SB 601R---35---018

Page 1 of 14

May 21/2013

SERVICE BULLETIN

Technical

Publications

THIS SERVICE BULLETIN IS SENT TO EACH OPERATOR. IF THE OPERATOR HAS LEASED AIRCRAFT,

TRANSFERRED SPARES IN THE LAST SIX MONTHS, SEND THIS SERVICE BULLETIN TO THE NEW

OWNER, UNLESS CONFIRMATION WAS RECEIVED THAT BOMBARDIER COMMERCIAL AIRCRAFT

HAS INCLUDED THE NEW OPERATOR ON THE DISTRIBUTION LIST.

SEND THIS SERVICE BULLETIN TO THE LESSEE. IF THE OPERATOR HAS SOLD AIRCRAFT OR

ATA SYSTEM: 35 ---11 NUMBER: 601R ---35 ---018

SUBJECT: Oxygen --- Supply System --- Replacement of the Oxygen Discharge ---Hose

1. PLANNING INFORMATION

A. Effectivity

(1) Aircraft Affected:

Service: CL ---600---2B19 aircraft with serial numbers 7003 thru 7067,

7069 thru 7990, 8000 thru 8999.

Production: There is no production effectivity.

NOTE: The instructions 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 Service Bulletins. Before you do this service

bulletin, examine all STC, STA or equivalent action changes to make

sure you can complete this service bulletin.
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May 21/2013

B. Reason

(1) Condition

The burst pressure of the flexible hose used to vent oxygen from the

high---pressure relief---device of the oxygen cylinder overboard is lower than

the opening pressure of the high---pressure relief---device. This can cause the

flexible hose to burst before it could vent the excess oxygen overboard.

(2) Evidence

This was found during an analysis of the oxygen system by the

manufacturing ---engineering department.

(3) Objective/Benefit

This service bulletin give the procedure to replace the flexible hose of the

oxygen---discharge system by a new metallic flexible---hose. This will prevent

the flexible hose to burst if the high---pressure relief---device opens.

C. Description

The main avionics ---compartment door is opened. The oxygen supply is closed and

the oxygen pressure is bled.

The flexible hose of the oxygen---discharge system is removed and discarded. A

new metallic flexible hose and a bonding jumper are installed.

The oxygen supply is opened, and an operational test of the crew oxygen system is

done.

D. Compliance

Recommended Service Bulletin.

Bombardier recommends that this service bulletin be done at no more than 5800

flight hours or 44 months, whichever comes first, from the release date on this

service bulletin, unless otherwise directed by the airworthiness authority of the

operator.

This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage

Tolerance Inspections (DTIs).

E. Approval

The technical content of this service bulletin has been approved under the authority

of the TCCA Design Approval Organization No: DAO #93---Q ---02.
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F. Manpower

The man-hours given below are estimates for direct labor done by an experienced

crew on an aircraft prepared for maintenance.

These estimates do not include the time necessary for:

---Administrative functions such as planning, liaising, familiarization, and report writing.

---Non-productive elapsed time such as rest time, having meals, and crew shift

changes.

---Elapsed time such as for paint to dry, sealant to cure, and fuel tank venting.

---Preparation for modification (unless specified in the Accomplishment

Instructions) such as cleaning and getting parts, tools, consumables, and

ground equipment.

---Quality assurance inspections, troubleshooting and/or correction of

discrepancies found when a task is done.

---All other activities that are not considered by Bombardier as directly related to the

accomplishment of this procedure.

NOTE: For on-site labor assistance, please speak with a Fleet Services

representative for a quote. Contact the Fleet Services Team

through the CRC at 514-855-8500 or email at

thd.crj@aero.bombardier.com.

It will take an estimated 2.0 man-hours to complete this service bulletin. The

man-hours are divided in the table that follows (elapsed cure time is not included in

the man-hour summary given above):

TASK MAN-HOURS

(1) Job Set-Up 0.25

(2) Procedure 1.0

(3) Test 0.5

(4) Job Close-Out 0.25

G. Material --- Price and Availability

(1) The kits in the tables that follow are available from Bombardier Commercial

Aircraft.
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NOTE: For a list of kit contents, refer to paragraph 3.A.

