installed Ground Stud Installation
using abrasive cleaning, refer to SWPM 20-20-10 as an accepted procedure.
(d) Measure the resistance between the stud and the structure. Maximum resistance reading must not exceed
0.001 ohms. Refer to SWPM 20-20-10 as an accepted procedure.
(e) Apply the chemical conversion coating where organic coating has been removed/exposed to the structure.
Refer to SOPM 20-43-03 as an accepted procedure.
(f) Apply the primer where organic coating has been removed/exposed to the structure. Refer to SOPM 20-
41-02 as an accepted procedure.
(g) Imprint with "GD1225-S".
(h) Refer to SOPM 20-50-05 and SWPM 20-10-11 as accepted procedures.
FIGURE 4: FLIGHT COMPARTMENT - ELECTRICAL GROUND STUD GD1225-S - INSTALLATION
(SHEET 4 OF 4)
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 31 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
VERTICAL
CENTER LINE
ANGLE OF
AIRFLOW
CONNECTOR
CABLE
HORIZONTAL
CENTER LINE
FWD
ANGLE OF AIRFLOW SENSOR
EXTERNAL CASE HEATER
A-A
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.
FIGURE 5: ANGLE OF AIRFLOW SENSOR LEFT SIDE - EXTERNAL CASE HEATER - ADJUST
(SHEET 1 OF 2)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  35 of 90

### Page 32

More DataQtyIdentificationNameTaskStep
(a)(b)1201150-4EXTERNAL CASE
HEATER
Adjust1
(c) 1MS16996-14SCREWTorque2
(a) Turn the external case heater min/max 1 turn counter clockwise from the vertical center line as shown to
avoid interference with adjacent parts and structure. Make sure that the ECH is between 0 - 0.05 inches
from the AOA flange.
(b)
Ink stamp 'A31' on the structure adjacent to the left side AOA sensor. Refer to SOPM 20-50-10 as an
accepted procedure. Markings must be visible after the AOA is installed. Marking to be black 0.19 inches
high. Adhesive-backed markers may be substituted for ink stamping. Refer to SOPM 20-50-05 as an ac-
cepted procedure.
(c) Torque to between 25 - 30 inch pounds. Make sure that the gap between the clamp flanges is not less
than 0.001 inches. Make sure that a minimum of three screw threads show when the screw is torqued.
FIGURE 5: ANGLE OF AIRFLOW SENSOR LEFT SIDE - EXTERNAL CASE HEATER - ADJUST
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
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36 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 33 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
VERTICAL
CENTER LINE
HORIZONTAL
CENTER LINE
ANGLE OF
AIRFLOW
CONNECTOR
CABLE
FWD
ANGLE OF AIRFLOW SENSOR
EXTERNAL CASE HEATER
A-A
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.
FIGURE 6: ANGLE OF AIRFLOW SENSOR RIGHT SIDE - EXTERNAL CASE HEATER - ADJUST
(SHEET 1 OF 2)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  37 01 90

### Page 34

More DataQtyIdentificationNameTaskStep
(a)(b)1201150-4EXTERNAL CASE
HEATER
Adjust1
(c) 1MS16996-14SCREWTorque2
(a) Turn the external case heater min/max 1 turn counter clockwise from the vertical center line as shown to
avoid interference with adjacent parts and structure. Make sure that the ECH is between 0 - 0.05 inches
from the AOA flange.
(b)
Ink stamp 'A30' on the structure adjacent to the right side AOA sensor. Refer to SOPM 20-50-10 as an
accepted procedure. Markings must be visible after the AOA is installed. Marking to be black 0.19 inches
high. Adhesive-backed markers may be substituted for ink stamping. Refer to SOPM 20-50-05 as an ac-
cepted procedure.
(c) Torque to between 25 - 30 inch pounds. Make sure that the gap between the clamp flanges is not less
than 0.001 inches. Make sure that a minimum of three screw threads show when the screw is torqued.
FIGURE 6: ANGLE OF AIRFLOW SENSOR RIGHT SIDE - EXTERNAL CASE HEATER - ADJUST
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
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REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 35 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
This Figure applies only to: Group 1, 3.
STA
203.8
STA
235.8
STA
259.5
MAIN EQUIPMENT CENTER
FWD
D8622J
266M  W1992  D15264  D8624J
D15266
W1992  • R1078
W1994
TB18
>TB19
J18 JUNCTION BOX
FIGURE 7: J18 JUNCTION BOX - WIRE BUNDLES W1992 AND W1994 - WIRE ROUTING
(SHEET 1 OF 1)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  Export Controlled ECCN: 9E991  137-30A1081 RE
See page 1 for details  39 of 90

