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 APPLICABLE

S92315

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 RUC Name QTY New Part Number PNC RC

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

September 2, 1999 737-35A1053

Revision 1: June 1, 2000 18
BOEING SERVICE BULLETIN 737-35A1053

SEE FIGURE 2

SEE FIGURE 3

(TYPICAL)

SEE FIGURE 4

SEE FIGURE 2

S92317

FIGURE 1. OXYGEN BOX HOSE TYPICAL LOCATIONS

September 2, 1999 SHEET 1 OF 1 737-35A1053

Revision 1: June 1, 2000 19
BOEING SERVICE BULLETIN 737-35A1053

FWD

CAPTAIN'S CONSOLE FIRST OFFICER'S CONSOLE

FWD

1 4

2 3

1 4

2 3

S92329

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT

September 2, 1999 SHEET 1 OF 2 737-35A1053

Revision 1: June 1, 2000 20
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

September 2, 1999 SHEET 2 OF 2 737-35A1053

Revision 1: June 1, 2000 21
BOEING SERVICE BULLETIN 737-35A1053

FWD

A

1 4

FWD

2 3

SEE A

FLIGHT COMPARTMENT

S92332

FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT

September 2, 1999 SHEET 1 OF 2 737-35A1053

Revision 1: June 1, 2000 22
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

September 2, 1999 SHEET 2 OF 2 737-35A1053

Revision 1: June 1, 2000 23
BOEING SERVICE BULLETIN 737-35A1053

FWD

FWD

A

1 4

2 3

SEE A

FLIGHT COMPARTMENT

S92333

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

September 2, 1999 SHEET 2 OF 2 737-35A1053

Revision 1: June 1, 2000 25

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:

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 Airplane Group

P.O. Box 3707, Mail Stop 2H-37

Seattle, WA 98124-2207