# Boeing Alert Service Bulletin 747-35A2101: Revision 1

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- Document: [Boeing Alert Service Bulletin 747-35A2101](https://openairdocs.org/service-documents/boeing/747-35a2101.md)
- Title as filed: U.S. DOT/FAA - Boeing Service Bulletin
- Pages: 40
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- Page: https://openairdocs.org/service-documents/boeing/747-35a2101/file/0dd5a5994f9a

## Text

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### Page 1

October 28, 1999
Revision 1: May 15, 2003 747-35A2101
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 1o f4 0
Commercial
Airplane
Group 747
Service Bulletin
Number: 747-35A2101
Date: October 28, 1999
Revision 1: May 15, 2003
ATA System: 3510
CAS
SUBJECT: OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose
Replacement
BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET
Copyright © 1999 The Boeing Company
Unpublished Work - All Rights Reserved
Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable
subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.
This document includes proprietary information owned by The Boeing Company and/or one or more third
parties. Treatment of the document and the information it contains is governed by contract with Boeing. For
more information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, BBJ, DC-8, DC-9,
DC-10, MD-10, MD-11, MD-80, MD-88, MD-90, and the red-white-and-blue Boeing livery are all trademarks
owned by The Boeing Company; and no trademark license is granted in connection with this document unless
provided in writing by Boeing.

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BOEING SERVICE BULLETIN 747-35A2101
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### Page 3

October 28, 1999
Revision 1: May 15, 2003 747-35A2101
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 3o f4 0
Commercial
Airplane
Group 747
Service Bulletin
Number: 747-35A2101 Revision Transmittal Sheet
Date: October 28, 1999
Revision 1: May 15, 2003
ATA System: 3510
CAS
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
More work is necessary on airplanes changed as shown in the initial release of this service bulletin.
If the protective tape was not applied to the hoses, apply the tape to all the new flight compartment hoses at the
next available opportunity.
REASON FOR REVISION
This revision is sent to advise affected operators of the following:
• The NOTE in the Background and Reason section was revised.
 The addition of the vendor equivalent, oxygen hose, part numbers and the addition of the tape, part
number in the Parts Necessary For Each Airplane section.
 The addition of a NOTE at the beginning of the Accomplishment Instructions to clarify which oxygen
hoses are to be replaced.
 The addition of instructions to remove and install the mask and demand regulator, along with the oxygen
boxes.
 The addition of a step in the Accomplishment Instructions to apply protective tape to the hoses.
 The addition of Figure 2 for the protective tape application.
 The data given in Information Notice 747-35A2101 IN 01 is 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: October 28, 1999
Revision 1: Not Released

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BOEING SERVICE BULLETIN 747-35A2101
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### Page 5

October 28, 1999
Revision 1: May 15, 2003 747-35A2101
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 5o f4 0
Commercial
Airplane
Group 747
Service Bulletin
Number: 747-35A2101 Summary
Date: October 28, 1999
Revision 1: May 15, 2003
ATA System: 3510
CAS
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.
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 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.
Boeing Service Related Problem (SRP) 747-SRP-35-0014 is related to this service bulletin.
Note: Operators affected by Boeing Service Bulletin 747-35A2088 should follow the flight deck hose routing
and clearance instructions provided by Service Bulletin 747-35A2088. All other operators should follow
the instructions in Service Bulletin 747-35A2101.
ACTION (PRR 85900-226)
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 747 airplanes line number 1 through 1229 as applicable.

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BOEING SERVICE BULLETIN 747-35A2101
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
MATERIAL INFORMATION
None.
Airplanes Total Task Hours Elapsed Hours
747 Classics 2.5 2.5
747-400/D/F 1.75 1.75

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BOEING SERVICE BULLETIN 747-35A2101
(TYPICAL CONFIGURATION)
HOSES AS APPLICABLE
REPLACE OXYGEN BOX
HOSES AS APPLICABLE
REPLACE OXYGEN BOX
(TYPICAL CONFIGURATION)
747-400 FLIGHT COMPARTMENT
747 FLIGHT COMPARTMENT
S93303

