April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 1 of 38 

### Commercial Airplane Group 

# 737

SPECIAL ATTENTION 

# Service Bulletin

Number: 737-78-1074 Date: April 07, 2005 Revision 1 September 15, 2005 ATA System: 7831 SUBJECT: EXHAUST - Thrust Reverser - Blocker Door Aero/Fire Seal Replacement 

## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2005 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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writing by Boeing.BLANK PAGE April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 2 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

BLANK PAGETable of Contents April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 3 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

Table of Contents Revision Transmittal Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . 26 3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . 26 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . 26 2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . 28 3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . 29 3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 FIGURE 1: REMOVE AND REPLACE AERO/FIRE SEALS - NUMBER 1 ENGINE, LEFT AND RIGHT THRUST REVERSER HALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 FIGURE 2: REMOVE AND REPLACE AERO/FIRE SEALS - NUMBER 2 ENGINE, LEFT AND RIGHT THRUST REVERSER HALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 FIGURE 3: REMOVE AND REPLACE AERO/FIRE SEALS - LEFT AND RIGHT SPARE THRUST REVERSER HALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Table of Contents April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 4 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

BLANK PAGEApril 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 5 of 38 

### Commercial Airplane Group 

# 737

SPECIAL ATTENTION 

# Service Bulletin

Number: 737-78-1074 

### Revision Transmittal Sheet Date: April 07, 2005 Revision 1 September 15, 2005 ATA System: 7831 SUBJECT: EXHAUST - Thrust Reverser - Blocker Door Aero/Fire Seal Replacement

This Revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION No more work is necessary on airplanes changed as shown in the initial release of this service bulletin.

REASON FOR REVISION Revision 1 is sent to change the compliance data, the industry support data and to add more data about the sealant given in the initial release of this service bulletin. The compliance data given in the Summary and in paragraph 1.E., Compliance is changed from 24 months or 4000 flight cycles to 60 months or 8200 flight cycles (the first to occur). The warranty date given in the Summary and in paragraph 2. B., Industry Support Information is changed from May 22, 2003 to December 25, 2001. More data is added for the sealant used to install the new aero/fire seals as given in paragraph 2.C.2., Parts and Materials Supplied by the Operator. Paragraph 1.A., Effectivity, shows changes of airplane operators. Each operator should examine the Effectivity paragraph for changes. Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location of important changes. Pages with no vertical lines have no important changes.

REVISION HISTORY Original Issue: April 7, 2005 Revision 1: September 15, 2005April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 6 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

BLANK PAGEApril 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 38 

### Commercial Airplane Group 

# 737

SPECIAL ATTENTION 

# Service Bulletin

Number: 737-78-1074 

### Summary Date: April 07, 2005 Revision 1 September 15, 2005 ATA System: 7831 SUBJECT: EXHAUST - Thrust Reverser - Blocker Door Aero/Fire Seal Replacement

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

CONCURRENT REQUIREMENTS

None.

BACKGROUND Boeing has found that the top three inches of the blocker door aero/fire seal on the thrust reverser torque box does not have sufficient fire resistant properties. The aero/fire seals are made of material which could let a fire to go from the fan compartment (a fire zone) to the thrust reverser actuator compartment (a flammable leakage zone). The aero/fire seals on the thrust reverser torque box are not in compliance with Federal Aviation Regulation FAR 25.1191. This service bulletin gives instructions to replace the aero/fire seals on the torque box of the thrust reverser. Replacement of the aero/fire seals as given in this service bulletin is necessary for FAR 25.1191 compliance. Boeing Service Related Problem (SRP) 737-SRP-71-0036 is related to this service bulletin. ACTION (PRR 38275-62S) Open the thrust reverser on each engine and replace two aero/fire seals.

EFFECTIVITY 737-600, -700, -700C, -800, -900 Airplanes. Refer to service bulletin Paragraph 1.A.1. for effectivity.

COMPLIANCE Boeing recommends that operators do the changes given in this service bulletin in 60 months or 8200 flight cycles (the first to occur) from the release date of Revision 1 of this service bulletin.

INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of December 25, 2001. Please refer to Paragraph 2.B., Industry Support Information.April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 8 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

MANPOWER

MATERIAL INFORMATION Boeing Supplied Kits/Parts. Refer to Paragraph 2.A., Material - Price and Availability. Engines Total Task Hours Elapsed Hours Two Installed Engines 6.0 3.0 Each Spare Thrust Reverser Assembly 2.0 1.0

Note: The man-hours do not include the time necessary to cure the sealant.

