### Commercial Airplane Group 

# 737 Service Bulletin

Number: 737-35A1053 

## Revision Transmittal Sheet Date: September 2, 1999 Revision 1: June 1, 2000 ATA System: 3510

SUBJECT:OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose 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 This revision is sent to advise affected operators of the following: The NOTE referenced in IN 03 is revised to clarify the replacement of the hoses. The correlation of the existing oxygen hoses and the new oxygen hoses in the Existing Parts Accountability section is revised. An equivalent vendor oxygen hose part number list is added to the Parts Necessary For Each Airplane section. The data given in Information Notice 737-35A1053 IN 01, 02, and 03 are included in this revision. 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 Release: September 2, 1999 Revision 1: June 1, 2000

737-35A1053 Revision Transmittal Page 1 of 1

### Commercial Airplane Group 

# 737 Service Bulletin

Number: 737-35A1053 

## Summary Date: September 2, 1999 Revision 1: June 1, 2000 ATA System: 3510

SUBJECT:OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose Replacement

CONCURRENT REQUIREMENTS
None BACKGROUND The changes provided in this service bulletin will help prevent damage to the low pressure oxygen flex hoses that may be subjected to electrical current. An electrical grounding condition can cause the hose to melt or burn from smoke and /or fire. One operator has reported damaged oxygen supply hoses on another Boeing model in August of 1997. The damage has occurred due to a short circuit in the 757 Audio Select Panel which sent an electrical current through the support structure to the flight crew mask stowage box. This caused the spring inside the low pressure oxygen hose to act as an electrical conductor and heat up. This caused the hose to burn through. Also, a similar occurrence on a 737 was reported due to improper maintenance. This service bulletin will replace low pressure oxygen hoses with non-conductive hoses located on the flight deck. The replacement of the oxygen hoses will help prevent electrical current from passing through the supporting spring which can cause the hose to melt or burn from smoke and/or fire. Boeing Service Related Problem (SRP) 737-SRP-35-0014 is related to this service bulletin. ACTION(PRR 38275-1) Remove the crew oxygen boxes. Replace the existing low pressure hoses with new non-conductive hoses. Install the crew oxygen boxes. Functional test the system. EFFECTIVITY All 737-300/-400/-500 airplanes. COMPLIANCE Boeing recommends compliance at the earliest opportunity when manpower, material and facilities are available. INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes given in this service bulletin.
MANPOWER Total Elapsed Time Man-Hours (Hours) 1.75 1.75

MATERIAL INFORMATION
None

737-35A1053 Summary Page 1 of 2

### BOEING SERVICE BULLETIN 737-35A1053



### (TYPICAL) REPLACE OXYGEN BOX HOSES AS APPLICABLES92315

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 Summary Page 2 of 2

### Commercial Airplane Group 

# 737 Service Bulletin

Number: 737-35A1053 Date: September 2, 1999 Revision 1: June 1, 2000 ATA System: 3510

SUBJECT:OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose Replacement

THIS SERVICE 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 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 38275-1 for data about this change. Airplane Models: 737-300 737-400 737-500 IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER AAR AIRCRAFT SALES AND LEASING (AFD) PQ287 AB AIRLINES (BRR) PP509 PP920-PP921 AER LINGUS (ARL) PT161-PT168 PW591-PW596 AERIS (AEV) PQ345-PQ346 AEROFLOT (ARO) PW441-PW450 AIR AFRIQUE (AFR) PQ447-PQ448

