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Commercial Airplane Group 727 Service Bulletin
SPECIAL ATTENTION Number: 727-34-0245 Date: June 04, 2008 ATA System: 2732 3418 SUBJECT: NAVIGATION - Stall Warning System - Angle of Airflow Sensor Inspection Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 730-774). 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2008 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.
This document includes proprietary information owned by The Boeing Company and/or one or more third parties.
Treatment of the document and the information it contains is governed by contract with Boeing. For more information, contact The Boeing Company, P .O. Box 3707, Seattle, Washington 98124.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, MD-10, MD-11, MD-80, MD-88, MD-90, and the Boeing livery 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.
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
June 04, 2008 727-34-0245 1 of 21
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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
June 04, 2008 727-34-0245 2 of 21 BOEING SERVICE BULLETIN 727-34-0245
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 1 3 B. Concurrent Requirements ...................................... 1 3 C. Reason ................................................ 1 4 D. Description .............................................. 1 4 E. Compliance .............................................. 1 5 F . Approval ............................................... 1 5 G. Manpower .............................................. 1 5 H. Weight and Balance Changes .................................... 1 6 I. Electrical Load Data ......................................... 1 6 J. References .............................................. 1 6
1. Existing Data .......................................... 1 6
2. Data supplied with this Service Bulletin ............................ 1 6
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 1 6 K. Publications Affected ......................................... 1 6 L. Interchangeability and Intermixability of Parts ........................... 1 6
2. MATERIAL INFORMATION ........................................ 1 7 A. Material - Price and Availability ................................... 1 7 B. Industry Support Information .................................... 1 7 C. Parts Necessary For Each Airplane ................................. 1 7
1. Kits/Parts ............................................ 1 7
2. Parts and Materials Supplied by the Operator ........................ 1 7
3. Parts Modified and Reidentified ................................ 1 7
4. Parts Removed and Not Replaced .............................. 1 7 D. Parts Necessary to Change Spares ................................. 1 7 E. Special Tooling - Price and Availability ............................... 1 7 F . Special Tooling Necessary to do this Service Bulletin ....................... 1 8
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 1 9 A. GENERAL INFORMATION ..................................... 1 9 B. WORK INSTRUCTIONS ....................................... 1 9 FIGURE 1: ANGLE OF AIRFLOW SENSOR - INSPECTION ....................... 2 1 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
June 04, 2008 727-34-0245 3 of 21 BOEING SERVICE BULLETIN 727-34-0245
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
June 04, 2008 727-34-0245 4 of 21 BOEING SERVICE BULLETIN 727-34-0245
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Commercial Airplane Group 727 Service Bulletin
SPECIAL ATTENTION SummaryNumber: 727-34-0245Date: June 04, 2008 ATA System: 2732 3418 SUBJECT: NAVIGATION - Stall Warning System - Angle of Airflow Sensor Inspection BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATEL Y .
CONCURRENT REQUIREMENTS None.
BACKGROUND This service bulletin gives instructions for a one-time inspection of Conrac/Ametek/Gulton Angle of Airflow (AOA) sensors with part numbers 2566A21 and 2566A30. This inspection will do a check for a misalignment between the AOA sensor shaft and the sensor synchro transmitter. This misalignment is caused by a defective set screw condition.The airplane could have incorrect control column shaker activation if the inspection given in this service bulletin is not accomplished.
One 747-400 operator reported a control column shaker activation on takeoff. The control column shaker activation continued while the airplane was in flight and EICAS messages ALT DISAGREE and IAS DISAGREE were displayed. The flight crew used the alternative Air Data Computer (left ADC) and the altitude and airspeed indications cancelled. After landing the right ADC was replaced. On the subsequent flight the control column shaker operated again at takeoff and the flight crew had to do a Rejected Takeoff (RTO). Troubleshooting steps found that the right AOA sensor was unserviceable. ADC installed on 727-100/200 airplanes do not use data from the AOA sensor but they do use Conrac/Ametek/Gulton AOA sensors that are equivalent in design and construction to the defective AOA sensor on the 747-400 airplane.
The inspection of the AOA sensor showed that the set screw connected to the synchro transmitter was not correctly attached to the AOA sensor shaft. Accomplishment of this service bulletin will stop incorrect control column shaker activation.
Boeing Service Related Problem (SRP) 727-SRP-34-0114 is related to this service bulletin.
Fleet Team Digest (FTD) 727 FTD 34-07001 is related to this service bulletin.