FWD FWD

ON EACH THRUST REVERSER HALF. REPLACE EACH AERO/FIRE SEAL TORQUE BOX TORQUE BOXW72693April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9 of 38 

### Commercial Airplane Group 

# 737

SPECIAL ATTENTION 

# Service Bulletin

Number: 737-78-1074 Date: April 07, 2005 Revision 1 September 15, 2005 ATA System: 7831 SUBJECT: EXHAUST - Thrust Reverser - Blocker Door Aero/Fire Seal Replacement

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

1. PLANNING INFORMATION A. Effectivity 1. Airplanes Refer to Service Bulletin Index Document D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data. This service bulletin is for the airplanes shown below. An equivalent change is on subsequent production airplanes. Refer to PRR 38275-62S for data about this change.

Airplane models:

737-600 737-700 737-700C 737-800 737-900 IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER AERO CONTRACTORS LTD (YAT) 1 YG042 AEROMEXICO (AMX) 1 YB207 YB851–YB859 YB861–YB862 YB871–YB872 AIR ALGERIE (ALG) 1 YD101–YD107 YE301–YE305 AIR ASTANA (AKZ) 1 YA356–YA357 YC151 GROUP CONFIGURATION DESCRIPTION 1 - All airplanesApril 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 10 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

AIR BERLIN (BER) 1 YB201 YB203 YB911 YC051–YC070 YC461 YC701 YC703 YC705 YD151–YD157 YD218 YD261 AIR CHINA (BEJ) 1 YA681–YA682 YB584–YB586 YC944–YC951 YC981–YC983 AIR CHINA CHONGQING BRANCH (CHO) 1 YC941–YC943 AIR CHINA SOUTHWEST BRANCH (XIN) 1 YC426–YC428 YE201–YE206 AIR CHINA TIANJIN BRANCH (TJA) 1 YB581–YB583 AIR EUROPA (ARE) 1 YC761–YC770 YC907 YD206–YD209 YK002–YK003 YK361 AIR HORIZONS (AHZ) 1 YC727 AIR MAURITANIE (MAR) 1 YA302 YB651 AIR NATIONAL GUARD (USK) 1 YG044 YG067 YG069 AIR PACIFIC (APC) 1 YA291 YC931–YC932 AIR SAHARA (SAQ) 1 YA253–YA254 YA351 YA731 YB204–YB205 YC462 YC901–YC902 YG001 AIR SENEGAL INTERNATIONAL (SNG) 1 YA683–YA684 AIR SHAMROCK (SHI) 1 YG016 AIRTRAN (CQT) 1 YB371–YB375 YM201–YM202 ALASKA AIRLINES (ASA) 1 YA841–YA862 YD501–YD512 ALOHA AIRLINES (ALO) 1 YA608 YA610 YA614–YA615 YA627–YA629 YA631 YA732–YA733 YB656April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 11 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

AMERICAN AIRLINES (AAL) 1 YC801–YC877 AMIRI FLIGHT (ABD) 1 YD410 YG023 YG026 ARAMCO ASSOCIATED COMPANY (RAS) 1 YB151–YB153 YG601–YG602 ASTRAEUS, LTD. (AUA) 1 YA671–YA672 ATA AIRLINES, INC. (AAT) 1 YD301 YD304–YD305 YD308 YD310 YD313–YD333 AUSTRALIAN WEDGETAIL PROGRAM (ZVI) 1 YG089 YG201 AUSTRIAN (AUL) 1 YB171–YB172 YC381–YC384 YE171–YE172 BANCO SAFRA (BNS) 1 YG040 BB FIVE, INC (YIP) 1 YG066 BBJ ONE (BBI) 1 YG068 BEL AIR LIMITED (ULL) 1 YG022 BELAVIA (ITU) 1 YD408 BNJ SALES COMPANY (BNJ) 1 YG031 YG033 YG036 YG038 BOEING DEMONSTRATOR JET (BCJ) 1 YG071 BRAATHENS (BRT) 1 YA311 YA543 YA545 YA547–YA552 YB005–YB006 BRITANNIA AIRWAYS (BRI) 1 YD001–YD003 YD005–YD007 BWIA WEST INDIES AIRWAYS (TTA) 1 YC136–YC141 YJ001April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 12 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

CASINO EXPRESS AIRLINES (CIN) 1 YC437 CHARTWELL (CHP) 1 YG017 CHINA AIRLINES (CHI) 1 YC571 YC574–YC583 YC589 CHINA EASTERN AIRLINES (CEA) 1 YB206 YB561–YB570 CHINA EASTERN AIRLINES WUHAN (WUH) 1 YD171–YD172 CHINA EASTERN YUNNAN AIRLINES (YUN) 1 YA811–YA814 CHINA SOUTHERN AIRLINES (GUN) 1 YB881–YB885 YJ671–YJ682 CHINA UNITED AIRLINES (CUL) 1 YB631–YB632 CHINA XINJIANG AIRLINES (XIJ) 1 YA255–YA256 YA645 YA656 COLOMBIAN AIR FORCE (CLB) 1 YG028 COMMONWEALTH OF AUSTRALIA (GAU) 1 YG072 YG075 CONTINENTAL AIRLINES (CAL) 1 YA501–YA536 YC321–YC380 YD601–YD612 YJ501–YJ517 YJ531–YJ543 COPA AIRLINES (COP) 1 YA755–YA756 YA961–YA974 YJ591–YJ593 CYPRUS TURKISH AIRLINES (KTHY) (KHT) 1 YC467 YD021–YD022 DALLAH AL BARAKA (KAM) 1 YG063 DELTA AIR LINES (DAL) 1 YC601–YC655 YC681–YC696 DOBRO LIMITED (DOB) 1 YG008April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 13 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