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 Page 1 of 25

### BOEING SERVICE BULLETIN 737-35A1053

AIR AUSTRAL (AUX) PR096 PS621 PT215 AIR BELGIUM (ABL) PW504 AIR BERLIN (BER) PJ811 PW517 PW524 PW526-PW530 AIR CHINA (BEJ) PP521-PP522 PQ361-PQ373 AIR CHINA INNER MONGOLIAN (IML) PS614-PS617 AIR EUROPA (ARE) PM381 PP835-PP836 PP840 PP848 PQ226 PQ297 PQ487 PR002 PR004 PS657 PW031 PW041 PW043 PW065-PW066 PW266 PW851 AIR FRANCE (AFA) PP902 PP910-PP912 PQ988 PQ990-PQ991 PS604 PS606 PT169 PT301-PT302 PT501-PT514 PU311-PU313 AIR HOLLAND CHARTER (HOL) PP504 PP838 PQ976 AIR LIBERTE (ALB) PP843-PP844 AIR MADAGASCAR (MAD) PQ299 AIR MALAWI (AML) PS602 AIR MALTA (MLT) PQ306 PQ791-PQ793 PS873-PS874 AIR NAURU (NAU) PW556 AIR NEW ZEALAND (ANZ) PR009 PR014 PR045 PR062-PR064 PR077-PR080 AIR NIPPON (ANK) PT871-PT886 AIR ONE (ADH) PM410-PM411 PQ228-PQ229 PQ347-PQ348 PV232-PV236 AIR PACIFIC (APC) PT058 AIR PORTUGAL (TAP) PP904 PP907 PP985-PP986 PQ302

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 2

### BOEING SERVICE BULLETIN 737-35A1053

AIR ROSE (RSE) PP927 AIR TANZANIA (TNZ) PP926 AIR VANUATU (VAN) PQ454 AIRASIA (ASW) PM398 PQ972 AIRCALIN (NCI) PP918 ALASKA AIRLINES (ASA) PJ301-PJ302 PJ601-PJ615 PW116 PW231-PW252 AMERICA WEST AIRLINES (AMW) PP022 PP029 PP181-PP187 PP189 PP194-PP199 PP383 PP472 PP474-PP475 PP825-PP826 PP831 PP833-PP834 PP846 PP891-PP899 PP901 PP903 PP931-PP934 PP936 PR067 PS666-PS669 ANSETT AUSTRALIA (ANS) PP908-PP909 PP914-PP915 PQ026-PQ041 PS618 PS624 ASIANA AIRLINES (AAR) PT851-PT853 PV201-PV202 PV204-PV206 PV208 PV226-PV229 PW005 PW008-PW009 PW018-PW020 PW025 PW289 BALKAN BULGARIAN AIRLINES (BUL) PT216-PT217 PT220 BLUE PANORAMA AIRLINES (BPA) PW518-PW519 BOULLIOUN AVIATION SERVICES (BOU) PR017 BRAATHENS (BRT) PT001-PT015 PT021-PT025 PT029 PT170 PV351 PW573-PW576 BRAATHENS MALMO AVIATION (TSW) PP845 BRITISH AIRWAYS (BAB) PQ994-PQ995 PQ997 PR003 PR011-PR013 PW094 PW101-PW102 PW106 PW111-PW112 PW115 PW301-PW327 BRITISH MIDLAND AIRWAYS (BMA) PP923-PP924 PQ292 PQ971 PQ974-PQ975 PQ996 PT050 PT181-PT183 PT186-PT188 PT295 PT701-PT703 PW004 PW046 PW265 PW831 CAMEROON AIRLINES (CAM) PP384 PS627 PS872

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 3

### BOEING SERVICE BULLETIN 737-35A1053

CHILEAN AIR FORCE (CHF) PT996 CHINA AIRLINES (CHI) PW274 CHINA EASTERN AIRLINES (CEA) PQ977 PQ979 PQ981 PR141-PR143 CHINA SOUTHERN AIRLINES (GUN) PM407-PM409 PM541-PM547 PM549 PQ479-PQ480 PS631 PS841-PS846 PT041 PT043-PT048 PT052 CHINA SOUTHWEST AIRLINES (XIN) PM413-PM414 PP631-PP634 PQ295-PQ296 PQ401-PQ406 PQ408-PQ410 PQ471 PQ493 PS811 CHINA UNITED AIRLINES (CUL) PS896-PS897 CHINA XINHUA AIRLINES (XIH) PQ264 PQ804-PQ805 PR001 PS856 PW852-PW854 CHINA XINJIANG AIRLINES (XIJ) PM548 CHINA YUNNAN AIRLINES (YUN) PM412 PP651-PP652 PQ263 PQ411-PQ412 PQ414-PQ418 PS622-PS623 PS628 COLOR AIR (ANW) PQ291 PQ294 PQ481 CONTINENTAL AIRLINES (CAL) PP671-PP699 PP701-PP726 PP730 PP732-PP733 PQ432-PQ438 PT801-PT834 PT901-PT930 PT971-PT973 CORSAIR (COR) PQ224 PW661-PW662 CRONUS AIRLINES (CRM) PP517 PP929 PS608 PW002 PW157 CSA (CSA) PT617-PT621 PT981-PT985 PW038-PW039 PW431-PW435 DEBONAIR AIRWAYS (DEB) PP935 DELTA AIR LINES (DAL) PP002 PP021 PP023 PP231-PP243 PP473 PP503 PP506 PQ086-PQ087 PQ231-PQ233 PQ236-PQ237 DEUTSCHE BA (DBA) PP511 PP515-PP516 PP518-PP519 PR015-PR016 PR021-PR030 PS961-PS963 EASYJET (EZY) PM382 PP847 PQ221 PQ223 PR161-PR172

