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Commercial Airplanes 727 Service Bulletin ALERT Number: 727-34A0247 Original Issue: January 02, 2019 ATA System: 3418 SUBJECT: NAVIGATION - 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:
Copyright © 2019 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Unpublished Work.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: January 02, 2019 727-34A0247 1 of 44
2.0
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected14
B. Concurrent Requirements14
C. Reason15
D. Description15
E. Compliance16
F. Approval17
G. Manpower17
H. Weight and Balance Changes20
I. Electrical Load Data21
J. References21
1. Existing Data:21
2. Data Supplied with this Service Bulletin:21
3. Installation Drawings Used in the Preparation of this Service Bulletin:21
K. Publications Affected21
L. Interchangeability and Intermixability of Parts22
M. Software Accomplishment Summary22
2. MATERIAL INFORMATION23
A. Material - Price and Availability23
B. Industry Support Information23
C. Parts Necessary for Each Airplane23
1. Kits/Parts23
2. Parts and Materials Supplied by the Operator23
3. Parts Modified and Reidentified27
4. Parts Removed and Not Replaced27
D. Parts Necessary to Change Spares27
E. Special Tooling - Price and Availability27
F. Special Tooling Necessary to do this Service Bulletin27
3. ACCOMPLISHMENT INSTRUCTIONS29
A. GENERAL INFORMATION29
B. WORK INSTRUCTIONS30
FIGURE 1: STA 290.42 ON THE LEFT SIDE OF THE AIRPLANE - ANGLE OF AIRFLOW SENSOR - VANE
INSPECTION [Group 1-4, 7]37
FIGURE 2: STA 290.42 ON THE RIGHT SIDE OF THE AIRPLANE - ANGLE OF AIRFLOW SENSOR -
VANE INSPECTION [Group 1-6]39
FIGURE 3: STA 290.42 ON THE LEFT SIDE OF THE AIRPLANE - ANGLE OF AIRFLOW SENSOR -
INSPECTION FOR PART NUMBER [Group 1-4, 7]41
FIGURE 4: STA 290.42 ON THE RIGHT SIDE OF THE AIRPLANE - ANGLE OF AIRFLOW SENSOR -
INSPECTION FOR PART NUMBER [Group 1-6]43
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplanes 727 Service Bulletin ALERT SummaryNumber: 727-34A0247Original Issue: January 02, 2019 ATA System: 3418 SUBJECT: NAVIGATION - 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 while the airplane is 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 had become immobilized because the heaters in the AOA sensor were not sufficient to prevent ice build-up in the faceplate and vane. This can be caused during heavy moisture conditions leading to water entering the AOA vane pivot and freezing prior to or during flight. If this service bulletin is not done AOA sensors can freeze and become immobilized, which can result in no stick shaker on the affected side. If the flight crew allows the airplane to stall at low altitude, the airplane may become unrecoverable.
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 faceplate and vane. Installation of new or serviceable AOA sensor(s) prevents immobilization of the AOA sensor vane because of ice build-up.
Boeing Service Related Problem (SRP) 727-SRP-34-0141 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 727 FTD 34-15001 is related to this service bulletin.
Boeing Service Letter (SL) 727-SL-34-030-D is related to this service bulletin.
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 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 02, 2019 727-34A0247 5 of 44
ReferenceAffectedPlanning Data 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 NoSpecial Tooling Required ACTION Group 1-4:
At STA 290.42 on the left and right side of the airplane, inspect the AOA sensors. If an AOA sensor has an incorrect part number, replace it with a new or serviceable AOA sensor. If an AOA sensor has a correct part number, no AOA sensor replacement is required.
Group 5-6:
At STA 290.42 on the right side of the airplane, inspect the AOA sensor. If an AOA sensor has an incorrect part number, replace it with a new or serviceable AOA sensor. If an AOA sensor has a correct part number, no AOA sensor replacement is required.
Group 7:
At STA 290.42 on the left side of the airplane, inspect the AOA sensor. If an AOA sensor has an incorrect part number, replace it with a new or serviceable AOA sensor. If an AOA sensor has a correct part number, no AOA sensor replacement is required.