DUBAI AIR WING (DAW) 1 YD402 YG007 E & A AVIATION (RSB) 1 YG082 EASYJET (EZY) 1 YB101–YB132 EIE EAGLE (EIE) 1 YD409 EL AL ISRAEL AIRLINES (ELA) 1 YA881–YA882 YC405 YC591–YC593 ETHIOPIAN AIRLINES (ETH) 1 YA666–YA667 YB156–YB157 EUROCYPRIA AIRLINES (ECY) 1 YC186–YC189 EVA AIR (EVA) 1 YG083 EXCEL AIRWAYS (SBE) 1 YC111–YC113 YC903 YC905–YC906 YK131 EXCEL AIRWAYS-CYPRUS (XLC) 1 YC436 FORD AIR SERVICES (FMC) 1 YA541–YA542 FUNAIR (FUN) 1 YG027 FUTURA (FUA) 1 YC407 YC451 YC463–YC464 YC466 YJ011 GAMA AVIATION LTD (GAV) 1 YG010 GE CAPITAL CORPORATION (GEF) 1 YA630 GE CORPORATE AIR TRANSPORT (GEB) 1 YG003 YG012 GERMANIA (GER) 1 YA231 YA233 YA235–YA240April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 14 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

GOL AIRLINES (GOT) 1 YA201–YA202 YA232 YA234 YA241–YA242 YA251–YA252 YA321 YA602 YA605 YA607 YA611–YA612 YA646–YA648 YA650 YA657 YB202 YB271 YD256–YD257 YD302–YD303 YD306–YD307 YJ471–YJ472 GOVT OF EQUATORIAL GUINEA (EGR) 1 YG085 HAINAN AIRLINES (HNA) 1 YA544 YA546 YA603–YA604 YA606 YC126–YC127 YC401 YC404 YC409 YC452 YC971–YC978 YD042–YD045 YD216 HAMBURG INTERNATIONAL (HAU) 1 YA574–YA578 YB276 HAPAG-LLOYD FLUG (HAP) 1 YC001–YC030 YD004 YD219 HELIOS AIRWAYS (HCY) 1 YC416–YC417 ICA BERMUDA (IBL) 1 YG062 INTER AIRLINES (IAW) 1 YJ473 YJ475 JET AIRWAYS (JPL) 1 YA609 YA621–YA622 YA734 YA751–YA754 YB181–YB184 YC402–YC403 YC731–YC741 YD309 YD311–YD312 YD571–YD572 JET AVIATION (JTA) 1 YD405 YG015 YG021 KENYA AIRWAYS (KEN) 1 YA635–YA636 YA641–YA642 KEVINAIR (KVN) 1 YG037 KLM - ROYAL DUTCH AIRLINES (KLM) 1 YC781–YC793 YD531–YD535 KOREAN AIR (KAL) 1 YC441–YC448 YD121–YD126 YD541–YD547 YD561–YD564 YD591–YD593 LAS VEGAS JET (LVJ) 1 YG002April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 15 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

LIMITED BRAND INC. (LII) 1 YG005 LINEAS AEREAS AZTECA (AZX) 1 YA601 YB501–YB502 LOWA CORPORATION (LWA) 1 YD406 LUXAIR (LUX) 1 YB901–YB902 MAERSK AIR (MRS) 1 YA203–YA211 YA221 YA571–YA573 MALEV HUNGARIAN AIRLINES (HGA) 1 YA371–YA375 YC201–YC203 YC206 YE321–YE326 MANDARIN AIRLINES (MDN) 1 YC587–YC588 MIAMI AIR (MIB) 1 YC146 YC904 YK121–YK122 MID EAST JET (SKL) 1 YD407 YG013–YG014 MONGOLIAN AIRLINES MIAT (MNG) 1 YJ476 MULTIFLIGHT (MFL) 1 YD404 N720CH, INC. (NCH) 1 YG019 NATIONAL (NJI) 1 YG032 NATIONAL AIR SERVICES (NAR) 1 YD403 YG080 YG086–YG087 NEOS (NEO) 1 YJ002 YJ021 YJ631–YJ632 NEWS AMERICA INCORPORATED (NWS) 1 YG020 OMAN AIR (OMR) 1 YA366–YA367 YB551 YC171 YJ901 OMNIFLYS (OML) 1 YG077April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 16 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