### Page 36

This Figure applies only to: Group 1, 3.
REFERENCE: 737-300/400/500 WDM 30-31-01
Use wire kit 61-74518-103 and 61-74518-2001.
The find numbers (No.) shown below agree with the find number symbol in the figure.
More DataQtyIdentificationName
Find
No.
Refer to SWPM 20-81-12 as an
accepted procedure.
1BACC47DJ1CONTACT, SOCKET1
FIGURE 8: J18 JUNCTION BOX - WIRE BUNDLE W1992 - WIRE CHANGE
(SHEET 1 OF 2)
Export Controlled ECCN: 9E991
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Original Issue: June 26, 2025
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40 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 37

More DataQtyIdentificationName
Find
No.
Refer to SWPM 20-90-15 as an
accepted procedure.
2S280W555-920CONTACT, PIN, SIZE 202
Refer to SWPM 20-61-11 as an
accepted procedure.
2BACC47CN1SCONTACT, PIN3
- 161-74518-103WWIRE LIST4
Refer to SWPM 20-10-11 as an
accepted procedure.
-N0001947 (BMS13-
54GBT1C1FC85/14WH or
BMS13-
54GBT4C1FC60/25WH op-
tional)
POLYESTER, TAPE
FIGURE 8: J18 JUNCTION BOX - WIRE BUNDLE W1992 - WIRE CHANGE
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
41 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 38

This Figure applies only to: Group 1, 3.
REFERENCE: 737-300/400/500 WDM 30-31-01
Use wire kit 61-74518-105 and 61-74518-2001.
The find numbers (No.) shown below agree with the find number symbol in the figure.
More DataQtyIdentificationName
Find
No.
Refer to SWPM 20-81-12 as an
accepted procedure.
1BACC47DJ1CONTACT, SOCKET1
FIGURE 9: J18 JUNCTION BOX - WIRE BUNDLE W1994 - WIRE CHANGE
(SHEET 1 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
42 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 39

More DataQtyIdentificationName
Find
No.
Refer to SWPM 20-90-15 as an
accepted procedure.
2S280W555-920CONTACT, PIN, SIZE 202
Refer to SWPM 20-61-11 as an
accepted procedure.
2BACC47CN1SCONTACT, PIN3
- 161-74518-105WWIRE LIST4
Refer to SWPM 20-10-11 as an
accepted procedure.
-N0001947 (BMS13-
54GBT1C1FC85/14WH or
BMS13-
54GBT4C1FC60/25WH op-
tional)
POLYESTER, TAPE
FIGURE 9: J18 JUNCTION BOX - WIRE BUNDLE W1994 - WIRE CHANGE
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
43 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 40 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
This Figure applies only to: Group 2, 4.
STA
203.8
STA
235.8
STA
259.5
MAIN EQUIPMENT CENTER
015264  FWD
N1992
W1992
D8622J
W1992
R1077  D8624J
W1994
D15266
W1994  W1994
_ R1078
TB19
TB18
FWD
J18 JUNCTION BOX
3011183
FIGURE 10: J18 JUNCTION BOX - WIRE BUNDLES W1992 AND W1994 - WIRE ROUTING
(SHEET 1 OF 1)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  44 of 90

### Page 41

This Figure applies only to: Group 2, 4.
REFERENCE: 737-300/400/500 WDM 30-31-01
Use wire kit 61-74518-104 and 61-74518-2001.
The find numbers (No.) shown below agree with the find number symbol in the figure.
More DataQtyIdentificationName
Find
No.
Refer to SWPM 20-81-12 as an
accepted procedure.
1BACC47DJ1CONTACT, SOCKET1
FIGURE 11: J18 JUNCTION BOX - WIRE BUNDLE W1992 - WIRE CHANGE
(SHEET 1 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
45 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 42

More DataQtyIdentificationName
Find
No.
Refer to SWPM 20-90-15 as an
accepted procedure.
2S280W555-920CONTACT, PIN, SIZE 202
Refer to SWPM 20-61-11 as an
accepted procedure.
2BACC47CN1SCONTACT, PIN3
- 161-74518-104WWIRE LIST4
Refer to SWPM 20-10-11 as an
accepted procedure.
-N0001947 (BMS13-
54GBT1C1FC85/14WH or
BMS13-
54GBT4C1FC60/25WH op-
tional)
POLYESTER, TAPE
FIGURE 11: J18 JUNCTION BOX - WIRE BUNDLE W1992 - WIRE CHANGE
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
46 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 43

