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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1302 Original Issue: December 15, 2008 ATA System: 5754 SUBJECT: WINGS - Leading Edge Slats- Main Track Down Stop Modification and 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2008 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, 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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.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: December 15, 2008 737-57A1302 1 of 37
6.0
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 15, 2008 737-57A1302 2 of 37 BOEING SERVICE BULLETIN 737-57A1302
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 1 9 B. Concurrent Requirements ...................................... 1 9 C. Reason ................................................ 1 9 D. Description .............................................. 1 9 E. Compliance .............................................. 2 0 F . Approval ............................................... 2 0 G. Manpower .............................................. 2 1 H. Weight and Balance Changes .................................... 2 1 I. Electrical Load Data ......................................... 2 1 J. References .............................................. 2 1
1. Existing Data .......................................... 2 1
2. Data supplied with this Service Bulletin ............................ 2 2
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 2 2 K. Publications Affected ......................................... 2 2 L. Interchangeability and Intermixability of Parts ........................... 2 2
2. MATERIAL INFORMATION ........................................ 2 3 A. Material - Price and Availability ................................... 2 3 B. Industry Support Information .................................... 2 3 C. Parts Necessary For Each Airplane ................................. 2 3
1. Kits/Parts ............................................ 2 3
2. Parts and Materials Supplied by the Operator ........................ 2 4
3. Parts Modified and Reidentified ................................ 2 4
4. Parts Removed and Not Replaced .............................. 2 4 D. Parts Necessary to Change Spares ................................. 2 4 E. Special Tooling - Price and Availability ............................... 2 4 F . Special Tooling Necessary to do this Service Bulletin ....................... 2 5
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 7 A. GENERAL INFORMATION ..................................... 2 7 B. WORK INSTRUCTIONS ....................................... 2 7 FIGURE 1: SHRINK-FIT BUSHING INSTALLATION ........................... 3 0 FIGURE 2: SHRINK-FIT BUSHING REAMING .............................. 3 1 FIGURE 3: SLAT MAIN TRACK DOWN STOP AND AFT SIDE GUIDE MODIFICATION ........ 3 2 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 15, 2008 737-57A1302 4 of 37 BOEING SERVICE BULLETIN 737-57A1302
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-57A1302Original Issue: December 15, 2008 ATA System: 5754 SUBJECT: WINGS - Leading Edge Slats- Main Track Down Stop Modification and 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 Recently, a fuel leak and a subsequent fire resulted from loose down stop assembly hardware being pushed through the slat can while the slats were being retracted. FAA Airworthiness Directive AD 2007-18-52 was initiated to inspect the 737NG fleet and re-torque the down stop assemblies as a result of this fire. Several issues were found including missing hardware, low torque, and improper assembly. This service bulletin requires 1) removal of the existing down stop assemblies and installation of a new down stop assembly on all 16 slat main tracks, and 2) removal of the existing aft side guide attach bolts at all 64 locations and replacement with identical bolts with drilled heads that are lock wired together on the ribs of the leading edge of the wing. Failure to incorporate this service bulletin could lead to conditions that allow the down stop assembly to fall off, or the aft side guides to become loose, and fall into the slat can. If the down stop assembly comes apart inside the slat can or the aft side guide falls into the slat can, then the slat main track may trap a down stop assembly component between the slat can and slat main track causing a puncture of the fuel tank creating a fuel leak and the risk of fire.
Boeing Service Related Problem (SRP) 737-SRP-57-0209 is related to this service bulletin.
ACTION (PRR 38275-136S) Remove the existing down stop assembly hardware from the slat main tracks of slats one through eight. Install the new down stop assembly hardware in the correct order and torque the nut. Install the cotter pin after all other hardware has been installed and bend the legs of the cotter pin. Remove the bolts which secure the aft side guides to the leading edge slat track ribs and replace them with the new drilled head bolts. Install the lock wire on the aft side guide boltheads. After the changes are done, do a detailed inspection for debris on the slat main track and in the slat can.
Special tooling is available from Boeing to assist with the installation of the down stop assembly hardware.
