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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-27A1302 Original Issue: April 24, 2012 ATA System: 2731 SUBJECT: FLIGHT CONTROLS - Elevator Tab Control Mechanism Detailed 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2012 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon 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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: April 24, 2012 737-27A1302 1 of 44
3.0
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Original Issue: April 24, 2012 737-27A1302 2 of 44 BOEING SERVICE BULLETIN 737-27A1302
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 1 4 B. Concurrent Requirements ...................................... 1 4 C. Reason ................................................ 1 4 D. Description .............................................. 1 4 E. Compliance .............................................. 1 5 F. Approval ............................................... 1 6 G. Manpower .............................................. 1 6 H. Weight and Balance Changes .................................... 1 8 I. Electrical Load Data ......................................... 1 8 J. References .............................................. 1 8
1. Existing Data .......................................... 1 8
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 9
2. MATERIAL INFORMATION ........................................ 2 1 A. Material - Price and Availability ................................... 2 1 B. Industry Support Information .................................... 2 1 C. Parts Necessary For Each Airplane ................................. 2 1
1. Kits/Parts ............................................ 2 1
2. Parts and Materials Supplied by the Operator ........................ 2 1
3. Parts Modified and Reidentified ................................ 2 1
4. Parts Removed and Not Replaced .............................. 2 1 D. Parts Necessary to Change Spares ................................. 2 1 E. Special Tooling - Price and Availability ............................... 2 1 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 1
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 3 A. GENERAL INFORMATION ..................................... 2 3 B. WORK INSTRUCTIONS ....................................... 2 4 FIGURE 1: AFT ATTACH LUG DETAILED INSPECTION - INBOARD LUG - LEFT SIDE ....... 2 9 FIGURE 2: AFT ATTACH LUG DETAILED INSPECTION - OUTBOARD LUG - LEFT SIDE ...... 3 3 FIGURE 3: AFT ATTACH LUG DETAILED INSPECTION - INBOARD LUG - RIGHT SIDE ...... 3 7 FIGURE 4: AFT ATTACH LUG DETAILED INSPECTION - OUTBOARD LUG - RIGHT SIDE ..... 4 1
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Original Issue: April 24, 2012 737-27A1302 3 of 44 BOEING SERVICE BULLETIN 737-27A1302
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Original Issue: April 24, 2012 737-27A1302 4 of 44 BOEING SERVICE BULLETIN 737-27A1302
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-27A1302Original Issue: April 24, 2012 ATA System: 2731 SUBJECT: FLIGHT CONTROLS - Elevator Tab Control Mechanism Detailed Inspection
THIS BULLETIN 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 SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
CONCURRENT REQUIREMENTS None.
BACKGROUND Boeing previously received a report from an 737NG operator where the failure of the aft attach lugs on the left elevator tab control mechanism resulted in unwanted elevator freeplay vibration during flight. Investigation revealed that the fractured aft attach lugs on the elevator tab control mechanism allowed freeplay of the mechanism, which led to vibration of the elevator during flight. Further investigation revealed that the bearings installed in the elevator tab control mechanism aft attach lugs were likely insufficiently swaged and became loose. 737NG service bulletin 737-27A1297 was issued to do a detailed inspection for looseness of these bearings. This service bulletin does inspection of these bearings for looseness similar to the inspections in 737-27A1297. Although the previously mentioned incident occurred on a 737NG, the design of the bearing lug retention is essentially the same as newer 737-200's which all have the 65-45190-7 & -8 Tab Control Mechanism installation. A loose bearing in the aft lug of the elevator tab control mechanism could lead to unwanted elevator tab freeplay and then tab vibration which could lead to structural failure of the elevator or the horizontal stabilizer which can result in unsafe flight conditions.
This bulletin will ensure the integrity of bearing swages, whether performed in production or during any subsequent maintenance work done by an airline. This inspection was determined to be needed for the 737-200 because the design of the 737-200 bearing retention is essentially the same as for the 737NG. The 737NG event showed that the design used on both the 737-200 and the 737NG using the specification for installing the swage (BAC5435) may not be adequate.
The related Elevator Tab service bulletin is 737-27A1297.
ACTION Group 1:
Contact Boeing to get instructions for inspection, change and/or repair for this service bulletin, and do the work instructed by Boeing.