KIT NUMBER NAME

601R35---018K1 Oxygen Hose Replacement

(2) Please send a purchase order to the address below to schedule kit delivery:

Bombardier

Service Bulletin Kit Support Team

123 Garratt Blvd, N42---24

Toronto, Ontario

Canada M3K 1Y5

Fax: 416-375-3060

Phone: 416-375-3920

Email: sbkits@aero.bombardier.com

Please contact the Service Bulletin Kit Support Team at the address above for

terms and conditions.

(3) Refer to paragraph 3.B. for a list of consumables for this service bulletin.

For Business/Corporate Operators

All Business/Corporate operators (i.e. operators who do not have a commercial

airline operation) refer to SB 800-00-004 for commercial policy coverage and

logistics/planning arrangements (refer to www.cic.bombardier.com/technical

library/service bulletins/challenger/850/SB 800-00-004).

To place an order for parts or kits, please call Bombardier Parts Logistics at

514-855-2999 or 1-866-538-1247.

H. Tooling --- Price and Availability

There are no tool kits for this service bulletin. Refer to paragraph 3.C. for a list of

special tools and equipment for this service bulletin.

I. Weight and Balance

WEIGHT ARM MOMENT ¡

+ 0.6 lb. + 202.5 in. + 0.122 ( 1000 lb-in.)

+ 0.27 kg + 5.14 m + 0.0014 (1000 kg-m)

¡ The value in the Moment column is divided by 1000.

Refer to Weight and Balance Manual CSP A ---041.
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J. Electrical Load Data

Not changed.

K. References

Restriction and/or Special Instruction (RSI) C ---A280, Revision B

Modification Summary TC601R18254, Revision D

Aircraft Maintenance Manual (AMM)

For Bombardier reference only: PCA 6494

Refer to the SB Introduction document for definition or explanation of Service

Bulletin content.

L. Other Publications Affected

Aircraft Maintenance Manual (AMM)

Aircraft Illustrated Parts Catalogue (AIPC)

M. Relationship Chart

PRE-SB

PART NUMBER NAME POST-SB

PART NUMBER NAME

38026---4---0280---000 Oxygen Hose

Assembly 601R44045---1 Hose Assembly
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2. ACCOMPLISHMENT INSTRUCTIONS

Reference Information

REFERENCE DESIGNATION

AMM 12---16---35---614---801 Crew Oxygen System --- Servicing

AMM 20---21---00---910---802 Torque Procedures for Plumbing Lines

AMM 20---22---01---910---801 Application of Thread Compounds and Tape to

Threaded Fittings on Plumbing Lines

AMM 35---00---00---910---001 Oxygen Safety Precautions

AMM 35---10---00---710---802 Operational Test of the Crew Oxygen System

AMM 51---80---00---400---803 Installation of Clamps and Electrical Bonding

Jumpers

AMM 51---80---00---100---802 Surface Preparation for Electrical Bonding

AMM 51---80---00---760---803 Electrical Bonding Test

SRM 51---23---00 Pressure, Environmental, Fuel Tank and Firewall

Sealing

Tolerance Information

Linear Tolerances Angular Tolerance

X.XX in. (X.X mm) X.X in. (X mm)

+/ ---0 ̊ 30” +/ --- 0.03 in. +/--- 0.1 in.

+/ --- 0.8 mm +/ --- 3 mm

NOTE: The tolerances above apply to the dimensions given in this service

bulletin, except when specified differently.
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A. Job Set-Up

(1) Open the main avionics ---compartment door.

WARNING: OBEY ALL THE OXYGEN SAFETY PRECAUTIONS WHEN YOU DO

WORK ON THE OXYGEN SYSTEM AND/OR AN OXYGEN SYSTEM

COMPONENT. IF YOU DO NOT DO THIS, YOU CAN CAUSE A FIRE OR

AN EXPLOSION.