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### Page 9

October 28, 1999
Revision 1: May 15, 2003 747-35A2101
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 9o f4 0
Commercial
Airplane
Group 747
Service Bulletin
Number: 747-35A2101
Date: October 28, 1999
Revision 1: May 15, 2003
ATA System: 3510
CAS
SUBJECT: OXYGEN - Crew Oxygen - Crew Oxygen System Low Pressure Flex Hose
Replacement
1. PLANNING INFORMATION
A. Effectivity
1. Airplanes
Refer to Service Bulletin Index Document D6-30300 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 85900-226 for data about this change.
Airplane models:
747-100 747-100B 747-100B SUD 747-200B
747-200C 747-200F 747-300 747-400
747-400D 747-400F 747SP 747SR
IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER
AAR AIRCRAFT SALES AND LEASING (AFD)
1 RA313 RA315 RB681–RB682 RD134
AERO CONTROLS (AEO)
1 RA722–RA723
AEROLINEAS ARGENTINAS (ARG)
1 RD053 RD122–RD127
AGES AIRCRAFT SALES & LEASING (AGJ)
1 RB004
AIR ATLANTA ICELANDIC (AID)
1 RA526 RA534 RB411–RB413 RD141
RD143 RD352–RD355 RD414 RD472–RD473
RD647–RD648 RD771 RS332–RS333

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BOEING SERVICE BULLETIN 747-35A2101
AIR CANADA (ACN)
1 RA750 RD531 RT101–RT103 RT701–RT702
RU059
AIR CHINA (BEJ)
1 RD781–RD783 RM811–RM813 RR451 RT031–RT035
RT878–RT880
AIR FRANCE (AFA)
1 RA253 RD271–RD272 RD651–RD655 RD657–RD659
RD721–RD722 RD791–RD792 RR302 RR304
RR306–RR309 RR332 RS751–RS752 RT071–RT075
RT121 RT591 RT711–RT716
AIR GABON (GBN)
1 RD661
AIR INDIA (AIN)
1 RA728–RA731 RS781–RS782 RU001–RU006
AIR MADAGASCAR (MAD)
1 RD561
AIR NAMIBIA (NAM)
1R T 1 3 7
AIR NEW ZEALAND (ANZ)
1 RM082 RM191–RM192 RT671–RT673 RT703
RT932
AIR PACIFIC (APC)
1 RD518
AIR PULLMANTUR (PUL)
1R S 3 3 1
AIRFREIGHT EXPRESS LIMITED (AIF)
1 RD442 RR221
ALBARAKA (AAB)
1R B 1 0 2
ALITALIA (ALI)
1 RD751 RR561
ALL NIPPON AIRWAYS (ANA)
1 RB689–RB695 RB697 RD231–RD232 RM231–RM232
RT751–RT757 RT776–RT777 RU831–RU841
AMIRI FLIGHT (ABD)
1 RH102 RM084

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BOEING SERVICE BULLETIN 747-35A2101
ASIANA AIRLINES (AAR)
1 RM071 RM861 RR746–RR748 RT131–RT136
RU032
ATLAS AIR (TLS)
1 RB683–RB685 RD044 RD361–RD366 RD411–RD412
RD641–RD643 RD646 RD691–RD692 RD752–RD755
RJ333 RM892–RM899 RR301 RR303
RS721–RS722 RS762
AVIATION EXPOSURE MANAGEMENT (EXU)
1 RD131–RD132
AVIATION PARTNERS L.L.C. (APM)
1 RS241
BAHRAIN ROYAL FLIGHT (BHR)
1 RG009
BOEING (TBC)
1 RB688 RR222–RR223
BOEING AIRCRAFT HOLDING CO. (BHC)
1 RD181 RD451–RD456
BOEING CAPITAL CORPORATION (ZMF)
1 RB687 RD072 RJ132 RR201
BRITISH AIRWAYS (BAB)
1 RD139 RD311 RM096–RM097 RM136–RM145
RM261–RM264 RT471–RT499 RU121–RU132
C.A.L. CARGO AIR LINES (CRG)
1 RJ331–RJ332
C.I.T. LEASING CORPORATION (TCI)
1 RD047
CAMEROON AIRLINES (CAM)
1 RS238
CARGOLUX AIRLINES (CLX)
1 RM881–RM883 RR701 RR721–RR724
CATHAY PACIFIC AIRWAYS (CAT)
1 RD358 RD581–RD583 RR441–RR442 RR531
RR951–RR952 RT451–RT469
CHINA AIRLINES (CHI)
1 RD551 RM021–RM024 RR521–RR522 RT631–RT634
RT636–RT640

