# Bombardier Service Bulletin 700-35-6503

Copy: No revision named ("SB 700-35-6503"), 16 pages: PDF https://openairdocs.org/files/sha256/51/86/5186428310eca48b82399fd81aa40c6e798c11db7f7ae10d8e90d5dff77b68e4; text https://openairdocs.org/service-documents/bombardier/sb-700-35-6503/file/5186428310ec.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2025-0908; AD 2025-16-07 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

## Details

- Manufacturer: [Bombardier](https://openairdocs.org/service-documents/bombardier.md)
- Type: Service bulletin (Service Bulletin)
- Number: 700-35-6503
- Page: https://openairdocs.org/service-documents/bombardier/sb-700-35-6503

## ADs that cite it (1) (OpenAirDocs)

Newest first, with the revision each names, as OpenAirDocs read it from the AD's text.

- [AD 2025-16-07](https://openairdocs.org/ad/2025-16-07.md), effective Sep 18, 2025: No revision named

Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/sb-700-35-6503/proposed.md).

## Text (16 pages)

Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2025-0908; AD 2025-16-07 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

SPECIAL CHECK/REWORK – THERAPEUTIC OXYGEN HOSE – INSPECTION FOR
MINIMUM CLEARANCE BETWEEN THE HARNESS AND OXYGEN HOSE
The information below is provided for your reference. For full details, including labor and part
coverage, please see corresponding paragraph contained within this bulletin.
RECOMMENDED
SPECIFIED TIME COMPLIANCE
COMPLIANCE TIME
Recommended before or at the next
120 months inspection
EFFECTIVITY: Refer to Paragraph 1.A.
MANPOWER: 10 man−hours
CONTINUED AIRWORTHINESS (CAW)
FLEET CAMPAIGN NOYES
TLMC, CH 5 AFFECTED NOYES
KITS and/or PARTS NOYES
TOOLING/GSE YES NO
PLANNING INFORMATION: See important
information at the start of Paragraph 1. YES NO
DEDICATED SCHEDULE NOYES
PREREQUISITE SERVICE BULLETINS: N/A
NOTE: This Service Bulletin may be subject to an Airworthiness Directive.
SERVICE BULLETIN SUMMARY
my.businessaircraft.bombardier.com
MODEL BD−700−1A10 (BD−700)
ATA 35−22
OXYGEN
Basic Issue: Jun 12/2024 700−35−6503
Page 1 of 1
This Service Bulletin is available at:

### Page 2

SPECIAL CHECK/REWORK – THERAPEUTIC OXYGEN HOSE – INSPECTION FOR
MINIMUM CLEARANCE BETWEEN THE HARNESS AND OXYGEN HOSE
1. PLANNING INFORMATION
NOTES:1 . Before you do this Service Bulletin, examine all STC, STA or
equivalent action changes to make sure that this Service Bulletin can
be completed.
2. To reduce operator downtime due to aircraft set−up, access, close−out
and return to service testing, Bombardier is recommending that the work is
done at the 120 month scheduled maintenance event.
A. Effectivity
BD−700−1A10 aircraft, Serial No. 9861, 9872, 60001, 60002, 60003, 60004,
60006, 60008, 60009, 60010, 60011, 60012, 60014, 60016, 60017, 60018, 60019,
60020, 60021, 60023, 60025, 60026, 60028, 60029, 60031, 60033, 60034, 60036,
60038, 60039, 60044, 60046, 60048, 60050, 60051, 60053, 60054, 60055, 60058,
60060, 60062, 60063, 60069, 60071, 60074, 60075, 60077, 60078 and 60079.
NOTE: The instructions given in this Service Bulletin are only applicable to the
systems and parts installed at the time of delivery of the aircraft or as
changed by Bombardier Aviation Service Bulletin(s).
B. Reason
1. Condition:
It was observed that on aircraft in−house at completions that the therapeutic
oxygen hose installations were non−compliant to the applicable installation
standards.
SERVICE BULLETIN
my.businessaircraft.bombardier.com
MODEL BD−700−1A10 (BD−700)
ATA 35−22
OXYGEN
Refer to applicable governmental agency regulations and requirements and make sure that the work described in this
Service Bulletin is performed in compliance with manufacturer’s recommendations and/or acceptable industry standards.
This document is proprietary to Bombardier Inc. and/or its affiliates and may not be reproduced or copied in any form or
by any means without the prior written consent of Bombardier Inc. and/or its affiliates.
 2024 Bombardier Inc.  All rights reserved
Learjet, Challenger, Global, are registered trademarks of Bombardier Inc. or its subsidiaries.
Basic Issue: Jun 12/2024 700−35−6503
Page 1 of 13
This Service Bulletin is available at:

