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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-27A1324 Original Issue: March 02, 2021 ATA System: 2732 SUBJECT: FLIGHT CONTROL - Stall Warning System - Angle of Airflow Sensor Inspection and Replacement Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 300-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2021 Boeing.
Unpublished Work. All Rights Reserved.
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The Boeing Company.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and Boeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing.
Original Issue: March 02, 2021 737-27A1324 1 of 29
2.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 2 of 29 BOEING SERVICE BULLETIN 737-27A1324
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Table of Contents
S u m m a r y5
1. PLANNING INFORMATION9
A . E f f e c t i v i t y9
1. Airplanes9
2 . S p a r e s A f f e c t e d ........................................ 1 2 B. Concurrent Requirements ...................................... 1 2 C. Reason ................................................ 1 2 D. Description .............................................. 1 3 E. Compliance .............................................. 1 4 F . A p p r o v a l ............................................... 1 5 G. Manpower .............................................. 1 6 H. Weight and Balance Changes .................................... 1 7 I. Electrical Load Data ......................................... 1 7 J . R e f e r e n c e s .............................................. 1 7
1. Existing Data: ......................................... 1 7
2. Data Supplied with this Service Bulletin: ........................... 1 8
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 8 K. Publications Affected ........................................ 1 8 L. Interchangeability and Intermixability of Parts ........................... 1 8 M. Software Accomplishment Summary ................................ 1 8
2. MATERIAL INFORMATION ........................................ 1 9 A. Material - Price and Availability ................................... 1 9 B. Industry Support Information .................................... 1 9 C. Parts Necessary for Each Airplane ................................. 1 9 1 . K i t s / P a r t s ............................................ 1 9
2. Parts and Materials Supplied by the Operator ........................ 1 9
3. Parts Modified and Reidentified ................................ 2 1
4. Parts Removed and Not Replaced .............................. 2 1 D. Parts Necessary to Change Spares ................................. 2 2 E. Special Tooling - Price and Availability ............................... 2 2 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 2
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 3 A. GENERAL INFORMATION ..................................... 2 3 B. WORK INSTRUCTIONS ....................................... 2 4 FIGURE 1: STA 247.70 ANGLE OF AIRFLOW SENSOR - INSPECTION OF LEFT SENSOR ..... 2 6 FIGURE 2: STA 247.70 ANGLE OF AIRFLOW SENSOR - INSPECTION OF RIGHT SENSOR .... 2 8 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 3 of 29 BOEING SERVICE BULLETIN 737-27A1324
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 4 of 29 BOEING SERVICE BULLETIN 737-27A1324
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-27A1324Original Issue: March 02, 2021 ATA System: 2732 SUBJECT: FLIGHT CONTROL - Stall Warning System - Angle of Airflow Sensor Inspection and Replacement
THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER.
CONCURRENT REQUIREMENTS None.
BACKGROUND Boeing has received reports from operators of nuisance stick shaker activation on a non 737CL model while the airplane was accelerating to cruise speed at the top of a climb. A review of recorded flight data and weather reports indicated that the cause of the nuisance stick shakers was that the Angle of Airflow (AOA) sensor vanes were frozen and malfunctioned due to insufficient heat in certain AOA sensors to prevent ice build-up in the vane pivot. This condition can be caused by heavy moisture conditions on ground leading to water entering the AOA vane pivot and freezing prior to or during flight. Boeing has determined that the potential for vane pivot freezing exists with certain AOA sensor part numbers used on the 737-200 model. If this service bulletin is not done, AOA sensors can freeze and malfunction, which can result in failure of the stall warning system and potential impact to Continued Safe Flight and Landing (CSFL).
This service bulletin gives instructions to inspect the AOA sensor(s) installed on the airplane. Also, instructions are given to replace existing AOA sensors that have heaters that are not sufficient to prevent ice build-up in the vane pivot. Installation of new or serviceable AOA sensor(s) prevents failure of the stall warning system and potential impact to CSFL.