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BOEING SERVICE BULLETIN 747-35A2101
CONTINENTAL AIRLINES (CAL)
1 RA561 RB005–RB006
CORSAIR (COR)
1 RA023 RA675 RG124 RS233
RS235 RS237 RS239–RS240
DRAGONAIR (DRG)
1 RS741 RS743 RS771
DUBAI AIR WING (DAW)
1 RD622 RG191 RG193
EGYPTAIR (EGP)
1 RS731–RS732
EL AL ISRAEL AIRLINES (ELA)
1 RA784 RB007 RJ152 RM091
RR225–RR226 RU081–RU083
EUROPEAN AVIATION AIR CHARTER (EUL)
1 RD135–RD138 RD140
EVA AIR (EVA)
1 RM116–RM117 RT161–RT168 RT951–RT955
EVERGREEN INTERNATIONAL A/L (EVR)
1 RA004 RA028 RA631 RA633
RB604 RB607 RD041–RD043 RJ131
RJ133
FINOVA (GRB)
1 RA015 RA651 RS761
FLEET CAPITAL LEASING (SBC)
1 RA106 RD001–RD002
FLIGHTPLAN INTERNATIONAL (FLP)
1R A 0 0 3
GARUDA INDONESIA (GIA)
1 RD421–RD424 RT931 RU061–RU062
GE (GEC)
1R A 0 1 6
GE CAPITAL CORPORATION (GEF)
1 RA005 RA007 RA013 RA027
RA634

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BOEING SERVICE BULLETIN 747-35A2101
GENERIC EMBARGOED CUSTOMER (YWV)
1 RA101–RA103 RA112 RA161–RA163 RA303
RA535 RA537 RG095 RG171–RG172
RJ301–RJ303 RR001–RR004
GLOBAL AIR LEASING (GAO)
1 RG164
GLOBAL PEACE INITIATIVE (GPI)
1 RG174
GLOBAL SUPPLY SYSTEMS (GSS)
1R M 8 9 1
GOVERNMENT OF JAPAN (JAG)
1 RT681–RT682
HM THE SULTAN'S FLIGHT (BWN)
1R T 4 4 0
HYDRO AIR (HYR)
1 RJ151
IBERIA AIRLINES (IBE)
1 RA585 RD431–RD435
IRAN AIR (IRN)
1 RB711 RD681–RD682 RG101–RG104
JAPAN AIRLINES (JAL)
1 RA528 RA543–RA548 RB723 RD055
RD221–RD227 RM126–RM129 RM316 RR262
RR264–RR267 RR361–RR362 RS001–RS002 RS251–RS259
RS265–RS268 RT641–RT657 RT861–RT864 RT966–RT967
RU801–RU809
JAPAN ASIA AIRWAYS (JAA)
1 RS263
JUMBO JET LEASING (JJL)
1 RA217 RA532–RA533 RA539 RA541
K.B.A. FOUNDATION (KBA)
1R T 8 7 7
KABO AIR (KAB)
1 RA305–RA306 RA316 RA501–RA502 RA560
RB008–RB009 RD121
KALITTA AIR (KAC)
1 RA402 RA524 RA635 RA749
RD082–RD083 RD201 RD621 RD623
RR261

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BOEING SERVICE BULLETIN 747-35A2101
KALITTA LEASING (KAA)
1R B 7 2 1
KHALIFA AIRWAYS (KHL)
1R T 8 7 6
KLM - ROYAL DUTCH AIRLINES (KLM)
1 RD381–RD383 RD601–RD607 RM801 RS711–RS713
RT001–RT014 RT531–RT535
KOREAN AIR (KAL)
1 RM011–RM012 RM871 RR022–RR025 RR861–RR862
RS292 RS786 RT061 RT571–RT588
RT590 RT811–RT814
KUWAIT AIRWAYS (KUW)
1 RD202 RD204 RT151
LOGISTIC AIR, INC. (LGA)
1R B 7 2 2
LUFTHANSA GERMAN AIRLINES (DLH)
1 RD291–RD292 RD649 RD772–RD775 RM001–RM002
RR202–RR206 RT041–RT047 RT431–RT439 RT441–RT447
MALAYSIA AIRLINES (MAS)
1 RD142 RD144 RM036–RM038 RT021–RT022
RT743–RT750 RU016–RU017
MARTINAIR HOLLAND (MTH)
1 RJ321–RJ322 RR310
MK AIRLINES (MKA)
1 RD441 RD741 RR224 RR336
RR421
NASA (NAS)
1R A 9 0 8 R B 6 0 1
NIPPON CARGO AIRLINES (NCA)
1 RB696 RD233–RD235 RD461 RR551–RR556
NORTHWEST AIRLINES (NWA)
1 RA370–RA373 RD056–RD057 RD241–RD243 RD251–RD262
RD301–RD302 RM241–RM243 RR005 RR341–RR345
RR431–RR432 RR503 RR566 RS701–RS702
RT401–RT410
OMAN ROYAL FLIGHT (RFO)
1 RG161 RG163
ORIENT THAI AIRLINES (OTH)
1R A 5 2 7 R A 5 4 0