### Page 3

2. Evidence:
− Minimum spacing between oxygen hose and the electrical harness was not
respected.
− Positive separation mechanisms have not been implemented.
− Appropriate protective barriers were not installed.
3. Objective/Benefit:
This Service Bulletin provides instructions to inspect the minimum clearance
between therapeutic oxygen hose and wire harness, and if required, instructs to
install appropriate hose and harness protective devices to make sure adequate
component protection and positive separation.
C. Description
This Service Bulletin gives instructions to:
Near FS 530 RHS,
− Inspect the clocking angle of therapeutic oxygen rigid line to hose elbow fitting,
− Inspect the therapeutic flexible oxygen hose for damage and protection,
− Replace the therapeutic flexible oxygen hose if hose is damaged,
− Install the split convolex shroud on the therapeutic flexible oxygen hose, if
required,
− Inspect the local harness for damage and repair the harness if required,
− Install the spiral wrap on local harness if required, and
− Do the necessary test to make sure that the system operates correctly if parts
were changed.
Near FS 650 RHS,
− Inspect the clocking angle of therapeutic oxygen rigid line to hose elbow fitting,
− Inspect the therapeutic flexible oxygen hose for damage and protection,
− Replace the therapeutic flexible oxygen hose if hose is damaged,
− Install the split convolex shroud on the therapeutic flexible oxygen hose, if
required,
− Inspect the local harness for damage and repair the harness if required,
− Install the spiral wrap on local harness if required, and
− Do the necessary test to make sure that the system operates correctly if parts
were changed.
MODEL BD−700−1A10 (BD−700)
Basic Issue: Jun 12/2024 700−35−6503
Page 2 of 13

### Page 4

D. Compliance
Recommended before or at the next 120 months inspection.
NOTE: If it is not possible to complete all the instructions in this Service Bulletin
because of the aircraft configuration, submit an SRPSA for analysis and to
get an approved disposition to complete this Service Bulletin. Standard
SRPSA fees may apply. Refer to the Services section of the Bombardier
customer portal for the latest prices, rates and fees.
E. Approval
This Service Bulletin does not contain modification information that revises the
approved configuration and therefore does not require governmental or other
regulatory approval.
F. Manpower
NOTES: 1. The man−hours given are to help you schedule the tasks given in this
Service Bulletin. The man−hours are for direct labor performed by an
experienced crew and do not include the time for familiarization,
planning, aircraft preparation in hangar such as towing and
positioning of scaffolds, removal of interior furnishings, repainting,
supervision and inspection.
For more information related to the manpower, refer to
SB 700−00−6502.
2. This Service Bulletin may require consumable materials that have
specific curing times (refer to Paragraph 3.C.). The accumulated
curing time is not included in the man−hours and should be
considered for planning purposes before you schedule this Service
Bulletin.
10 man−hours are necessary to do this Service Bulletin.
The labor required to do this Service Bulletin is at no cost if:
− the work is done during new aircraft warranty period, and
− the work is done at Bombardier Business Aviation Services (BBAS) or
Authorized Service Facilities (ASF), and
− the Service Bulletin is scheduled in less than 24 months from its release date
(Basic Issue).
G. Material − Cost and Availability
No kit or parts are necessary to do this special check/rework. For material data,
refer to Paragraph 3.C.
H. Tooling
The equipment and tool listed below is necessary to do this special check/rework:
MODEL BD−700−1A10 (BD−700)
Basic Issue: Jun 12/2024 700−35−6503
Page 3 of 13

