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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-53A1318 Original Issue: October 31, 2011 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Skin Cracking at the Aft Waste Water Drain Mast - Inspection and Repair 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2011 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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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2.0
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 1 7 B. Concurrent Requirements ...................................... 1 7 C. Reason ................................................ 1 7 D. Description .............................................. 1 8 E. Compliance .............................................. 1 8 F. Approval ............................................... 2 0 G. Manpower .............................................. 2 0 H. Weight and Balance Changes .................................... 2 1 I. Electrical Load Data ......................................... 2 1 J. References .............................................. 2 2
1. Existing Data .......................................... 2 2
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 3
2. MATERIAL INFORMATION ........................................ 2 5 A. Material - Price and Availability ................................... 2 5 B. Industry Support Information .................................... 2 5 C. Parts Necessary For Each Airplane ................................. 2 5
1. Kits/Parts ............................................ 2 5
2. Parts and Materials Supplied by the Operator ........................ 2 5
3. Parts Modified and Reidentified ................................ 2 5
4. Parts Removed and Not Replaced .............................. 2 5 D. Parts Necessary to Change Spares ................................. 2 5 E. Special Tooling - Price and Availability ............................... 2 6 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 6
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 7 A. GENERAL INFORMATION ..................................... 2 7 B. WORK INSTRUCTIONS ....................................... 2 8 FIGURE 1: GET ACCESS TO THE DRAIN MAST SUPPORT STRUCTURE [Group 1] ........ 3 1 FIGURE 2: DO A DETAILED INSPECTION OF THE CHANNEL AND THE FILLERS [Group 1] .... 3 4 FIGURE 3: INSPECT THE BONDING STRAP LOCATION [Group 1] .................. 3 6 FIGURE 4: MEASURE THE DIAMETER OF THE WASHERS UNDER THE DRAIN MAST BOLTS [Group 1 ] ................................................ 3 8 FIGURE 5: MEASURE THE THICKNESS OF THE WASHERS UNDER THE DRAIN MAST BOLTS - INSTRUMENT METHOD [Group 1] .............................. 4 0 FIGURE 6: MEASURE THE THICKNESS OF THE WASHERS UNDER THE DRAIN MAST BOLTS - OPTIONAL TOOL METHOD [Group 1] ............................ 4 3 FIGURE 7: REMOVE THE DRAIN MAST [Group 1] ............................ 4 7 FIGURE 8: DO AN HFEC AND DETAILED INSPECTION OF THE SKIN, THE CHANNEL, AND THE FILLERS [Group 1] ............................................ 4 9 FIGURE 9: INSTALL THE DRAIN MAST [Group 1] ............................ 5 2
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FIGURE 10: OPTIONAL TOOL A AND TOOL B - MADE BY THE OPERATOR [Group 1] ........ 5 6
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-53A1318Original Issue: October 31, 2011 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Skin Cracking at the Aft Waste Water Drain Mast - Inspection and Repair
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 This service bulletin is sent to ensure that the aft waste water drain mast is installed correctly. A drain mast that is not installed correctly can cause cracks in the fuselage skin and the internal support structure. The skin cracks can not be seen because they are hidden by the drain mast. If cracks in the fuselage skin are not detected and repaired, they can grow past the frames that are adjacent to the drain mast and reach a critical length. Continued operation of the airplane with undetected cracks could result in uncontrolled decompression of the airplane.
The drain mast is located between BS 986 - BS 1006 and between Stringer S-24L - S-25L.
In January 2010, one operator reported that the aft drain mast was found loose on a 737-400 airplane with approximately 30,500 flight cycles. Further investigation revealed the fuselage skin and surrounding back up structure were cracked. The crack common to the fuselage skin was hidden under the drain mast and was approximately 8 inches long. The crack was probably caused by incorrect installation of the drain mast.
Accomplishment of the inspections in this service bulletin will make sure that the aft drain mast is installed correctly and will make sure that cracks under the aft drain mast are detected and repaired before they reach a critical length.
Boeing Service Related Problem (SRP) 737-SRP-53-0367 is related to this service bulletin.