PACIFIC BLUE AIRLINES (BLP) 1 YK324 PEGASUS AIRLINES (PGS) 1 YC391–YC392 YC406 YC410 YC412 YC414–YC415 YC455 YC572–YC573 YD025 YD391 PICTON II (UNU) 1 YG006 POLYNESIAN AIRLINES (PLY) 1 YC147 PRIVATAIR (PTS) 1 YG018 YG064 QANTAS (QAN) 1 YC878–YC892 YJ911–YJ918 REPUBLIC OF CHINA AIR FORCE (CAF) 1 YC396 ROYAL AIR MAROC (RAM) 1 YA831–YA835 YC301–YC305 YK301–YK302 ROYAL JET (RJT) 1 YG024–YG025 ROYAL MALAYSIA AIR FORCE (MAF) 1 YG061 RYANAIR (RYR) 1 YC471–YC499 YJ801–YJ833 SAFAIR (SFA) 1 YD481–YD485 SAMSUNG TECHWIN CO. (SST) 1 YG079 SAS (SAS) 1 YB001–YB004 YD041 YD046–YD057 YD081–YD084 YE001–YE020 YE051 YE101–YE109 SAS INSTITUTE INC. (SJS) 1 YG041 SAUDI OGER (SAO) 1 YD401 YG073April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 17 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

SHANGHAI AIRLINES (SHA) 1 YA272 YA312–YA314 YA891–YA892 YC166–YC169 YC394 YJ003–YJ004 YJ871 SHARE JET (SJL) 1 YG035 SHENZHEN AIRLINES (SHZ) 1 YA613 YA626 YA686–YA687 YA721–YA722 YA801–YA803 YA809 YC153–YC154 YC411 YC413 YK101–YK104 SIGAIR (SIG) 1 YG034 SKY AIRLINES (SYC) 1 YC730 SOUTH AFRICAN AIRFORCE (SFF) 1 YG076 SOUTH AFRICAN AIRWAYS (SAA) 1 YC708–YC715 YC720–YC725 YD023–YD024 SOUTHERN AIRCRAFT SERVICES (HUZ) 1 YG009 SOUTHWEST AIRLINES (SWA) 1 YA001–YA099 YA101–YA187 YA271 YA301 SPICEJET (ROJ) 1 YC465 YC704 YC707 STERLING EUROPEAN AIRLINES (STR) 1 YC101–YC104 YC751–YC752 YJ933–YJ934 YK001 YK004 SUN COUNTRY AIRLINES (SCA) 1 YC121 YC152 YC155–YC156 YJ935 SUNEXPRESS (SNS) 1 YC453 YC702 YC706 YD201–YD202 YJ477–YJ480 SWIFLITE AIRCRAFT CORPORATION (OSF) 1 YG078 TAROM - ROMANIAN AIR TRANSPORT (TRM) 1 YB161–YB164 TBN AVIATION AVV (TBE) 1 YG029April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 18 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

TRACINDA CORP. (TRD) 1 YG004 TRANSAVIA AIRLINES (TAV) 1 YB521–YB525 YB541–YB544 YC071–YC083 YC091–YC094 TRAVEL SERVICE (TSF) 1 YC408 YC454 YC459 YD203 YJ474 YK005 TUI AIRLINES BELGIUM (TLB) 1 YD217 YJ931 TUNISAIR (TUN) 1 YE151–YE157 YG030 TURKISH AIRLINES (THY) 1 YC501–YC526 TUTOR-SALIBA CORPORATION (TTS) 1 YG070 UNITED STATES NAVY (USN) 1 YG501–YG507 US AIR FORCE (USF) 1 YG074 YG081 YG084 YG088 VARIG AIRLINES (VAR) 1 YA322–YA323 YC728–YC729 VENTURA AVIATION (VTU) 1 YG011 VIRGIN BLUE AIRLINES (VOZ) 1 YA336–YA345 YA649 YA658–YA659 YA685 YA688–YA691 YB208 YC393 YC421–YC422 YC921–YC922 YD251–YD254 YJ861–YJ867 YJ932 YK111–YK112 YK321–YK323 YK325–YK328 YM101 WESTJET (WJI) 1 YB301–YB310 YB601–YB625 XIAMEN AIRLINES (XIA) 1 YA701–YA710 YEMENIA (YEM) 1 YC176–YC178 YONA AVIATION II, LLC (VRH) 1 YG043April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 19 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