### Page 5

GSE REFERENCE NO. PART NO. DESCRIPTION
Commercially Available − Spirap Tool
NOTES: 1. Refer to the Global 6500 Illustrated Tool and Equipment Manual
(ITEM) to make sure that you use the correct equipment
configuration.
2. Refer to the Liability Statement in the ITEM for the G6500, for
acceptable GSE equivalents.
3. This list is provided for quick reference. In case of discrepancy
between this list and the tools called in the SPM, WM, Chapter 20,
then the tools called in the SPM, WM prevail. Other approved
alternative tools are acceptable and can also be used.
I. Weight and Balance
No change.
J. Electrical Load Data
No change.
K. References
− Bombardier Aviation, Standard Practices Manual (SPM), Chapter 20.
− Global 6500 BD−700 Aircraft Maintenance Manual (AMM), Chapters 6, 24
and 35.
− Global 6500 BD−700 Supplemental Maintenance Manual (SMM), Chapter 25
and 35.
L. Other Publications Affected
None.
M. Equivalent Service Bulletins
− For Global Express and Global Express XRS BD 700−1A10 aircraft, use
SB 700−35−016.
− For Global 6000 BD 700−1A10 aircraft, use SB 700−35−6006.
MODEL BD−700−1A10 (BD−700)
Basic Issue: Jun 12/2024 700−35−6503
Page 4 of 13

### Page 6

2. ACCOMPLISHMENT INSTRUCTIONS
NOTES: 1. All TASKs given in the procedures that follow are from the Global 6500
BD−700−1A10 Aircraft Maintenance Manual (AMM) unless otherwise
specified.
2. All references made to zones, access panels and/or doors, are from the
Global 6500 BD−700−1A10 Aircraft Maintenance Manual (AMM),
Chapter 6.
A. Aircraft Setup
(1) Obey all electrical/electronic safety precautions. Refer to
AMM 24−00−00−910−801.
(2) Obey all oxygen system safety precautions. Refer to
AMM 35−00−00−910−801.
(3) Remove the dado panel. Refer to SMM 25−28−56−000−801.
(4) Remove the right aft divan forward end cabinet. Refer to
SMM 25−24−56−000−801.
NOTE: Aircraft configuration may vary. Refer to the SIPC and SMM for the
specific aircraft configuration and determine what needs to be
removed to have access to the therapeutic oxygen line.
B. Inspection/Rework
NOTE: If it is not possible to complete all the instructions in this Service Bulletin
because of the configuration of the aircraft, submit an SRPSA for analysis
and to get an approved disposition to complete this Service Bulletin.
Standard SRPSA fees may apply. Refer to the Services section of the
Bombardier customer portal for the latest prices, rates and fees.
NEAR FS 530 RHS
(1) Gain access to therapeutic flexible oxygen hose, Part No. 38911−5−0250.
Refer to Figure 1.
(2) Inspect the clocking angle of therapeutic oxygen rigid tube to oxygen hose
elbow fitting, if equipped, for minimum gap of 0.5 in (12.70 mm) with nearest
harness. If the gap is less than this minimum, adjust the elbow fitting to ensure
the maximum possible clearance is obtained with nearest harness. After
adjustment, the gap may still be less than the minimum 0.5 in (12.70 mm)
required and will be addressed in Step (7).
(3) Inspect the therapeutic flexible oxygen hose, Part No. 38911−5−0250, for
damage (crushing, fraying or permanent deformation) and protection.
(4) If oxygen hose, Part No. 38911−5−0250 is found damaged, replace as follows.
Refer to AMM Chapter 35 and SPM−MM 20−22−00−910−802.
(a) Remove the damaged oxygen hose.
(b) Install the new oxygen hose.
MODEL BD−700−1A10 (BD−700)
Basic Issue: Jun 12/2024 700−35−6503
Page 5 of 13

