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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-53A1301 Original Issue: September 03, 2009 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Cracks at Chem-milled Steps in Crown Skins at Specified Locations
- 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2009 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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.
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 03, 2009 737-53A1301 1 of 24
5.0
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Original Issue: September 03, 2009 737-53A1301 2 of 24 BOEING SERVICE BULLETIN 737-53A1301
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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 2 D. Description .............................................. 1 2 E. Compliance .............................................. 1 3 F. Approval ............................................... 1 4 G. Manpower .............................................. 1 4 H. Weight and Balance Changes .................................... 1 5 I. Electrical Load Data ......................................... 1 5 J. References .............................................. 1 5
1. Existing Data .......................................... 1 5
2. Data supplied with this Service Bulletin ............................ 1 5
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 1 5 K. Publications Affected ........................................ 1 6 L. Interchangeability and Intermixability of Parts ........................... 1 6
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 ....................................... 1 9 FIGURE 1: FUSELAGE - SKIN AT AREA WITH ELT ANTENNA PROVISION BETWEEN STA 827 AND STA 847 - NON DESTRUCTIVE INSPECTION [Group 2] .................. 2 1 FIGURE 2: FUSELAGE - SKIN AT AREA WITH ELT ANTENNA PROVISION BETWEEN STA 827 AND STA 847 - NON DESTRUCTIVE INSPECTION [Group 1] .................. 2 3
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Original Issue: September 03, 2009 737-53A1301 3 of 24 BOEING SERVICE BULLETIN 737-53A1301
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Original Issue: September 03, 2009 737-53A1301 4 of 24 BOEING SERVICE BULLETIN 737-53A1301
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-53A1301Original Issue: September 03, 2009 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Cracks at Chem-milled Steps in Crown Skins at Specified Locations
- 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 Accomplishment of the inspections in this service bulletin will make sure that fuselage skin cracks at stringers S-1 and S-2R, between Body Stations STA 827 and STA 847 are found and repaired. An Emergency Locator Transmitter (ELT) Antenna structural full pad up doubler provision is at this location on the affected airplanes.
All airplanes listed in this service bulletin require inspection even if the ELT antenna was not installed or has been removed. This action is necessary to find and repair fatigue cracking of the skin panel at the chem-mill steps which could result in rapid decompression of the airplane.
Boeing has received one report from an operator of a hole in the fuselage skin common to stringer S-1 and S-2L, between STA 827 and STA 847. The crack started along the chem-mill edge along stringer S-1. The airplane skin in the area had 20 inch tear strap bays. The airplane diverted to an alternate airport due to cabin depressurization and subsequent deployment of the oxygen masks. The airplane had accumulated 42,569 total flight cycles. Airplanes with 10 inch tear strap bays are also susceptible to cracks at this location. The cause of cracking is under investigation.
Boeing Service Related Problem (SRP) 737-SRP-53-0346 is related to this service bulletin.
ACTION Get external access to the area adjacent to the ELT Antenna provision at stringers S-1 and S-2R, between STA 827 and STA 847.
Do one of the external Non Destructive Inspections (NDI) specified in the compliance section of this service bulletin for cracking in the fuselage skin along the chem-mill step at stringer S-1 and S-2R, between STA 827 and STA 847. The NDIs that can be used are Medium Frequency Eddy Current (MFEC), Magneto Optical Imaging (MOI) or C-Scan. If any crack is found, contact Boeing for repair instructions and do the repair. If no cracking is found, do the repeat inspection in accordance with this service bulletin.
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Original Issue: September 03, 2009 737-53A1301 5 of 24
EFFECTIVITY 737-300/ -400/ -500 Airplanes. 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 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 Elapsed HoursTotal Task HoursAirplanes
3.004.00Group 1
3.004.00Group 2
MATERIAL INFORMATION None.
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Original Issue: September 03, 2009 737-53A1301 6 of 24 BOEING SERVICE BULLETIN 737-53A1301
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BOEING SERVICE BULLETIN 737-53A1301
ALERT ALERT
DO AN MFEC INSPECTION, OR AN MOI
INSPECTION, OR A C-SCAN INSPECTION
FOR CRACKING OF THE FUSELAGE SKIN ALONG THE CHEM-MILL LINES. IF
ANY CRACK IS FOUND, CONTACT
BOEING FOR REPAIR INSTRUCTIONS AND INSTALL THE REPAIR.