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BOEING SERVICE BULLETIN 747-35A2101
PAKISTAN INT'L AIRLINES (PIA)
1 RD003–RD004 RD101–RD104 RD701–RD702 RS301–RS306
PANAIR (PNR)
1 RG122
PEGASUS AVIATION, INC. (PSS)
1 RB010 RD513
PHILIPPINE AIRLINES (PAL)
1 RD171–RD172 RD413 RT152 RU051–RU052
RU060
POLAR AIR CARGO (PAO)
1 RA726 RA910 RA914 RD425–RD426
RD592 RR501 RR504
PRATT & WHITNEY ENGINE SERVICE (PWE)
1 RG212–RG213
QANTAS (QAN)
1 RD519 RS271–RS276 RT551–RT568 RT741–RT742
RU031
ROYAL AIR MAROC (RAM)
1 RD671 RT717
SAUDI ARABIAN AIRLINES (SVA)
1 RB741–RB746 RB748 RH121 RM156–RM157
RR526 RS311–RS320 RU101–RU102
SAUDI ROYAL FLIGHT (SRF)
1 RH101 RH122 RS699
SECURITY CUSTOMER (UO1)
1 RB013–RB016 RD166–RD167
SINGAPORE AIRLINES (SIA)
1 RM851–RM852 RR851–RR856 RT501–RT530 RT831–RT835
RT837
SOUTH AFRICAN AIRWAYS (SAA)
1 RB071–RB075 RG121 RG123 RG125
RM081 RM083 RM146–RM147 RS211–RS212
RS221–RS222 RS232 RS236 RT781–RT784
SOUTHERN AIR (SOF)
1 RD182 RR305
SYRIANAIR (SYR)
1 RG141–RG142

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BOEING SERVICE BULLETIN 747-35A2101
TAAG (ANGOLA AIRLINES) (ANG)
1R S 7 0 3 R S 7 4 2
TAG AVIATION (TAG)
1 RG173
THAI AIRWAYS INTERNATIONAL (TII)
1 RM026–RM027 RS341–RS342 RT691–RT699 RT801–RT803
TRANSJET AIRWAYS (TSX)
1 RB001 RD045–RD046
UNITED AIRLINES (UAL)
1 RA903 RA906–RA907 RB011 RD516
RG091 RM166–RM176 RT411–RT412 RT601–RT630
UNITED TECHNOLOGIES P & W (UTC)
1R G 2 1 1
UPS (UPS)
1 RA026 RA029 RA033 RA901–RA902
RA911–RA913 RA915–RA916 RB421 RB605
RD051–RD052 RD054 RD058–RD059 RD571
RD593
UT FINANCE CORPORATION (ZZJ)
1R A 5 4 2
VIRGIN ATLANTIC AIRWAYS (VAA)
1 RD356–RD357 RD471 RD474–RD475 RM051
RT945–RT949
WINGS WORLD WIDE (WWW)
1 RG221–RG222
WORLDWIDE AIRCRAFT HOLDING CO. (WAH)
1 RG008
YEMENIA (YEM)
1 RG162
IDENTIFICATION BY VARIABLE NUMBER
Variable Group
RA001–RA034 1
RA101–RA115 1
RA161–RA164 1
RA201–RA203 1
RA216–RA217 1
RA245–RA246 1

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BOEING SERVICE BULLETIN 747-35A2101
RA251–RA266 1
RA301–RA318 1
RA351–RA360 1
RA369–RA373 1
RA401–RA418 1
RA501–RA502 1
RA521–RA528 1
RA532–RA548 1
RA551–RA552 1
RA559–RA561 1
RA581–RA582 1
RA585 1
RA601–RA602 1
RA631–RA635 1
RA651–RA652 1
RA671–RA677 1
RA701–RA702 1
RA721–RA731 1
RA741–RA745 1
RA749–RA750 1
RA761–RA762 1
RA781–RA784 1
RA901–RA916 1
RB001–RB016 1
RB041–RB044 1
RB071–RB075 1
RB101–RB102 1
RB411–RB413 1
RB421 1
RB601–RB607 1
RB681–RB697 1
RB711 1
RB721–RB723 1
RB741–RB748 1
RD001–RD004 1
RD021–RD022 1
RD041–RD059 1
RD071–RD072 1
RD081–RD083 1
Variable Group

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BOEING SERVICE BULLETIN 747-35A2101
RD091–RD092 1
RD101–RD104 1
RD121–RD127 1
RD131–RD144 1
RD166–RD167 1
RD171–RD172 1
RD181–RD183 1
RD201–RD204 1
RD221–RD227 1
RD231–RD235 1
RD241–RD243 1
RD251–RD262 1
RD271–RD272 1
RD291–RD292 1
RD301–RD302 1
RD311 1
RD351–RD358 1
RD361–RD366 1
RD381–RD383 1
RD411–RD414 1
RD421–RD426 1
RD431–RD435 1
RD441–RD442 1
RD451–RD456 1
RD461 1
RD471–RD475 1
RD513–RD519 1
RD531–RD533 1
RD551 1
RD561 1
RD571 1
RD581–RD583 1
RD591–RD593 1
RD601–RD607 1
RD621–RD623 1
RD641–RD649 1
RD651–RD659 1
RD661 1
RD671 1
Variable Group

