June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 1 of 46 ALERT ALERT 

### Commercial Airplane Group 

# 737

ALERT ALERT 

# 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## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2002 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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document unless provided in writing by Boeing.BLANK PAGE June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 2 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT

BLANK PAGEJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 3 of 46 ALERT ALERT 

### Commercial Airplane Group 

# 737

ALERT ALERT 

# 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.June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 4 of 46 

### 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 7.75V74566 

### FORWARD GALLEY DOORWAY

EXAMINE STA 291.5 FRAME FOR CRACKS AT S-16RJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 5 of 46 ALERT ALERT 

### Commercial Airplane Group 

# 737

ALERT ALERT 

# 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) 1 PK772 PK820 AERIS (AEY) 1 PM381 PP838 PQ307 PQ345–PQ346June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 6 of 46 

### 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) 1 PG312 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) 1 PW282 PW285 AIR AUSTRAL (AUX) 1 PR096 PS621 PT215 AIR BELGIUM (ABL) 1 PW504 AIR BERLIN (BER) 1 PJ811 PW524 PW528–PW530June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 46 

### 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) 1 PY651 AIR INTER CAMEROUN (ICM) 1 PY274 AIR KAZAKSTAN (KAZ) 1 PG629 PK284 PK528 PK563 PM252 AIR MADAGASCAR (MAD) 1 PG375 PL793 PQ299 AIR MALAWI (AML) 1 PS602 AIR MALTA (MLT) 1 PL624–PL625 PQ302 PQ306 PQ791–PQ793 PS873–PS874June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 8 of 46 

### 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) 1 PW556 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) 1 PN109 AIR SLOVAKIA (SLO) 1 PK546 AIR TANZANIA (TNZ) 1 PP926 PY611–PY612 AIR VANUATU (VAN) 1 PQ454 AIR ZIMBABWE (ZMB) 1 PN431–PN433June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT AIRASIA (ASW) 1 PM398 PQ448 PQ972 AIRCALIN (NCI) 1 PP918 AIRFAST INDONESIA (PTF) 1 PK562 PN481 PY343 AIRTRAN (CQT) 1 PK306 PK697 AIRWORK NZ (ANX) 1 PY741 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) 1 PK359 AMC AVIATION (AMF) 1 PK254 AMCUR INVESTMENTS (MCB) 1 PT219 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) 1 PG276 AMERISTAR AIR CARGO (CGG) 1 PY345–PY346June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 10 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT AMTEC CORPORATION (CEF) 1 PK549 AN EXPRESS HAVA YOLLARI (EXB) 1 PY037 ANGOLA AIR CHARTER (AOH) 1 PG431 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) 1 PN501 AXON AIRLINES (AXO) 1 PW053 BABCOCK & BROWN A/C MANAGEMENT (BBB) 1 PP845 PQ286 BAHAMASAIR (BAH) 1 PK672–PK673June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 11 of 46 

### 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) 1 PP805 PW051 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–PW327June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 12 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT BUSINESS AEROTECH (BFI) 1 PW007 C-S AVIATION SERVICES (CSV) 1 PG206 PG304 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) 1 PQ053 PT996 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 PS628June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 13 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 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–PT717June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 14 of 46 

### 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) 1 PQ294 PQ481 FLIGHT SERVICES GROUP (FSG) 1 PS862June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 15 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 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) 1 PK252 PK256 GRANDAIR (GIW) 1 PG228 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 PW514June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 16 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT HEWA BORA AIRWAYS (EXD) 1 PG274 ICELANDAIR (ICE) 1 PP948 PW564 ILFC (ILF) 1 PQ241 PQ447 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) 1 PG352 INTERNATIONAL AIR LEASES (IAL) 1 PL803 INTERNATIONAL AIR PARTS (IAO) 1 PG580 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) 1 PW418 JAPAN AIRLINES (JAL) 1 PW411–PW417June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 17 of 46 

### 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) 1 PG068 JET AIRWAYS (JPL) 1 PV207 PV209 PV271–PV272 PW215–PW216 PW421–PW424 JETSTAR AIRCRAFT SALES (JTS) 1 PG306 KENYA AIRWAYS (KEN) 1 PK641–PK642 PR031–PR034 KG AIRCRAFT LEASING (KGL) 1 PP935 KLM - ROYAL DUTCH AIRLINES (KLM) 1 PP861–PP866 PP868–PP869 PP871–PP877 PW014 PW017 PW611–PW622 KLM UK (AUK) 1 PP511 PP515 LAB (LAB) 1 PQ303 PQ951 LAC (CQC) 1 PY113 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 PY361June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 18 of 46 

