# Boeing Alert Service Bulletin 737-53A1241: Revision 1

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2013-0836; AD 2014-22-06 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Service Bulletin 737-53A1241](https://openairdocs.org/service-documents/boeing/737-53a1241.md)
- Title as filed: Boeing SB-737-53A1241-00
- Pages: 46
- PDF: https://openairdocs.org/files/sha256/c3/fe/c3fec2f86dc30c5710b4284af3a0096b34360978f37b2d14189a141ea25c88a1
- Page: https://openairdocs.org/service-documents/boeing/737-53a1241/file/c3fec2f86dc3

## Text

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### Page 1

June 13, 2002
737-53A1241
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 1 of 46
 
 
ALERT ALERT
Commercial
Airplane
Group 737
ALERTALERT
Service Bulletin
Number: 737-53A1241
Date: June 13, 2002
ATA System: 5311
SJC
SUBJECT: FUSELAGE - Frames and Bulkheads - Sta 291.5 Frame Inspection at Stringer 16R - 
Forward Galley Door Cutout
BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET
Copyright © 2002 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Unpublished Work - All Rights Reserved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, BBJ, DC-8, DC-9, 
DC-10, MD-10, MD-11, MD-80, MD-88, MD-90, and the red-white-and-blue 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.

### Page 2

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
BLANK PAGE

### Page 3

June 13, 2002
737-53A1241
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 3 of 46
 
 
ALERT ALERT
Commercial
Airplane
Group 737
ALERTALERT
Service Bulletin
Number: 737-53A1241 Summary
Date: June 13, 2002
ATA System: 5311
SJC
SUBJECT: FUSELAGE - Frames and Bulkheads - Sta 291.5 Frame Inspection at Stringer 16R - 
Forward Galley Door Cutout
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 gives instructions to do an inspection of the Sta 291.5 frame near the forward galley door 
cutout for cracks at stringer 16R. Accomplishment of this service bulletin will prevent a possible rapid 
decompression and potential separation of the forward galley door from the airplane.
Boeing has received a report of one crack on a 737-200 airplane on the Sta 291.5 frame. The airplane had 
accumulated 66,043 flight cycles and 45,989 flight hours.  The Sta 291.5 frame is a body frame forward of the 
forward galley door cutout.  The crack was found from the aft side of the frame web at the cutout for the doorstop 
intercostal strap at stringer 16R.
Undetected or remaining cracks in the frame will propagate by normal fatigue due to cyclic cabin pressure 
loading.  Continued operation with undetected crack(s) could lead to a severed frame.  Loss of the frame would 
render the doorstops ineffective and result in a possible rapid decompression and potential separation of the 
forward galley door from the airplane.
Boeing Service Related Problem (SRP) 737-SRP-53-0149 is related to this service bulletin.
ACTION
Get access to the aft side of the Sta 291.5 frame at stringer 16R.  Do an eddy current inspection of  the frame 
web around the cutout for the doorstop intercostal strap at stringer 16R.
EFFECTIVITY
737-100/-200/-200C/-300/-400/-500 airplanes line numbers 1 through 3132, except airplanes PJ201 thru 
PJ219.

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
COMPLIANCE
Airplanes under 50,000 flight cycles, accomplish the inspection prior to the airplane accumulating 50,000 flight 
cycles.  Repeat the inspections at 4,500 flight cycle intervals.
Airplanes over 47,750 flight cycles accomplish the inspection within 2,250 flight cycles from release of the 
service bulletin.  Repeat the inspections at 4,500 flight cycle intervals.
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
MATERIAL INFORMATION
None.
Airplanes Total Task Hours Elapsed Hours
All 21.5 7.75
V74566
FORWARD GALLEY DOORWAY
EXAMINE STA 291.5 FRAME
FOR CRACKS AT S-16R

### Page 5

June 13, 2002
737-53A1241
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 5 of 46
 
 
ALERT ALERT
Commercial
Airplane
Group 737
ALERTALERT
Service Bulletin
Number: 737-53A1241
Date: June 13, 2002
ATA System: 5311
SJC
SUBJECT: FUSELAGE - Frames and Bulkheads - Sta 291.5 Frame Inspection at Stringer 16R - 
Forward Galley Door Cutout
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
This service bulletin is for the airplanes shown below.
Airplane models:
737-100 737-200 737-200C 737-300
737-400 737-500
IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER
ACCESSAIR  (CCE)
1 PK936–PK937
AEGEAN CRONUS AIRLINES  (CRM)
1 PM392 PP517 PP929 PS608
PW002 PW157
AER LINGUS  (ARL)
1 PT161–PT168 PW592–PW596
AERGO CAPITAL LIMITED  (CLJ)
1P K 7 7 2 P K 8 2 0
AERIS  (AEY)
1 PM381 PP838 PQ307 PQ345–PQ346

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
AERO CONTINENTE  (COH)
1 PA002 PG041 PG218 PG224
PG305 PG310–PG311 PG574 PJ002–PJ003
PL758
AERO CONTINENTE CHILE  (CCL)
1 PG021 PG219 PG308 PJ102
AERO CONTROLS  (AEO)
1P G 3 1 2
AERO ZAMBIA  (AOZ)
1 PG037 PY001
AEROFLOT  (ARO)
1 PW441–PW450
AEROLINEAS ARGENTINAS  (ARG)
1 PG584–PG585 PH705–PH708 PH741–PH743 PK102–PK103
PK233 PK235 PK735–PK737 PK739
PK747 PK750–PK751 PK755 PK759–PK765
PL712 PY007
AEROPOSTALE  (FPO)
1 PP832 PP913 PQ301 PS642
AEROSERVICE  (SRI)
1 PL742–PL743
AEROSUCRE  (SUS)
1 PY341
AEROSVIT  (UKA)
1 PK564 PQ284
AIGLE AZUR  (AZU)
1 PK215 PL504 PP947
AIR ALGERIE  (ALG)
1 PK361 PK631 PK633–PK634 PL717–PL725
PY051 PY053
AIR ANATOLIA  (TOI)
1P W 2 8 2 P W 2 8 5
AIR AUSTRAL  (AUX)
1 PR096 PS621 PT215
AIR BELGIUM  (ABL)
1P W 5 0 4
AIR BERLIN  (BER)
1 PJ811 PW524 PW528–PW530