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BOEING SERVICE BULLETIN 747-35A2101
RD681–RD682 1
RD691–RD692 1
RD701–RD702 1
RD721–RD722 1
RD741–RD742 1
RD751–RD755 1
RD761 1
RD771–RD775 1
RD781–RD783 1
RD791–RD792 1
RE001 1
RG001–RG009 1
RG091 1
RG095 1
RG101–RG104 1
RG121–RG126 1
RG141–RG142 1
RG161–RG164 1
RG171–RG174 1
RG191–RG193 1
RG211–RG213 1
RG221–RG222 1
RH101–RH102 1
RH111–RH112 1
RH121–RH122 1
RJ131–RJ133 1
RJ151–RJ152 1
RJ301–RJ303 1
RJ321–RJ322 1
RJ331–RJ333 1
RM001–RM002 1
RM011–RM012 1
RM021–RM024 1
RM026–RM027 1
RM036–RM038 1
RM051 1
RM071 1
RM081–RM084 1
RM091 1
Variable Group

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BOEING SERVICE BULLETIN 747-35A2101
RM096–RM097 1
RM116–RM117 1
RM126–RM129 1
RM136–RM147 1
RM156–RM157 1
RM166–RM176 1
RM191–RM192 1
RM231–RM232 1
RM241–RM243 1
RM261–RM264 1
RM316 1
RM801 1
RM811–RM813 1
RM851–RM852 1
RM861 1
RM871 1
RM881–RM883 1
RM891–RM899 1
RR001–RR005 1
RR021–RR025 1
RR031 1
RR201–RR206 1
RR221–RR226 1
RR261–RR267 1
RR301–RR310 1
RR331–RR332 1
RR336 1
RR341–RR345 1
RR361–RR362 1
RR421–RR422 1
RR431–RR432 1
RR441–RR442 1
RR451 1
RR501–RR504 1
RR521–RR522 1
RR526 1
RR531 1
RR551–RR556 1
RR561 1
Variable Group

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BOEING SERVICE BULLETIN 747-35A2101
RR566 1
RR701 1
RR721–RR724 1
RR746–RR748 1
RR851–RR856 1
RR861–RR862 1
RR951–RR952 1
RS001–RS002 1
RS201 1
RS211–RS212 1
RS221–RS222 1
RS231–RS241 1
RS251–RS259 1
RS263 1
RS265–RS268 1
RS271–RS276 1
RS291–RS292 1
RS301–RS306 1
RS311–RS320 1
RS331–RS333 1
RS341–RS342 1
RS699 1
RS701–RS703 1
RS711–RS713 1
RS721–RS722 1
RS731–RS732 1
RS741–RS743 1
RS751–RS752 1
RS761–RS762 1
RS771 1
RS781–RS782 1
RS786 1
RT001–RT014 1
RT021–RT022 1
RT031–RT035 1
RT041–RT047 1
RT061 1
RT071–RT075 1
RT101–RT103 1
Variable Group

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BOEING SERVICE BULLETIN 747-35A2101
RT121 1
RT131–RT137 1
RT151–RT152 1
RT161–RT168 1
RT401–RT412 1
RT431–RT447 1
RT451–RT469 1
RT471–RT499 1
RT501–RT535 1
RT551–RT568 1
RT571–RT591 1
RT601–RT657 1
RT671–RT673 1
RT681–RT682 1
RT691–RT699 1
RT701–RT704 1
RT711–RT717 1
RT741–RT757 1
RT776–RT777 1
RT781–RT784 1
RT801–RT803 1
RT811–RT814 1
RT831–RT837 1
RT861–RT864 1
RT876–RT880 1
RT931–RT932 1
RT945–RT949 1
RT951–RT955 1
RT966–RT967 1
RU001–RU006 1
RU016–RU017 1
RU031–RU032 1
RU051–RU052 1
RU059–RU062 1
RU081–RU083 1
RU101–RU102 1
RU121–RU132 1
RU801–RU809 1
RU831–RU841 1
Variable Group