ZEPHYR LIMITED (PFR) 1 YG039

IDENTIFICATION BY VARIABLE NUMBER Variable Group YA001–YA099 1 YA101–YA187 1 YA201–YA211 1 YA221 1 YA231–YA242 1 YA251–YA256 1 YA271–YA272 1 YA291 1 YA301–YA302 1 YA311–YA314 1 YA321–YA323 1 YA336–YA345 1 YA351 1 YA356–YA357 1 YA366–YA367 1 YA371–YA375 1 YA501–YA536 1 YA541–YA552 1 YA571–YA578 1 YA601–YA615 1 YA621–YA622 1 YA626–YA631 1 YA635–YA636 1 YA641–YA642 1 YA645–YA650 1 YA656–YA659 1 YA666–YA667 1 YA671–YA672 1 YA681–YA691 1 YA701–YA710 1 YA721–YA722 1 YA731–YA734 1 YA751–YA756 1 YA801–YA803 1 YA809 1April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 20 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

YA811–YA814 1 YA831–YA835 1 YA841–YA862 1 YA881–YA882 1 YA891–YA892 1 YA961–YA974 1 YB001–YB006 1 YB101–YB132 1 YB151–YB153 1 YB156–YB157 1 YB161–YB164 1 YB171–YB172 1 YB181–YB184 1 YB201–YB208 1 YB271 1 YB276 1 YB301–YB310 1 YB371–YB375 1 YB501–YB502 1 YB521–YB525 1 YB541–YB544 1 YB551 1 YB561–YB570 1 YB581–YB586 1 YB601–YB625 1 YB631–YB632 1 YB651 1 YB656 1 YB851–YB859 1 YB861–YB862 1 YB871–YB872 1 YB881–YB885 1 YB901–YB902 1 YB911 1 YC001–YC030 1 YC051–YC083 1 YC091–YC094 1 YC101–YC104 1 YC111–YC113 1 Variable GroupApril 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 21 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

YC121 1 YC126–YC127 1 YC136–YC141 1 YC146–YC147 1 YC151–YC156 1 YC166–YC169 1 YC171 1 YC176–YC178 1 YC186–YC189 1 YC201–YC203 1 YC206 1 YC301–YC305 1 YC321–YC384 1 YC391–YC394 1 YC396 1 YC401–YC417 1 YC421–YC422 1 YC426–YC428 1 YC436–YC437 1 YC441–YC448 1 YC451–YC455 1 YC459 1 YC461–YC467 1 YC471–YC499 1 YC501–YC526 1 YC571–YC583 1 YC587–YC589 1 YC591–YC593 1 YC601–YC655 1 YC681–YC696 1 YC701–YC715 1 YC720–YC725 1 YC727–YC741 1 YC751–YC752 1 YC761–YC770 1 YC781–YC793 1 YC801–YC892 1 YC901–YC907 1 YC921–YC922 1 Variable GroupApril 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 22 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

YC931–YC932 1 YC941–YC951 1 YC971–YC978 1 YC981–YC983 1 YD001–YD007 1 YD021–YD025 1 YD041–YD057 1 YD081–YD084 1 YD101–YD107 1 YD121–YD126 1 YD151–YD157 1 YD171–YD172 1 YD201–YD203 1 YD206–YD209 1 YD216–YD219 1 YD251–YD254 1 YD256–YD257 1 YD261 1 YD301–YD333 1 YD391 1 YD401–YD410 1 YD481–YD485 1 YD501–YD512 1 YD531–YD535 1 YD541–YD547 1 YD561–YD564 1 YD571–YD572 1 YD591–YD593 1 YD601–YD612 1 YE001–YE020 1 YE051 1 YE101–YE109 1 YE151–YE157 1 YE171–YE172 1 YE201–YE206 1 YE301–YE305 1 YE321–YE326 1 YG001–YG044 1 YG061–YG064 1 Variable GroupApril 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 23 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

2. Spares Affected Examine your spares supply for the parts or components identified in Paragraph 2.C., Parts Necessary for Each Airplane. If any parts or components are found, refer to Paragraph 2.C. for the recommended use. YG066–YG089 1 YG201 1 YG501–YG507 1 YG601–YG602 1 YJ001–YJ004 1 YJ011 1 YJ021 1 YJ471–YJ480 1 YJ501–YJ517 1 YJ531–YJ543 1 YJ591–YJ593 1 YJ631–YJ632 1 YJ671–YJ682 1 YJ801–YJ833 1 YJ861–YJ867 1 YJ871 1 YJ901 1 YJ911–YJ918 1 YJ931–YJ935 1 YK001–YK005 1 YK101–YK104 1 YK111–YK112 1 YK121–YK122 1 YK131 1 YK301–YK302 1 YK321–YK328 1 YK361 1 YM101 1 YM201–YM202 1 Variable GroupApril 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 24 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

B. Concurrent Requirements

None.