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 15, 2008 737-57A1302 5 of 37
EFFECTIVITY 737-600, 700, 700C, 800, 900, 900ER airplanes. See Paragraph 1.A.1., Airplanes, for effectivity.
COMPLIANCE Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes and/or repair procedures given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Boeing Supplied Kits/Parts.
Refer to Paragraph 2.A., Material - Price and Availability BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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BOEING SERVICE BULLETIN 737-57A1302
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LEFT WING SHOWN (RIGHT WING IS EQUIVALENT)
REMOVE AND REPLACE BOLT,
INSTALL LOCKWIRE AT EACH
MAIN TRACK (4 LOCATIONS)
REMOVE AND REPLACE DOWNSTOP.
DO A DETAILED
INSPECTION FOR DEBRIS
ON THE SLAT MAIN TRACK AND IN THE SLAT CAN.
SLAT NUMBER 3 SHOWN 1571129 TYPICAL 16 LOCATIONS Original Issue: December 15, 2008 737-57A1302 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 37
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1302 Original Issue: December 15, 2008 ATA System: 5754 SUBJECT: WINGS - Leading Edge Slats- Main Track Down Stop Modification and 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 Refer to Service Bulletin Index Document D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplanes shown below. An equivalent change is on subsequent production airplanes. Refer to PRR 38275-136S for data about this change.
DESCRIPTIONCONFIGURATIONGROUP 737-600/700/700C/800/900/900ER airplanes line numbers 1 through 2699 -1 Airplane Models:
737-600, 737-700, 737-700C, 737-800, 737-900, 737-900ER GroupVariable Number 1YA001 - YA099 1YA101 - YA199 1YA201 - YA211 1YA221 1YA231 - YA242 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1YA251 - YA256 1YA271 - YA272 1YA291 1YA301 - YA302 1YA311 - YA314 1YA321 - YA323 1YA336 - YA345 1YA351 1YA356 - YA357 1YA366 - YA367 1YA371 - YA377 1YA501 - YA536 1YA541 - YA552 1YA571 - YA578 1YA601 - YA615 1YA621 - YA622 1YA626 - YA631 1YA635 - YA636 1YA641 - YA642 1YA645 - YA650 1YA656 - YA659 1YA666 - YA667 1YA671 - YA672 1YA681 - YA691 1YA701 - YA710 1YA721 - YA722 1YA731 - YA734 1YA751 - YA756 1YA801 - YA803 1YA809 1YA811 - YA814 1YA831 - YA835 1YA841 - YA862 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1YA881 - YA882 1YA891 - YA892 1YA961 - YA978 1YB001 - YB006 1YB101 - YB132 1YB151 - YB153 1YB156 - YB158 1YB161 - YB164 1YB171 - YB172 1YB181 - YB184 1YB201 - YB208 1YB271 1YB276 1YB301 - YB310 1YB371 - YB392 1YB501 - YB502 1YB521 - YB526 1YB541 - YB544 1YB551 1YB561 - YB598 1YB601 - YB632 1YB651 1YB656 1YB671 - YB672 1YB851 - YB863 1YB871 - YB874 1YB881 - YB893 1YB901 - YB903 1YB911 1YB961 - YB974 1YB986 - YB987 1YC001 - YC030 1YC051 - YC084 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1YC091 - YC094 1YC101 - YC104 1YC111 - YC113 1YC121 1YC126 - YC127 1YC136 - YC141 1YC146 - YC147 1YC151 - YC156 1YC166 - YC171 1YC176 - YC179 1YC186 - YC190 1YC201 - YC203 1YC206 - YC207 1YC301 - YC305 1YC321 - YC387 1YC391 - YC394 1YC396 1YC401 - YC417 1YC421 - YC422 1YC426 - YC428 1YC436 - YC439 1YC441 - YC448 1YC451 - YC455 1YC459 1YC461 - YC467 1YC471 - YC499 1YC501 - YC526 1YC571 - YC583 1YC587 - YC589 1YC591 - YC593 1YC601 - YC655 1YC681 - YC696 1YC701 - YC715 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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