Boeing Service Related Problem (SRP) 737-100/200/300/400/500-SRP-34-0141 is related to this service bulletin.
Boeing Service Related Problem (SRP) 737-100/200/300/400/500-SRP-34-0179 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 737-100/200/300/400/500 FTD 34-15002 is related to this service bulletin.
Boeing Service Letter (SL) 737-SL-34-152-D is related to this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 5 of 29
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., ComplianceYesAD Related Paragraph 1.H., Weight and Balance ChangesYesWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedYesPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsNoKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator YesOperator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin YesSpecial Tooling Required ACTION Group 1, Configuration 1:
At STA 247.70 on the left and right side of the airplane, inspect the AOA sensor to determine part number. If the AOA sensor has a swept back shape vane or has incorrect part number, replace affected AOA sensor with correct new or serviceable AOA sensor part number. If the AOA sensor has a rectangular flag shape vane or has a correct part number, no further action is required.
Group 1, Configuration 2:
At STA 247.70 on the left side of the airplane, inspect the AOA sensor to determine part number. If the AOA sensor has a swept back shape vane or has incorrect part number, replace AOA sensor with correct new or serviceable AOA sensor part number. If the AOA sensor has a rectangular flag shape vane or has a correct part number, no further action is required.
Group 2:
Boeing endorses the FAA rules related to Limit of Validity (LOV) and recommends immediate and permanent removal from service of any airplanes upon reaching the LOV, whether or not it is operated under FAA jurisdiction.
As such, Boeing no longer provides maintenance instructions for airplanes that have accumulated flight cycles beyond the LOV. Airplanes in Group 2 (737-200/-200C Airplanes, line numbers 44-286 inclusive) have accumulated flight cycles beyond the LOV of the maintenance program. 14 CFR 121.1115 and 129.115 prohibit operation of an airplane beyond its LOV.
EFFECTIVITY 737-200 and 737-200C Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 6 of 29 BOEING SERVICE BULLETIN 737-27A1324
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COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection procedures and configuration changes given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 7 of 29 BOEING SERVICE BULLETIN 737-27A1324
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BOEING SERVICE BULLETIN 737-27A1324
ALERT ALERT A OR B GROUP 1 CONFIGURATION 1:
AT STA 247.70 ON THE LEFT AND RIGHT SIDE OF THE AIRPLANE -INSPECT THE AOA SENSORS TO DETERMINE PART NUMBER.
-IF THE AOA SENSOR HAS A SWEPT BACK SHAPE VANE OR HAS INCORRECT PART NUMBER, REPLACE AFFECTED AOA SENSOR WITH NEW OR SERVICEABLE AOA SENSOR PART NUMBER.
- IF THE AOA SENSOR HAS A RECTANGLULAR FLAG SHAPE VANE OR HAS A CORRECT PART
NUMBER, NO FURTHER ACTION IS REQUIRED, GROUP 1 CONFIGURATION2:
AT STA 274.70 ON THE LEFT SIDE OF THE AIRPLANE
- INSPECT THE AOA SENSOR TO DETERMINE PART NUMBER -IF TH AOA SENSOR HAS A SWEPT BACK SHAPE VANE OR INCORRECT PART NUMBER.
REPLACE AOA SENSOR WITH NEW OR SERVICEABLE AOA SENSOR PART NUMBER.
- IF THE AOA SENSOR HAS A RECTANGULAR FLAG SHAPE VANE OR HAS A CORRECT PART NUMBER, NO FURTHER ACTION IS REQUIRED.
ANGLE OF AIRFLOW SENSOR 2956420 (RIGHT SIDE SHOWN, LEFT SIDE OPPOSITE) Original Issue: March 02, 2021 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished 737-27A1324 Work - See page 1 for details. 8 of 29
Commercial Airplanes 737 Service Bulletin ALERT Number: 737-27A1324 Original Issue: March 02, 2021 ATA System: 2732 SUBJECT: FLIGHT CONTROL - Stall Warning System - Angle of Airflow Sensor Inspection and Replacement
THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER.