SKIN AND DOUBLER - EMERGENCY
LOCATOR TRANSMITTER ANTENNA
LOCATION
STA STA STA 827 847 867 S-2R -
TYPICAL CRACK S-1 S-2L •
DORSAL FIN
DOUBLER FAIRING
NDI INSPECTION AREA 20 INCH TEAR STRAP DOUBLER SHOWN 1878015 10 INCH TEAR STRAP DOUBLER EQUIVALENT Original Issue: September 03, 2009 737-53A1301
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Original Issue: September 03, 2009 737-53A1301 8 of 24 BOEING SERVICE BULLETIN 737-53A1301
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-53A1301 Original Issue: September 03, 2009 ATA System: 5331 SUBJECT: FUSELAGE - Skin - Cracks at Chem-milled Steps in Crown Skins at Specified Locations
- 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
DESCRIPTIONCONFIGURATIONGROUP 737-300/-500 Airplanes with ELT Antenna provisions and 10 inch tear strap bays -1 737-300/-400/-500 Airplanes with ELT Antenna provisions and 20 inch tear strap bays -2 Airplane Models:
737-300, 737-400, 737-500 GroupVariable Number 2PJ604 - PJ615 2PM543 - PM550 2PP518 - PP520 2PP876 - PP877 2PQ297 - PQ299 2PQ345 - PQ348 2PQ370 - PQ373
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Original Issue: September 03, 2009 737-53A1301 9 of 24
GroupVariable Number 2PQ391 - PQ395 2PQ408 - PQ410 2PQ414 - PQ418 2PQ431 - PQ438 2PQ447 - PQ448 2PQ451 2PQ454 2PQ473 - PQ475 2PQ772 1PQ931 - PQ932 2PQ933 - PQ935 2PQ951 2PQ971 - PQ997 2PR001 - PR017 2PR021 - PR034 2PR041 - PR045 2PR061 - PR072 2PR077 - PR082 2PR091 - PR092 2PR096 2PR101 2PR121 - PR122 2PR131 - PR132 2PR141 - PR143 2PR161 - PR172 2PR181 2PS617 - PS630 2PS704 - PS706 2PS763 - PS799 2PS811 2PS836 - PS837 2PS841 - PS846 2PS851 - PS852
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Original Issue: September 03, 2009 737-53A1301 10 of 24 BOEING SERVICE BULLETIN 737-53A1301
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GroupVariable Number 2PS856 2PS861 - PS863 2PS866 - PS868 2PS871 - PS874 2PS896 - PS897 2PS901 - PS941 2PS956 - PS957 2PS961 - PS963 2PS971 - PS978 2PT012 - PT015 2PT029 - PT031 2PT064 2PT126 - PT138 1PT181 - PT187 2PT188 1PT295 2PT307 - PT309 2PT513 - PT517 2PT585 - PT586 2PT643 - PT644 2PT656 2PT681 - PT685 1PT701 - PT703 2PT716 - PT717 2PT721 - PT725 2PT801 - PT834 2PT851 - PT854 2PT871 - PT886 2PT901 - PT930 2PT971 - PT973 2PT981 - PT985 2PT996 2PU301
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Original Issue: September 03, 2009 737-53A1301 11 of 24 BOEING SERVICE BULLETIN 737-53A1301
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GroupVariable Number 2PU311 - PU313 2PV229 2PV356 - PV357 2PW168 - PW171 2PW263 - PW264 2PW405 - PW408 2PW416 - PW418 2PW421 - PW424 2PW431 - PW435 2PW441 - PW450 2PW853 - PW856
2. Spares Affected None.
B. Concurrent Requirements None.
C. Reason Accomplishment of the inspections in this service bulletin will make sure that fuselage skin cracks at stringers S-1 and S-2R, between Body Stations STA 827 and STA 847 are found and repaired. An Emergency Locator Transmitter (ELT) Antenna structural full pad up doubler provision is at this location on the affected airplanes. All airplanes listed in this service bulletin require inspection even if the ELT antenna was not installed or has been removed. This action is necessary to find and repair fatigue cracking of the skin panel at the chem-mill steps which could result in rapid decompression of the airplane.
Boeing has received one report from an operator of a hole in the fuselage skin common to stringer S-1 and S-2L, between STA 827 and STA 847. The crack started along the chem-mill edge along stringer S-1. The airplane skin in the area had 20 inch tear strap bays. The airplane diverted to an alternate airport due to cabin depressurization and subsequent deployment of the oxygen masks. The airplane had accumulated 42,569 total flight cycles. Airplanes with 10 inch tear strap bays are also susceptible to cracks at this location. The cause of cracking is under investigation.
Boeing Service Related Problem (SRP) 737-SRP-53-0346 is related to this service bulletin.
D. Description Get external access to the area adjacent to the ELT Antenna provision at stringers S-1 and S-2R, between STA 827 and STA 847.
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Original Issue: September 03, 2009 737-53A1301 12 of 24 BOEING SERVICE BULLETIN 737-53A1301