C. Reason Boeing has found that the top three inches of the blocker door aero/fire seal on the thrust reverser torque box does not have sufficient fire resistant properties. The aero/fire seals are made of material which could let a fire to go from the fan compartment (a fire zone) to the thrust reverser actuator compartment (a flammable leakage zone). The aero/fire seals on the thrust reverser torque box are not in compliance with Federal Aviation Regulation FAR 25.1191. This service bulletin gives instructions to replace the aero/fire seals on the torque box of the thrust reverser. Replacement of the aero/fire seals as given in this service bulletin is necessary for FAR 25.1191 compliance. Revision 1 is sent to change the compliance data, the industry support data and to add more data about the sealant given in the initial release of this service bulletin. The compliance data given in the Summary and in paragraph 1.E., Compliance is changed from 24 months or 4000 flight cycles to 60 months or 8200 flight cycles (the first to occur). The warranty date given in the Summary and in paragraph 2. B., Industry Support Information is changed from May 22, 2003 to December 25, 2001. More data is added for the sealant used to install the new aero/fire seals as given in paragraph 2.C.2., Parts and Materials Supplied by the Operator. Boeing Service Related Problem (SRP) 737-SRP-71-0036 is related to this service bulletin. D. Description Open the thrust reverser on each engine and replace two aero/fire seals. Revision 1 - No more work is necessary on airplanes changed as shown in the initial release of this service bulletin. E. Compliance Boeing recommends that operators do the changes given in this service bulletin within 60 months or 8200 flight cycles (the first to occur) from the release date of Revision 1 of this service bulletin.April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 25 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

F. Approval This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this service bulletin comply with the applicable regulations and are FAA approved, as well as European Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/ JAA approved airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other 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. G. Manpower The table below shows an estimate of the task-hours necessary to do this change 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 find the tools.

H. Weight and Balance Changes

None.

I. Electrical Load Data Not applicable. Task Number of Persons Task-Hours Elapsed Hours Open Access 2 1.0 0.50 Figure 1 2 2.0 1.0 Figure 2 2 2.0 1.0 Close Access 2 1.0 0.50 TOTAL FOR TWO INSTALLED ENGINES 6.0 3.0 Note: The Man-hours do not include time necessary to cure the sealant.

Task Number of Persons Task-Hours Elapsed Hours Figure 3 2 2.0 1.0 TOTAL FOR EACH SPARE THRUST REVERSER ASSEMBLY 2.0 1.0

Note: The Man-hours do not include time necessary to cure the sealant.April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 26 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

J. References 1. Existing Data: a. Engineering Change Memo PRR 38275-62S b. Service Related Problem (SRP) 737-SRP-71-0036 c. 737-600/-700/-800/-900 Maintenance Manual (AMM) 78-31-00, 78-31-24 d. Boeing Standard Overhaul Practices Manual (BSOPM) 20-50-10, 20-50-12 e. Boeing Document D6-19567, Service Bulletin Index f. Boeing Drawing 65-88700 g. 737 Structural Repair Manual (SRM), Chapter 51 2. Data supplied with this Service Bulletin:

None. 3. Installation Drawings Used in the Preparation of this Service Bulletin:

None.

K. Publications Affected

L. Interchangeability and Intermixability of Parts Refer to Paragraph 2.C., Parts Necessary For Each Airplane, for interchangeability and intermixability information. Publication Chapter-Section 737-600/-700/-800/-900 Maintenance Manual 78-31April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 27 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

2. MATERIAL INFORMATION A. Material - Price and Availability Boeing can supply the kit/parts shown in Paragraph 2.C., Parts Necessary For Each Airplane and Paragraph 2.D., Parts Necessary to Change Spares as shown below. If there is a limit to the quantity (QTY) of available kits/parts, a supply sequence is given by Spares. More kits/parts become available as shown in the Reorder Lead Time (ROLT). ROLT is calculated from the date Boeing gets the purchase order.

The kit/parts are subject to the terms and conditions of the Boeing standard purchase order acknowledgment. After the Unit Price date, new price and ROLT data is applicable. Prices are in United States dollars. Terms: Net 30 days. Reference this service bulletin and submit your purchase order by one of the methods that follow: 1. Order on-line via ATA Spec 2000 or Boeing Part Page 2. Fax to (206) 662-7145 3. Spares Customer Support - MC 36-65 Boeing Spares Department P.O. Box 3707 Seattle, Washington 98124-2207 USA B. Industry Support Information Boeing warranty remedies are available for 737 airplanes in warranty as of December 25, 2001. For man-hour reimbursement for airplanes in warranty as of that date, send a warranty claim to Boeing Commercial Airplanes Group - Warranties. The 012A0042-1 Kit for airplanes in warranty as of that date will be supplied at no charge. Send a purchase order for the 012A0042-1 to Boeing Spares. Please refer to this service bulletin number and reference the airplane variable number in your purchase order. C. Parts Necessary For Each Airplane

1. Kits/Parts: To get the kits/parts shown below, refer to Paragraph 2.A., Material - Price and Availability.

Note: One top kit and the items shown in Paragraph 2.C.2., Parts and Materials Supplied by the Number Name ROLT (Weeks) Unit Price thru 12/31/05 012A0042-1 Top Kit (a) 21 $3837.00 315A2245-7 Seal Assembly - Aero/Fire Seal (b) 21 $931.00 315A2245-8 Seal Assembly - Aero/Fire Seal (b) 21 $931.00 (a) One Kit is necessary for each airplane. (b) One seal is necessary for each spare thrust reverser.April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 28 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

Operator, are necessary for each airplane.

