### Commercial Airplane Group 

# 757 Service Bulletin

Number: 757-35A0015 

## Revision Transmittal Sheet Date: September 2, 1999 Revision 2: June 15, 2000 ATA System: 3511

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 Revision 1 of this service bulletin. REASON FOR REVISION This revision is sent to advise operators of the following: The addition of the vendor equivalent oxygen hose part numbers to the Parts Necessary For Each Airplane section. 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: November 11, 1999 Revision 2: June 15, 2000

757-35A0015 Revision Transmittal Page 1 of 1

### Commercial Airplane Group 

# 757 Service Bulletin

Number: 757-35A0015 

## Summary Date: September 2, 1999 Revision 2: June 15, 2000 ATA System: 3511

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 the 757 in August of 1997. The damage occurred due to a short circuit in the Audio Select Panel. It 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) 757-SRP-35-0014 is related to this service bulletin. ACTION(PRR 54530-213) Remove the crew oxygen boxes. Replace the existing low pressure hoses with the new non-conductive hoses. Install the crew oxygen boxes. Functional test the system. EFFECTIVITY All 757 airplanes, line numbers 1 through 884, except line numbers 804, 810, 818, 839, 846, 849, and 855. 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) 2.5 2.5
MATERIAL INFORMATION None

757-35A0015 Summary Page 1 of 2

### BOEING SERVICE BULLETIN 757-35A0015



### (TYPICAL) FWD APPLICABLE BOX HOSES AS REPLACE OXYGENS89342

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 Summary Page 2 of 2

### Commercial Airplane Group 

# 757 Service Bulletin

Number: 757-35A0015 Date: September 2, 1999 Revision 2: June 15, 2000 ATA System: 3511

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 D624N001, 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 54530-213 for data about this change. Airplane Models: 757-200 757-200C 757-200PF IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER AEROMEXICO (AMX) NC066-NC071 AIR EUROPA (ARE) NA214 NA342 NA345 NA348 NA391 NA396 AIR HOLLAND CHARTER (HOL) NB071 NB073 NB133 NB137 AIR TRANSAT (AIJ) NA399 NB145-NB146 NB202 NB239 AIR 2000 (ATZ) NA022-NA023 NA397 NA441-NA443 NA447 NB131-NB132 NB134 NB321 NB329 NT232 AIRTOURS INT'L AIRWAYS (GUE) NA005-NA006 NA008 NA011 NB140 NB571 AMERICA WEST AIRLINES (AMW) NA018-NA020 NA028 NB021-NB023 NB036-NB041

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 Page 1 of 24

### BOEING SERVICE BULLETIN 757-35A0015

AMERICAN AIRLINES (AAL) ND011-ND059 ND111-ND113 ND161-ND166 ND168-ND199 NT731-NT742 AMERICAN TRANS AIR (ATA) (AAT) NA446 NC058-NC062 NT281-NT283 ANSETT WORLDWIDE AVIATION (AWW) NB167 NC972 ARKIA ISRAELI AIRLINES (ARK) NA395 AVIANCA (AVI) NB148 NB221 NB324 NB326 AZERBAIJAN AIRLINES (AHY) NT436 BOEING (TBC) NA001 BRITANNIA AIRWAYS (BRI) NA406 NB422-NB438 NT431-NT432 BRITANNIA AIRWAYS AB (TNS) NA024 NA343-NA344 NA346 NB323 BRITISH AIRWAYS (BAB) NA201-NA204 NA206-NA213 NA215-NA239 NA301-NA305 NA394 NA398 NB322 NB581-NB583 NT401-NT404 NT406 CANADA 3000 AIRLINES (ATW) NB135 NB142 NB201 NB203-NB204 NB225 CHALLENGE AIR CARGO (CHA) NC973-NC974 CHINA SOUTHERN AIRLINES (GUN) NA349 NB061-NB068 NB070 NB261-NB267 NB296 CHINA SOUTHWEST AIRLINES (XIN) NB291-NB295 NB297-NB299 NB301-NB302 NB327 NT201-NT202 CHINA XINJIANG AIRLINES (XIJ) NB325 NB328 NT231 NT381-NT383 CONDOR (CDF) NB079 NE161-NE177 CONTINENTAL AIRLINES (CAL) ND301-ND322 NT751-NT764 DELTA AIR LINES (DAL) NA501-NA586 NB001-NB004 NE008 NT701-NT710 EL AL ISRAEL AIRLINES (ELA) NB072 ND001-ND007 ND401

