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Commercial Airplane Group 757 Service Bulletin Number: 757-35A0015 Revision Transmittal SheetDate: 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
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Commercial Airplane Group 757 Service Bulletin Number: 757-35A0015 SummaryDate: 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 OXYGEN S89342 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