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
AIR CANADA  (ACN)
1 PK358 PK671 PK674–PK675 PK677–PK681
PK822 PK881 PK884 PL401–PL417
PL764–PL770 PM141–PM142 PY152–PY154 PY421–PY422
PY441
AIR CARIBBEAN  (XXC)
1 PK096 PK826 PK830
AIR CHINA  (BEJ)
1 PP521–PP522 PQ361–PQ364 PQ367–PQ369 PQ371–PQ373
AIR CHINA INNER MONGOLIAN  (IML)
1 PQ365–PQ366 PQ370 PS614–PS617
AIR EUROPA  (ARE)
1 PP848 PQ226 PR002 PS657
PW031 PW065–PW066 PW265–PW266 PW517
PW851
AIR FRANCE  (AFA)
1 PL503 PN101–PN102 PN106–PN107 PN116
PP902 PP910–PP912 PQ988 PQ990–PQ991
PS604 PS606 PT169–PT170 PT214
PT301–PT306 PT309 PT501–PT514 PU311–PU313
AIR GABON  (GBN)
1 PP836 PW562 PY191
AIR GREAT WALL  (GWA)
1 PM281–PM283
AIR GUINEE  (GNE)
1P Y 6 5 1
AIR INTER CAMEROUN  (ICM)
1P Y 2 7 4
AIR KAZAKSTAN  (KAZ)
1 PG629 PK284 PK528 PK563
PM252
AIR MADAGASCAR  (MAD)
1 PG375 PL793 PQ299
AIR MALAWI  (AML)
1P S 6 0 2
AIR MALTA  (MLT)
1 PL624–PL625 PQ302 PQ306 PQ791–PQ793
PS873–PS874

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
AIR MEDITERRANEE  (AMV)
1 PG028–PG029 PG036 PY101–PY103 PY301
PY344
AIR NAMIBIA  (NAM)
1 PK355 PN492
AIR NAURU  (NAU)
1P W 5 5 6
AIR NEW ZEALAND  (ANZ)
1 PJ117–PJ119 PR009 PR014 PR041
PR045 PR062–PR066 PR077–PR080 PR101
PS651 PS866–PS868
AIR NIPPON  (ANK)
1 PJ817 PT053 PT060 PT063–PT064
PT126 PT129 PT871–PT886 PW026
AIR ONE  (ADH)
1 PK432 PK933 PK938 PM410–PM411
PQ228–PQ229 PQ347–PQ348 PV232–PV233 PV236–PV237
PW041 PW043 PW052 PW054
AIR PHILIPPINES  (PHP)
1 PG001 PG018 PG039 PG047
PG061–PG062 PG066 PK099 PK541–PK542
PM393–PM395
AIR PORTUGAL  (TAP)
1 PP985
AIR SAHARA  (SAQ)
1 PL452 PW061 PW064 PW113–PW114
AIR SENEGAL INTERNATIONAL  (SNG)
1 PK274
AIR SICILIA  (SNL)
1P N 1 0 9
AIR SLOVAKIA  (SLO)
1 PK546
AIR TANZANIA  (TNZ)
1 PP926 PY611–PY612
AIR VANUATU  (VAN)
1P Q 4 5 4
AIR ZIMBABWE  (ZMB)
1 PN431–PN433

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
AIRASIA  (ASW)
1 PM398 PQ448 PQ972
AIRCALIN  (NCI)
1P P 9 1 8
AIRFAST INDONESIA  (PTF)
1 PK562 PN481 PY343
AIRTRAN  (CQT)
1P K 3 0 6 P K 6 9 7
AIRWORK NZ  (ANX)
1P Y 7 4 1
ALASKA AIRLINES  (ASA)
1 PJ301–PJ302 PJ601–PJ615 PW116 PW231–PW252
PY112 PY134–PY135 PY270 PY461–PY463
PY593–PY594
ALOHA AIRLINES  (ALO)
1 PK287 PK694 PK905 PK926
PK934–PK935 PL626 PM251 PM253
PN085 PN473 PN493 PY231
PY242 PY451 PY592 PY595
PY721
ALTER FINANCE  (AFW)
1P K 3 5 9
AMC AVIATION  (AMF)
1P K 2 5 4
AMCUR INVESTMENTS  (MCB)
1P T 2 1 9
AMERICA WEST AIRLINES  (AMW)
1 PL081 PL172 PL551–PL562 PP022
PP029 PP181–PP187 PP189 PP194–PP199
PP383 PP472 PP474–PP475 PP831
PP833–PP834 PP846 PP891 PP893
PP895 PP898–PP899 PP901 PP931–PP934
PP936 PR067 PS666–PS669
AMERICAN FALCON AIR  (FAK)
1 PK464 PL026
AMERICANA  (AMY)
1P G 2 7 6
AMERISTAR AIR CARGO  (CGG)
1 PY345–PY346

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
AMTEC CORPORATION  (CEF)
1 PK549
AN EXPRESS HAVA YOLLARI  (EXB)
1 PY037
ANGOLA AIR CHARTER  (AOH)
1P G 4 3 1
ANSETT AUSTRALIA  (ANS)
1 PP908–PP909 PP914–PP915 PP923 PQ026–PQ041
PS618 PS624
ANSETT WORLDWIDE AVIATION  (AWW)
1 PC003 PP892 PP894 PP896–PP897
PP903 PP920
ANTINEA AIRLINES  (NTI)
1 PY006
ARAMCO ASSOCIATED COMPANY  (RAS)
1 PL151 PY241 PY243
ASIANA AIRLINES  (AAR)
1 PT851–PT853 PV201–PV202 PV204–PV206 PV208
PV226–PV229 PW005 PW008–PW009 PW018–PW020
PW025 PW274 PW278 PW283
PW286 PW289
AUSTRAL - CIELOS DEL SUR  (ALA)
1 PN103–PN104 PN110–PN115 PN117
AVENSA  (AVN)
1 PK042–PK043 PK752
AVIACSA AEROEXO  (AEJ)
1 PK216–PK220 PK625–PK626 PM181
AVIATECA  (AVT)
1 PK222 PL736–PL737 PL740–PL741
AVIOGENEX  (AVG)
1P N 5 0 1
AXON AIRLINES  (AXO)
1P W 0 5 3
BABCOCK & BROWN A/C MANAGEMENT  (BBB)
1 PP845 PQ286
BAHAMASAIR  (BAH)
1 PK672–PK673

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
BASIC CAPITAL MANAGEMENT  (BCM)
1 PN455
BELLVIEW AIRLINES  (BEB)
1 PK203 PK612 PL716
BLUE DART AVIATION  (BDA)
1 PK231–PK232 PL451
BLUE PANORAMA AIRLINES  (BPA)
1 PW284 PW518–PW519 PW522
BLUEBIRD CARGO  (BLS)
1 PM383
BMI BRITISH MIDLAND  (BMA)
1 PQ291–PQ292 PQ971 PQ974–PQ975 PQ996
PT181–PT182 PT186–PT188 PT701–PT703 PW046
PW831
BOEING  (TBC)
1 PG051 PG215
BOEING 22620 HOLDINGS  (BHA)
1 PL745
BOEING CAPITAL CORPORATION  (ZMF)
1P P 8 0 5 P W 0 5 1
BOULLIOUN AVIATION SERVICES  (BOU)
1 PW855–PW856
BOURAQ AIRLINES  (PTB)
1 PK255 PK501 PK913 PK918–PK920
PK931
BRA TRANSPORTES AEREOS  (BRW)
1 PP907 PQ243
BRAATHENS  (BRT)
1 PN451 PT002–PT008 PT010–PT015 PT022–PT025
PT029 PV351 PW573–PW576
BRITISH AIRWAYS  (BAB)
1 PM399 PP841–PP842 PQ283 PQ305
PQ994–PQ995 PQ997 PR003 PR011–PR013
PT001 PT009 PT021 PT183
PT185 PT295 PT307–PT308 PT515–PT516
PW094 PW101–PW102 PW106 PW111–PW112
PW115 PW301–PW302 PW304–PW309 PW312–PW313
PW315–PW327