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 4

### BOEING SERVICE BULLETIN 737-35A1053

EASYJET SWITZERLAND (TEB) PQ225 PQ431 EGYPTAIR (EGP) PT561-PT565 ESTONIAN AIR (ENA) PT716-PT717 EURALAIR (ERA) PT146-PT148 PT214 FALCON AIR (FLK) PS636-PS638 FISCHER AIR (FIH) PS630 PS871 PS973 FREEDOM AIR INTERNATIONAL (SPT) PS651 FRENCH POSTAL OFFICE (FPO) PP392 PP832 PP913 PP925 PP947 PP951-PP952 PQ222 PQ301 PQ421 PS607 PS641-PS644 FRONTIER AIRLINES (FRO) PP305 PP471 PP514 PQ451 PQ982 PR005 PR007 PR065 PS653 FUTURA (FUA) PW026-PW027 PW030 PW033-PW035 PW047-PW048 PW118 PW267 PW501-PW502 GARUDA INDONESIA (GIA) PQ282 PQ288-PQ289 PR061 PR068-PR072 PT681-PT685 PW461-PW467 GB AIRWAYS (GBA) PP520 PR091-PR092 PS861 PW091-PW092 PW117 PW119-PW120 GE CAPITAL CORPORATION (GEF) PS978 GERMANIA (GER) PP507 PQ230 PQ234-PQ235 GO FLY (GFL) PM385 PM387-PM388 PM391 PM394 PP916 PQ285 PS971 PS974-PS977 GUANGXI AIRLINES (GUX) PT042 PT049 PT061-PT062 HAINAN AIRLINES (HNA) PQ473-PQ475 PS611 PS613 PV203 PV356-PV357 PW086-PW088 PW093 HAPAG-LLOYD FLUG (HAP) PT101-PT105 PW511-PW514 PW520-PW522 PW525

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 5

### BOEING SERVICE BULLETIN 737-35A1053

ICELANDAIR (ICE) PP948 PW561-PW562 PW564 ILFC (ILF) PQ286 ISLAMIC REPUBLIC OF PAKISTAN (PKG) PS612 ISLANDSFLUG (ISF) PP352 ISTANBUL AIRLINES (IST) PP510 PQ305 PW022 PW024 PW028 PW036 PW156 PW272-PW273 PW855-PW856 JAPAN AIRLINES (JAL) PW411-PW418 JAPAN TRANSOCEAN AIR (SWL) PW401-PW408 PW515-PW516 JAT YUGOSLAV AIRLINES (JAT) PP771-PP779 JET AIRWAYS (JPL) PT054 PT308 PV207 PV209 PV271-PV272 PW015 PW032 PW113-PW114 PW215-PW216 PW421-PW424 KENYA AIRWAYS (KEN) PR031-PR034 KLM - ROYAL DUTCH AIRLINES (KLM) PP861-PP877 PW001 PW014 PW017 PW051-PW054 PW611-PW622 LAB (LAB) PQ951 LAUDA AIR (LAL) PP851-PP852 PW701-PW702 LITHUANIAN AIRLINES (LIJ) PQ304 PT185 LOT POLISH AIRLINES (LOT) PQ978 PQ980 PT651-PT656 PV281-PV287 LUFTHANSA GERMAN AIRLINES (DLH) PQ051-PQ085 PQ088-PQ092 PS701-PS706 PT331-PT360 PV237 LUXAIR (LUX) PT515-PT516 PT671-PT672 PW741-PW742 MAERSK AIR (MRS) PT123 PT126-PT138 MAERSK AIR LIMITED (MSK) PT121 PT124-PT125