This Figure applies only to: Group 2, 4.
REFERENCE: 737-300/400/500 WDM 30-31-01
Use wire kit 61-74518-106 and 61-74518-2001.
The find numbers (No.) shown below agree with the find number symbol in the figure.
More DataQtyIdentificationName
Find
No.
Refer to SWPM 20-81-12 as an
accepted procedure.
1BACC47DJ1CONTACT, SOCKET1
FIGURE 12: J18 JUNCTION BOX - WIRE BUNDLE W1994 - WIRE CHANGE
(SHEET 1 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
47 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 44

More DataQtyIdentificationName
Find
No.
Refer to SWPM 20-90-15 as an
accepted procedure.
2S280W555-920CONTACT, PIN, SIZE 202
Refer to SWPM 20-61-11 as an
accepted procedure.
2BACC47CN1SCONTACT, PIN3
- 161-74518-106WWIRE LIST4
Refer to SWPM 20-10-11 as an
accepted procedure.
-N0001947 (BMS13-
54GBT1C1FC85/14WH or
BMS13-
54GBT4C1FC60/25WH op-
tional)
POLYESTER, TAPE
FIGURE 12: J18 JUNCTION BOX - WIRE BUNDLE W1994 - WIRE CHANGE
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
48 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 45 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
51 \
S-3 -
5-4-
5-5 -
S-6 -
5-7 -  MAIN EQUIPMENT
CENTER
5-8 -
S-9
S-10
S-11
S- 12~
S-13 -
S-14
S-15  W1996
S-16 .
STA
259.5 STA
251.62$7.7  STA
227.8
STA
211.8
STA
196.5  STA
178
UPPER LEFT SIDE
FLIGHT COMPARTMENT  3011303
FIGURE 13: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 1 OF 8)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  Export Controlled ECCN: 9E991  737-30A1081 RB
See page 1 for details  49 of 90

### Page 46 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
GD1229-S
W1996
D8626P
VENDOR WIRING
M/W D8626J
W1996
D8636J
VENDOR WIRING
M/W D8636P
W1996
GD49AC
- W1996
W1996
STA
259.5
FWD
STA
251.6
W1996  UPPER LEFT SIDE  STA
FLIGHT COMPARTMENT  243.7
(STA 243.7 TO STA 259.5
STA
251.6
STA
259.5
STA  LBL
270  50
STA
277
LEFT SIDE  3011304
FLIGHT COMPARTMENT FLOOR
FIGURE 13: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 2 OF 8)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  50 of 90

### Page 47 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
STA
STA  235.8
243.7
STA
251.6
STA
259.5
W1996
S-18-
S-19-
S-20-
S-21-
S-22
S-23
S-24-
LOWER LEFT SIDE  3011314
FIGURE 13: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 3 OF 8)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  51 of 90

### Page 48

FIGURE 13: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 4 OF 8)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
52 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 49

FIGURE 13: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 5 OF 8)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
53 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 50 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
203.8 W1996  STA  D8622P  AIR DISTRIBUTION  DUCT
STA
235.8  W1996
W1998
STA
259.5
~S-17
E11
D2598
D2618
J18  5.24
W1996(2)
FWD
LOWER RIGHT SIDE  3011312
(STA 178 TO 259.5)
FIGURE 13: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 6 OF 8)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  54 of 90

### Page 51 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
DRIP
SHIELD
RBL
18.0  STANDOFF
W1996
FWD
J18
AIR DISTRIBUTION
Lona
STRAP
W1996
STRAP
FWD
A-A
3011378
FIGURE 13: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 7 OF 8)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  Export Controlled ECCN: 9E991  737-30A1081 RB
See page 1 for details  55 of 90

