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Commercial Airplanes 757 Service Bulletin ALERT Number: 757-34A0611 Original Issue: November 06, 2018 Revision 1: March 22, 2019 ATA System: 3412 SUBJECT: NAVIGATION - Air Data Computing System - Angle Of Attack 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 © 2018 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Unpublished Work.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: November 06, 2018 757-34A0611Revision 1: March 22, 2019 1 of 29
2.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 2 of 29 BOEING SERVICE BULLETIN 757-34A0611
ALERTALERT
BLANK PAGE
Table of Contents
Revision Transmittal Sheet5
Summary7
1. PLANNING INFORMATION11
A. Effectivity11
1. Airplanes11
2. Spares Affected14
B. Concurrent Requirements14
C. Reason15
D. Description15
E. Compliance16
F. Approval17
G. Manpower17
H. Weight and Balance Changes18
I. Electrical Load Data19
J. References19
1. Existing Data:19
2. Data Supplied with this Service Bulletin:19
3. Installation Drawings Used in the Preparation of this Service Bulletin:19
K. Publications Affected19
L. Interchangeability and Intermixability of Parts20
M. Software Accomplishment Summary20
2. MATERIAL INFORMATION21
A. Material - Price and Availability21
B. Industry Support Information21
C. Parts Necessary for Each Airplane21
1. Kits/Parts21
2. Parts and Materials Supplied by the Operator21
3. Parts Modified and Reidentified22
4. Parts Removed and Not Replaced22
D. Parts Necessary to Change Spares22
E. Special Tooling - Price and Availability22
F. Special Tooling Necessary to do this Service Bulletin22
3. ACCOMPLISHMENT INSTRUCTIONS23
A. GENERAL INFORMATION23
B. WORK INSTRUCTIONS24
FIGURE 1: AREA OUTBOARD AND ABOVE NOSE LANDING GEAR WHEEL WELL - INSPECT LEFT
ANGLE OF ATTACK SENSOR - SLINGER26
FIGURE 2: AREA OUTBOARD AND ABOVE NOSE LANDING GEAR WHEEL WELL - INSPECT RIGHT
ANGLE OF ATTACK SENSOR - SLINGER27
FIGURE 3: AREA OUTBOARD AND ABOVE NOSE LANDING GEAR WHEEL WELL - INSPECT LEFT
ANGLE OF ATTACK SENSOR - PART NUMBER28
FIGURE 4: AREA OUTBOARD AND ABOVE NOSE LANDING GEAR WHEEL WELL - INSPECT RIGHT
ANGLE OF ATTACK SENSOR - PART NUMBER29
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 3 of 29 BOEING SERVICE BULLETIN 757-34A0611
ALERTALERT
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 4 of 29 BOEING SERVICE BULLETIN 757-34A0611
ALERTALERT
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Commercial Airplanes 757 Service Bulletin ALERT Revision Transmittal SheetNumber: 757-34A0611Original Issue: November 06, 2018 Revision 1: March 22, 2019 ATA System: 3412 SUBJECT: NAVIGATION - Air Data Computing System - Angle Of Attack Sensor Inspection and Replacement This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION The Federal Aviation Administration (FAA) will possibly release an additional Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
Effects of this Revision on airplanes on which Original Issue was previously done:
None.
REASON FOR REVISION This revision is sent to correct the part number of the gasket in the Parts and Materials Supplied by the Operator table.
These sections were changed:
1. In Paragraph 1.C., Reason, added revision and Information Notice statements.
2. In Paragraph 1.D., Description, added revision statement.
3. In Paragraph 1.K.1., Publications, added publication reference.
4. In Paragraph 2.C.2., Parts and Materials Supplied by the Operator, changed the gasket part number.
The data given in Information Notice 757-34A0611 IN 01 is included in this revision.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity and format changes, to show the location of all content changes.