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 6

### BOEING SERVICE BULLETIN 737-35A1053

MAGIC CARPET AVIATION (MCI) PP991 MALAYSIA AIRLINES (MAS) PJ551-PJ561 PQ771-PQ772 PT303-PT307 PT309 PW201-PW214 PW217-PW230 MALEV HUNGARIAN AIRLINES (HGA) PM401 PM404-PM405 PM555-PM556 PQ298 MEXICO'S PRESIDENTIAL AIRCRAFT (MXG) PP919 OLYMPIC AIRWAYS (OLY) PR042 PW044 PW062-PW063 PW068 PW072 PW296 PW711-PW717 PACE AIRLINES (PIE) PW007 PAKISTAN INT'L AIRLINES (PIA) PP281-PP286 PEGASUS AIRLINES (PGS) PM561 PW010 PW012 PW029 PW261-PW264 PW268 PW286 PERUVIAN AIR FORCE (PRF) PT517 PHILIPPINE AIRLINES (PAL) PM384 PM390 PM393 PM395 PQ803 POLY TECHNOLOGIES (PTI) PP728-PP729 PS609-PS610 POLYNESIAN AIRLINES (PLY) PQ293 PREMIER AIRCRAFT MANAGEMENT (VEG) PS626 PRINCESS AIR LINES (PRL) PQ283 PRIVATAIR (PTS) PS862 PRO AIR (PRR) PR066 PV301-PV302 PW276 QANTAS (QAN) PQ001-PQ016 PW293 PW531-PW550 PW557 REPUBLIC OF KOREA AIR FORCE (KAF) PP221

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 7

### BOEING SERVICE BULLETIN 737-35A1053

RIO-SUL (ROS) PT051 PT053 PT055 PT059-PT060 PT063-PT064 PT212-PT213 PT218 PT721-PT725 PT854 PU301 ROYAL AIR MAROC (RAM) PT581-PT586 PW631-PW637 ROYAL THAI AIR FORCE (TAF) PV296 SABENA (SAB) PP961-PP967 PS654 PT611-PT616 PW503 PW681-PW683 PW761 SAHARA AIRLINES (SAQ) PW064 PW067 SATA-AIR ACORES (SAP) PM396 PP391 PQ992 SHANDONG AIRLINES (SHG) PQ391-PQ395 SHANGHAI AIRLINES (SHA) PQ281 SHANTOU AIRLINES (SHT) PM406 PM415-PM417 SHENZHEN AIRLINES (SHZ) PQ486 PS629 PS691-PS692 PS851-PS852 SILKAIR (SLK) PM392 PS652 SOBELAIR (SBL) PR101 SOUTHWEST AIRLINES (SWA) PP101-PP169 PP188 PP190-PP193 PP201-PP205 PP301-PP304 PP351 PP353 PP376-PP382 PP402-PP403 PP501-PP502 PP727 PP731 PP821-PP824 PP827 PS751-PS799 PS901-PS941 PU001-PU025 SPORTS JET (TSO) PW563 STERLING EUROPEAN AIRLINES (STR) PM383 PQ307 PT184 SUNEXPRESS (SNS) PM389 PM399 PM402 PM551 TACA INTERNATIONAL AIRLINES (TAC) PQ331-PQ332 TAESA (TES) PP922 PQ227 PQ284 PQ303 PS619 PW061