1. PLANNING INFORMATION A. Effectivity
1. Airplanes This bulletin is applicable to 737-200, 737-200C Airplane(s), line number(s) 44, 102, 126, 139, 146, 149-150, 159, 162, 166, 172, 204, 207-208, 211, 221, 225-226, 242, 245, 254, 273-276, 283, 286, 295, 298-299, 303-304, 308-309, 314, 320-321, 326, 336, 338, 344-345, 349-350, 354-356, 359, 362-363, 366, 368, 371, 384, 404, 408, 411, 415, 422, 424, 427, 436-437, 442, 447, 458, 466, 468-469, 477, 483, 485, 488-489, 501-502, 507, 511-515, 522-523, 529-532, 535, 537, 539, 541, 546, 548, 555, 557-558, 560, 563, 565, 570, 572-573, 576-577, 579, 584, 588, 595, 597-600, 603, 605, 608, 610-611, 616, 618, 620-623, 627, 629, 632, 635-636, 640-644, 650-651, 655, 658, 660-661, 668-670, 672-673, 681-682, 686, 688-689, 694, 696, 699, 701, 706-708, 712-715, 718, 720-721, 726-727, 729, 731, 734, 736, 739, 741, 744-745, 747, 749-750, 752, 754, 760, 762-765, 769, 771-772, 781, 785-786, 789, 792-793, 795, 797-799, 801, 803, 805, 807-810, 812-813, 816, 820-822, 828-829, 831, 833-837, 839, 843, 845-847, 849, 851, 854, 856, 862-863, 867-868, 870-871, 877, 880, 883, 886, 891-892, 896, 899, 901-903, 905, 907, 910, 912, 914, 916, 923-924, 927-928, 932, 936, 938, 943, 946-947, 949-951, 953-955, 960-961, 963, 965-967, 969, 975-977, 981-983, 985, 987, 989, 992, 994, 996, 998, 1008-1009, 1011-1013, 1017-1020, 1023-1024, 1028-1029, 1031, 1033, 1035-1036, 1039-1040, 1042, 1046-1047, 1049, 1053, 1056, 1058-1059, 1061-1062, 1066, 1070-1071, 1075, 1077-1078, 1081-1082, 1089, 1091, 1093, 1095, 1097, 1099, 1102, 1113, 1117, 1154, 1178, 1189, 1197, 1226, 1236, 1241, 1257, 1261-1262, 1265, 1299, 1313, 1369, 1371, 1379, 1387, 1392, 1399, 1401, 1403, 1405, 1414, 1418, 1420, 1486, 1565, 1581, 1583, 1585 in 2 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.
Refer to Service Bulletin Index D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 9 of 29
The Variable Numbers and Group Information for the applicable airplanes is given below.
DESCRIPTIONCONFIGURATIONGROUP Airplanes with Angle of Airflow (AOA) sensors installed.-1 Airplanes with AOA sensors installed on the left and right side of the airplane.