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 2

### BOEING SERVICE BULLETIN 757-35A0015

ESTADO NACIONAL ARGENTINO ENA (ESA) NB144 ETHIOPIAN AIRLINES (ETH) NC951 NE201-NE204 FAR EASTERN AIR TRANSPORT (FAT) NC051 NE301-NE302 NT881-NT883 FINNAIR (FIN) NT341-NT345 FLYING COLOURS (FLN) NA445 NB222-NB223 NB226-NB228 NB230 NB330-NB331 NT233-NT234 GREENLANDAIR (GRL) NA350 IBERIA AIRLINES (IBE) ND241-ND245 ND247-ND248 NT901-NT903 ICELANDAIR (ICE) NB224 NC971 ND201-ND203 NT861-NT862 L.T.E. INTERNATIONAL AIRWAYS (LTE) NA191-NA193 LAPA ARGENTINA (LAZ) NC052 NC073 LTU (LTU) NA025-NA026 NA194-NA199 NB446 NB561 NT411-NT412 MEXICANA AIRLINES (CMA) NC056-NC057 NC072 NT376-NT378 MEXICO'S PRESIDENTIAL AIRCRAFT (MXG) NA027 MID EAST JET (SKL) NC161 MONARCH AIRLINES (MON) NA401-NA405 NA407-NA408 NASA (NAS) NA002 NATIONAL AIRLINES, INC. (NAB) NA341 NA347 NA351 NA444 NB139 NB421 ND246 NT405 NT407-NT409 NORTH AMERICAN AIRLINES (NNA) NB236 NT239 NORTHWEST AIRLINES (NWA) NC001-NC033 NE311-NE325

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 3

### BOEING SERVICE BULLETIN 757-35A0015

PRIVATAIR (PTS) NB136 ROYAL AIR MAROC (RAM) NC041-NC042 ROYAL AIRLINES (ROY) NA352 NA392-NA393 ROYAL BRUNEI AIRLINES (RBA) NB051-NB052 ROYAL NEPAL AIRLINES (RNA) ND891 ND895 SAUDI ROYAL FLIGHT (SRF) NB168 SHANGHAI AIRLINES (SHA) NE001-NE007 STAR AIR TOURS (SRT) NA205 NB053 STARFLITE CORPORATION (ZKX) NB147 TACV-CABO VERDE AIRLINES (TCV) NC074 TAESA (TES) NB138 THE YUCAIPA COMPANIES (YUC) NB312 TRANSAVIA AIRLINES (TAV) NB451-NB454 TURKMENISTAN AIRLINES (TUE) NB143 NB161-NB162 TWA (TWA) NC075-NC084 NC091-NC094 NT351-NT357 NT371 UNITED AIRLINES (UAL) NE011-NE088 NE091-NE094 NE141-NE150 NT791-NT796 UPS (UPS) NC901-NC950 NS601-NS616 NT001-NT009 US AIR FORCE (USF) NP901-NP904 US AIRWAYS (USA) NA003-NA004 NA007 NA009-NA010 NA012-NA016 NA021 NB501-NB523

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 4

### BOEING SERVICE BULLETIN 757-35A0015

UZBEKISTAN AIRWAYS (UZB) NC151 NT441 VULCAN NORTHWEST (VUL) NB141 NB311 XIAMEN AIRLINES (XIA) ND221-ND225
IDENTIFICATION BY VARIABLE NUMBER NA001-NA028 NA191-NA199 NA201-NA239 NA301-NA305 NA341-NA352 NA391-NA399 NA401-NA408 NA441-NA447 NA501-NA586 NB001-NB004 NB021-NB023 NB036-NB041 NB051-NB053 NB061-NB073 NB079 NB131-NB148 NB161-NB162 NB166-NB168 NB201-NB204 NB221-NB228 NB230 NB236 NB239 NB261-NB267 NB291-NB299 NB301-NB302 NB311-NB312 NB321-NB331 NB421-NB438 NB446 NB451-NB454 NB501-NB523 NB561 NB571 NB581-NB583 NC001-NC033 NC041-NC042 NC051-NC052 NC056-NC062 NC066-NC084 NC091-NC094 NC151 NC161 NC901-NC951 NC971-NC974 ND001-ND007 ND011-ND059 ND111-ND113 ND161-ND199 ND201-ND203 ND221-ND225 ND241-ND248 ND301-ND322 ND401 ND891 ND895 NE001-NE008 NE011-NE088 NE091-NE094 NE141-NE150 NE161-NE177 NE201-NE204 NE301-NE302 NE311-NE325 NP901-NP904 NS601-NS616 NT001-NT009 NT201-NT202 NT231-NT234 NT239 NT281-NT283 NT341-NT345 NT351-NT357 NT371 NT376-NT378 NT381-NT383 NT401-NT409 NT411-NT412 NT431-NT432 NT436 NT441 NT701-NT710 NT731-NT742 NT751-NT764 NT791-NT796 NT861-NT862 NT881-NT883 NT901-NT903 2. Spares Affected None