### 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) 1 PG216 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) 1 PW591 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 PW268June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 19 of 46 

### 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) 1 PG208 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) 1 PT125 PT127 PACE AIRLINES (PIE) 1 PG075 PG203 PK221 PP835 PP837 PP867 PP870 PS957 PAKISTAN INT'L AIRLINES (PIA) 1 PP281–PP286 PANAIR (PIT) 1 PQ281 PW091 PEGASUS AIRLINES (PGS) 1 PW010 PW015 PW030 PW032 PW261–PW264 PEGASUS AVIATION GROUP (PSS) 1 PK740 PK757June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 20 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT PERUVIAN AIR FORCE (PRF) 1 PG251 PG253 PN082 PT517 PHARAOH AIRLINES (PHR) 1 PG026 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) 1 PG438 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 PY166June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 21 of 46 

### 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) 1 PW024 ROYAL THAI AIR FORCE (TAF) 1 PK519 PV296 RYAN INTERNATIONAL AIRLINES (RYN) 1 PK097 PK543 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) 1 PG214 PJ001 SATA AIR ACORES (SAP) 1 PP391 PQ992 PW012 SAUDI ARABIAN AIRLINES (SVA) 1 PK312–PK317 PL726–PL735 PY036 SAUDI ROYAL FLIGHT (SRF) 1 PK318 SHANDONG AIRLINES (SHG) 1 PM413–PM414 PP825–PP826 PQ391–PQ395 SHANTOU AIRLINES (SHT) 1 PM415–PM417June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 22 of 46 

### 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) 1 PH021 SKYWAYS (SKQ) 1 PG307 SOBELAIR (SBL) 1 PW561 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) 1 PW563 STAR AIR (SRH) 1 PK777 PL744 SUDAN AIRWAYS (SUD) 1 PY156 TAAG (ANGOLA AIRLINES) (ANG) 1 PK661 PK664–PK666 PY162June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 23 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT TACA INTERNATIONAL AIRLINES (TAC) 1 PJ007–PJ008 PK823 PK882 PL501 PL506 TACA PERU (TNM) 1 PK871 TAF AEREAS LINHAS (TFL) 1 PY323 TANS (TAX) 1 PG351 TAROM - ROMANIAN AIR TRANSPORT (TRM) 1 PQ931–PQ935 PR010 PS956 THAI AIRWAYS INTERNATIONAL (TII) 1 PW161–PW171 THE PEGASUS AVIATION COMPANY (PEG) 1 PK285 PK827 TITAN AIRWAYS (TIU) 1 PS620 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) 1 PW006 PW042 TRITON AVIATION SERVICES (TIA) 1 PJ101 PJ103 PL502 PW092 TUNINTER (TUI) 1 PM397 TUNISAIR (TUN) 1 PK861–PK863 PT641–PT644 PY621June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 24 of 46 

### 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 PW288June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 25 of 46 

### 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) 1 PK041 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 1June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 26 of 46 

### 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 GroupJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 27 of 46 

### 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 GroupJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 28 of 46 

### 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 GroupJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 29 of 46 

### 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 GroupJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 30 of 46 

### 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 GroupJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 31 of 46 

### 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 GroupJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 32 of 46 

### 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 GroupJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 33 of 46 

### 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 GroupJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 34 of 46 

### 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 GroupJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 35 of 46 

### 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.June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 36 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT 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 7.75June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 37 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT

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 291.5June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 38 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT

BLANK PAGEJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 39 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT

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.June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 40 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT

BLANK PAGEJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 41 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT

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.FIGURE 1: FRAME WEB INSPECTION June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 42 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT

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 1V74456 FORWARD GALLEY DOORWAY

INBD FWD 291.5 STA

S-16R

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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42BLANK PAGE June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 44 of 46 

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BLANK PAGEJune 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 45 of 46 ALERT ALERT 

### Commercial Airplane Group 

# 737

ALERT ALERT 

# 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 98124-2207June 13, 2002 737-53A1241 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 46 of 46 

### BOEING SERVICE BULLETIN 737-53A1241 ALERT ALERT