### Page 7

(5) If the oxygen hose is not protected by split convolex, Part
No. HCTE0437−0−SP or similar, or spiral wrap, Part No. TSW 1/4 or similar,
install split convolex shroud, Part No. HCTE0437−0−SP, on the oxygen hose.
Refer to SPM−WM 20−14−00−02 and Figure 3.
(6) Inspect the harnesses surrounding the oxygen hose for damage (damaged
wire sheathing, cut or nicked wires), if necessary repair the harness as per
SPM−WM 20−12−10−02 and refer to Figure 3.
(7) If the clearance between the wiring harness and the oxygen hose is less than
0.5 in (12.70 mm), install teflon cable wrap (05−124) or Nomex sleeving
(Roundit 2000NX), on wiring harness. Refer to SPM−WM 20−50−00−400−806
and Figure 3.
NEAR FS 650.00 RHS
(8) Gain access to therapeutic flexible oxygen hose, Part No. 38911−5−0250.
Refer to figure 2.
(9) Inspect the clocking angle of therapeutic oxygen rigid tube to oxygen hose
elbow fitting, if equipped, for minimum gap of 0.5 in (12.70 mm) with nearest
harness. If the gap is less than this minimum, adjust the elbow fitting to ensure
the maximum possible clearance is obtained with nearest harness. After
adjustment, the gap may still be less than the minimum 0.5 in (12.70 mm)
required and will be addressed in Step (14).
(10) Inspect the therapeutic flexible oxygen hose, Part No. 38911−5−0250, for
damage (crushing, fraying or permanent deformation) and protection.
(11) If oxygen hose, Part No. 38911−5−0250 is found damaged, replace as follows.
Refer to AMM Chapter 35 and SPM−MM 20−22−00−910−802.
(a) Remove the damaged oxygen hose.
(b) Install the new oxygen hose.
(12) If the oxygen hose is not protected by Split convolex, Part
No. HCTE0437−0−SP or similar, or spiral wrap, Part No. TSW 1/4 or similar,
install split convolex shroud, Part No. HCTE0437−0−SP, on the oxygen hose.
Refer to SPM−WM 20−14−00−02 and Figure 3.
(13) Inspect the harnesses surrounding the oxygen hose for damage (damaged
wire sheathing, cut or nicked wires), if necessary repair the harness as per
SPM−WM 20−12−10−02 and refer to Figure 3.
(14) If the clearance between the wiring harness and the oxygen hose is less than
0.5 in (12.70 mm), install the teflon cable wrap (05−124) or Nomex sleeving
(Roundit 2000NX), on wiring harness. Refer to SPM−WM 20−50−00−400−806
and Figure 3.
C. Testing
NOTE: RTS is required for any system (oxygen or electrical) which was impacted
by replace/repair.
(1) Do the leak test of the therapeutic oxygen system. Refer to
SMM 35−22−50−790−801.
MODEL BD−700−1A10 (BD−700)
Basic Issue: Jun 12/2024 700−35−6503
Page 6 of 13

### Page 8

(2) Do the operational test of the therapeutic oxygen system. Refer to
SMM 35−22−50−710−801.
D. Close−out
(1) Install the dado panel. Refer to SMM 25−28−56−400−801.
(2) Install the right aft divan forward end cabinet panel. Refer to
SMM 25−24−56−400−801.
(3) Remove all tools, equipment and unwanted materials from the aircraft.
E. Recording
When this Service Bulletin is completed, make an entry in the aircraft log and send
the attached Incorporation Notice to Bombardier Business Aircraft Customer
Services (BBACS).
For information, correction(s), comment(s) and/or feedback regarding Service
Bulletins released on the Customer Portal, please contact the Service Bulletin
Group at the following email address:
bbad_SBgroup@aero.bombardier.com
3. MATERIAL INFORMATION
A. Kit
No kits required.
B. Parts
No parts required.
C. Material
The material that follows, or equivalent, is necessary to do this Service Bulletin. It
can be purchased from a local supplier. Bombardier Aviation does not pay for this
consumable.
DESCRIPTION PART NO./NAME SPECIFICATION QUANTITY SUPPLIER(SEENOTE)
Cable Wrap,
Teflon 05−124 SPIRAP AsNecessary Code: A
Nomex
sleeving Roundit 2000NX − AsNecessary Code: A
MODEL BD−700−1A10 (BD−700)
Basic Issue: Jun 12/2024 700−35−6503
Page 7 of 13

### Page 9

DESCRIPTION PART NO./NAME SPECIFICATION QUANTITY SUPPLIER(SEENOTE)
Split convolex HCTE0437−0−SP − AsNecessary Code: A
NOTES: 1. Refer to the table that follows for each suppliers address listed by
codes.
2. The Curing Time (CT), if applicable, for each consumable material is
indicated with the description of each product.
3. At time of release of this Service Bulletin, the information on the
supplier was valid and accurate. In the event that this information has
changed, the operator is encouraged to use the World Wide Web to
find a local supplier.
SUPPLIERS ADDRESSES BY CODES
Code: A
Commercially available
D. Publications
No publications required.
MODEL BD−700−1A10 (BD−700)
Basic Issue: Jun 12/2024 700−35−6503
Page 8 of 13