Pages with no vertical lines have no changes.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 5 of 29
REVISION HISTORY November 06, 2018Original Issue:
March 22, 2019Revision 1:
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 6 of 29 BOEING SERVICE BULLETIN 757-34A0611
ALERTALERT
Commercial Airplanes 757 Service Bulletin ALERT SummaryNumber: 757-34A0611Original Issue: November 06, 2018 Revision 1: March 22, 2019 ATA System: 3412 SUBJECT: NAVIGATION - Air Data Computing System - Angle Of Attack 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 Attack (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 during takeoff. If this service bulletin is not done AOA sensors can freeze and become immobilized, which can lead to an unrecoverable Stall at Low Altitude, which can result in unsafe flight conditions.
This service bulletin gives instructions to inspect the left and right AOA sensor part numbers. 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) 757-SRP-34-0141 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 757 FTD 34-15001 is related to this service bulletin.
Boeing Service Letter (SL) 757-SL-34-126-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 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 7 of 29
ReferenceAffectedPlanning Data Paragraph 1.E., ComplianceYesAD Related Paragraph 1.H., Weight and Balance ChangesNoWeight 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 At the area outboard and above the nose landing gear wheel well, do the following:
1. Inspect the left and right AOA sensor.
2. If an AOA sensor has an incorrect part number, replace it with a new or serviceable AOA sensor.
3. If an AOA sensor has a correct part number, no AOA sensor replacement is required.
EFFECTIVITY 757-200, 757-200CB, 757-200PF and 757-300 Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
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 configuration changes given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 8 of 29 BOEING SERVICE BULLETIN 757-34A0611
ALERTALERT
BOEING SERVICE BULLETIN 757-34A0611
ALERT ALERT Refer to Paragraph 2.A., Material - Price and Availability.
00 AT THE AREA OUTBOARD AND ABOVE NOSE LANDING GEAR WHEEL WELL:
- INSPECT THE LEFT AND RIGHT ANGLE OF ATTACK SENSORS
- REPLACE THE ANGLE OF ATTACK SENSORS IF IT IS AN INCORRECT PART NUMBER (LEFT SIDE SHOWN, RIGHT SIDE OPPOSITE) 2830394
ANGLE OF ATTACK SENSOR Original Issue: November 06, 2018 Revision 1: March 22, 2019 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 757-34A0611 Work - See page 1 for details. 9 of 29
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 10 of 29 BOEING SERVICE BULLETIN 757-34A0611
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Commercial Airplanes 757 Service Bulletin ALERT Number: 757-34A0611 Original Issue: November 06, 2018 Revision 1: March 22, 2019 ATA System: 3412 SUBJECT: NAVIGATION - Air Data Computing System - Angle Of Attack 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 Refer to Service Bulletin Index D624N001 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This bulletin is applicable to 757-200, 757-200CB, 757-200PF, 757-300 Airplane(s), line number(s) 1-965 in 1 Group(s).
The Variable Numbers and Group Information for the applicable airplanes is given below.
DESCRIPTIONCONFIGURATIONGROUP Airplanes that require inspection of the left and right Angle of Attack (AOA) sensors and replacement of the AOA sensors as necessary.
-1 Airplane Models:
757-200, 757-200CB, 757-200PF, 757-300 GroupVariable Number 1NA001 - NA028 1NA191 - NA199 1NA201 - NA239 1NA301 - NA305 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 11 of 29
GroupVariable Number 1NA341 - NA352 1NA391 - NA399 1NA401 - NA408 1NA441 - NA447 1NA501 - NA586 1NB001 - NB004 1NB021 - NB023 1NB036 - NB041 1NB051 - NB053 1NB061 - NB073 1NB079 1NB131 - NB148 1NB161 - NB162 1NB166 - NB168 1NB201 - NB204 1NB221 - NB228 1NB230 1NB236 1NB239 1NB261 - NB267 1NB291 - NB299 1NB301 - NB302 1NB311 - NB312 1NB321 - NB331 1NB421 - NB438 1NB446 1NB451 - NB454 1NB501 - NB523 1NB561 1NB571 1NB581 - NB583 1NC001 - NC033 1NC041 - NC042 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: November 06, 2018 757-34A0611Revision 1: March 22, 2019 12 of 29 BOEING SERVICE BULLETIN 757-34A0611