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BOEING SERVICE BULLETIN 747-35A2101
2. Spares Affected
None.
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.
One operator has reported damaged oxygen supply lines 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 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.
Revision 1 is sent to advise affected operators of the following:
 The NOTE in the Background and Reason section was revised.
 The addition of the vendor equivalent oxygen hose part numbers and the addition of the tape
part number in the Parts Necessary For Each Airplane section.
 The addition of a NOTE at the beginning of the Accomplishment Instructions to clarify which
oxygen hoses are to be replaced.
 The addition of instructions to remove and install the mask and demand regulator along with the
oxygen boxes
 The addition of a step in the Accomplishment Instructions to apply protective tape to the hoses.
 The addition of Figure 2 for the protective tape application.
 The data given in Information Notice 747-35A2101 IN 01 is included in this revision.
Boeing Service Related Problem (SRP) 747-SRP-35-0014 is related to this service bulletin.
Note: Operators affected by Boeing Service Bulletin 747-35A2088 should follow the flight deck hose
routing and clearance instructions provided by Service Bulletin 747-35A2088. All other
operators should follow the instructions in Service Bulletin 747-35A2101.
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 - More work is necessary on airplanes changed as shown in the initial release of this
service bulletin.

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BOEING SERVICE BULLETIN 747-35A2101
If the protective tape was not applied to the hoses, apply the tape to all the new flight compartment
hoses at the next available opportunity.
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.
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.
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
— T i m et oe x a m i n et h ew o r k
— Time to cure the materials
— T i m et om a k et h ep a r t s
— Time to find the tools.
For 747 Classic Airplanes:
For 747-400/D/F Airplanes:
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
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

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BOEING SERVICE BULLETIN 747-35A2101
H. Weight and Balance Changes
None.
I. Electrical Load Data
Not changed.
J. References
1. Existing Data:
a. Engineering Change Memo PRR 85900-226
b. Service Related Problem (SRP) 747-SRP-35-0014
c. 747 Maintenance Manual (AMM) Subject 35-00-00, 35-11-00, 35-11-07, 35-11-18
d. Boeing Service Bulletin 747-35A2088, “OXYGEN - Crew Oxygen Systems - Prevent
Chafing of Oxygen Box Flexible Hose and Microphone Wire”
2. Data supplied with this Service Bulletin:
None.
3. Installation Drawings Used in the Preparation of this Service Bulletin:
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 Affected
L. Interchangeability and Intermixability of Parts
Refer to Paragraph 2.C., Parts Necessary For Each Airplane, for interchangeability and
intermixability information.
Drawing Number Title
232U7409 Oxygen Installation - Navigator, Modification
232U8002 Equipment Installation - Crew Oxygen
65B40025 Tubing Instl - Crew Oxygen
65B45015 Tubing Instl - Crew Oxygen (MOD)
Publication Chapter-Section
747 Illustrated Parts Catalog 35-11

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BOEING SERVICE BULLETIN 747-35A2101
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BOEING SERVICE BULLETIN 747-35A2101
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/Parts:
None.

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BOEING SERVICE BULLETIN 747-35A2101
2. Parts and Materials Supplied by the Operator:
3. Parts Modified and Reidentified:
See Appendix A - Existing Accountability Table.
4. Parts Removed and Not Replaced:
None.
D. Parts Necessary to Change Spares
See the table in section 2.C.2. Parts and Materials Supplied by the Operator for the Hose Assembly
part numbers.
E. Special Tooling - Price and Availability
None.
QTY Boeing Part Number / Vendor Part Number Name
(a) 60B50059-601 / 38001-601 (b) Hose Assy
(a) 60B50059-602 / 38001-602 (b) Hose Assy
(a) 60B50059-603 / 38001-603 (b) Hose Assy
(a) 60B50059-604 / 38001-604 (b) Hose Assy
(a) 60B50059-605 / 38001-605 (b) Hose Assy
(a) 60B50059-606 / 38001-606 (b) Hose Assy
(a) 60B50059-607 / 38001-607 (b) Hose Assy
(a) 60B50059-608 / 38001-608 (b) Hose Assy
(a) 60B50059-609 / 38001-609 (b) Hose Assy
(a) 60B50059-610 / 38001-610 (b) Hose Assy
(a) 60B50059-612 / 38001-612 (b) Hose Assy
1 Roll 232U8002-16 (c) (d) (e) Protective Tape
(a) For Hose quantity requirements, see Illustrated Parts Catalog 35-11 for customer spe-
cific configuration.
(b) HydraFlow (V24984)
13529 East 166th Street
Cerritos, CA 90703-2203 (USA)
(c) Permacel P29 or Scotch 3M, No. 474 protective tape is 3/4 inches wide X 36 yards
long.
(d) Permacel Division, Johnson & Johnson (V99742)
U.S. Highway 101, P.O. Box 671
New Brunswick, NJ 08903 (USA)
(e) Minnesota Mining and Manufacturing Company (V26066)
3M Center
St. Paul, MN 55144-1000 (USA)

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BOEING SERVICE BULLETIN 747-35A2101
F. 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.