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 8

### BOEING SERVICE BULLETIN 737-35A1053

TAG AVIATION (TAG) PT219 TAROM - ROMANIAN AIR TRANSPORT (TRM) PQ931-PQ935 PR010 PS956 THAI (TII) PW161-PW171 THE CIT GROUP (TCI) PP508 PS601 TITAN AIRWAYS (TIU) PS620 TRANSAVIA AIRLINES (TAV) PM397 PP505 PP801-PP808 PS866-PS868 TRANSBRASIL (TBL) PP837 PP981-PP982 PQ241-PQ243 PQ983 PS603 PS605 PW016 PW021 PW023 PW037 TRAVEL SERVIS (TSF) PW006 PW042 TUNISAIR (TUN) PT641-PT644 TURKISH AIRLINES (THY) (THY) PM552-PM554 PM557 PM559-PM560 PM562-PM564 PT056-PT057 PW040 PW045 PW049-PW050 PW278 PW281-PW285 PW287-PW288 PW290-PW291 PW771 TURKMENISTAN AIRLINES (TUE) PQ265 PQ801-PQ802 UGANDA AIRLINES (UGA) PT211 UKRAINE INTERNATIONAL AIRLINES (UKR) PR181 UNITED AIRLINES (UAL) PQ101-PQ199 PQ201-PQ202 PT381-PT399 PT401-PT438 US AIRWAYS (USA) PP001 PP003-PP010 PP012-PP020 PP024-PP028 PP030-PP032 PP034-PP054 PP401 PP404-PP440 PV001-PV010 PV012-PV055 VARIG AIRLINES (VAR) PP905-PP906 PP917 PP987-PP990 PQ251-PQ262 PQ266-PQ267 PQ290 PQ985-PQ987 PR006 PR008 PR043-PR044 PR132 VASP AIRLINES (VSP) PP393 PP512-PP513 PP946 PP984 PR041 PS863

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 9

### BOEING SERVICE BULLETIN 737-35A1053

VIRGIN EXPRESS AIRLINES (EBA) PJ816-PJ817 PP839 PP841-PP842 PP928 PP930 PQ984 PQ989 PQ993 PS625 PS655-PS656 PS957 PS972 PV231 PW011 PW013 PW271 PW275 PW571-PW572 VIVA - SPAIN (VIV) PP983 PQ341-PQ344 WUHAN AIRLINES (WUH) PQ472 PQ491-PQ492 PR081-PR082 PR131 XIAMEN AIRLINES (XIA) PT026-PT028 PT030-PT031 ZHONGYUAN AIRLINES (ZHO) PQ407 PR121-PR122 PS836-PS837

IDENTIFICATION BY VARIABLE NUMBER
PJ301-PJ302 PJ551-PJ561 PJ601-PJ615 PJ811 PJ816-PJ817 PM381-PM399 PM401-PM417 PM541-PM564 PP001-PP054 PP101-PP169 PP181-PP199 PP201-PP205 PP221 PP231-PP243 PP281-PP286 PP301-PP305 PP351-PP353 PP376-PP384 PP391-PP393 PP401-PP440 PP471-PP475 PP501-PP522 PP631-PP634 PP651-PP652 PP671-PP699 PP701-PP733 PP771-PP779 PP801-PP808 PP821-PP827 PP831-PP848 PP851-PP852 PP861-PP877 PP891-PP899 PP901-PP936 PP946-PP948 PP951-PP952 PP961-PP967 PP981-PP991 PP993 PQ001-PQ016 PQ026-PQ041 PQ051-PQ092 PQ101-PQ199 PQ201-PQ202 PQ221-PQ237 PQ241-PQ243 PQ251-PQ267 PQ281-PQ299 PQ301-PQ307 PQ331-PQ332 PQ341-PQ348 PQ361-PQ373 PQ391-PQ395 PQ401-PQ418 PQ421 PQ431-PQ438 PQ447-PQ448 PQ451 PQ454 PQ471-PQ475 PQ479-PQ481 PQ486-PQ487 PQ491-PQ493 PQ771-PQ772 PQ791-PQ793 PQ801-PQ805 PQ931-PQ935 PQ951 PQ971-PQ997 PR001-PR017 PR021-PR034 PR041-PR045 PR061-PR072 PR077-PR082 PR091-PR092 PR096 PR101 PR121-PR122 PR131-PR132 PR141-PR143 PR161-PR172 PR181 PS601-PS631 PS636-PS638 PS641-PS644 PS651-PS657 PS666-PS669 PS691-PS692 PS701-PS706 PS751-PS799 PS811 PS836-PS837 PS841-PS846 PS851-PS852 PS856 PS861-PS863 PS866-PS868 PS871-PS874 PS896-PS897 PS901-PS941 PS956-PS957 PS961-PS963 PS971-PS978 PT001-PT015 PT021-PT031 PT041-PT064 PT101-PT105 PT121-PT138 PT146-PT148 PT161-PT170 PT181-PT188 PT211-PT220 PT295 PT301-PT309 PT331-PT360 PT381-PT399 PT401-PT438 PT501-PT517 PT561-PT565 PT581-PT586 PT611-PT621 PT641-PT644 PT651-PT656 PT671-PT672 PT681-PT685 PT701-PT703 PT716-PT717 PT721-PT725 PT801-PT834 PT851-PT854 PT871-PT886 PT901-PT930 PT971-PT973 PT981-PT985 PT996 PU001-PU025 PU301 PU311-PU313 PV001-PV055 PV201-PV209 PV226-PV229 PV231-PV237 PV271-PV272 PV281-PV287 PV296 PV301-PV302 PV351 PV356-PV357 PW001-PW054 PW061-PW068 PW072 PW086-PW088 PW091-PW094 PW101-PW102 PW106 PW111-PW120 PW156-PW157 PW161-PW171 PW201-PW252 PW261-PW268 PW271-PW276 PW278 PW281-PW293 PW296 PW301-PW327 PW401-PW408 PW411-PW418 PW421-PW424 PW431-PW435 PW441-PW450 PW461-PW467 PW501-PW504 PW511-PW522 PW524-PW550 PW556-PW557 PW561-PW564 PW571-PW576 PW591-PW596 PW611-PW622 PW631-PW637 PW661-PW662 PW681-PW683 PW701-PW702 PW711-PW717 PW741-PW742 PW761 PW771 PW831 PW851-PW856 2. Spares Affected
None