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
BUSINESS AEROTECH  (BFI)
1P W 0 0 7
C-S AVIATION SERVICES  (CSV)
1P G 2 0 6 P G 3 0 4
CAMEROON AIRLINES  (CAM)
1 PS627 PS872
CASINO EXPRESS AIRLINES  (CIN)
1 PG279 PG436 PN083–PN084 PN086
CAYMAN AIRWAYS  (CAY)
1 PJ009 PK753 PY244
CHANNEL EXPRESS (AIR SERVICES)  (CEX)
1 PQ051–PQ052
CHILEAN AIR FORCE  (CHF)
1P Q 0 5 3 P T 9 9 6
CHINA AVIATION IMPORT/EXPORT  (CSC)
1 PM545
CHINA EASTERN AIRLINES  (CEA)
1 PP509 PQ977 PQ979 PQ981
PR141–PR143
CHINA SOUTHERN AIRLINES  (GUN)
1 PM407–PM409 PM412 PM541–PM544 PM547
PM549 PQ407 PQ479–PQ480 PR121–PR122
PS631 PS836–PS837 PS841–PS846 PT041
PT043–PT048 PT052
CHINA SOUTHWEST AIRLINES  (XIN)
1 PP631–PP634 PQ401–PQ406 PQ408–PQ410 PS811
CHINA UNITED AIRLINES  (CUL)
1 PP728–PP729 PQ288–PQ289 PS609–PS610 PS896–PS897
CHINA XINHUA AIRLINES  (XIH)
1 PM546 PQ264 PQ804–PQ805 PR001
PS856 PW852–PW854
CHINA XINJIANG AIRLINES  (XIJ)
1 PM548
CHINA YUNNAN AIRLINES  (YUN)
1 PP651–PP652 PQ263 PQ411–PQ412 PQ414–PQ418
PS622–PS623 PS628

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ALERT ALERT
 
 
COMAIR  (CML)
1 PG353–PG354 PG356 PK734 PK738
PK744 PK748 PK754 PK758
PK907
CONTINENTAL AIRLINES  (CAL)
1 PA011 PG056 PG621 PG624
PP671–PP699 PP701–PP726 PP730 PP732–PP733
PQ432–PQ438 PT801–PT834 PT901–PT930 PT971–PT973
COPA AIRLINES  (COP)
1 PJ107 PJ112 PK213–PK214 PK465–PK467
PK514–PK515 PK617 PY201
CORSAIR  (COR)
1 PQ224 PW661–PW662
CSA  (CSA)
1 PT617–PT621 PT981–PT985 PV302 PW038–PW039
PW276 PW431–PW435
DEBIS AIRFINANCE  (DEA)
1 PL746
DELTA AIR LINES  (DAL)
1 PK611 PK613 PL221 PN131–PN163
PN401–PN404 PN407–PN420 PP002 PP021
PP023 PP231–PP243 PP473 PP503
PP506 PQ086–PQ087 PQ231–PQ233 PQ236–PQ237
DEUTSCHE BA  (DBA)
1 PR015–PR017 PR021–PR030 PS961–PS963
EASYJET  (EZY)
1 PM382 PP847 PQ221 PQ223
PR161–PR167 PR169–PR172
EASYJET SWITZERLAND  (TEB)
1 PQ225 PQ431 PR168
EG&G TECHNICAL SERVICES  (EGN)
1 PL763
EGYPTAIR  (EGP)
1 PK257–PK258 PT561–PT565
ESTAFETA  (EST)
1 PY056–PY057 PY131
ESTONIAN AIR  (ENA)
1 PT716–PT717

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
ETHIOPIAN AIRLINES  (ETH)
1 PM254 PN512
EURALAIR  (ERA)
1 PV234 PY004
EURO SUN AIRLINES  (EUU)
1 PK756
EUROPE AIRPOST  (EUE)
1 PP392 PP925 PP951–PP952 PQ222
PQ421 PQ771–PQ772 PS607 PS641
PS643–PS644
EUROPEAN AVIATION LIMITED  (EUL)
1 PK044–PK046 PK048–PK050 PK052–PK053 PY272–PY273
PY275
EUROPEAN CAPITAL CORP.  (ECC)
1 PY321
EXECUTIVE JET AIRCRAFT COMPANY  (EXF)
1 PL441
FACTS AIR  (FAD)
1 PX701
FALCON AIR  (FLK)
1 PS636–PS638
FALCON AIR EXPRESS  (FAX)
1 PP801–PP802
FALCONBRIDGE  (NAD)
1 PY002
FAUCETT  (FCT)
1 PC002 PG048
FEDERATIVE REPUBLIC OF BRAZIL  (BRZ)
1 PK068–PK069
FIRST AIR  (BRS)
1 PY132–PY133 PY281
FISCHER AIR  (FIH)
1 PS630 PS871 PS973
FLASH AIRLINES  (HEA)
1P Q 2 9 4 P Q 4 8 1
FLIGHT SERVICES GROUP  (FSG)
1 PS862

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ALERT ALERT
 
 
FRONTIER AIRLINES  (FRO)
1 PK495 PK872–PK873 PL622–PL623 PN105
PN108 PP305 PP471 PP508
PP514 PP516 PQ297 PQ332
PQ341–PQ344 PQ451 PQ487 PQ982
PR005 PR007 PS653
FUTURA  (FUA)
1 PW034–PW035 PW047–PW048 PW118 PW501–PW502
GARUDA INDONESIA  (GIA)
1 PR061 PR068–PR072 PT681–PT685 PV301
PW022 PW028 PW036 PW067
PW272 PW461–PW467 PW525
GB AIRWAYS  (GBA)
1 PP520 PR091–PR092 PS861 PW117
PW119–PW120
GE CAPITAL CORPORATION  (GEF)
1 PG209 PG220–PG221 PG651–PG652 PK026–PK027
PK468 PW273
GENERIC CUSTOMER/SUPPLIER  (XXX)
1 PG217 PN454
GERMANIA  (GER)
1 PQ234–PQ235
GO FLY  (GFL)
1 PM387–PM388 PM391 PP510 PP518
PP840 PP843–PP844 PP916 PQ285
PR004 PS652 PS971 PS974–PS978
GPA GROUP  (GUI)
1P K 2 5 2 P K 2 5 6
GRANDAIR  (GIW)
1P G 2 2 8
GUANGXI AIRLINES  (GUX)
1 PT042 PT049 PT061–PT062
GUND BUSINESS ENTERPRISES  (GUD)
1 PL001
HAINAN AIRLINES  (HNA)
1 PQ473–PQ475 PS611 PS613 PV203
PV356–PV357 PW086–PW088 PW093
HAPAG-LLOYD FLUG  (HAP)
1 PT101–PT105 PW511 PW514

