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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-53A1319 Original Issue: April 04, 2011 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Crown Skin Lap Joint - Inspection for Lower Row Cracking at Stringer S-4, Between BS 360 and BS 908 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2011 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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 2 B. Concurrent Requirements ...................................... 1 2 C. Reason ................................................ 1 3 D. Description .............................................. 1 3 E. Compliance .............................................. 1 3 F. Approval ............................................... 1 4 G. Manpower .............................................. 1 4 H. Weight and Balance Changes .................................... 1 4 I. Electrical Load Data ......................................... 1 4 J. References .............................................. 1 4
1. Existing Data .......................................... 1 4
2. Data supplied with this Service Bulletin ............................ 1 4
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 1 4 K. Publications Affected ........................................ 1 4 L. Interchangeability and Intermixability of Parts ........................... 1 5
2. MATERIAL INFORMATION ........................................ 1 7 A. Material - Price and Availability ................................... 1 7 B. Industry Support Information .................................... 1 7 C. Parts Necessary For Each Airplane ................................. 1 7
1. Kits/Parts ............................................ 1 7
2. Parts and Materials Supplied by the Operator ........................ 1 7
3. Parts Modified and Reidentified ................................ 1 7
4. Parts Removed and Not Replaced .............................. 1 7 D. Parts Necessary to Change Spares ................................. 1 7 E. Special Tooling - Price and Availability ............................... 1 7 F. Special Tooling Necessary to do this Service Bulletin ....................... 1 7
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 1 9 A. GENERAL INFORMATION ..................................... 1 9 B. WORK INSTRUCTIONS ....................................... 2 0 FIGURE 1: EXTERNAL INSPECTION ................................... 2 1 FIGURE 2: ALTERNATIVE INTERNAL INSPECTION .......................... 2 3 FIGURE 3: CONFIRMING A CRACK INDICATION ............................ 2 6 FIGURE 4: SECOND EXTERNAL INSPECTION - INSPECTION LOCATION .............. 2 9 FIGURE 5: INSPECTION ZONES ..................................... 3 1
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-53A1319Original Issue: April 04, 2011 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Crown Skin Lap Joint - Inspection for Lower Row Cracking at Stringer S-4, Between BS 360 and BS 908
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 737-300 airplane, outside of the effectivity of Service Bulletin (SB) 737-53A1255, experienced a rapid decompression when the lap joint at stringer S-4L between BS 664 - BS 727 cracked and opened up.
Investigation shows that the cracking was caused by fatigue cracking in the lower skin at the lower row of fasteners in the lap joint. The airplane had 39,781 total flight cycles and 48,740 total flight hours. This service bulletin gives instructions to inspect the lower row of fasteners at stringer S-4R and S-4L, from BS 360 to BS 908 for cracking in the lower skin of the lap joint. If cracking at this location goes undetected, the cracks could link up, resulting in an uncontrolled decompression.
Airplanes prior to Line Number 2553 are covered by Service Bulletin (SB) 737-53A1255. This SB covers airplanes from Line Number 2553 to 3132.
ACTION Do a Non Destructive Test (NDT) Dual Frequency Eddy Current (DFEC) external inspection of the lap joint at stringers S-4R and S-4L along the entire length from BS 360 to BS 908.
As an option to doing the external DFEC inspection of the lap joint, you can get access to the interior fuselage and do NDT eddy current and Detailed Inspections.
As an option, crack indications can be confirmed by doing internal eddy current inspections.
If a crack is found, contact Boeing for a repair and do the repair.
EFFECTIVITY 737-300, 737-400, and 737-500 Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
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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 At the time of release of this service bulletin, warranty remedies have not been determined. A subsequent revision or Information Notice will address the warranty remedies available, if any.
MANPOWER TBD
MATERIAL INFORMATION None.
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BOEING SERVICE BULLETIN 737-53A1319
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LOWER SKIN
INSPECT LAP JOINT BETWEEN STA 360 AND STA 908
TEAR STRAP
• *, S-4L/R'
AT THE LOWER ROOF FASTENE
TYPICAL LAP JOINT CONFIGURATION 2068118 Original Issue: April 04, 2011 BOEING PROPRIETARY - 737-53A1319 Copyright © Unpublished Work - See page 1 for details. 7 of 33
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-53A1319 Original Issue: April 04, 2011 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Crown Skin Lap Joint - Inspection for Lower Row Cracking at Stringer S-4, Between BS 360 and BS 908
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 737-300, 737-400 and 737-500 Airplanes-1 Airplane Models:
737-300, 737-400, 737-500 GroupVariable Number 1PJ552 - PJ561 1PJ601 - PJ615 1PJ811 1PJ816 - PJ817 1PM543 - PM550 1PP518 - PP520 1PP876 - PP877 1PQ297 - PQ299 1PQ345 - PQ348
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GroupVariable Number 1PQ370 - PQ373 1PQ391 - PQ395 1PQ408 - PQ410 1PQ414 - PQ418 1PQ431 - PQ438 1PQ447 - PQ448 1PQ451 1PQ454 1PQ473 - PQ475 1PQ772 1PQ933 - PQ935 1PQ951 1PQ971 - PQ997 1PR001 - PR017 1PR021 - PR034 1PR041 - PR045 1PR061 - PR072 1PR077 - PR082 1PR091 - PR092 1PR096 1PR101 1PR121 - PR122 1PR131 - PR132 1PR141 - PR143 1PR161 - PR172 1PR181 1PS617 - PS630 1PS704 - PS706 1PS763 - PS799 1PS811 1PS836 - PS837 1PS841 - PS846 1PS851 - PS852
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GroupVariable Number 1PS856 1PS861 - PS863 1PS866 - PS868 1PS871 - PS874 1PS896 - PS897 1PS901 - PS941 1PS956 - PS957 1PS961 - PS963 1PS971 - PS978 1PT012 - PT015 1PT029 - PT031 1PT064 1PT126 - PT138 1PT188 1PT307 - PT309 1PT513 - PT517 1PT585 - PT586 1PT643 - PT644 1PT656 1PT681 - PT685 1PT716 - PT717 1PT721 - PT725 1PT801 - PT834 1PT851 - PT854 1PT871 - PT886 1PT901 - PT930 1PT971 - PT973 1PT981 - PT985 1PT996 1PU301 1PU311 - PU313 1PV204 - PV209 1PV226 - PV229
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GroupVariable Number 1PV284 - PV287 1PV296 1PV301 - PV302 1PV351 1PV356 - PV357 1PW086 - PW088 1PW168 - PW171 1PW245 - PW252 1PW262 - PW264 1PW271 - PW276 1PW282 - PW292 1PW401 - PW408 1PW411 - PW418 1PW421 - PW424 1PW431 - PW435 1PW441 - PW450 1PW521 - PW522 1PW524 - PW525 1PW527 - PW530 1PW547 - PW550 1PW621 - PW622 1PW635 - PW637 1PW831 1PW851 - PW856
2. Spares Affected B. Concurrent Requirements None.
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