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 10

### BOEING SERVICE BULLETIN 737-35A1053

B. Concurrent Requirements
None C. Reason The changes provided in this service bulletin will help prevent damage to the low pressure oxygen flex hoses that may be subjected to electrical current. An electrical grounding condition can cause the hose to melt or burn from smoke and/or fire. One operator has reported damaged oxygen supply hoses on another Boeing model in August of 1997. The damage has occurred due to a short circuit in the 757 Audio Select Panel which sent an electrical current through the support structure to the flight crew mask stowage box. This caused the spring inside the low pressure oxygen hose to act as an electrical conductor and heat up. This caused the hose to burn through. Also, a similar occurrence on a 737 was reported due to improper maintenance. This service bulletin will replace low pressure oxygen hoses with non-conductive hoses located on the flight deck. The replacement of the oxygen hoses will help prevent electrical current from passing through the supporting spring which can cause the hose to melt or burn from smoke and/or fire. Revision 1 is sent to advise affected operators of the following: The NOTE referenced in IN 03 is revised to clarify the replacement of the hoses. The correlation of the existing oxygen hoses and the new oxygen hoses in the Existing Parts Accountability section is revised. An equivalent vendor oxygen hose part number list is added to the Parts Necessary For Each Airplane section. Boeing Service Related Problem (SRP) 737-SRP-35-0014 is related to this service bulletin D. Description Remove the crew oxygen boxes. Replace the existing low pressure hoses with new non-conductive hoses. Install the crew oxygen boxes. Functional test the system. An evaluation form is attached to this service bulletin. Please use this form to tell us what you think of the quality of this service bulletin. Revision 1 - No more work is necessary on airplanes changed as shown in the initial release of this service bulletin. E. Compliance Boeing recommends compliance at the earliest opportunity when manpower, material and facilities are available. 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.

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 11

### BOEING SERVICE BULLETIN 737-35A1053

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.

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 12

### BOEING SERVICE BULLETIN 737-35A1053

G. Manpower The table below shows an estimate of the man-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 man-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.