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ALERT ALERT
 
 
HEWA BORA AIRWAYS  (EXD)
1P G 2 7 4
ICELANDAIR  (ICE)
1 PP948 PW564
ILFC  (ILF)
1P Q 2 4 1 P Q 4 4 7
INDIAN AIR FORCE  (IDF)
1 PH712–PH713 PM016–PM017
INDIAN AIRLINES  (IND)
1 PK237–PK240 PM001–PM006 PY631
INTER AIR  (ITI)
1 PY046–PY047
INTERLEASE AVIATION  (ILA)
1P G 3 5 2
INTERNATIONAL AIR LEASES  (IAL)
1 PL803
INTERNATIONAL AIR PARTS  (IAO)
1P G 5 8 0
INTREPID AVIATION  (INL)
1 PL456
IRAN AIR  (IRN)
1 PH731 PK391 PY021–PY022
IRAQI AIRWAYS  (IRQ)
1 PY141–PY142
ISLAMIC REPUBLIC OF PAKISTAN  (PKG)
1 PS612
ISLANDSFLUG  (ISF)
1 PK282 PP352 PP384 PY003
ISRAEL AIRCRAFT INDUSTRIES  (IAI)
1 PG573 PG575 PK692
JAL EXPRESS  (JEX)
1P W 4 1 8
JAPAN AIRLINES  (JAL)
1 PW411–PW417

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
JAPAN TRANSOCEAN AIR  (SWL)
1 PK526–PK527 PN456 PW401–PW408 PW515–PW516
PW520–PW521 PW681–PW683
JAT YUGOSLAV AIRLINES  (JAT)
1 PP771–PP779
JATAYU AIR  (JAJ)
1P G 0 6 8
JET AIRWAYS  (JPL)
1 PV207 PV209 PV271–PV272 PW215–PW216
PW421–PW424
JETSTAR AIRCRAFT SALES  (JTS)
1P G 3 0 6
KENYA AIRWAYS  (KEN)
1 PK641–PK642 PR031–PR034
KG AIRCRAFT LEASING  (KGL)
1P P 9 3 5
KLM - ROYAL DUTCH AIRLINES  (KLM)
1 PP861–PP866 PP868–PP869 PP871–PP877 PW014
PW017 PW611–PW622
KLM UK  (AUK)
1P P 5 1 1 P P 5 1 5
LAB  (LAB)
1 PQ303 PQ951
LAC  (CQC)
1P Y 1 1 3
LACSA  (LAC)
1 PK223 PK357 PK971 PK973
LAM  (LAM)
1 PH703 PK749 PY031
LANCHILE AIRLINES  (LAN)
1 PJ005–PJ006 PJ105–PJ106 PJ109 PK029
PK047 PK212 PK281 PK360
PK431 PK433 PK524–PK525 PK745
PK775 PK825 PK902 PK922–PK923
PK927 PL025 PL028 PY322
LAPA ARGENTINA  (LAZ)
1 PJ110–PJ111 PK051 PK253 PK616
PY361

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
LAUDA AIR  (LAL)
1 PP851–PP852 PW701–PW702
LINA CONGO  (LNA)
1 PJ032 PY411
LINEAS AEREAS AZTECA  (AZX)
1 PP983 PP986
LION AIR  (MLI)
1 PK511
LITHUANIAN AIRLINES  (LIJ)
1 PK632 PL611 PQ304
LORAIR  (LOI)
1P G 2 1 6
LOT POLISH AIRLINES  (LOT)
1 PQ978 PQ980 PT146–PT148 PT651–PT656
PV281–PV287
LUFTHANSA GERMAN AIRLINES  (DLH)
1 PQ054–PQ085 PQ088–PQ092 PS701–PS706 PT331–PT360
LUXAIR  (LUX)
1 PT184 PT671–PT672 PW741–PW742
LUXOR AIR  (LXR)
1P W 5 9 1
MACEDONIAN AIRLINES  (MDA)
1 PW526–PW527 PW771
MAERSK AIR  (MRS)
1 PP519 PT121 PT128 PT130–PT138
MAERSK AIR LIMITED  (MSK)
1 PT123–PT124
MAGIC CARPET AVIATION  (MCI)
1 PP991
MAGNICHARTERS  (MAM)
1 PJ004 PK143 PK145 PL454
MALAYSIA AIRLINES  (MAS)
1 PJ551–PJ561 PW201–PW214 PW217–PW230
MALEV HUNGARIAN AIRLINES  (HGA)
1 PM389 PM396 PM401–PM402 PM404–PM405
PM551 PM555–PM556 PQ298 PW027
PW040 PW268

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
MANDALA AIRLINES  (MND)
1 PK354 PK463 PK614 PK636–PK637
PK874 PK924–PK925 PL027 PL061
PL421 PN002 PW004
MERPATI NUSANTARA AIRLINES  (PNM)
1 PK615 PK623–PK624 PK819 PK917
PK929–PK930
MEXICO'S PRESIDENTIAL AIRCRAFT  (MXG)
1 PC005 PP919
NACIONAL  (NCT)
1 PK111 PK119 PK146 PL455
NATIONWIDE AIR CHARTER  (NWR)
1 PK906 PK928 PK932 PL631–PL632
NIGERIA AIRWAYS  (NIA)
1 PL785 PL788
NORTHROP GRUMMAN CORPORATION  (GRU)
1P G 2 0 8
NORTHSTAR PRESIDIO MANAGEMENT  (INH)
1 PK094–PK095 PY005
OLYMPIC AIRWAYS  (OLY)
1 PK301–PK304 PK307–PK310 PM021–PM023 PR042
PW044 PW062–PW063 PW068 PW072
PW296 PW711–PW717
ORIX AVIATION SYSTEMS  (OXA)
1P T 1 2 5 P T 1 2 7
PACE AIRLINES  (PIE)
1 PG075 PG203 PK221 PP835
PP837 PP867 PP870 PS957
PAKISTAN INT'L AIRLINES  (PIA)
1 PP281–PP286
PANAIR  (PIT)
1P Q 2 8 1 P W 0 9 1
PEGASUS AIRLINES  (PGS)
1 PW010 PW015 PW030 PW032
PW261–PW264
PEGASUS AVIATION GROUP  (PSS)
1P K 7 4 0 P K 7 5 7

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PERUVIAN AIR FORCE  (PRF)
1 PG251 PG253 PN082 PT517
PHARAOH AIRLINES  (PHR)
1P G 0 2 6
PHILIPPINE AIRLINES  (PAL)
1 PM384–PM385 PM390 PM561 PQ803
PQ976 PS601 PW029 PW156
PHILLIPS ALASKA  (ATR)
1 PN452–PN453
PHOENIX AVIATION  (PHX)
1 PG578–PG579
PHUKET AIRLINES  (PHK)
1 PG581–PG582
PLUNA  (PLU)
1 PL201–PL203 PQ287
PREMIER AIRCRAFT MANAGEMENT  (VEG)
1 PS626
QANTAS  (QAN)
1 PQ001–PQ016 PQ293 PW293 PW531–PW550
PW557
QWEST AIR PARTS  (QWE)
1P G 4 3 8
REGION AIR  (RAE)
1 PP393
REGIONAL AIR  (AKN)
1 PK462
REPUBLIC FINANCIAL CORPORATION  (RFC)
1 PG199 PG225 PG433 PG502–PG503
PG622 PG704
REPUBLIC OF INDONESIA  (IDO)
1 PL601–PL603
REPUBLIC OF KOREA AIR FORCE  (KAF)
1 PP221
REPUBLIC OF NIGER  (NIR)
1 PY166