2. Parts and Materials Supplied by the Operator:

3. Parts Modified and Reidentified: The parts shown below are changed as shown in this service bulletin. The quantity (QTY) is the number of parts changed on each airplane.

4. Parts Removed and Not Replaced:

None. D. Parts Necessary to Change Spares To get the kits shown below, refer to Paragraph 2.A., Material - Price and Availability.

E. Special Tooling - Price and Availability

None. 012A0042 TOP KIT - SEAL ASSEMBLY - AERO / FIRE SEAL

New Part Number QTY Name Existing Part Number Notes -1 012A0042-1 - Top Kit -- -- 315A2245-7 2 Seal Assembly - Aero/Fire Seal 315A2245-1 (a) 315A2245-8 2 Seal Assembly - Aero/Fire Seal 315A2245-2 (a) (a) Discard the existing part.

Part Number / Specification QTY Name Notes BMS 5-63, Type II, Class B1/2 or B4 3 (3 Ounce Kit) Sealant Kit (a) (a) See the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data.

Existing Part Number QTY Name New Part Number Notes 315A2245-1 2 Seal Assembly - Aero/Fire Seal 315A2245-7 (a) 315A2245-2 2 Seal Assembly - Aero/Fire Seal 315A2245-8 (a) (a) This is the part number after the change given in this service bulletin.

Part Number Name QTY 315A2245-7 Seal Assembly - Aero/Fire Seal (a) 1 315A2245-8 Seal Assembly - Aero/Fire Seal (a) 1 (a) Install with BMS 5-63. See Paragraph 2.C.2., Parts and Materials Supplied by the Operator.April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 29 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

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.April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 30 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

BLANK PAGEApril 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 31 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

3. ACCOMPLISHMENT INSTRUCTIONS

A. GENERAL INFORMATION

CAUTION: KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR OTHER ELECTRICAL DAMAGE.

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. 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. — Angular tolerance is plus or minus 2 degrees 4. The work instructions are divided into two Parts. Part 1 gives instructions to replace the aero/fire seals on the airplane. Part 2 gives instructions to replace the aero/fire seals on the spare thrust reverser.

B. WORK INSTRUCTIONS Part 1 - Replace Aero/Fire Seals on Airplanes 1. Open the left and right side thrust reversers on engine number 1 as given in 737-600/700/800/900 AMM 78-31-00. 2. Remove and replace the aero/fire seals on the thrust reverser torque box as shown in Figure 1.

Note: Use BMS 5-63 sealant to install the aero/fire seals on the thrust reverser halves. 3. Open the left and right side thrust reversers on engine number 2 as given in 737-600/700/800/900 AMM 78-31-00 4. Remove and replace the aero/fire seals on the thrust reverser torque box as shown in Figure 2. 5. After replacement of the aero/fire seals, identify the thrust reverser identification (ID) plate with the service bulletin number. Refer to Boeing Standard Overhaul Practices Manual 20-50-10. 6. Put the airplane back to a serviceable condition.April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 32 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

Part 2 - Replace Aero/Fire Seals on Spare Thrust Reversers Assemblies With Part Numbers Less Than 315A2295-195 1. Remove and replace the aero/fire seal on the left and right thrust reverser halves of the spare thrust reversers as shown in Figure 3.

Note: Thrust reverser assemblies with part numbers 315A2295-195 or higher received the same aero/fire seals (315A2245-7 and 315A2245-8) as this service bulletin installs.

Note: Use BMS 5-63 sealant to install the aero/fire seals on the thrust reverser halves. 2. After replacement of the aero/fire seals, identify the thrust reverser identification (ID) plate with the service bulletin number. Refer to Boeing Standard Overhaul Practices Manual 20-50-10.FIGURE 1: REMOVE AND REPLACE AERO/FIRE SEALS - NUMBER 1 ENGINE, LEFT AND RIGHT THRUST REVERSER HALVES April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 33 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

FIGURE 1: REMOVE AND REPLACE AERO/FIRE SEALS - NUMBER 1 ENGINE, LEFT AND RIGHT THRUST REVERSER HALVES

FWD 3 1 LEFT THRUST REVERSER A SEE RIGHT THRUST REVERSER B SEE

TORQUE BOX

LEFT THRUST REVERSER 

### AW72682

(SHEET 1 OF 2)FIGURE 1: REMOVE AND REPLACE AERO/FIRE SEALS - NUMBER 1 ENGINE, LEFT AND RIGHT THRUST REVERSER HALVES April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 34 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for each engine.