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Original Issue: April 24, 2012 737-27A1302 5 of 44
Group 2:
Remove access panels to gain access to the elevator tab control mechanism (mechanism) and do a detailed inspection of the aft attach lugs (lugs). Look for rotation of the spacer. Also, use a feeler gage to check for any gaps at certain locations. If there is a gap or a loose spacer, then replace the mechanism per the AMM and this SB. If there is no gap or a loose spacer, then return the airplane to a serviceable condition.
Do repeat inspections of the mechanism at the times shown in paragraph 1.E., compliance.
EFFECTIVITY 737-200, 200C Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
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, and/or repair procedures 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.
Original Issue: April 24, 2012 737-27A1302 6 of 44 BOEING SERVICE BULLETIN 737-27A1302
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BOEING SERVICE BULLETIN 737-27A1302
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DO A DETAILED
INSPECTION OF THE
ELEVATOR TAB
CONTROL MECHANISM
AFT LUGS SURROUNDING STRUCTURE NOT SHOWN FOR CLARITY 2129600 Original Issue: April 24, 2012 737-27A1302
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 44
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: April 24, 2012 737-27A1302 8 of 44 BOEING SERVICE BULLETIN 737-27A1302
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-27A1302 Original Issue: April 24, 2012 ATA System: 2731 SUBJECT: FLIGHT CONTROLS - Elevator Tab Control Mechanism Detailed Inspection
THIS BULLETIN 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 SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
1. PLANNING INFORMATION A. Effectivity
1. Airplanes
DESCRIPTIONCONFIGURATIONGROUP 737-200, 200C Airplanes Line Number 288 to 291; Contact Boeing-1 737-200, 200C Airplanes Line Number 292 to 1585-2 Airplane Models:
737-200, 737-200C GroupVariable Number 2PG584 - PG586 2PH001 2PH011 - PH013 2PH021 - PH024 1PH742 2PH743 2PJ003 - PJ009 2PJ105 - PJ119 2PJ201 - PJ219
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Original Issue: April 24, 2012 737-27A1302 9 of 44
GroupVariable Number 2PK026 - PK029 2PK041 - PK053 2PK061 - PK070 2PK081 - PK082 2PK091 - PK099 2PK101 - PK103 2PK111 - PK120 2PK141 - PK146 2PK201 - PK204 2PK211 - PK223 2PK231 - PK241 2PK251 - PK258 2PK271 - PK274 2PK281 - PK289 2PK291 2PK301 - PK318 2PK341 2PK351 - PK361 2PK391 2PK431 - PK433 2PK451 - PK452 2PK461 - PK469 2PK495 2PK501 - PK504 2PK511 - PK515 2PK519 2PK521 - PK528 2PK541 - PK565 2PK581 2PK591 - PK599 2PK601 - PK617 2PK621 - PK637 2PK641 - PK642
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Original Issue: April 24, 2012 737-27A1302 10 of 44 BOEING SERVICE BULLETIN 737-27A1302
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GroupVariable Number 2PK661 - PK666 2PK671 - PK681 2PK691 - PK697 2PK711 - PK716 2PK731 - PK765 2PK771 - PK779 2PK801 - PK804 2PK819 - PK827 2PK830 2PK861 - PK863 2PK871 - PK874 2PK881 - PK884 2PK901 - PK938 2PK971 - PK974 2PL001 - PL028 2PL061 2PL081 2PL101 - PL113 2PL151 2PL171 - PL172 2PL201 - PL203 2PL221 2PL401 - PL417 2PL421 2PL441 2PL451 - PL456 2PL471 2PL491 2PL501 - PL506 2PL551 - PL562 2PL581 2PL601 - PL603 2PL611
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GroupVariable Number 2PL621 - PL626 2PL631 - PL632 1PL712 1PL716 2PL717 - PL747 2PL756 2PL758 2PL761 - PL770 2PL781 - PL788 2PL793 2PM001 - PM006 2PM016 - PM017 2PM021 - PM023 2PM051 - PM066 2PM101 - PM119 2PM141 - PM142 2PM171 2PM181 2PM251 - PM255 2PM281 - PM283 2PN001 - PN002 2PN021 - PN043 2PN081 - PN086 2PN101 - PN117 2PN131 - PN163 2PN401 - PN420 2PN431 - PN433 2PN451 - PN456 2PN471 - PN474 2PN481 2PN491 - PN493 2PN501 - PN502 2PN511 - PN512
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Original Issue: April 24, 2012 737-27A1302 12 of 44 BOEING SERVICE BULLETIN 737-27A1302