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
RIO-SUL  (ROS)
1 PP839 PP921 PP927 PS603
PT050–PT051 PT054–PT055 PT058–PT059 PT211–PT213
PT216–PT218 PT220 PT721–PT725 PT854
PU301
ROYAL AIR MAROC  (RAM)
1 PK271–PK273 PT581–PT586 PW631–PW637 PY671–PY672
ROYAL AIRLINES  (ROY)
1 PK545 PY303–PY304
ROYAL AIRWAYS  (ROJ)
1P W 0 2 4
ROYAL THAI AIR FORCE  (TAF)
1P K 5 1 9 P V 2 9 6
RYAN INTERNATIONAL AIRLINES  (RYN)
1P K 0 9 7 P K 5 4 3
RYANAIR  (RYR)
1 PJ114–PJ115 PK502–PK504 PK801–PK804 PK821
PK824 PK901 PK903 PK911–PK912
PK914–PK916 PK921 PK974 PN001
SABENA  (SAB)
1 PP961–PP967 PS654 PT612–PT613 PT615–PT616
PW503 PW761
SAFAIR  (SFA)
1 PW303 PW310–PW311 PW314
SAMCO AVIATION  (SMO)
1 PL581
SAT AIRLINES  (SKH)
1P G 2 1 4 P J 0 0 1
SATA AIR ACORES  (SAP)
1 PP391 PQ992 PW012
SAUDI ARABIAN AIRLINES  (SVA)
1 PK312–PK317 PL726–PL735 PY036
SAUDI ROYAL FLIGHT  (SRF)
1P K 3 1 8
SHANDONG AIRLINES  (SHG)
1 PM413–PM414 PP825–PP826 PQ391–PQ395
SHANTOU AIRLINES  (SHT)
1 PM415–PM417

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
SHEIKH MUSTAFA EDREES  (SME)
1 PL505
SHENZHEN AIRLINES  (SHZ)
1 PQ486 PS629 PS691–PS692 PS851–PS852
SIERRA PACIFIC AIRLINES  (SRP)
1 PK627 PL621
SKY AIRLINES  (SYC)
1 PV235 PW001
SKY KING  (SKN)
1 PG059 PK351–PK353 PK696
SKYLINE NEPC  (DAI)
1P H 0 2 1
SKYWAYS  (SKQ)
1P G 3 0 7
SOBELAIR  (SBL)
1P W 5 6 1
SOUTH AFRICAN AIRWAYS  (SAA)
1 PK731–PK733 PK742–PK743 PK746 PK771
PK774 PK776 PK904 PL101–PL113
SOUTHERN AIRCRAFT SERVICES  (HUZ)
1 PL471
SOUTHWEST AIRLINES  (SWA)
1 PK082 PK548 PK550–PK560 PK621
PK628–PK630 PM051–PM066 PP101–PP169 PP188
PP190–PP193 PP201–PP205 PP301–PP304 PP351
PP353 PP376–PP382 PP402–PP403 PP501–PP502
PP727 PP731 PP803–PP804 PP821–PP824
PP827 PS751–PS799 PS901–PS941 PU001–PU025
SPORTS JET  (TSO)
1P W 5 6 3
STAR AIR  (SRH)
1 PK777 PL744
SUDAN AIRWAYS  (SUD)
1 PY156
TAAG (ANGOLA AIRLINES)  (ANG)
1 PK661 PK664–PK666 PY162

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
TACA INTERNATIONAL AIRLINES  (TAC)
1 PJ007–PJ008 PK823 PK882 PL501
PL506
TACA PERU  (TNM)
1P K 8 7 1
TAF AEREAS LINHAS  (TFL)
1P Y 3 2 3
TANS  (TAX)
1P G 3 5 1
TAROM - ROMANIAN AIR TRANSPORT  (TRM)
1 PQ931–PQ935 PR010 PS956
THAI AIRWAYS INTERNATIONAL  (TII)
1 PW161–PW171
THE PEGASUS AVIATION COMPANY  (PEG)
1P K 2 8 5 P K 8 2 7
TITAN AIRWAYS  (TIU)
1P S 6 2 0
TRANSAERO AIRLINES  (TRX)
1 PK451–PK452 PK773 PK779
TRANSAVIA AIRLINES  (TAV)
1 PP806–PP808
TRANSBRASIL  (TBL)
1 PP507 PP904 PP981–PP982 PQ230
PQ242 PS605
TRANSMILE AIR SERVICES  (TML)
1 PN472 PN474 PY151 PY342
PY381
TRAVEL SERVIS  (TSF)
1P W 0 0 6 P W 0 4 2
TRITON AVIATION SERVICES  (TIA)
1 PJ101 PJ103 PL502 PW092
TUNINTER  (TUI)
1 PM397
TUNISAIR  (TUN)
1 PK861–PK863 PT641–PT644 PY621

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
TURKISH AIRLINES (THY)  (THY)
1 PM552–PM554 PM557 PM559–PM560 PM562–PM564
PT056–PT057 PW045 PW049–PW050 PW281
PW287 PW290–PW291
TURKMENISTAN AIRLINES  (TUE)
1 PQ265 PQ801–PQ802
TYCO CAPITAL AEROSPACE  (TCI)
1 PG074 PP504–PP505 PT614
UKRAINE INTERNATIONAL AIRLINES  (UKR)
1 PK635 PN405 PR181 PT611
UNITED AIRLINES  (UAL)
1 PG024 PG052 PG054–PG055 PG057
PG067 PG069–PG071 PK201–PK202 PL002–PL023
PQ101–PQ199 PQ201–PQ202 PT381–PT399 PT401–PT438
US AIRWAYS  (USA)
1 PG474 PK288 PK591–PK599 PK601–PK606
PK608–PK610 PK883 PM101–PM119 PN021–PN043
PP001 PP003–PP010 PP012–PP020 PP024–PP028
PP030–PP032 PP034–PP054 PP401 PP404–PP440
PV001–PV010 PV012–PV055
VANGUARD AIRLINES  (VAG)
1 PG210 PK695 PK908–PK910 PN491
VARIG AIRLINES  (VAR)
1 PK112–PK114 PK116 PK118 PK120
PK144 PK211 PK561 PL453
PP905–PP906 PP917 PP922 PP946
PP987–PP990 PQ227 PQ251–PQ262 PQ266–PQ267
PQ290 PQ331 PQ983 PQ985–PQ987
PR006 PR008 PR043–PR044 PR132
PS619 PW016 PW021 PW023
PW037
VASP AIRLINES  (VSP)
1 PG435 PG437 PG439–PG440 PG471–PG473
PH011–PH013 PK061–PK062 PK065–PK067 PK291
PK356 PK521 PK523 PK581
PL756 PP512–PP513 PP984 PS863
PX071 PY286
VIRGIN BLUE  (VOZ)
1 PJ816 PP924 PW011 PW267
PW271 PW275 PW288