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 5

### BOEING SERVICE BULLETIN 757-35A0015

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 the 757 in August of 1997. The damage occurred due to a short circuit in the Audio Select Panel. It 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 operators of a revision to the airplane effectivities. 757-300 airplane line numbers 804, 810, 818, 839, 846, 849, and 855 were removed. This is due to Joint Aviation Authority (JAA) certification issues, and therefore, the 757-200 and the 757-300 airplanes require separate service bulletins. 757-300 airplanes, line numbers 804, 810, 818, 839, 846, 849, and 855 are covered in service bulletin 757-35A0016. Revision 2 is sent to advise operators of the following: The addition of the vendor equivalent oxygen hose part numbers to the Parts Necessary For Each Airplane. Boeing Service Related Problem (SRP) 757-SRP-35-0014 is related to this service bulletin. D. Description Remove the crew oxygen boxes. Replace the existing low pressure hoses with the new non-conductive hoses. Install the crew oxygen boxes. Functional test the system. Revision 2 - 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 757-35A0015 Revision 2: June 15, 2000 6

### BOEING SERVICE BULLETIN 757-35A0015

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

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 7

### BOEING SERVICE BULLETIN 757-35A0015

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 .75 .75 Replace hoses 1 1.0 1.0 Restore 1 .75 .75 TOTAL FOR EACH AIRPLANE 2.5 2.5 H. Weight and Balance Changes None I. Electrical Load Data Not changed

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 8

### BOEING SERVICE BULLETIN 757-35A0015

J. References 1. Existing Data: a. Engineering Change Memo PRR 54530-213 b. Service Related Problem (SRP) 757-35-0014 c. 757 Maintenance Manual (AMM) Subject 12-15-08, 20-41-00, 35-00-00, 35-11-00, 35-11-51 d. Boeing Service Bulletin 757-35A0016, "OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose Replacement" 2. Data supplied with this service bulletin: None 3. Installation Drawings Used in the Preparation of This Service Bulletin: Drawing Number Title 232N8001 OXYGEN MASK INSTL - CREW 208N0000 MANAGEMENT COLLECTOR - TUBING INSTL - DWG TREE AND GENERAL NOTES 208N4132 TUBING INSTL - UPPER R CAB STA 199.09 - 297 208N4133 TUBING INSTL - UPPER L CAB STA 199.09 - 297 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 757 Maintenance Manual 35-11 757 Illustrated Parts Catalog 35-11 L. Interchangeability and Intermixability of Parts Refer to Paragraph 2.E., Existing Parts Accountability, for interchangeability and intermixability information.

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 9

### BOEING SERVICE BULLETIN 757-35A0015

BLANK PAGE

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 10

### BOEING SERVICE BULLETIN 757-35A0015

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) 60B50059-606 / 38001-606 (b) Hose Assy (a) 60B50059-607 / 38001-607 (b) Hose Assy (a) For hose quantity requirements, see Illustrated Parts Catalog 35-11 for customer specific configuration. (b) HydraFlow (V24984) 13259 East 166th Street Cerritos, CA 90701-2203 (USA) D. Parts Necessary to Change Spares None 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 60B50059-70 DIS Hose Assy (a) 60B50059-606 S A 60B50059-81 DIS Hose Assy (a) 60B50059-607 S A (a) For hose quantity requirements, see Illustrated Parts Catalog 35-11 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.

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 11

### BOEING SERVICE BULLETIN 757-35A0015

(Continued) 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 757-35A0015 Revision 2: June 15, 2000 12

### BOEING SERVICE BULLETIN 757-35A0015

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. Refer to the Boeing Standard Wiring Practices Manuals 20-10-11 and 20-10-12 for the wire installation procedures. 3. 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 THE 757 AMM 35-00-00. A. Remove the oxygen stowage boxes as shown in 757 AMM 35-11-51 or operator's equivalent procedure. B. Remove the existing conductive oxygen hoses as shown in Figures 1, 2, 3, 4, and 5. 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, 4, and 5. D. Install the oxygen stowage boxes as shown in 757 AMM 35-11-51 or operator's equivalent procedure. E. Functional test the crew oxygen system as shown in 757 AMM 35-11-00, "Operational Test - Crew Oxygen Mask/Regulator" or operator's equivalent procedure. F. Put the airplane back to a serviceable condition.