EFFECTIVITY 727, 727-100, 727-100C, 727-200, 727-200F, 727C Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
COMPLIANCE Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
GROUP 1-4:
AT STA 290.42 ON THE LEFT AND RIGHT SIDE OF THE AIRPLANE -INSPECT THE LEFT AND RIGHT ANGLE OF AIRFLOW SENSORS
- REPLACE THE ANGLE OF AIRFLOW SENSORS IF IT IS AN INCORRECT PART NUMBER GROUP 5,6:
AT STA 290.42 ON THE RIGHT SIDE OF THE AIRPLANE
- INSPECT THE RIGHT ANGLE OF AIRFLOW SENSOR
- REPLACE THE ANGLE OF AIRFLOW SENSOR IF IT IS AN INCORRECT PART NUMBER GROUP 7:
AT STA 290.42 ON THE LEFT SIDE OF THE AIRPLANE
- INSPECT THE LEFT ANGLE OF AIRFLOW SENSOR
- REPLACE THE ANGLE OF AIRFLOW SENSOR IF IT IS AN INCORRECT PART NUMBER ANGLE OF AIRFLOW SENSOR 2848470 (RIGHT SIDE SHOWN, LEFT SIDE OPPOSITE) Original Issue: January 02, 2019 Export Controlled ECCN: 9E991 727-34A0247 Copyright © Unpublished Work - See page 1 for details. 7 of 44
Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplanes 727 Service Bulletin ALERT Number: 727-34A0247 Original Issue: January 02, 2019 ATA System: 3418 SUBJECT: NAVIGATION - 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 727, 727-100, 727-100C, 727-200, 727-200F, 727C Airplane(s), line number(s) 1-1133, 1135-1141, 1143-1145, 1147-1405, 1407-1413, 1415-1656, 1658-1801, 1803-1832 in 7 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 D6-9825 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
The Variable Numbers and Group Information for the applicable airplanes is given below.
DESCRIPTIONCONFIGURATIONGROUP Airplanes with Angle of Airflow sensors installed on the left and right side of the airplane that must be part number 2566A-21 or 2566A-30.
-1 Airplanes with Angle of Airflow sensors installed on the left side of the airplane that must be part number 2566A-21 or 2566A-30 and on the right side of the airplane that must be part number 2566A-30.
-2 Airplanes with Angle of Airflow sensors installed on the left side of the airplane that must be part number 2566A-30 and on the right side of the airplane that must be part number 2566A-21 or 2566A-30.
-3 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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DESCRIPTIONCONFIGURATIONGROUP Airplanes with Angle of Airflow sensors installed on the left and right side of the airplane that must be part number 2566A-30.
-4 Airplanes with an Angle of Airflow sensor installed on the right side of the airplane that must be part number 2566A-21 or 2566A-30.
-5 Airplanes with an Angle of Airflow sensor installed on the right side of the airplane that must be part number 2566A-30.
-6 Airplanes with an Angle of Airflow sensor installed on the left side of the airplane that must be part number 2566A-21 or 2566A-30.
-7 Airplane Models:
727, 727-100, 727-100C, 727-200, 727-200F, 727C GroupVariable Number 1E0001 - E0042 2E0101 - E0140 2E0201 - E0213 1E0214 - E0216 1E0301 - E0351 1E0401 - E0423 2E3001 - E3006 2E3011 - E3014 2E3021 - E3040 2E3059 2E3061 - E3077 2E3101 - E3103 2E3111 - E3118 2E3141 - E3143 4E3144 - E3147 2E3148 4E3149 2E3150 - E3152 2E3171 - E3177 2E3201 - E3206 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 2E3221 - E3224 2E3241 - E3290 2E3341 - E3350 2E3401 - E3421 2E3451 - E3452 2E3471 - E3474 2E3501 - E3513 2E3516 - E3523 2E3551 - E3553 1E3571 - E3578 2E3601 - E3604 2E3621 - E3622 2E3651 - E3655 2E3677 2E3681 - E3684 2E3701 - E3704 2E3751 - E3755 2E3781 - E3784 2E5001 - E5011 2E5031 - E5068 2E5101 - E5116 2E5141 - E5143 2E5161 - E5164 2E5201 - E5203 2E5221 - E5245 2E5251 - E5252 2E5271 - E5281 2E5301 - E5306 2E5351 - E5353 2E5381 - E5382 2E5401 - E5424 2E5426 - E5429 2E5433 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 2E5435 2E5451 - E5455 2E5481 - E5483 2E5501 - E5502 5QA001 - QA018 6QA019 - QA021 5QA022 - QA046 5QA051 - QA099 5QA101 - QA196 6QA197 5QA198 - QA199 5QA201 - QA225 5QA301 - QA349 5QA351 - QA376 5QA378 2QA401 - QA499 5QA501 - QA537 5QA551 - QA579 5QA581 - QA585 6QA601 - QA688 6QA701 - QA753 5QA801 - QA805 5QA851 - QA899 5QA901 - QA946 5QA949 6QB001 - QB002 5QB031 - QB049 5QB051 - QB064 5QB066 - QB068 5QB101 - QB110 5QB114 - QB119 6QB121 - QB149 6QB151 - QB158 Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details.
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