1 Airplanes with an AOA sensor installed on the left side of the airplane.2 737-200/-200C Airplanes, line numbers 44-286 inclusive, beyond the Limit of Validity (LOV) -2 Airplane Models:
737-200, 737-200C GroupVariable Number 2PG055 2PG057 2PG075 2PG203 2PG219 2PG308 2PG310 - PG311 2PG375 2PG651 - PG652 2PH712 - PH713 2PH731 1PJ003 1PJ007 - PJ009 2PJ032 2PJ102 - PJ103 1PJ107 1PJ111 - PJ112 1PJ114 - PJ115 1PJ117 1PJ202 GroupVariable Number 1PJ206 1PJ211 1PJ213 - PJ215 1PJ217 - PJ219 1PK029 1PK051 1PK070 1PK112 1PK144 1PK202 - PK203 1PK213 1PK215 1PK217 1PK219 1PK238 - PK240 1PK257 - PK258 1PK274 1PK282 1PK312 - PK318 1PK357 - PK358 GroupVariable Number 1PK391 1PK431 1PK451 1PK495 1PK501 1PK503 1PK511 1PK524 - PK528 1PK548 1PK552 1PK558 1PK561 1PK565 1PK593 1PK598 1PK601 1PK604 - PK606 1PK609 1PK611 - PK613 1PK615 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 10 of 29 BOEING SERVICE BULLETIN 737-27A1324
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GroupVariable Number 1PK617 1PK623 - PK624 1PK627 1PK632 1PK635 1PK641 - PK642 1PK664 1PK666 1PK671 1PK673 1PK677 1PK715 1PK731 1PK734 - PK735 1PK739 - PK743 1PK745 1PK747 1PK749 - PK751 1PK753 - PK754 1PK759 - PK760 1PK763 - PK764 1PK771 1PK801 - PK804 1PK821 - PK823 1PK826 - PK827 1PK830 1PK872 1PK903 - PK904 1PK907 - PK913 1PK915 - PK921 1PK923 1PK928 - PK930 1PK933 - PK934 GroupVariable Number 1PK936 1PK938 1PK971 1PK973 1PL001 1PL004 1PL008 1PL010 - PL011 1PL017 - PL019 1PL023 1PL026 1PL028 1PL081 1PL103 - PL111 1PL151 1PL202 1PL401 1PL403 1PL405 1PL408 1PL410 - PL411 1PL417 1PL441 1PL456 1PL471 1PL501 1PL503 1PL505 - PL506 1PL553 - PL555 1PL558 1PL560 1PL581 1PL601 - PL603 GroupVariable Number 1PL611 1PL621 - PL625 1PL631 1PL727 - PL730 1PL732 - PL733 1PL737 1PL741 1PL745 1PL768 1PL770 1PL793 2PL803 1PM001 - PM006 1PM016 - PM017 1PM051 1PM054 1PM061 1PM065 - PM066 1PM101 1PM103 1PM106 1PM108 - PM113 1PM115 - PM116 1PM119 1PM142 1PM252 1PM281 - PM283 1PN023 1PN028 1PN030 1PN032 1PN037 1PN039 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 11 of 29 BOEING SERVICE BULLETIN 737-27A1324
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GroupVariable Number 1PN041 1PN082 1PN086 1PN102 1PN106 1PN133 1PN135 1PN141 - PN148 1PN150 - PN151 1PN154 - PN157 1PN162 1PN401 1PN403 - PN405 1PN407 - PN410 1PN415 - PN420 1PN431 - PN432 1PN452 - PN453 1PN455 1PN472 1PN474 1PN491 GroupVariable Number 1PN493 1PN501 1PN512 1PN521 2PX701 2PY002 2PY004 2PY021 1PY022 1PY037 1PY046 - PY047 1PY056 - PY057 1PY101 1PY103 1PY131 1PY135 1PY141 - PY142 1PY151 1PY153 - PY154 1PY162 1PY166 GroupVariable Number 1PY191 1PY201 1PY241 - PY244 1PY270 1PY274 - PY275 1PY281 2PY303 2PY322 2PY345 - PY346 2PY361 1PY410 1PY422 1PY441 1PY461 1PY592 - PY595 1PY611 - PY612 1PY631 1PY671 - PY672 1PY741 -- --
2. Spares Affected None.
B. Concurrent Requirements None.
C. Reason Boeing has received reports from operators of nuisance stick shaker activation on a non 737CL model while the airplane was accelerating to cruise speed at the top of a climb. A review of recorded flight data and weather reports indicated that the cause of the nuisance stick shakers was that the Angle of Airflow (AOA) sensor vanes were frozen and malfunctioned due to insufficient heat in certain AOA sensors to prevent ice build-up in the vane pivot. This condition can be caused by heavy moisture Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: March 02, 2021 737-27A1324 12 of 29 BOEING SERVICE BULLETIN 737-27A1324