Task Number of Persons Man-Hours Elapsed Time (Hours) Access 1 .50 .50 Replace Hoses 1 .75 .75 Restore 1 .50 .50 TOTAL FOR EACH AIRPLANE 1.75 1.75
H. Weight and Balance Changes
None I. Electrical Load Data Not changed

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 13

### BOEING SERVICE BULLETIN 737-35A1053

J. References 1. Existing Data: a. Engineering Change Memo PRR38275-1 b. Service Related Problem (SRP) 737-SRP-35-0014 c. 737 Maintenance Manual (AMM) Subject 35-00-00, 35-10-00, 35-12-00, 35-12-85, 35-12-86 2. Data supplied with this service bulletin:
None 3. Installation Drawings Used in the Preparation of This Service Bulletin: Drawing Number Title 65C16991 Module Instl - First Observers Station 65C25647 Oxygen System Instl - Crew, 737
These drawings were used to prepare this service bulletin. These drawings are not necessary to make the specified changes, and are not supplied with this service bulletin. These drawings may not be applicable to all airplane configurations or operators. K. Publications Changed
Publication Chapter-Section
737 Maintenance Manual 35-12 737 Illustrated Parts Catalog 35-12
L. Interchangeability and Intermixability of Parts Refer to Paragraph 2.E., Existing Parts Accountability, for interchangeability and intermixability information.

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 14

### BOEING SERVICE BULLETIN 737-35A1053

2. MATERIAL INFORMATION A. Material - Price and Availability The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary For Each Airplane. As an alternative, operators can purchase the parts from Boeing Spares. This service bulletin does not show the Boeing price and supply data. B. Industry Support Information Boeing warranty remedies are not available for the configuration changes given in this service bulletin. C. Parts Necessary For Each Airplane
1. Kits:
None 2. Parts and Materials Supplied by the Operator:
QTY Boeing Part Number / Vendor Part Number Name

(a) 60B50059-614 / 38001-614 (b) Hose Assy (a) 60B50059-616 / 38001-616 (b) Hose Assy (a) 60B50059-617 / 38001-617 (b) Hose Assy (a) 60B50059-618 / 38001-618 (b) Hose Assy (a) For Hose quantity requirements, see Illustrated Parts Catalog 35-12 for customer specific configuration. (b) HydraFlow (V24984) 13259 East 166th Street Cerritos, CA 90701-2203 (USA)
D. Parts Necessary to Change Spares
None

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 15

### BOEING SERVICE BULLETIN 737-35A1053

E. Existing Parts Accountability The parts shown below are changed as shown in this service bulletin.

Existing Part Number RUCName QTY New Part Number PNCRC 10-60174-31 DIS Hose Assy (a) 60B50059-614 S A 10-60174-35 DIS Hose Assy (a) 60B50059-618 S A 10-60174-46 DIS Hose Assy (a) 60B50059-616 S A 60B50059-99 DIS Hose Assy (a) 60B50059-617 S A (a) For Hose quantity requirements, see Illustrated Parts Catalog 35-12 for customer specific configuration.

RUC Recommended Use Code DIS - Discard the part. PNC Part Number Code S- To get a new part, use this part number in your order. - This is the part number after the change given in this service bulletin. - This part is used in production. RC Replacement Code A - Do not use the existing part to replace the new or changed part. F. Special Tooling - Price and Availability
None G. 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.

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 16

### BOEING SERVICE BULLETIN 737-35A1053

3. ACCOMPLISHMENT INSTRUCTIONS GENERAL NOTES 1. The paragraphs identified with a letter give the general work instructions and the necessary tests. The instructions identified with numbers on the figures give the recommended sequence of steps. 2. Obey all of the warnings and cautions given in the specified manual sections. WORK INSTRUCTIONS NOTE: The instructions for this service bulletin are only for the replacement of the oxygen hoses located at the observers positions, and attached to the full face oxygen masks and stowage boxes, and not the cup type oxygen masks. The cup type oxygen masks located at the observers positions are not affected by this service bulletin and are not required to be modified. However, the captain and first officer positions are required to be modified regardless of the type of oxygen mask. CAUTION: OXYGEN SYSTEM COMPONENTS REQUIRE SPECIAL CARE AND HANDLING PROCEDURES. REVIEW THE SAFETY AND MAINTENANCE PROCESSES SHOWN IN THE 737 AMM 35-00. A. Remove the oxygen stowage box as shown in 737 AMM 35-12-86 or operator's equivalent procedure. B. Remove the existing conductive oxygen hoses as shown in Figures 1, 2, 3, and 4. NOTE: Ensure that the hose assembly elbows and unions do not move during hose replacement. Orientation of the elbows and unions are essential in maintaining proper clearances with other structure.
C. Install the applicable new non-conductive oxygen hoses as shown in Figures 1, 2, 3, and 4. D. Install the oxygen stowage boxes as shown in 737 AMM 35-12-86 or operator's equivalent procedure. E. Functional test the crew oxygen system as shown in the 737 AMM 35-12-00 or operator's equivalent procedure. F. Put the airplane back to a serviceable condition.