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BOEING SERVICE BULLETIN 747-35A2101
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BOEING SERVICE BULLETIN 747-35A2101
3. ACCOMPLISHMENT INSTRUCTIONS
A. GENERAL INFORMATION
Note:
1. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for
definition of the acronyms.
2. Obey all of the warnings and cautions given in the specified manual sections.
3. The instructions for this service bulletin are only for the replacement of the oxygen hoses
located at the captain, first officer, flight engineer, and the observers positions. The
replacement applies only to the positions with oxygen mask stowage boxes or panel
mounted regulators, and not the standard type passenger masks.
4. Due to the multiple configurations of the 747 Classic and the 747-400, the only Figure
that will be shown is the Oxygen Box Hose Typical Locations.
B. WORK INSTRUCTIONS
CAUTION: OXYGEN SYSTEM COMPONENTS REQUIRE SPECIAL CARE AND HANDLING
PROCEDURES. REVIEW THE SAFETY AND MAINTENANCE PROCESSES
SHOWN IN THE 747 CLASSIC AND THE 747-400 AMM 35-00-00, PRIOR TO
MAKING ANY CHANGES TO THE OXYGEN SYSTEM.
1. Remove the oxygen masks and oxygen stowage boxes or the panel mounted regulators, as
shown in the 747 Classic AMM 35-11-07 and 35-11-18 or the 747-400 AMM 35-00-00 and 35-
11-18, or operator's equivalent procedures.
2. Remove the existing low pressure, flex oxygen hoses as shown in the 747 Classic AMM 35-00-
00 or the 747-400 AMM 35-11-18, or operator's equivalent procedure.
Note:
1. Make sure 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.
2. Before dicarding the existing low pressure oxygen flex hose, record the part number.
See Appendix A - Existing Parts Accountability Table for applicable new low
pressure flex hose.
3. If the low pressure oxygen hoses have already been installed as shown in this
service bulletin, and application of the tape was not added, apply the tape to the
hose at the next available opportunity.
3. Apply protective tape to all of the crew low pressure, oxygen hoses as shown in Figure 2.
4. Install the applicable new, low pressure, flex oxygen hoses as shown in the 747 Classic AMM
35-00-00 or the 747-400 AMM 35-00-00 and 35-11-18, or operator's equivalent procedure.

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BOEING SERVICE BULLETIN 747-35A2101
Note: Make sure that there is a positive separation between the oxygen hoses, structure,
electrical wiring and equipment as shown in 747 Classic and 747-400 AMM 35-00-00 or
operators equivalent procedures.
5. Install the oxygen stowage boxes and oxygen masks or the panel mounted regulators, as
shown in the 747 Classic AMM 35-11-07 and 35-11-18 or the 747-400 AMM 35-11-18, or
operator's equivalent procedures.
6. Functional test the crew oxygen system as shown in the 747 Classic AMM 35-11-00, "Crew
Oxygen System Operational Test" and "System Leakage Test" or the 747-400 AMM 35-11-00,
"Crew Oxygen Operational Test" and "Crew Oxygen Leak Test," or operator's equivalent
procedure.
7. Put the airplane back to a serviceable condition.

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FIGURE 1: OXYGEN BOX HOSE TYPICAL LOCATIONS
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BOEING SERVICE BULLETIN 747-35A2101
FIGURE 1: OXYGEN BOX HOSE TYPICAL LOCATIONS
(TYPICAL CONFIGURATION)
HOSES AS APPLICABLE
REPLACE OXYGEN BOX
HOSES AS APPLICABLE
REPLACE OXYGEN BOX
(TYPICAL CONFIGURATION)
747-400 FLIGHT COMPARTMENT
747 FLIGHT COMPARTMENT
S96677
(SHEET 1 OF 1)

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FIGURE 2: TAPE APPLICATION
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BOEING SERVICE BULLETIN 747-35A2101
FIGURE 2: TAPE APPLICATION
The step numbers shown below agree with the numbers shown in the circle symbols in the figure.
STEP TASK NAME PART NUMBER QTY NOTES
1 Apply Protective Tape 232U8002-16 1
Roll
2 layers of Permacel P29 or
Scotch 3M (No. 474) protective
tape over entire length of hose.
60 DEGREES
1
V27438
OXYGEN HOSE
0.0625
OVERLAP
(SHEET 1 OF 1)