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
VIRGIN EXPRESS AIRLINES  (EBA)
1 PP928 PP930 PQ984 PQ989
PQ993 PS625 PS655–PS656 PS972
PV231 PW013 PW033 PW571–PW572
VOLVO AERO SERVICES (SHANNON)  (SLM)
1 PG204 PG278
WESTAIR  (WSA)
1P K 0 4 1
WESTJET  (WJI)
1 PJ031 PJ071 PJ108 PJ113
PK092–PK093 PK241 PK283 PK305
PK544 PK547 PK565 PK622
PK691 PK711–PK716 PL171 PL761–PL762
WHITE EAGLE AVIATION  (WEG)
1 PW512–PW513
WUHAN AIRLINES  (WUH)
1 PQ472 PQ491–PQ492 PR081–PR082 PR131
XIAMEN AIRLINES  (XIA)
1 PM255 PN521 PQ295–PQ296 PQ471
PQ493 PT026–PT028 PT030–PT031
YEMENIA  (YEM)
1 PK341 PY409–PY410
IDENTIFICATION BY VARIABLE NUMBER
Variable  Group
PA001–PA022 1
PA099 1
PA231–PA232 1
PC001–PC005 1
PG001–PG075 1
PG199 1
PG201–PG230 1
PG251–PG255 1
PG271–PG279 1
PG301–PG314 1
PG331–PG332 1
PG351–PG356 1
PG375 1
PG401–PG403 1
PG431–PG442 1

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PG471–PG475 1
PG501–PG505 1
PG571–PG586 1
PG621–PG630 1
PG651–PG652 1
PG701–PG705 1
PH001 1
PH011–PH013 1
PH021–PH024 1
PH701–PH715 1
PH731–PH732 1
PH741–PH743 1
PJ001–PJ009 1
PJ031–PJ032 1
PJ071–PJ072 1
PJ101–PJ119 1
PJ301–PJ302 1
PJ551–PJ561 1
PJ601–PJ615 1
PJ811 1
PJ816–PJ817 1
PK026–PK029 1
PK041–PK053 1
PK061–PK070 1
PK081–PK082 1
PK091–PK099 1
PK101–PK103 1
PK111–PK120 1
PK141–PK146 1
PK201–PK204 1
PK211–PK223 1
PK231–PK241 1
PK251–PK258 1
PK271–PK274 1
PK281–PK289 1
PK291 1
PK301–PK318 1
PK341 1
PK351–PK361 1
Variable  Group

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PK391 1
PK431–PK433 1
PK451–PK452 1
PK461–PK469 1
PK495 1
PK501–PK504 1
PK511–PK515 1
PK519 1
PK521–PK528 1
PK541–PK565 1
PK581 1
PK591–PK599 1
PK601–PK617 1
PK621–PK637 1
PK641–PK642 1
PK661–PK666 1
PK671–PK681 1
PK691–PK697 1
PK711–PK716 1
PK731–PK765 1
PK771–PK779 1
PK801–PK804 1
PK819–PK827 1
PK830 1
PK861–PK863 1
PK871–PK874 1
PK881–PK884 1
PK901–PK938 1
PK971–PK974 1
PL001–PL028 1
PL061 1
PL081 1
PL101–PL113 1
PL151 1
PL171–PL172 1
PL201–PL203 1
PL221 1
PL401–PL417 1
PL421 1
Variable  Group

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PL441 1
PL451–PL456 1
PL471 1
PL491 1
PL501–PL506 1
PL551–PL562 1
PL581 1
PL601–PL603 1
PL611 1
PL621–PL626 1
PL631–PL632 1
PL711–PL712 1
PL716–PL747 1
PL756 1
PL758 1
PL761–PL770 1
PL781–PL788 1
PL793 1
PL801–PL803 1
PM001–PM006 1
PM016–PM017 1
PM021–PM023 1
PM051–PM066 1
PM101–PM119 1
PM141–PM142 1
PM171 1
PM181 1
PM251–PM255 1
PM281–PM283 1
PM381–PM399 1
PM401–PM417 1
PM541–PM564 1
PN001–PN002 1
PN021–PN043 1
PN081–PN086 1
PN101–PN117 1
PN131–PN163 1
PN401–PN420 1
PN431–PN433 1
Variable  Group

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PN451–PN456 1
PN471–PN474 1
PN481 1
PN491–PN493 1
PN501–PN502 1
PN511–PN512 1
PN521 1
PP001–PP054 1
PP101–PP169 1
PP181–PP199 1
PP201–PP205 1
PP221 1
PP231–PP243 1
PP281–PP286 1
PP301–PP305 1
PP351–PP353 1
PP376–PP384 1
PP391–PP393 1
PP401–PP440 1
PP471–PP475 1
PP501–PP522 1
PP631–PP634 1
PP651–PP652 1
PP671–PP699 1
PP701–PP733 1
PP771–PP779 1
PP801–PP808 1
PP821–PP827 1
PP831–PP848 1
PP851–PP852 1
PP861–PP877 1
PP891–PP899 1
PP901–PP936 1
PP946–PP948 1
PP951–PP952 1
PP961–PP967 1
PP981–PP991 1
PP993 1
PQ001–PQ016 1
Variable  Group

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PQ026–PQ041 1
PQ051–PQ092 1
PQ101–PQ199 1
PQ201–PQ202 1
PQ221–PQ237 1
PQ241–PQ243 1
PQ251–PQ267 1
PQ281–PQ299 1
PQ301–PQ307 1
PQ331–PQ332 1
PQ341–PQ348 1
PQ361–PQ373 1
PQ391–PQ395 1
PQ401–PQ418 1
PQ421 1
PQ431–PQ438 1
PQ447–PQ448 1
PQ451 1
PQ454 1
PQ471–PQ475 1
PQ479–PQ481 1
PQ486–PQ487 1
PQ491–PQ493 1
PQ771–PQ772 1
PQ791–PQ793 1
PQ801–PQ805 1
PQ931–PQ935 1
PQ951 1
PQ971–PQ997 1
PR001–PR017 1
PR021–PR034 1
PR041–PR045 1
PR061–PR072 1
PR077–PR082 1
PR091–PR092 1
PR096 1
PR101 1
PR121–PR122 1
PR131–PR132 1
Variable  Group