ACTION Part 1 Do a visual inspection of the AOA sensor. If the AOA sensor is found to be a Conrac/Ametek/Gulton sensor, do Part 2 of the service bulletin.
Part 2 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
June 04, 2008 727-34-0245 5 of 21
Do a test of the AOA sensor. If the AOA sensor fails to activate the control column shaker, do Part 3 of the service bulletin.
Part 3 Do an Aircraft Maintenance Manual (AMM) Operational Test of the Stall Warning System. If the AOA sensor fails to activate the control column shaker, replace the AOA sensor.
NOTE: New part is only necessary if the inspection and tests indicate that the existing sensor must be replaced.
EFFECTIVITY 727/727C/727-100/100C/200/200F Airplanes. Refer to Paragraph 1.A., Effectivity., Airplanes for the list of affected airplanes.
COMPLIANCE Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection or tests given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION None.
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplane Group 727 Service Bulletin
SPECIAL ATTENTION Number: 727-34-0245 Date: June 04, 2008 ATA System: 2732 3418 SUBJECT: NAVIGATION - Stall Warning System - Angle of Airflow Sensor Inspection BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATEL Y .
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index Document D6-9825 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplanes shown below.
DESCRIPTIONCONFIGURATIONGROUP All 727-100 and -200 airplanes that require Angle of Airflow sensor inspection -1 Airplane Models:
727, 727-100, 727-100C, 727-200, 727-200F , 727C GroupVariable Number 1E0001 - E0042 1E0101 - E0140 1E0201 - E0216 1E0301 - E0351 1E0401 - E0423 1E3001 - E3006 1E3011 - E3014 1E3021 - E3040 1E3059 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
June 04, 2008 727-34-0245 9 of 21
GroupVariable Number 1E3061 - E3077 1E3101 - E3103 1E3111 - E3118 1E3141 - E3152 1E3171 - E3177 1E3201 - E3206 1E3221 - E3224 1E3241 - E3290 1E3341 - E3350 1E3401 - E3421 1E3451 - E3452 1E3471 - E3474 1E3501 - E3513 1E3516 - E3523 1E3551 - E3553 1E3571 - E3578 1E3601 - E3604 1E3621 - E3622 1E3651 - E3655 1E3677 1E3681 - E3684 1E3701 - E3704 1E3751 - E3755 1E3781 - E3784 1E5001 - E5011 1E5031 - E5068 1E5101 - E5116 1E5141 - E5143 1E5161 - E5164 1E5201 - E5203 1E5221 - E5245 1E5251 - E5252 1E5271 - E5281 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
June 04, 2008 727-34-0245 10 of 21 BOEING SERVICE BULLETIN 727-34-0245
GroupVariable Number 1E5301 - E5306 1E5351 - E5353 1E5381 - E5382 1E5401 - E5424 1E5426 - E5429 1E5433 1E5435 1E5451 - E5455 1E5481 - E5483 1E5501 - E5502 1QA001 - QA046 1QA051 - QA099 1QA101 - QA199 1QA201 - QA225 1QA301 - QA349 1QA351 - QA376 1QA378 1QA401 - QA499 1QA501 - QA537 1QA551 - QA579 1QA581 - QA585 1QA601 - QA688 1QA701 - QA753 1QA801 - QA805 1QA851 - QA899 1QA901 - QA946 1QA949 1QB001 - QB002 1QB031 - QB049 1QB051 - QB068 1QB101 - QB110 1QB114 - QB119 1QB121 - QB149 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1QB151 - QB158 1QB201 - QB220 1QB301 - QB316 1QB351 - QB352 1QB401 - QB407 1QB451 - QB458 1QB501 - QB575 1QB601 - QB629 1QB651 1QB701 - QB705 1QB801 - QB810 1QB901 - QB904 1QD001 - QD012 1QD031 - QD046 1QD085 - QD088 1QD101 - QD105 1QD121 - QD127 1QD141 - QD149 1QD161 - QD164 1QD191 - QD192 1QD201 - QD239 1QD281 - QD284 1QD301 - QD305 1QD321 - QD330 1QD351 1QD401 - QD403 1QD407 1QD410 1QD421 - QD427 1QD441 - QD453 1QD471 - QD475 1QD501 - QD518 1QD551 - QD558 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
June 04, 2008 727-34-0245 12 of 21 BOEING SERVICE BULLETIN 727-34-0245