### Page 52

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)(b) -TFE-2XSLEEVING, STAN-
DARD TEFLON
Install (New)1
(c)(d) -TFE-2XSLEEVING, STAN-
DARD TEFLON
Install (New)2
(a) Install sleeving from the floorboard feed-through hole, through the connector cut-out, to the clamp. Refer
to SWPM 20-10-11 as an accepted procedure.
(b) Make sure the grommet is installed within the connector cutout. Refer to SWPM 20-10-11 as an accepted
procedure.
(c) Between air distribution duct clamp and connector D8622P on the J18 Junction Box. Refer to SWPM 20-
10-11 as an accepted procedure.
(d)
Use smallest sleeve size from AWG 0 to 8. Length needed for wire bundles from D8622P connector to
clamp on the Environment Control System (ECS) duct.
FIGURE 13: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 8 OF 8)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
56 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 53 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
W1996
® WHT-  -021-20  21
D8626P
W1992
-022-20-  28
D8636P  D8622P
J18 J-BOX
(WHT/BLK  •I' GD49-AC
GRN  JI GD1229-S
A31  AOA ECH
LEFT
• ADDED WIRE OR NEW ROUTING
+ DELETED WIRE OR FORMER ROUTING
• EXISTING WIRE
> FIND NUMBER  3009818
REFERENCE: 737-300/400/500 WDM 30-31-01
Use wire kit 61-74518-101, 61-74518-2001 and 61-74518-2002.
The find numbers (No.) shown below agree with the find number symbol in the figure.
Find
No.  Name  Identification  Qty  More Data
1  CONNECTOR I.D. TAPE -  61-74518-10101  1  (a)
D08626J
2  CONNECTOR I.D. TAPE -  61-74518-10102  1  (a)
D08626P
FIGURE 14: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE CHANGE
(SHEET 1 OF 2)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  Export Controlled ECCN: 9E991  737-30A1081 RB
See page 1 for details  57 of 90

### Page 54

More DataQtyIdentificationName
Find
No.
(a) 161-74518-10103CONNECTOR I.D. TAPE -
D08636J
3
(a) 161-74518-10104CONNECTOR I.D. TAPE -
D08636P
4
Refer to SWPM 20-30-12 as an
accepted procedure.
148-7191RECEPTACLE VENDOR -
AMPHENOL 1-877-267-
4366
5
Refer to SWPM 20-30-12 as an
accepted procedure.
148-7190PLUG - SUPPLIER - AM-
PHENOL 1-877-267-4366
6
Refer to SWPM 20-61-11 as an
accepted procedure.
2BACC47CP1SCONTACT, SOCKET7
Refer to SWPM 20-30-11 as an
accepted procedure.
1BACT12AR204TERMINAL8
Refer to SWPM 20-30-11 as an
accepted procedure.
1BACT12AR163TERMINAL9
Refer to SWPM 20-30-12 as an
accepted procedure.
2BACC47CP2SCONTACT, SOCKET, SIZE
16
10
Refer to SWPM 20-30-12 as an
accepted procedure.
2BACC47CN2SCONTACT11
Refer to SWPM 20-30-12 as an
accepted procedure.
148-7191-1SPLICE VENDER: AMPHE-
NOL
12
Refer to SWPM 20-30-12 as an
accepted procedure.
148-7190-1SPLICE VENDOR - AM-
PHENOL 1-877-267-4366
13
(b) 161-74518-10105GROUND I.D. TAPE -
GD00049-AC
14
(b) 161-74518-10106GROUND I.D. TAPE -
GD01229-S
15
- 161-74518-101WWIRE LIST16
Refer to SWPM 20-10-11 as an
accepted procedure.
-N0001947 (BMS13-
54GBT1C1FC85/14WH or
BMS13-
54GBT4C1FC60/25WH op-
tional)
POLYESTER, TAPE
Refer to SWPM 20-10-11 as an
accepted procedure.
-NE829RPOLYESTER, TAPE
(a)
Install within 6 inches of the connector. Refer to SWPM 20-10-11 as an accepted procedure.
(b) Install within 6 inches of the terminal. Refer to SWPM 20-10-11 as an accepted procedure.
FIGURE 14: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1996
- WIRE CHANGE
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
58 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 55

FIGURE 15: FLIGHT COMPARTMENT - WIRE BUNDLE W1996 AND SLEEVE - INSTALLATION
(SHEET 1 OF 4)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
59 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 56 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
ANGLE OF AIRFLOW
SENSOR
GD1229-S
W1996
GD49AC
W1996
STA
259.5
STA  W1996
251.6
STA
243.7
UPPER LEFT SIDE
FLIGHT COMPARTMENT
(STA 243.7 TO STA 259.5)
3011193
FIGURE 15: FLIGHT COMPARTMENT - WIRE BUNDLE W1996 AND SLEEVE - INSTALLATION
(SHEET 2 OF 4)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  Export Controlled ECCN: 9E991  737-30A1081 RB
See page 1 for details  60 of 90

### Page 57 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
GD1229-S
(TYPICAL)
GD49AC
(TYPICAL)
3011191
FIGURE 15: FLIGHT COMPARTMENT - WIRE BUNDLE W1996 AND SLEEVE - INSTALLATION
(SHEET 3 OF 4)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  61 of 90