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PR141–PR143 1
PR161–PR172 1
PR181 1
PS601–PS631 1
PS636–PS638 1
PS641–PS644 1
PS651–PS657 1
PS666–PS669 1
PS691–PS692 1
PS701–PS706 1
PS751–PS799 1
PS811 1
PS836–PS837 1
PS841–PS846 1
PS851–PS852 1
PS856 1
PS861–PS863 1
PS866–PS868 1
PS871–PS874 1
PS896–PS897 1
PS901–PS941 1
PS956–PS957 1
PS961–PS963 1
PS971–PS978 1
PT001–PT015 1
PT021–PT031 1
PT041–PT064 1
PT101–PT105 1
PT121–PT138 1
PT146–PT148 1
PT161–PT170 1
PT181–PT188 1
PT211–PT220 1
PT295 1
PT301–PT309 1
PT331–PT360 1
PT381–PT399 1
PT401–PT438 1
PT501–PT517 1
Variable  Group

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PT561–PT565 1
PT581–PT586 1
PT611–PT621 1
PT641–PT644 1
PT651–PT656 1
PT671–PT672 1
PT681–PT685 1
PT701–PT703 1
PT716–PT717 1
PT721–PT725 1
PT801–PT834 1
PT851–PT854 1
PT871–PT886 1
PT901–PT930 1
PT971–PT973 1
PT981–PT985 1
PT996 1
PU001–PU025 1
PU301 1
PU311–PU313 1
PV001–PV055 1
PV201–PV209 1
PV226–PV229 1
PV231–PV237 1
PV271–PV272 1
PV281–PV287 1
PV296 1
PV301–PV302 1
PV351 1
PV356–PV357 1
PW001–PW054 1
PW061–PW068 1
PW072 1
PW086–PW088 1
PW091–PW094 1
PW101–PW102 1
PW106 1
PW111–PW120 1
PW156–PW157 1
Variable  Group

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PW161–PW171 1
PW201–PW252 1
PW261–PW268 1
PW271–PW276 1
PW278 1
PW281–PW293 1
PW296 1
PW301–PW327 1
PW401–PW408 1
PW411–PW418 1
PW421–PW424 1
PW431–PW435 1
PW441–PW450 1
PW461–PW467 1
PW501–PW504 1
PW511–PW522 1
PW524–PW550 1
PW556–PW557 1
PW561–PW564 1
PW571–PW576 1
PW591–PW596 1
PW611–PW622 1
PW631–PW637 1
PW661–PW662 1
PW681–PW683 1
PW701–PW702 1
PW711–PW717 1
PW741–PW742 1
PW761 1
PW771 1
PW831 1
PW851–PW856 1
PX071 1
PX701 1
PY001–PY008 1
PY021–PY022 1
PY031 1
PY036–PY037 1
PY046–PY048 1
Variable  Group

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
PY051–PY053 1
PY056–PY057 1
PY101–PY103 1
PY111–PY113 1
PY131–PY135 1
PY141–PY143 1
PY151–PY154 1
PY156–PY157 1
PY161–PY162 1
PY166 1
PY191 1
PY201 1
PY221–PY222 1
PY231 1
PY241–PY244 1
PY270–PY275 1
PY281 1
PY286 1
PY301–PY304 1
PY321–PY323 1
PY341–PY346 1
PY361–PY362 1
PY381 1
PY401 1
PY409–PY411 1
PY421–PY422 1
PY441 1
PY451 1
PY461–PY463 1
PY591–PY595 1
PY611–PY612 1
PY621 1
PY631 1
PY651 1
PY671–PY672 1
PY721 1
PY741 1
Variable  Group

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BOEING SERVICE BULLETIN 737-53A1241
ALERT ALERT
 
 
2. Spares Affected
None.
B. Concurrent Requirements
None.
C. Reason
Boeing has received a report of one crack on a 737-200 airplane on the Sta 291.5 frame near the 
forward galley door cutout.  The airplane had accumulated 66,043 flight cycles and 45,989 flight hours.  
The Sta 291.5 frame is a body frame forward of the forward galley door cutout.  The crack was found 
from the aft side of the frame web at the cutout for the doorstop intercostal strap at stringer 16R.
Undetected or remaining cracks in the frame will propagate by normal fatigue due to cyclic cabin 
pressure loading.  Continued operation with undetected cracks could lead to a severed frame.  Loss 
of the frame would render the doorstops ineffective and result in a possible rapid decompression and 
potential separation of the forward galley door from the airplane.
This service bulletin gives instructions to do an inspection of  the Sta 291.5 frame for cracks at Stringer 
16R.   Accomplishment of this service bulletin will prevent a possible rapid decompression and 
potential separation of the forward galley door from the airplane.
Boeing Service Related Problem (SRP) 737-SRP-53-0149 is related to this service bulletin.
D. Description
Get access to the aft side of the Sta 291.5 frame at stringer 16R.  Do an eddy current inspection of  
the frame web around the cutout for the doorstop intercostal strap at stringer 16R.
E. Compliance
Airplanes under 50,000 flight cycles, accomplish the inspection prior to the airplane accumulating 
50,000 flight cycles.  Repeat the inspections at 4,500 flight cycle intervals.
Airplanes over 47,750 flight cycles accomplish the inspection within 2,250 flight cycles from release 
of the service bulletin.  Repeat the inspections at 4,500 flight cycle intervals.
F. Approval
This service bulletin was examined by the Federal Aviation Administration (FAA).  The changes 
specified in this service bulletin comply with the applicable Federal Aviation Regulations (FAR) and 
are FAA approved.  This service bulletin and the FAA approval were based on the airplane in its 
original Boeing delivery configuration or as modified by other FAA approved Boeing changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected 
by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency 
approval before incorporating this service bulletin.

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G. Manpower
The table below shows an estimate of the task-hours necessary to do this inspection for each airplane.  
This estimate is for direct labor only, done by an experienced crew.  Adjust the estimate with operator 
task-hour data if necessary.  The estimate does not include lost time.  These are some examples of 
lost time:
— Time to adjust to the workplace
— Time to schedule the work
— Time to examine the work
— Time to cure the materials
— Time to make the parts
— Time to find the tools.
H. Weight and Balance Changes
Not applicable.  This service bulletin covers inspection only.
I. Electrical Load Data
Not changed.
J. References
1. Existing Data:
a. Service Related Problem (SRP) 737-SRP-53-0149
b. 737 Maintenance Manual (AMM) Subject 25-21-01, 25-21-35, 25-21-71, 25-31-53, and 25-
31-83.
c. 737 Nondestructive Test (NDT) Manual D6-37239, Part 6, Subject 51-00-00, Figure 4.
d. Boeing Parts Standards Document D-590
e. Boeing Drawing  65-88700 
2. Data supplied with this Service Bulletin:
None.
Task
Number of 
Persons Task-Hours Elapsed Hours
Open Access 3 8.5 3.0
Examine 2 2.0 1.0
Close Access 3 11.0 3.75
TOTAL FOR EACH AIRPLANE 21.5 7.75

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3. Installation Drawings Used in the Preparation of this Service Bulletin:
This drawing was used to prepare this service bulletin.  This drawing is not necessary to make 
the specified changes, and is not supplied with this service bulletin.  This drawing may not be 
applicable to all airplane configurations or operators.
K. Publications Affected
None.
L. Interchangeability and Intermixability of Parts
Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts.
Drawing Number Title
65-45807 FRAME INSTL - FWD GALLEY DOOR STA 291.5

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2. MATERIAL INFORMATION
A. Material - Price and Availability
None.
B. 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.
C. Parts Necessary For Each Airplane
1. Kits:
None.
2. Parts and Materials Supplied by the Operator:
None.
3. Parts Modified and Reidentified:
None.
4. Parts Removed and Not Replaced:
None.
D. Parts Necessary to Change Spares
None.
E. Special Tooling - Price and Availability
None.
F. Special Tooling Necessary to do this Service Bulletin
No special tools or equipment are necessary to do the change in this service bulletin.  But, 
maintenance and overhaul tools in the manuals given in Paragraph 1.J., References, can be 
necessary.  Examine operator tool supply to make sure all necessary tools are available.