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APPENDIX A: EXISTING PARTS ACCOUNTABILITY TABLE
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BOEING SERVICE BULLETIN 747-35A2101
APPENDIX A: EXISTING PARTS ACCOUNTABILITY TABLE
Existing Part Number RUC Name QTY New Part Number PNC RC
60B50059-19 DIS Hose Assy (a) 60B50059-601 S A
60B50059-20 DIS Hose Assy (a) 60B50059-602 S A
60B50059-60 DIS Hose Assy (a) 60B50059-603 S A
60B50059-62 DIS Hose Assy (a) 60B50059-604 S A
60B50059-69 DIS Hose Assy (a) 60B50059-605 S A
60B50059-70 DIS Hose Assy (a) 60B50059-606 S A
60B50059-81 DIS Hose Assy (a) 60B50059-607 S A
60B50059-94 DIS Hose Assy (a) 60B50059-608 S A
60B50059-95 DIS Hose Assy (a) 60B50059-609 S A
60B50059-101 DIS Hose Assy (a) 60B50059-610 S A
60B50059-129 DIS Hose Assy (a) 60B50059-612 S A
(a) For Hose quantity requirements, see Illustrated Parts Catalog 35-11 for customer specific configu-
ration.
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.

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Table of Contents
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BOEING SERVICE BULLETIN 747-35A2101
Table of Contents
R e v i s i o n T r a n s m i t t a l S h e e t .........................................3
S u m m a r y .............................................5
1 . P L A N N I N G I N F O R M A T I O N ......................................9
A . E f f e c t i v i t y .............................................9
1 . A i r p l a n e s ..........................................9
2 . S p a r e s A f f e c t e d ...................................... 2 3
B . C o n c u r r e n t R e q u i r e m e n t s................................... 2 3
C . R e a s o n ............................................ 2 3
D . D e s c r i p t i o n ........................................... 2 3
E . C o m p l i a n c e ........................................... 2 4
F . A p p r o v a l............................................ 2 4
G . M a n p o w e r ........................................... 2 4
H . W e i g h t a n d B a l a n c e C h a n g e s................................. 2 5
I . E l e c t r i c a l L o a d D a t a...................................... 2 5
J . R e f e r e n c e s ........................................... 2 5
1 . E x i s t i n g D a t a : ....................................... 2 5
2 . D a t a s u p p l i e d w i t h t h i s S e r v i c e B u l l e t i n : ......................... 2 5
3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . 25
K . P u b l i c a t i o n s A f f e c t e d ...................................... 2 5
L . I n t e r c h a n g e a b i l i t y a n d I n t e r m i x a b i l i t y o f P a r t s......................... 2 5
2 . M A T E R I A L I N F O R M A T I O N ..................................... 2 7
A . M a t e r i a l - P r i c e a n d A v a i l a b i l i t y ................................. 2 7
B . I n d u s t r y S u p p o r t I n f o r m a t i o n .................................. 2 7
C . P a r t s N e c e s s a r y F o r E a c h A i r p l a n e.............................. 2 7
1 . K i t s / P a r t s : ......................................... 2 7
2 . P a r t s a n d M a t e r i a l s S u p p l i e d b y t h e O p e r a t o r :...................... 2 8
3 . P a r t s M o d i f i e d a n d R e i d e n t i f i e d : ............................. 2 8
4 . P a r t s R e m o v e d a n d N o t R e p l a c e d : ............................ 2 8
D . P a r t s N e c e s s a r y t o C h a n g e S p a r e s.............................. 2 8
E . S p e c i a l T o o l i n g - P r i c e a n d A v a i l a b i l i t y ............................. 2 8
F . S p e c i a l T o o l i n g N e c e s s a r y t o d o t h i s S e r v i c e B u l l e t i n..................... 2 9
3 . A C C O M P L I S H M E N T I N S T R U C T I O N S ............................... 3 1
A . G E N E R A L I N F O R M A T I O N ................................... 3 1
B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
F I G U R E 1 : O X Y G E N B O X H O S E T Y P I C A L L O C A T I O N S ..................... 3 3
F I G U R E 2 : T A P E A P P L I C A T I O N................................... 3 4
A P P E N D I X A : E X I S T I N G P A R T S A C C O U N T A B I L I T Y T A B L E ...................... 3 5

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Commercial
Airplane
Group 747
Service Bulletin
Number: 747-35A2101 Evaluation Form
Date: October 28, 1999
Revision 1: May 15, 2003
ATA System: 3510
CAS
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
y o ug i v eu st oi m p r o v et h eq u a l i t yo fo u rs e r v i c eb u l l e t i n s .
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) 4 3 2 1 (poor)
Please rate the quality of the illustrations: (good) 4 3 2 1 (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 Airplanes Group
P.O. Box 3707, Mail Code 2H-36
Seattle, WA 98124-2207 USA

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BOEING SERVICE BULLETIN 747-35A2101

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