### Page 10

Oxygen line, elbow angle not placed
to respect spacing requirements
Oxygen Hose
No protection added to wire bundle
MODEL BD−700−1A10 (BD−700)
Therapeutic Flexible Oxygen Hose at FS 530 RHS
Figure 1
Basic Issue: Jun 12/2024 700−35−6503
Page 9 of 13

### Page 11

View looking up, hard fouling condition of oxygen flex hose swivel nut
and exposure to sharp edges of threads on elbow fitting
View looking up, hard fouling condition of
oxygen flex hose swivel nut and
exposure to sharp edges of threads on
elbow fitting
MODEL BD−700−1A10 (BD−700)
Therapeutic Flexible Oxygen Hose at FS 650 RHS
Figure 2
Basic Issue: Jun 12/2024 700−35−6503
Page 10 of 13

### Page 12 (OCR)

Global 6500
MODEL BD-700-1A10 (BD-700)
VETOG
Example of Good Installation
Figure 3 (Sheet 1 of 3)
Basic Issue: Jun 12/2024  700-35-6503
Page 11 of 13

### Page 13 (OCR)

Global 6500
MODEL BD-700-1A10 (BD-700)
Example of Good Installation
Figure 3 (Sheet 2 of 3)
Basic Issue: Jun 12/2024  700-35-6503
Page 12 of 13

### Page 14 (OCR)

Global 6500
MODEL BD-700-1A10 (BD-700)
Example of Good Installation
Figure 3 (Sheet 3 of 3)
Basic Issue: Jun 12/2024  700-35-6503
Page 13 of 13

### Page 15

700−35−6503 Basic Jun 12/2024
SPECIAL CHECK/REWORK – THERAPEUTIC OXYGEN HOSE –
INSPECTION FOR MINIMUM
CLEARANCE BETWEEN THE HARNESS AND OXYGEN HOSE
bbad_SBgroup@aero.bombardier.com
NOTE: Please use Salesforce only for troubleshooting issues or when Engineering
deviation is necessary to accomplish the Service Bulletin modification.
SERVICE BULLETIN EVALUATION FORM
(Your ideas will help us provide better bulletins)
SERVICE BULLETIN: ISSUE: DATED:
TITLE:
For any information, correction(s), comment(s) and/or feedback regarding Service
Bulletins released on the Customer Portal, please contact the Service Bulletin Group
at the following email address:

### Page 16

SERVICE BULLETIN INCORPORATION SHEET − "700−35−6503"
Upon completion of the Service Bulletin, please fill−in, fax to
(514) 855−8798 or e−mail to Fracas at fracas.montreal@aero.bombardier.com
If you’re reporting Service Bulletin (SB) Incorporations to CAMP, sending
this Incorporation Sheet to Bombardier is not mandatory. If your aircraft is
on another tracking system, please contact Bombardier to make arrangements
for automated data submission.
700−35−6503 Basic
COMPLIED WITH
YES    NO    N/A
Actual hours to accomplish Service Bulletin:
* NOTES:
Aircraft Serial No. Aircraft Reg. No.
Airframe Hours: Airframe Landings
S.B. Incorporation Date Service Order No.
Facility incorporating S.B.
Name Signature Date
BOMBARDIER
SUBMISSION
Service Bulletin
Number
Rev. * Parts
Completed
Remarks/Reason
(Mandatory if N/A)
1. Where the Service Bulletin is divided into a number of parts (e.g., PARTS A,
B, C, D, etc.) which can be carried out separately, indicate only those parts
completed at this time.
2. For repetitive checks (usually PART A) only the initial check should be
reported unless otherwise stated in the Service Bulletin.
3. When more than one part is carried out at the same time, each part should
be reported.
4. Fill in ’Remark/Reason’ to explain compliance method when N/A is selected.(E.g. Part
not installed, N/A by effectivity, N/A by Part Serial Number, etc.
5. PCW means ’Previously Complied With’.
(dd/mm/yy)
Signature not required if sent by E−Mail (dd/mm/yy)

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