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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-27A1297 Original Issue: April 16, 2010 Revision 1: August 02, 2010 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2010 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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.
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Original Issue: April 16, 2010 737-27A1297Revision 1: August 02, 2010 1 of 68
5.0
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Table of Contents
Revision Transmittal Sheet5
Summary7
1. PLANNING INFORMATION ........................................ 1 1 A. Effectivity ............................................... 1 1
1. Airplanes ............................................ 1 1
2. Spares Affected ........................................ 2 6 B. Concurrent Requirements ...................................... 2 6 C. Reason ................................................ 2 6 D. Description .............................................. 2 7 E. Compliance .............................................. 2 8 F. Approval ............................................... 3 0 G. Manpower .............................................. 3 0 H. Weight and Balance Changes .................................... 3 2 I. Electrical Load Data ......................................... 3 2 J. References .............................................. 3 2
1. Existing Data .......................................... 3 2
2. Data supplied with this Service Bulletin ............................ 3 2
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 3 2 K. Publications Affected ........................................ 3 2 L. Interchangeability and Intermixability of Parts ........................... 3 2
2. MATERIAL INFORMATION ........................................ 3 3 A. Material - Price and Availability ................................... 3 3 B. Industry Support Information .................................... 3 3 C. Parts Necessary For Each Airplane ................................. 3 3
1. Kits/Parts ............................................ 3 3
2. Parts and Materials Supplied by the Operator ........................ 3 4
3. Parts Modified and Reidentified ................................ 3 4
4. Parts Removed and Not Replaced .............................. 3 4 D. Parts Necessary to Change Spares ................................. 3 4 E. Special Tooling - Price and Availability ............................... 3 4 F. Special Tooling Necessary to do this Service Bulletin ....................... 3 4
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 3 5 A. GENERAL INFORMATION ..................................... 3 5 B. WORK INSTRUCTIONS ....................................... 3 5 FIGURE 1: ACCESS PANEL REMOVAL & INSTALLATION - LEFT SIDE ................ 4 4 FIGURE 2: AFT ATTACH LUG DETAILED INSPECTION - INBOARD LUG - LEFT SIDE ....... 4 6 FIGURE 3: AFT ATTACH LUG DETAILED INSPECTION - OUTBOARD LUG - LEFT SIDE ...... 5 1 FIGURE 4: ACCESS PANEL REMOVAL & INSTALLATION - RIGHT SIDE ............... 5 6 FIGURE 5: AFT ATTACH LUG DETAILED INSPECTION - INBOARD LUG - RIGHT SIDE ...... 5 8 FIGURE 6: AFT ATTACH LUG DETAILED INSPECTION - OUTBOARD LUG - RIGHT SIDE ..... 6 3 FIGURE 7: DETERMINING IF REPLACEMENT MECHANISM IS NOT BOEING BUILT ........ 6 8
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Original Issue: April 16, 2010 737-27A1297Revision 1: August 02, 2010 3 of 68 BOEING SERVICE BULLETIN 737-27A1297
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Original Issue: April 16, 2010 737-27A1297Revision 1: August 02, 2010 4 of 68 BOEING SERVICE BULLETIN 737-27A1297
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Commercial Airplanes 737 Service Bulletin ALERT Revision Transmittal SheetNumber: 737-27A1297Original Issue: April 16, 2010 Revision 1: August 02, 2010 ATA System: 2731 SUBJECT: FLIGHT CONTROLS - Elevator Tab Control Mechanism Detailed Inspection This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION More work is necessary on airplanes inspected in accordance with the original issue of this service bulletin:
Group 2 airplanes now require repeat inspections.
Airplanes were added to new Group 3 of this service bulletin effectivity and airplanes were added to existing Group 2 of this service bulletin effectivity.
Federal Aviation Administration (FAA) Airworthiness Directive AD 2010-09-05, is related to this service bulletin.
REASON FOR REVISION This revision is sent to: add new Group 3 airplanes to the effectivity and add an inspection and compliance for Group 3 airplanes; add airplanes to existing Group 2 effectivity and change the compliance for Group 2 airplanes;
remove the terminating action from the compliance; change the inspection method; delete Figure 7, "Determining if Replacement Mechanism is not Boeing Built" and all associated steps in the Work Instructions; provide manpower estimates; add warranty information; add convenience kit information.
These sections were changed:
1. In paragraph 1.A., Effectivity, added Group 3 airplanes to the Group/Configuration table and to the effectivity.
2. In Paragraph 1.E., Compliance, changed the requirements for Group 2 airplanes, added Group 3 compliance, removed terminating action,
3. In Paragraph 1.G., Manpower, added manpower tables.
4. In Paragraph 2.B., Industry Support Information, added warranty remedies.
5. In Paragraph 2.C., Parts Necessary For Each Airplane, added convenience kit information.
6. In Figures 2, 3, 5, and 6, clarified feeler gage requirements and changed allowable depths.
7. Deleted Figure 7.
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Original Issue: April 16, 2010 737-27A1297Revision 1: August 02, 2010 5 of 68
The data given in Information Notices 737-27A1297 IN 01, IN 02 and IN 03 is included in this revision, as applicable.
Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location of important changes.
Pages with no vertical lines have no important changes.
REVISION HISTORY April 16, 2010Original Issue:
August 02, 2010Revision 1:
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Original Issue: April 16, 2010 737-27A1297Revision 1: August 02, 2010 6 of 68 BOEING SERVICE BULLETIN 737-27A1297
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-27A1297Original Issue: April 16, 2010 Revision 1: August 02, 2010 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 An operator experienced a vibration event 21 days after performing inspections on the swage ring and spacer on the elevator tab control mechanism (mechanism) in accordance with Service Bulletin (SB) 737-27A1296.
Investigation revealed that the vibration was most likely caused by the same conditions that Service Bulletin 737-27A1296 was meant to detect, but did not. For the most critical group of airplanes, this service bulletin does a more enhanced inspection than the inspection in SB 737-27A1296 and continues with repeat inspections. The more enhanced inspection includes using a feeler gage at specific locations to check for gaps. The inspections in this SB will detect a loose bearing in the aft attach lugs of the elevator tab control mechanism. A loose bearing in the aft attach lug of the elevator tab control mechanism could lead to unwanted elevator tab freeplay and then elevator tab vibration which could lead to structural failure of the elevator or the horizontal stabilizer.
Since the initial release of this service bulletin, several operators have reported gaps in Boeing-built mechanisms, but no loose bearings. Also, additional analysis by Boeing has shown that non-Boeing built mechanisms built after Line Number 2708 may have bearings which will come loose. Because of this, the effectivity of this service bulletin is being increased to include airplanes beyond the effectivity of the initial release. Also, installing a Boeing-built mechanism is no longer terminating action to the repeat inspections.
ACTION Remove the seal plate and lower hinge cover 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.
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Original Issue: April 16, 2010 737-27A1297Revision 1: August 02, 2010 7 of 68
EFFECTIVITY 737-600, -700, -700C, -800, -900, and -900ER Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
COMPLIANCE Refer to Paragraph 1.E., Compliance.
Federal Aviation Administration (FAA) Airworthiness Directive AD 2010-09-05 is related to this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for 737 airplanes in warranty as of March 11, 2010. Please refer to Paragraph 2.B., Industry Support Information.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION None.
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Original Issue: April 16, 2010 737-27A1297Revision 1: August 02, 2010 8 of 68 BOEING SERVICE BULLETIN 737-27A1297
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BOEING SERVICE BULLETIN 737-27A1297
ALERT ALERT FWO
DO A DETAILED
INSPECTION OF THE
ELEVATOR TAB
CONTROL MECHANISM
AFT LUGS SURROUNDING STRUCTURE NOT SHOWN FOR CLARITY 1975845 Original Issue: April 16, 2010 Revision 1: August 02, 2010 737-27A1297
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9 of 68
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-27A1297 Original Issue: April 16, 2010 Revision 1: August 02, 2010 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 NOTE: This service bulletin is for the airplanes identified below. The effectivity list shown below is complete for airplanes through line number 3554. At least one airplane after line number 3554 is also affected by this service bulletin, and these airplanes are in Group(s) 2. These airplanes will be added to the service bulletin's MyBoeingFleet.com (MBF) \"get effectivity\" result when they are added to the MBF Fleet Profile Page.
DESCRIPTIONCONFIGURATIONGROUP Airplanes Line Number 2508 to 2707-1 Airplanes Line Number 2708 and on-2 Airplanes Line Number 1 to 2507-3 Airplane Models:
737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER GroupVariable Number 3YA001 - YA099 3YA101 - YA199 3YA201 - YA211
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GroupVariable Number 3YA221 3YA231 - YA242 3YA251 - YA256 3YA271 - YA272 3YA291 3YA301 - YA302 3YA311 - YA314 3YA321 - YA323 3YA336 - YA345 3YA351 3YA356 - YA357 3YA366 - YA367 3YA371 - YA377 3YA501 - YA536 3YA541 - YA552 3YA571 - YA578 3YA601 - YA615 3YA621 - YA622 3YA626 - YA631 3YA635 - YA636 3YA641 - YA642 3YA645 - YA650 3YA656 - YA659 3YA666 - YA667 3YA671 - YA672 3YA681 - YA691 3YA701 - YA710 3YA721 - YA722 3YA731 - YA734 3YA751 - YA756 3YA801 - YA803 3YA809 3YA811 - YA814
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Original Issue: April 16, 2010 737-27A1297Revision 1: August 02, 2010 12 of 68 BOEING SERVICE BULLETIN 737-27A1297