### Page 58

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) -BMS13-52 TYPE III
GRADE C (BMS13-52
TYPE V GRADE A op-
tional)
SLEEVEInstall (New)1
(b) 1-SCREWClean2
(c) Connect the
green wire from the
External Case
Heater (ECH).
1GD1229-S, W1996TERMINALConnect
(c) 1NAS1149D0316HWASHERInstall (New)
(c) Torque to 28 - 35
inch-pounds.
1BACN10YR3CDNUTInstall (New)
(d) --RESISTANCEMeasure3
(e) 1-SCREWClean4
(e) 1-NUTClean
(f) Connect the white
and black wire from
the ECH.
1GD49-AC, W1996TERMINALConnect5
(f) 1NAS1149D0316HWASHERInstall (New)
(f) Torque to 28 - 35
inch-pounds.
1BACN10YR3CDNUTInstall (New)
(d) --RESISTANCEMeasure6
(a)
Install the new sleeve between the ECH and the connectors and between the connectors and the wire
clamp and at breakout of ground wires. Refer to SWPM 20-10-11 as an accepted procedure.
(b) Clean the ground stud screw. Use Cleaning Procedure 5 - Removal of Contamination with Cleaning Solvent.
Refer to SWPM 20-20-00 as an accepted procedure.
(c) Category 1 Unsealed Pre-Installed Ground Stud Assembly per SWPM 20-20-10. Clean the area of the
pre-installed ground stud, the wire bundle terminal, nut, and washer. Use Cleaning Procedure 5 - Removal
of Contamination with Cleaning Solvent. Refer to SWPM 20-20-00 as an accepted procedure.
(d) Measure the resistance between the wire bundle terminal and the structure. Maximum resistance reading
must not exceed 0.001 ohms. Refer to SWPM 20-20-10 as an accepted procedure.
(e) Clean the existing ground stud screw and nut. Use Cleaning Procedure 5 - Removal of Contamination
with Cleaning Solvent. Refer to SWPM 20-20-00 as an accepted procedure.
(f) Clean the wire bundle terminal, nut and washer. Use Cleaning Procedure 5 - Removal of Contamination
with Cleaning Solvent. Refer to SWPM 20-20-00 as an accepted procedure. Category 1 Unsealed Pre-
Installed Ground Stud Assembly per SWPM 20-20-10.
FIGURE 15: FLIGHT COMPARTMENT - WIRE BUNDLE W1996 AND SLEEVE - INSTALLATION
(SHEET 4 OF 4)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: June 26, 2025
737-30A1081 RBRevision 1 April 30, 2026
62 of 90
REQUIREMENTS BULLETIN 737-30A1081
ALERTALERT

### Page 59 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
S.y
- S-5
S-6
MAIN EQUIPMENT  5-7
CENTER
• S-9
- S-10
- S-11
S-12
- S-13
- S-14
W1998  - S-15
- S-16
STA
277
STA
STA 259.5
STA 251.6
243.7
STA
227.8
STA
211.8
STA
STA  196.5
178
UPPER RIGHT HAND CAB  (VIEW LOOKING UP)  3009820
FIGURE 16: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1998
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 1 OF 6)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  Export Controlled ECCN: 9E991  737-30A1081 RB
See page 1 for details  63 of 90

### Page 60 (OCR)

REQUIREMENTS BULLETIN 737-30A1081
ALERT  ALERT
STA
245.7  W1998
CLAMP.
FND
W1998  • ROTATED 180°
FLIGHT COMPARTMENT
FLOOR
(VIEW LOOKING DOWN)
D8628P
GD1225-S  VENDOR
W1998  WIRING M/W
D8628J W1998
W1998
GD35AC
W1998  D8638J
VENDOR
WIRING M/W
D8638P W1998
STA
259.5
STA
251.6
STA  UPPER RIGHT SIDE
243.7  FLIGHT COMPARTMENT
(STA 243.7 TO STA 259.5)
3011399
FIGURE 16: BETWEEN THE FLIGHT COMPARTMENT AND J18 JUNCTION BOX - WIRE BUNDLE W1998
- WIRE ROUTING AND SLEEVING INSTALLATION
(SHEET 2 OF 6)
Original Issue: June 26, 2025
Revision 1 April 30, 2026  737-30A1081 RB
Export Controlled ECCN: 9E991
See page 1 for details  64 of 90

The text continues at https://openairdocs.org/service-documents/boeing/737-30a1081/file/4d6ec92deb1a.md?from=61

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