### Commercial Airplane Group 

# 737 Service Bulletin

Number: 737-35A1058 

## 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 Parts Necessary For Each Airplane section has been revised to add the equivalent vendor oxygen hose part numbers. The Joint Airworthines Requirements (JAR) statement has been added to the Approval area of the service bulletin. The data given in Information Notice 737-35A1058 IN 01 and 02 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

737-35A1058 Revision Transmittal Page 1 of 1

### Commercial Airplane Group 

# 737 Service Bulletin

Number: 737-35A1058 

## 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. This damage has occurred due to a short circuit in the 757 Audio Select Panel. It sent an electrical current through the support structure to the flight crew oxygen 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 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 737-600/-700/-800 airplanes line numbers 1 through 348. 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

737-35A1058 Summary Page 1 of 2

### BOEING SERVICE BULLETIN 737-35A1058



### (TYPICAL) REPLACE OXYGEN BOX HOSES AS APPLICABLES92714

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 Summary Page 2 of 2

### Commercial Airplane Group 

# 737 Service Bulletin

Number: 737-35A1058 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: 737-600 737-700 737-800 IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER A. S. BUGSHAN AND BROTHERS (BUG) YG021 AIR BERLIN (BER) YC051-YC058 AIR CHINA (BEJ) YC941 AIR EUROPA (ARE) YC761-YC763 AIR PACIFIC (APC) YA291 YC931-YC932 ALASKA AIRLINES (ASA) YA841

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 Page 1 of 21

### BOEING SERVICE BULLETIN 737-35A1058

AMERICAN AIRLINES (AAL) YC801-YC816 AMIRI FLIGHT (ABD) YG023 ATLAS AIR (TLS) YG010 AXON AIRLINES (AXO) YA253-YA254 AZZURRAAIR (AZR) YA573 YA575 BEL AIR LIMITED (ULL) YG022 BOEING (TBC) YG002 BOEING DEMONSTRATOR JET (BCJ) YG001 BRAATHENS (BRT) YA311 YA541-YA546 BWIA INTERNATIONAL AIRWAYS (TTA) YA301 CHARTWELL PARTNERS (CHP) YG017 CHINA AIRLINES (CHI) YC571-YC580 CHINA YUNNAN AIRLINES (YUN) YA811-YA814 CONTINENTAL AIRLINES (CAL) YA501-YA531 YC321-YC346 COPA AIRLINES (COP) YA755-YA756 DELTA AIR LINES (DAL) YC601-YC608 DOBRO LIMITED (DOB) YG008 DUBAI AIR WING (DAW) YG007 EASTWIND AIRLINES (ESW) YA271-YA272

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### BOEING SERVICE BULLETIN 737-35A1058

EL AL ISRAEL AIRLINES (ELA) YA881 YC591-YC593 EURALAIR (ERA) YC701 YC703-YC704 FUNAIR (FUN) YG027 GE AIRCRAFT SERVICES (GEB) YG003 YG012 GERMANIA (GER) YA231-YA242 YA571-YA572 GOODWATER LIMITED (BCS) YG018 HAINAN AIRLINES (HNA) YC126-YC127 YC401 YC404 YC971 HAMBURG INTERNATIONAL AIRLINES (HAU) YA577 HAPAG-LLOYD FLUG (HAP) YC001-YC011 ISRAIR (ISA) YA574 YA576 ISTANBUL AIRLINES (IST) YC406 JET AIRWAYS (JPL) YA751-YA754 YC402-YC403 YC731-YC734 KLM - ROYAL DUTCH AIRLINES (KLM) YC781-YC783 LAPA ARGENTINA (LAZ) YA302 YA321 YA601 YA607 LAUDA AIR (LAL) YC381-YC382 MAERSK AIR (MRS) YA201-YA206 MID EAST JET (SKL) YG013-YG014 NEWS CORPORATION (NWS) YG020 NORTH AMERICAN AIRLINES (NNA) YC121 YC405

