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Commercial Airplanes 737 Service Bulletin Number: 737-57A1301 Original Issue: February 05, 2008 Revision 3: August 11, 2011 ATA System: 5754 SUBJECT: WINGS - Flight Surfaces - Leading Edge Slats - Main Track Downstop Assembly Inspection and Modification 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2008 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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, 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: February 05, 2008 737-57A1301Revision 3: August 11, 2011 1 of 94
6.0
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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 ........................................ 1 8 B. Concurrent Requirements ...................................... 1 8 C. Reason ................................................ 1 8 D. Description .............................................. 1 9 E. Compliance .............................................. 2 0 F. Approval ............................................... 2 3 G. Manpower .............................................. 2 4 H. Weight and Balance Changes .................................... 2 5 I. Electrical Load Data ......................................... 2 6 J. References .............................................. 2 6
1. Existing Data .......................................... 2 6
2. Data supplied with this Service Bulletin ............................ 2 6
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 2 6 K. Publications Affected ........................................ 2 6 L. Interchangeability and Intermixability of Parts ........................... 2 7
2. MATERIAL INFORMATION ........................................ 2 9 A. Material - Price and Availability ................................... 2 9 B. Industry Support Information .................................... 2 9 C. Parts Necessary For Each Airplane ................................. 3 0
1. Kits/Parts ............................................ 3 0
2. Parts and Materials Supplied by the Operator ........................ 3 1
3. Parts Modified and Reidentified ................................ 3 1
4. Parts Removed and Not Replaced .............................. 3 1 D. Parts Necessary to Change Spares ................................. 3 1 E. Special Tooling - Price and Availability ............................... 3 1 F. Special Tooling Necessary to do this Service Bulletin ....................... 3 2
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 3 3 A. GENERAL INFORMATION ..................................... 3 3 B. WORK INSTRUCTIONS ....................................... 3 4 FIGURE 1: DETAILED INSPECTION OF THE DOWNSTOP ASSEMBLY [Group 1, Configuration 1] . 39 FIGURE 2: DETAILED INSPECTION OF THE DOWNSTOP ASSEMBLY [Group 1, Configuration 2; Group 2 ] ................................................ 4 1 FIGURE 3: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 1 [Group 1, Configuration 1 ] ................................................ 4 4 FIGURE 4: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 2 [Group 1, Configuration 1 ] ................................................ 4 9 FIGURE 5: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 3 [Group 1, Configuration 1 ] ................................................ 5 2 FIGURE 6: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 4 [Group 1, Configuration 1 ] ................................................ 5 5
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FIGURE 7: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 5 [Group 1, Configuration 1 ] ................................................ 5 8 FIGURE 8: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 6 [Group 1, Configuration 1 ] ................................................ 6 1 FIGURE 9: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 1 [Group 1, Configuration 2; Group 2] ........................................... 6 6 FIGURE 10: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 2 [Group 1, Configuration 2; Group 2] ........................................... 7 1 FIGURE 11: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 3 [Group 1, Configuration 2; Group 2] ........................................... 7 4 FIGURE 12: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 4 [Group 1, Configuration 2; Group 2] ........................................... 7 7 FIGURE 13: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 5 [Group 1, Configuration 2; Group 2] ........................................... 8 0 FIGURE 14: SLAT MAIN TRACK DOWNSTOP ASSEMBLY MODIFICATION - SLAT 6 [Group 1, Configuration 2; Group 2] ........................................... 8 3 FIGURE 15: TAPERED FILLER FABRICATION (FOR SLAT CAN) .................... 8 8 FIGURE 16: TAPERED FILLER AND SLAT CAN INSTALLATION .................... 9 0 FIGURE 17: SLAT CAN REPAIR ...................................... 9 3
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Commercial Airplanes 737 Service Bulletin Revision Transmittal SheetNumber: 737-57A1301Original Issue: February 05, 2008 Revision 3: August 11, 2011 ATA System: 5754 SUBJECT: WINGS - Flight Surfaces - Leading Edge Slats - Main Track Downstop Assembly Inspection and Modification This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION More work is necessary on the airplane(s) changed in accordance with the original issue, Revision 1 or Revision 2 of this service bulletin. A new foreign object debris (FOD) inspection has been added with a decreased compliance time.
