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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
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
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
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
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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
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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 See page 1 for details Original Issue: June 26, 2025 737-30A1081 RBRevision 1: April 30, 2026 10 of 90 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 See page 1 for details Original Issue: June 26, 2025 737-30A1081 RBRevision 1: April 30, 2026 11 of 90 REQUIREMENTS BULLETIN 737-30A1081
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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 Automation Wire Provisions Installation 737-30-1068 Revision 1Boeing EQUIPMENT/FURNISHINGS - Flight Compartment/Passenger Compartment/Cargo Compartment/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 Automation 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 See page 1 for details Original Issue: June 26, 2025 737-30A1081 RBRevision 1: April 30, 2026 12 of 90 REQUIREMENTS BULLETIN 737-30A1081
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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
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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 repeat 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 See page 1 for details Original Issue: June 26, 2025 737-30A1081 RBRevision 1: April 30, 2026 14 of 90 REQUIREMENTS BULLETIN 737-30A1081
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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 See page 1 for details Original Issue: June 26, 2025 737-30A1081 RBRevision 1: April 30, 2026 15 of 90 REQUIREMENTS BULLETIN 737-30A1081
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Export Controlled ECCN: 9E991 See page 1 for details Original Issue: June 26, 2025 737-30A1081 RBRevision 1: April 30, 2026 16 of 90 REQUIREMENTS BULLETIN 737-30A1081