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3. ACCOMPLISHMENT INSTRUCTIONS
A. GENERAL INFORMATION
Note:
1. Manual titles are referred to by acronyms.  Refer to Paragraph 1.J., References, for 
definition of the acronyms.
2. Obey all of the warnings and cautions given in the specified manual sections.
3. Visual Detailed Inspection:  An intensive examination of a specific item, installation or 
assembly to detect damage, failure or irregularity.  Available lighting is normally 
supplemented with a direct source of good lighting at an intensity deemed appropriate.  
Inspection aids such as mirrors, magnifying lenses, etc. may be necessary.  Surface 
cleaning and elaborate access procedures may be required.
4. Unless shown differently, these dimensions and tolerances are used:
— Linear dimensions are in inches
— Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus or 
minus 0.03 inch.
— Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch
— Angular tolerance is plus or minus 2 degrees
— Hole dimensions for standard solid rivets are given in 737 Structural Repair Manual, 
Chapter 51
— Torque limits to tighten nuts and bolts are given in 737 Structural Repair Manual, 
Chapter 51.
B. WORK INSTRUCTIONS
1. Gain access to the body frame at Sta 291.5 stringer 16R.   Remove, as needed, the No. 1 forward 
galley (refer to AMM 25-31-53); the forward galley header (refer to AMM 25-31-83); the lowered 
ceiling panels (refer to AMM 25-21-71); the forward galley doorway sidewall lining panels (refer 
to AMM 25-21-35); and the sidewall lining insulation (refer to AMM 25-21-01).  
2. Do a visual detailed inspection and an eddy current inspection of the intercostal strap cutout from 
the aft side of the frame web at stringer 16R, as specified in Figure 1.   If cracks are found notify 
Boeing for repair instructions.  If no cracks are found repeat the inspections at the intervals 
specified in Section 1.E. Compliance. 
3. Put the airplane back to a serviceable condition.

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FIGURE 1:  FRAME WEB INSPECTION
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FIGURE 1:  FRAME WEB INSPECTION
The step numbers shown below agree with the numbers shown in the circle symbols in the figure.
STEP TASK NAME/PROCEDURE REFERENCES NOTES
1
Examine Frame Web/Visual Detailed - (a)
Frame Web/Eddy Current 737 NDT, Part 6, Subject 
51-00-00, Figure 4.
(a) Do a visual detailed and eddy current inspection of the web around the slotted hole cutout from the aft side of the Sta 291.5 frame.
A
A
A-A
INBD
1
V74456
FORWARD GALLEY
DOORWAY
INBD
FWD
291.5
STA
S-16R
(SHEET 1 OF 1)

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Table of Contents
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BOEING SERVICE BULLETIN 737-53A1241
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Table of Contents
Summary .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 3
1. PLANNING INFORMATION .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 5
A. Effectivity .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 5
1. Airplanes   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 5
2. Spares Affected .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  35
B. Concurrent Requirements  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   .  35
C. Reason .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  35
D. Description .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  35
E. Compliance.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   .  .  .  .  35
F. Approval .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  35
G. Manpower   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   .  .  .  .  36
H. Weight and Balance Changes  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  36
I. Electrical Load Data  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   .  .  .  36
J. References .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   .  .  .  .  36
1. Existing Data: .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  36
2. Data supplied with this Service Bulletin:   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  36
3. Installation Drawings Used in the Preparation of this Service Bulletin: .  .  .  .  .  .  .  .  .  .  37
K. Publications Affected .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  37
L. Interchangeability and Intermixability of Parts  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  37
2. MATERIAL INFORMATION .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  39
A. Material - Price and Availability.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  39
B. Industry Support Information .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   .  39
C. Parts Necessary For Each Airplane  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  39
1. Kits: .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  39
2. Parts and Materials Supplied by the Operator:  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  39
3. Parts Modified and Reidentified:   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  39
4. Parts Removed and Not Replaced: .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  39
D. Parts Necessary to Change Spares  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  39
E. Special Tooling - Price and Availability.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   39
F. Special Tooling Necessary to do this Service Bulletin .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  39
3. ACCOMPLISHMENT INSTRUCTIONS .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  41
A. GENERAL INFORMATION   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  41
B. WORK INSTRUCTIONS .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  41
FIGURE 1: FRAME WEB INSPECTION   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  42

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ALERT ALERT
Commercial
Airplane
Group 737
ALERTALERT
Service Bulletin
Number: 737-53A1241 Evaluation Form
Date: June 13, 2002
ATA System: 5311
SJC
SUBJECT: FUSELAGE - Frames and Bulkheads - Sta 291.5 Frame Inspection at Stringer 16R - 
Forward Galley Door Cutout
Use this evaluation form to tell us what you think of the quality of this service bulletin.  We will use the data that 
you give us to improve the quality of our service bulletins.
Note: Please do not use this evaluation form to tell us to make changes to your manuals.  To make these 
changes, please use a Publication Change Request (PCR) form. 
Please give us this data:  
(If necessary, please use the other side.  Thank you for the time you used to give us your comments.)
OPERATOR: ______________________________________   TODAY’S DATE:_______________________
PREPARED BY:  ___________________________________   TITLE:  ______________________________
ORGANIZATION:  __________________________________   TELEX CODE:  ________________________
TELEPHONE NUMBER:  _____________________________  BASE:  ______________________________
Please rate the quality of this service bulletin:     (good)  4   3   2   1  (poor)
Please rate the quality of the illustrations:           (good)  4   3   2   1  (poor)
Will you do the change given by this service bulletin?   Yes___  No___  If not, please explain:
Is this service bulletin easy to understand?                    Yes___  No___  If not, please explain:
Is this service bulletin easy to use?                                  Yes___  No___  If not, please explain:
Are the Planning Information, Material Information, and
Accomplishment Instructions accurate?                         Yes___  No___  If not, please explain:
Is the Manpower estimate accurate?                              Yes___  No___  If not, please explain:
Give the completed evaluation form to your Boeing Field Service Representative or send the evaluation form 
directly to this address:
Manager, Service Bulletin Engineering
Boeing Commercial Airplanes Group
P.O. Box 3707, Mail Code 2H-36
Seattle, WA   98124-2207

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