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 13

### BOEING SERVICE BULLETIN 757-35A0015

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. RIGHT OBSERVER'S SEAT OXYGEN BOX HOSE REPLACEMENT. . . . . 20 FIGURE 4. LEFT OBSERVER'S SEAT OXYGEN BOX HOSE REPLACEMENT .. . . . . 22 FIGURE 5. SUPERNUMERARY OXYGEN BOX HOSE REPLACEMENT.. . . . . . . . . . . 24

September 2, 1999 757-35A0015 Revision 2: June 15, 2000 14

### BOEING SERVICE BULLETIN 757-35A0015

FWD FIGURE 4 FIGURE 3 FIGURE 5

FIGURE 2 SEE SEE SEE
SEE

FIGURE 2 SEES89304

FIGURE 1. OXYGEN BOX HOSE TYPICAL LOCATIONS September 2, 1999 SHEET 1 OF 1 757-35A0015 Revision 2: June 15, 2000 15

### BOEING SERVICE BULLETIN 757-35A0015



### FWD B SEE SEE A

FLIGHT COMPARTMENTS89323

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT September 2, 1999 SHEET 1 OF 4 757-35A0015 Revision 2: June 15, 2000 16

### BOEING SERVICE BULLETIN 757-35A0015

4 3 2



## A CAPTAIN'S CONSOLE 1

INBD UP FWDS89324

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT September 2, 1999 SHEET 2 OF 4 757-35A0015 Revision 2: June 15, 2000 17

### BOEING SERVICE BULLETIN 757-35A0015

1 23



## FIRST OFFICER'S CONSOLE 4



## B INBD UP FWDS89325

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT September 2, 1999 SHEET 3 OF 4 757-35A0015 Revision 2: June 15, 2000 18

### BOEING SERVICE BULLETIN 757-35A0015

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 757 AMM 35-11-51 2
- 2 Remove / Discard Hose Assy 757 AMM 35-11-51 2 Discard the Hose Assy after recording the part number. 3 Install Hose Assy 757 AMM 35-11-51 2 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 757 AMM 35-11-51 2
-

FIGURE 2. CAPTAIN AND FIRST OFFICER'S OXYGEN BOX HOSE REPLACEMENT September 2, 1999 SHEET 4 OF 4 757-35A0015 Revision 2: June 15, 2000 19

### BOEING SERVICE BULLETIN 757-35A0015

FWD



## A SEE A

3 2

4 1 FLIGHT COMPARTMENTS89330

FIGURE 3. RIGHT OBSERVER'S SEAT OXYGEN BOX HOSE REPLACEMENT September 2, 1999 SHEET 1 OF 2 757-35A0015 Revision 2: June 15, 2000 20

### BOEING SERVICE BULLETIN 757-35A0015

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 757 AMM 35-11-51 1
- 2 Remove / Discard Hose Assy 757 AMM 35-11-51 1 Discard the Hose Assy after recording the part number. 3 Install Hose Assy 757 AMM 35-11-51 1 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 757 AMM 35-11-51 1
-

FIGURE 3. RIGHT OBSERVER'S SEAT OXYGEN BOX HOSE REPLACEMENT September 2, 1999 SHEET 2 OF 2 757-35A0015 Revision 2: June 15, 2000 21

### BOEING SERVICE BULLETIN 757-35A0015

FWD SEEA

1 2
4 3



## A FLIGHT COMPARTMENT

FWDS89334

FIGURE 4. LEFT OBSERVER'S SEAT OXYGEN BOX HOSE REPLACEMENT September 2, 1999 SHEET 1 OF 2 757-35A0015 Revision 2: June 15, 2000 22

### BOEING SERVICE BULLETIN 757-35A0015

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 757 AMM 35-11-51 1
- 2 Remove / Discard Hose Assy 757 AMM 35-11-51 1 Discard the Hose Assy after recording the part number. 3 Install Hose Assy 757 AMM 35-11-51 1 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 757 AMM 35-11-51 1
-

FIGURE 4. LEFT OBSERVER'S SEAT OXYGEN BOX HOSE REPLACEMENT September 2, 1999 SHEET 2 OF 2 757-35A0015 Revision 2: June 15, 2000 23

### BOEING SERVICE BULLETIN 757-35A0015

14 2 3

FWDS89337

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 757 AMM 35-11-51 1
- 2 Remove / Discard Hose Assy 757 AMM 35-11-51 1 Discard the Hose Assy after recording the part number. 3 Install Hose Assy 757 AMM 35-11-51 1 See Existing Parts Accountability for applicable Hose Assy. 4 Install / Kept Oxygen Box 757 AMM 35-11-51 1
-

FIGURE 5. SUPERNUMERARY OXYGEN BOX HOSE REPLACEMENT September 2, 1999 SHEET 1 OF 1 757-35A0015 Revision 2: June 15, 2000 24

### Commercial Airplane Group 

# 757 Service Bulletin

Number: 757-35A0015 

## Evaluation Form Date: September 2, 1999 Revision 2: June 15, 2000 ATA System: 3511 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