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 3

### BOEING SERVICE BULLETIN 737-35A1058

NORTH PACIFIC AVIATION (NPA) YG011 NORTHEAST (DELAWARE) (NDE) YG005 NOVAIR (NOO) YC702 YC705-YC706 PEGASUS AIRLINES (PGS) YC391 PICTON II (UNU) YG006 PRINCE TALAL BIN ABDUL AZIZ (PTA) YG015 ROYAL AIR MAROC (RAM) YA831-YA832 YC301-YC302 YC407-YC408 RYANAIR (RYR) YC471-YC474 SABRE AIRWAYS (SBE) YC111-YC112 SAHARA AIRLINES (SAQ) YA731 SAS (SAS) YE001-YE015 YE101-YE109 SHAMROCK HOLDINGS (SHI) YG016 SHANGHAI AIRLINES (SHA) YA312-YA314 SHENZHEN AIRLINES (SHZ) YA721-YA722 SOUTHERN AIRCRAFT SERVICES (HUZ) YG009 SOUTHWEST AIRLINES (SWA) YA001-YA043 STERLING EUROPEAN AIRLINES (STR) YC101-YC103 YC751-YC752 SUPERIOR INT'L AVIATION SRVCS. (JFY) YG028 TRACINDA CORP. (TRD) YG004

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 4

### BOEING SERVICE BULLETIN 737-35A1058

TRANSAERO AIRLINES (TRX) YA251-YA252 TRANSAVIA AIRLINES (TAV) YC071-YC076 TUNISAIR (TUN) YE151-YE153 TURKI BIN NASSER BIN ABDULAZIZ (TKN) YG029 TURKISH AIRLINES (THY) (THY) YC501-YC513 VARIG AIRLINES (VAR) YA602-YA606 XIAMEN AIRLINES (XIA) YA701-YA704 117 (117) YG030

IDENTIFICATION BY VARIABLE NUMBER YA001-YA043 YA201-YA206 YA231-YA242 YA251-YA254 YA271-YA272 YA291 YA301-YA302 YA311-YA314 YA321 YA501-YA531 YA541-YA546 YA571-YA577 YA601-YA607 YA701-YA704 YA721-YA722 YA731 YA751-YA756 YA811-YA814 YA831-YA832 YA841 YA881 YC001-YC011 YC051-YC058 YC071-YC076 YC101-YC103 YC111-YC112 YC121 YC126-YC127 YC301-YC302 YC321-YC346 YC381-YC382 YC391 YC401-YC408 YC471-YC474 YC501-YC513 YC571-YC580 YC591-YC593 YC601-YC608 YC701-YC706 YC731-YC734 YC751-YC752 YC761-YC763 YC781-YC783 YC801-YC816 YC931-YC932 YC941 YC971 YE001-YE015 YE101-YE109 YE151-YE153 YG001-YG018 YG020-YG023 YG027-YG030 2. Spares Affected None

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 5

### BOEING SERVICE BULLETIN 737-35A1058

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. This damage has occurred due to a short circuit in the 757 Audio Select Panel. It sent an electrical current through the support structure to the flight crew oxygen 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 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 Parts Necessary For Each Airplane section has been revised to add the equivalent vendor oxygen hose part numbers. The Joint Airworthiness Requirements (JAR) statement has been added to the Approval area of the service bulletin. A NOTE has been added to the beginning of the Accomplishment Instructions section to clarify which oxygen hoses are to be replaced. 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. Revision 1 - No more work is necessary on airplanes changed as shown in the initial release of this service bulletin. 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. E. Compliance Boeing recommends compliance at the earliest opportunity when manpower, material and facilities are available.

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 6

### BOEING SERVICE BULLETIN 737-35A1058

F. Approval NOTE: Joint Airworthiness Requirements (JAR) compliance status may be found in the Service Bulletin Index, Section 1. This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this service bulletin comply with the applicable Federal Aviation Regulations (FAR) and are FAA approved. This service bulletin and the FAA approval were based on the airplane in its original Boeing delivery configuration or as modified by other FAA approved Boeing changes. If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this service bulletin.

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 7

### BOEING SERVICE BULLETIN 737-35A1058

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 737-35A1058 Revision 1: June 1, 2000 8

### BOEING SERVICE BULLETIN 737-35A1058

J. References 1. Existing Data: a. Engineering Change Memo PRR 38275-1 b. Service Related Problem (SRP) 737-SRP-35-0014 c. 737 Maintenance Manual (AMM) Subject 35-00-00, 35-12-00, 35-12-85 2. Data supplied with this service bulletin: None 3. Installation Drawings Used in the Preparation of This Service Bulletin: Drawing Number Title 417A4000 Oxygen Tubing Instl Section 41, 43 Sta 178 - 420 417A4001 Oxygen Tubing Instl - Flight Deck 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 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 737-35A1058 Revision 1: June 1, 2000 9

### BOEING SERVICE BULLETIN 737-35A1058

BLANK PAGE

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 10

### BOEING SERVICE BULLETIN 737-35A1058

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 Part Number / Vendor Part Number Name