September 2, 1999 737-35A1053 Revision 1: June 1, 2000 17

### BOEING SERVICE BULLETIN 737-35A1053

FIGURE TABLE OF CONTENTS Title Page FIGURE 1. OXYGEN BOX HOSE TYPICAL LOCATIONS.. . . . . . . . . . . . . . . . . . . . . . . 19 FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT. . . . . . . . . . . 22 FIGURE 4. SECOND OBSERVER'S OXYGEN BOX HOSE REPLACEMENT . . .. . . . . 24

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### BOEING SERVICE BULLETIN 737-35A1053

SEE FIGURE 2 SEE FIGURE 3

(TYPICAL) SEE FIGURE 4

SEE FIGURE 2S92317

FIGURE 1. OXYGEN BOX HOSE TYPICAL LOCATIONS
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### BOEING SERVICE BULLETIN 737-35A1053

FWD

FIRST OFFICER'S CONSOLE CAPTAIN'S CONSOLE FWD 4 1 3 2

4 1 23S92329

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT
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### BOEING SERVICE BULLETIN 737-35A1053

The step numbers shown below agree with the numbers shown in the circle symbols in the figure.

STEP TASK NAME REFERENCES QTY NOTES 1 Remove / Keep Oxygen Box 737 AMM 35-12-86 2

-
2 Remove / Discard Hose Assy 737 AMM 35-12-86 2 Discard the Hose Assy after recording the part number. 3 Install Hose Assy 737 AMM 35-12-86 2 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 737 AMM 35-12-86 2

-

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT
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### BOEING SERVICE BULLETIN 737-35A1053

FWD



## A 4 1 FWD

3 2 A SEE



## FLIGHT COMPARTMENTS92332

FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT
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### BOEING SERVICE BULLETIN 737-35A1053

The step numbers shown below agree with the numbers shown in the circle symbols in the figure.

STEP TASK NAME REFERENCES QTY NOTES 1 Remove / Keep Oxygen Box 737 AMM 35-12-86 1

-
2 Remove / Discard Hose Assy 737 AMM 35-12-86 1 Discard the Hose Assy after recording the part number. 3 Install Hose Assy 737 AMM 35-12-86 1 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 737 AMM 35-12-86 1

-

FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT
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### BOEING SERVICE BULLETIN 737-35A1053

FWD FWD



## A 14 3 2 SEE A



## FLIGHT COMPARTMENTS92333

FIGURE 4. SECOND OBSERVER'S OXYGEN BOX HOSE REPLACEMENT
September 2, 1999 SHEET 1 OF 2 737-35A1053 Revision 1: June 1, 2000 24

### BOEING SERVICE BULLETIN 737-35A1053

The step numbers shown below agree with the numbers shown in the circle symbols in the figure.

STEP TASK NAME REFERENCES QTY NOTES 1 Remove / Keep Oxygen Box 737 AMM 35-12-86 1

-
2 Remove / Discard Hose Assy 737 AMM 35-12-86 1 Discard the Hose Assy after recording the part number. 3 Install Hose Assy 737 AMM 35-12-86 1 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 737 AMM 35-12-86 1

-

FIGURE 4. SECOND OBSERVER'S OXYGEN BOX HOSE REPLACEMENT
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### Commercial Airplane Group 

# 737 Service Bulletin

Number: 737-35A1053 

## Evaluation Form Date: September 2, 1999 Revision 1: June 1, 2000 ATA System: 3510 Prepared By: Chris Starr

SUBJECT:OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose Replacement

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)4321 (poor) Please rate the quality of the illustrations: (good)4321 (poor) Will you do the change given by this service bulletin? Yes No If not, please explain:
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Are the Planning Information, Material Information, and Accomplishment Instructions accurate? Yes No If not, please explain:
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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 Airplane Group P.O. Box 3707, Mail Stop 2H-37 Seattle, WA 98124-2207