Federal Aviation Administration (FAA) Airworthiness Directive 2008-06-29, is related to this service bulletin.
REASON FOR REVISION This revision is sent to add a new detailed inspection for Fod in the slat can, to inform operators of the option to replace a damaged slat can instead of repairing it and that the slat can needs to be replaced if they find a crack. The general information note section was update to include the new standard notes.
These sections were changed:
1. Summary - Background, Added new service history for FOD findings and referenced the new SRP.
2. Paragraph 1.B. Concurrent Requirements, removed the old requirement and change it to None.
3. Paragraph 1.C. Reason, Added new service history for FOD findings and referenced the new SRP.
4. Paragraph 1.E. Compliance, Revised Table 2 and added Table 3. Provided option to replace a damaged slat can instead of repairing it and provided a disposition for a cracked slat can.
5. Paragraph 1.F. Approval, Updated the revision level of the service bulletin in the AMOC paragraphs.
6. Paragraph 2.E. Special Tooling, revised the tool number to 2MIT65C37853-59 (this is equivalent to MIT65C37853-59 Rev B).
7. Paragraph 3.A. General Information, Updated the notes to the current standard.
8. Paragraph 3.B. Work Instruction, Part 2 and Part 3, Provided option to replace a damaged slat can instead of repairing it and provided a disposition for a cracked slat can. In Part 3, step 1.a. added the word, detailed in front of inspection. In Part 4 and Part 5 deleted step 3 FOD inspection.
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9. Figures 1 and 2 note (a) added the word, detailed in front of inspection.
10. Figures 3 thru 14 note (f), revised the tool number to 2MIT65C37853-59 (this is equivalent to MIT65C37853-59 Rev B).
11. Through out the SB were the words part, object or debris are used the word (FOD) has been added.
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 February 05, 2008Original Issue:
September 24, 2009Revision 1:
January 17, 2011Revision 2:
August 11, 2011Revision 3:
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Commercial Airplanes 737 Service Bulletin SummaryNumber: 737-57A1301Original Issue: February 05, 2008 Revision 3: August 11, 2011 ATA System: 5754 SUBJECT: WINGS - Flight Surfaces - Leading Edge Slats - Main Track Downstop Assembly Inspection and Modification
CONCURRENT REQUIREMENTS None.
BACKGROUND Since 1985, Boeing has received 32 reports of fuel leaking from the slat track housing (slat can) on 737-300, -400, and -500 airplanes due to a number of causes. In all 32 cases, there were no reports of a fire as a result of the fuel leaks. In five of the reports, the fuel leak was known to be caused by loose or broken downstop assembly hardware falling into the slat can and then subsequently being driven into the slat can by the retracting slat track. This service bulletin calls for a detailed inspection of the downstop assembly on the main tracks of the number 2, 3, 4, and 5 slats and the inboard track of the number 1 and 6 slats. An incorrectly installed downstop assembly can allow downstop hardware to fall off of the slat track and into the slat can, which could lead to a fuel leak and fire when the slat is retracted and the hardware is pushed into the slat can.
An additional 3 reports were received from operators in 2010 of fuel leaks that had been caused by FOD - foreign object debris found in the slat can.
Service History FOD ReportedReport Date Hi-Lok - Slat can had been replaced 9 months prior.
2/3/2010 Loose washer4/30/2010 Extra downstop10/17/2010 Boeing Service Related Problem (SRP) 737-SRP-57-0208 is related to this service bulletin.
Boeing Service Related Problem (SRP) 737-SRP-57-0249 is related to this service bulletin.