STEP TASK NAME PART NUMBER QTY NOTES 1 Remove/ Discard Aero/Fire Seal 315A2245-1 1 Left thrust reverser halves. Remove seal as given in 737-600/700/800/900 AMM 78-31-24. 2 Remove/ Discard Aero/Fire Seal 315A2245-2 1 Right thrust reverser halves. Remove seal as given in 737-600/700/800/900 AMM 78-31-24. 3 Install Aero/Fire Seal 315A2245-7 1 Left thrust reverser halves, use BMS 5-63 sealant. Install seal as given in 737-600/700/800/900 AMM 78-31-24. 4 Install Aero/Fire Seal 315A2245-8 1 Right thrust reverser halves, use BMS 5-63 sealant. Install seal as given in 737-600/700/800/900 AMM 78-31-24. FWD

RIGHT THRUST REVERSER 

### B 4 2 TORQUE BOXW72688

(SHEET 2 OF 2)FIGURE 2: REMOVE AND REPLACE AERO/FIRE SEALS - NUMBER 2 ENGINE, LEFT AND RIGHT THRUST REVERSER HALVES April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 35 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

FIGURE 2: REMOVE AND REPLACE AERO/FIRE SEALS - NUMBER 2 ENGINE, LEFT AND RIGHT THRUST REVERSER HALVES

FWD 1 3



### A LEFT THRUST REVERSER TORQUE BOX B SEE REVERSER RIGHT THRUST

A SEE REVERSER LEFT THRUSTW72689

(SHEET 1 OF 2)FIGURE 2: REMOVE AND REPLACE AERO/FIRE SEALS - NUMBER 2 ENGINE, LEFT AND RIGHT THRUST REVERSER HALVES April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 36 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for each engine.

STEP TASK NAME PART NUMBER QTY NOTES 1 Remove/ Discard Aero/Fire Seal 315A2245-1 1 Left thrust reverser halves. Remove seal as given in 737-600/700/800/900 AMM 78-31-24. 2 Remove/ Discard Aero/Fire Seal 315A2245-2 1 Right thrust reverser halves. Remove seal as given in 737-600/700/800/900 AMM 78-31-24. 3 Install Aero/Fire Seal 315A2245-7 1 Left thrust reverser halves, use BMS 5-63 sealant. Install seal as given in 737-600/700/800/900 AMM 78-31-24. 4 Install Aero/Fire Seal 315A2245-8 1 Right thrust reverser halves, use BMS 5-63 sealant Install seal as given in 737-600/700/800/900 AMM 78-31-24. FWD

RIGHT THRUST REVERSER 

### B 4 2 TORQUE BOXW72691

(SHEET 2 OF 2)FIGURE 3: REMOVE AND REPLACE AERO/FIRE SEALS - LEFT AND RIGHT SPARE THRUST REVERSER HALVES April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 37 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

FIGURE 3: REMOVE AND REPLACE AERO/FIRE SEALS - LEFT AND RIGHT SPARE THRUST REVERSER HALVES

FWD 3 1

SPARE LEFT THRUST REVERSER TORQUE BOX499097

(SHEET 1 OF 2)FIGURE 3: REMOVE AND REPLACE AERO/FIRE SEALS - LEFT AND RIGHT SPARE THRUST REVERSER HALVES April 07, 2005 Revision 1 September 15, 2005 737-78-1074 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 38 of 38 

### BOEING SERVICE BULLETIN 737-78-1074

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for left and right spare thrust reverser halves.

STEP TASK NAME PART NUMBER QTY NOTES 1 Remove/ Discard Aero/Fire Seal 315A2245-1 1 Spare left thrust reverser halves. Remove seal as given in 737-600/700/800/900 AMM 78-31-24. 2 Remove/ Discard Aero/Fire Seal 315A2245-2 1 Spare right thrust reverser halves. Remove seal as given in 737-600/700/800/900 AMM 78-31-24. 3 Install Aero/Fire Seal 315A2245-7 1 Spare left thrust reverser halves, use BMS 5-63 sealant. Install seal as given in 737-600/700/800/900 AMM 78-31-24. 4 Install Aero/Fire Seal 315A2245-8 1 Spare right thrust reverser halves, use BMS 5-63 sealant. Install seal as given in 737-600/700/800/900 AMM 78-31-24. FWD

SPARE RIGHT THRUST REVERSER 4 2 TORQUE BOX499096

(SHEET 2 OF 2)