(a) 60B50059-611 / 38001-611 (b) Hose Assy (a) 60B50059-614 / 38001-614 (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 166th Street Cerritos, CA 90701-2203 (USA) D. Parts Necessary to Change Spares None

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 11

### BOEING SERVICE BULLETIN 737-35A1058

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 60B50059-124 DIS Hose Assy (a) 60B50059-611 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 737-35A1058 Revision 1: June 1, 2000 12

### BOEING SERVICE BULLETIN 737-35A1058

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 CAUTION: OXYGEN SYSTEM COMPONENTS REQUIRE SPECIAL CARE AND HANDLING PROCEDURES. REVIEW THE SAFETY AND MAINTENANCE PROCESSES SHOWN IN 737 AMM 35-00-00. A. Remove the oxygen stowage box as shown in 737 AMM 35-12-85 or operators equivalent procedure. B. Remove the existing conductive oxygen hoses as shown in Figure 1, 2, 3, and 4. NOTE: Ensure 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 Figure 1, 2, 3, and 4. D. Install the oxygen stowage boxes as shown in 737 AMM 35-12-85 or operators equivalent procedure. E. Functional test the crew oxygen system as shown in 737 AMM 35-12-00 or operators equivalent procedure. F. Put the airplane back to a serviceable condition.

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 13

### BOEING SERVICE BULLETIN 737-35A1058

FIGURE TABLE OF CONTENTS Title Page FIGURE 1. OXYGEN BOX HOSE TYPICAL LOCATIONS.. . . . . . . . . . . . . . . . . . . . . . . 15 FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT. . . . . . . . . . . 18 FIGURE 4. SECOND OBSERVER'S OXYGEN BOX HOSE REPLACEMENT . . .. . . . . 20

September 2, 1999 737-35A1058 Revision 1: June 1, 2000 14

### BOEING SERVICE BULLETIN 737-35A1058

SEE FIGURE 2 SEE FIGURE 3

(TYPICAL) SEE FIGURE 4

SEE FIGURE 2S92715

FIGURE 1. OXYGEN BOX HOSE TYPICAL LOCATIONS
September 2, 1999 SHEET 1 OF 1 737-35A1058 Revision 1: June 1, 2000 15

### BOEING SERVICE BULLETIN 737-35A1058

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

4 1 23S92716

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT
September 2, 1999 SHEET 1 OF 2 737-35A1058 Revision 1: June 1, 2000 16

### BOEING SERVICE BULLETIN 737-35A1058

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 35-12-85 2

-
2 Remove / Discard Hose Assy 737 AMM 35-12-85 2 Discard the Hose Assy after recording the part number. 3 Install Hose Assy 737 AMM 35-12-85 2 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 737 AMM 35-12-85 2

-

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT
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### BOEING SERVICE BULLETIN 737-35A1058

FWD



## A 4 1 FWD

3 2 A SEE



## FLIGHT COMPARTMENTS92717

FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT
September 2, 1999 SHEET 1 OF 2 737-35A1058 Revision 1: June 1, 2000 18

### BOEING SERVICE BULLETIN 737-35A1058

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 35-12-85 1

-
2 Remove / Discard Hose Assy 737 AMM 35-12-85 1 Discard the Hose Assy after recording the part number. 3 Install Hose Assy 737 AMM 35-12-85 1 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 737 AMM 35-12-85 1

-

FIGURE 3. FIRST OBSERVER'S OXYGEN BOX HOSE REPLACEMENT
September 2, 1999 SHEET 2 OF 2 737-35A1058 Revision 1: June 1, 2000 19

### BOEING SERVICE BULLETIN 737-35A1058

FWD FWD



## A 14 3 2 SEE A



## FLIGHT COMPARTMENTS92718

FIGURE 4. SECOND OBSERVER'S OXYGEN BOX HOSE REPLACEMENT
September 2, 1999 SHEET 1 OF 2 737-35A1058 Revision 1: June 1, 2000 20

### BOEING SERVICE BULLETIN 737-35A1058

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 35-12-85 1

-
2 Remove / Discard Hose Assy 737 AMM 35-12-85 1 Discard Hose Assy after recording the part number. 3 Install Hose Assy 737 AMM 35-12-85 1 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 737 AMM 35-12-85 1

-

FIGURE 4. SECOND OBSERVER'S OXYGEN BOX HOSE REPLACEMENT
September 2, 1999 SHEET 2 OF 2 737-35A1058 Revision 1: June 1, 2000 21

### Commercial Airplane Group 

# 737 Service Bulletin

Number: 737-35A1058 

## 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