ACTION (PRR 35005-290RS) Do a detailed inspection of the main track downstop assemblies on the number 2, 3, 4, and 5 slats and the inboard track of the number 1 and 6 slats. Make sure that each downstop assembly has all the parts installed, that they are installed in the correct order, and that they are undamaged. Disassembly of the downstop is not required to accomplish this inspection.
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— If the parts are not in the correct order but are undamaged, then remove the downstop assembly and install the parts correctly.
— If the downstop assembly has a cracked or broken locator, then install a new locator.
— If the downstop assembly has a damaged part or if the downstop assembly has a missing part, then replace the damaged or missing part and do a detailed inspection for loose objects (FOD) in the slat can and a detailed inspection for damage to the slat can.
To terminate repeat inspections on slats one through six:
– Install new downstop assembly hardware. Special tooling is available from Boeing to assist with the installation of the downstop assembly hardware.
– Do a One-time inspection of the slat can for damage and debris (FOD). If there is damage, then:
– install a tapered filler as required and repair the slat can, OR – replace the slat can. Install a tapered filler as required.
EFFECTIVITY 737-300, -400, and -500 airplanes. Refer to Paragraph 1.A.1, Airplanes, for the list of affected airplanes.
COMPLIANCE Refer to Paragraph 1.E., Compliance.
Federal Aviation Administration Airworthiness Directive FAA AD 2008-06-29, is related to this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing Industry Support information is provided in Program Letter BPL 6-1151-737-PGM-190 dated March 9, 2009. Additional copies of program letters are available from Boeing Warranty & Product Assurance Contracts.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION None.
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BOEING SERVICE BULLETIN 737-57A1301
LEFT WING SHOWN (RIGHT WING IS EQUIVALENT)
FWD INBD
DO A DETAILED INSPECTION FOR
CORRECT PARTS AND CORRECT ORDER SEE (STACKUP). IF PARTS OR STACKUP
IS NOT CORRECT, THEN DO A
DETAILED INSPECTION FOR LOOSE OBJECTS IN THE SLAT CAN.
TO TERMINATE REPEAT INSPECTIONS,
REPLACE DOWNSTOP COMPONENTS AND
DO ONE-TIME DETAILED INSPECTION
OF SLAT CAN FWDI INBD SLAT NUMBER 3 SHOWN 1475105 (TYPICAL) Original issue: February 05, 2008 Revision 3: August 11, 2011 737-57A1301
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Commercial Airplanes 737 Service Bulletin Number: 737-57A1301 Original Issue: February 05, 2008 Revision 3: August 11, 2011 ATA System: 5754 SUBJECT: WINGS - Flight Surfaces - Leading Edge Slats - Main Track Downstop Assembly Inspection and Modification
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.
DESCRIPTIONCONFIGURATIONGROUP 737-300 airplanes Line Number 1001 - 1517-1 that have not done the downstop changes as given in Service Bulletin 737-57-1175 1 that have done the downstop changes as given in Service Bulletin 737-57-1175 2 737-300 airplanes Line Number 1518 and on, and all 737-400 and -500 airplanes -2 Airplane Models:
737-300, 737-400, 737-500 GroupVariable Number 2PJ301 - PJ302 2PJ551 - PJ561 2PJ601 - PJ615 2PJ811 2PJ816 - PJ817
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GroupVariable Number 2PM381 - PM399 2PM401 - PM417 2PM541 - PM564 1PP001 - PP043 2PP044 - PP054 1PP101 - PP126 2PP127 - PP160 1PP161 - PP169 1PP181 - PP189 2PP190 - PP199 1PP201 - PP204 2PP205 1PP221 1PP231 - PP243 1PP281 - PP286 1PP301 - PP305 1PP351 - PP353 1PP376 - PP384 2PP391 - PP393 1PP401 - PP432 2PP433 - PP440 1PP471 - PP475 1PP501 - PP504 2PP505 - PP520 1PP521 - PP522 1PP631 - PP634 1PP651 - PP652 1PP671 - PP699 1PP701 - PP729 2PP730 - PP733 1PP771 - PP777 2PP778 - PP779 1PP801 - PP804
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