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ACTION Group 1:
On Group 1 airplanes, get access to the internal support structure for the aft waste water drain mast. Do an internal detailed inspection of the drain mast support structure for cracks or corrosion. If cracks or corrosion are found, then contact Boeing for a repair. Inspect the location of the drain mast ground strap. Inspect the washers under the four bolts that hold the aft drain mast. If the ground strap is installed at an incorrect location, or if incorrect washers are found, then remove the drain mast and do an HFEC inspection of the skin and support structure for cracks. Do a detailed inspection of the skin under the drain mast and the support structure for corrosion. If cracks or corrosion are found, then contact Boeing for a repair.
Group 2:
On Group 2 airplanes, contact Boeing to get instructions for the inspection and repair for this service bulletin, 737-53A1318 Original Issue, and do the work instructed by Boeing.
EFFECTIVITY 737-100/200/200C/300/400/500 Airplanes with the aft waste water drain mast installed. 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, configuration changes, and/or repair procedures given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower .
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
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BOEING SERVICE BULLETIN 737-53A1318
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GET ACCESS TO THE INTERNAL SUPPORT STRUCTURE FOR THE AFT WASTE WATER DRAIN MAST. DO AN INTERNAL DETAILED INSPECTION OF THE DRAIN MAST SUPPORT STRUCTURE FOR CRACKS OR CORROSION. INSPECT THE LOCATION OF THE DRAIN MAST GROUND STRAP. INSPECT THE WASHERS UNDER THE DRAIN MAST BOLTS.
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-53A1318 Original Issue: October 31, 2011 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Skin Cracking at the Aft Waste Water Drain Mast - Inspection and Repair
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 D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
DESCRIPTIONCONFIGURATIONGROUP 737-200/200C/300/400/500 airplanes with an aft waste water drain mast installed, excluding line numbers 1-291 -1 737-100/200 airplanes with an aft waste water drain mast installed, line numbers 1-291 -2 Airplane Models:
737-100, 737-200, 737-200C, 737-300, 737-400, 737-500 GroupVariable Number 2PA001 - PA022 2PA099 2PG001 - PG004 2PG006 - PG019 2PG022 - PG025
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GroupVariable Number 2PG027 2PG030 2PG032 - PG033 2PG038 - PG040 2PG044 - PG045 2PG051 - PG054 2PG057 2PG060 - PG063 2PG065 - PG072 2PG075 1PJ003 - PJ009 1PJ114 - PJ119 1PJ201 - PJ219 1PJ301 - PJ302 1PJ551 - PJ561 1PJ601 - PJ615 1PJ811 1PJ816 - PJ817 1PK201 - PK202 1PK281 - PK289 1PK351 - PK360 1PK391 1PK461 - PK469 1PK495 1PK501 - PK504 1PK611 - PK617 1PK621 - PK637 1PK671 - PK681 1PK731 - PK765 1PK771 - PK779 1PK801 - PK804 1PK819 - PK827 1PK830
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GroupVariable Number 1PK871 - PK874 1PK901 - PK938 1PK971 - PK974 1PL002 - PL024 1PL081 1PL221 1PL401 - PL417 1PL451 - PL456 1PL471 1PL551 - PL562 1PL624 - PL626 1PL631 - PL632 1PL736 - PL747 1PL762 - PL770 1PL783 - PL788 1PM141 - PM142 1PM171 1PM251 - PM255 1PM281 - PM283 1PM381 - PM399 1PM401 - PM417 1PM541 - PM564 1PN001 - PN002 1PN021 - PN043 1PN081 - PN086 1PN101 - PN117 1PN451 - PN456 1PN471 - PN474 1PN501 - PN502 1PN521 1PP001 - PP054 1PP201 - PP205 1PP221
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GroupVariable Number 1PP231 - PP243 1PP281 - PP286 1PP301 - PP305 1PP351 - PP353 1PP384 1PP391 - PP393 1PP401 - PP440 1PP471 - PP475 1PP501 - PP520 1PP671 - PP699 1PP701 - PP733 1PP801 - PP808 1PP821 - PP827 1PP831 - PP848 1PP851 - PP852 1PP861 - PP877 1PP904 - PP936 1PP946 - PP948 1PP951 - PP952 1PP961 - PP967 1PP981 - PP990 1PP993 1PQ001 - PQ016 1PQ026 - PQ041 1PQ051 - PQ092 1PQ101 - PQ199 1PQ201 - PQ202 1PQ241 - PQ243 1PQ251 - PQ267 1PQ281 - PQ299 1PQ301 - PQ307 1PQ331 - PQ332 1PQ341 - PQ348
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