(2) Obey all the oxygen safety precautions (Refer to AMM 35---00---00---910---001).

(3) Make sure that the pressure in the oxygen cylinder is not higher than the full

pressure for the given temperature (Refer to AMM 12---16---35---614---801).

(4) If the pressure is higher, decrease the pressure to the correct level as follows:

(a) Get access to a oxygen mask in the flight compartment.

(b) Push the PRESS TO TEST AND RESET control lever on the stowage

box, at the same time push the PRESS TO TEST flow control knob on

the mask regulator.

(c) Hold until the pressure in the oxygen bottle is to the correct level, and

release the control lever, and the flow control knob.

(d) Put the oxygen mask in the mask stowage box.

(5) Remove and discard the witness wire from the valve handle of the oxygen

cylinder.

(6) Fully close the valve handle of the oxygen cylinder.

(7) Bleed the oxygen pressure from the supply lines as follows:

(a) Get access to a oxygen mask in the flight compartment.

(b) Push the PRESS TO TEST AND RESET control lever on the stowage

box, at the same time push the PRESS TO TEST flow control knob on

the mask regulator.

(c) Hold until the oxygen flow stops, and release the control lever, and the

flow control knob.

(d) Put the oxygen mask in the mask stowage box.
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B. Procedure

Refer to Figure 1 .

(1) Remove and discard the flexible hose (1) as follows:

(a) Near stringer 23R, remove and discard the screw (2), the washer (3),

and the clamp (4) that hold the flexible hose (1) to the structure.

(b) Disconnect the flexible hose (1) from the oxygen cylinder and from the

oxygen---overpressure discharge---indicator.

(c) Discard the flexible hose (1).

Refer to Figure 2 .

(2) Install the new flexible hose (1) as follows:

(a) Apply compound MIL ---T ---5542 to the threads of the male fittings on the

oxygen cylinder and the oxygen---overpressure discharge---indicator

(Refer to AMM 20---22---01---910---801).

(b) Loosely connect the 45 deg. fitting to the oxygen cylinder.

NOTE: The fitting will be torqued after the clamps are installed.

(c) Loosely connect the 90 deg. fitting to the oxygen---overpressure

discharge---indicator.

NOTE: The fitting will be torqued after the clamps are installed.

(d) Put the clamp (4) on the flexible hose (1).

(e) Near stringer 23R, attach the clamp (4) to the structure with the screw

(12) and the washer (13).

(f) Put the clamp (11) on the bare metal area of the 45 deg. fitting of the

flexible hose (1) (Refer to AMM 51---80---00---400---803).

(g) Attach the bonding jumper (5) to the clamp (11) with the screw (6), the

washers (8), the washer (9), and the nut (7).

(h) On the post at BL20.0, prepare the surface around the attachment hole

for electrical bonding (Refer to AMM 51---80---00---100---802).
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(i) Attach the bonding jumper (5) to the post at BL20.0 with the screw (6)

the washers (8), the washer (9), and the nut (7).

(j) Do a check of the resistance of the ground connection

(Refer to AMM 51---80---00---760---803).

(k) Put the clamp (10) on the bonding jumper (5).

(l) Put the clamp (4) on the flexible hose (1).

(m) Attach the clamp (10) to the clamp (4) with the screw (6), the washers

(8), the washer (9), and the nut (7).

(n) Make sure there is a minimum clearance of 0.5 in. (12.7 mm) between

the bonding jumper (5) and the post at BL20.0.

(o) If the clearance is less than 0.5 in. (12.7 mm), change the location of the

clamps (10) and/or (4) to get the minimum clearance.

(p) With a brush, apply a layer of sealing compound on all sides of the

screws (6) and nuts (7) that attach the bonding jumper (5) to the post at

BL20.0 and the clamp (11) (Refer to SRM 51---23---00).

(q) Torque the 45 deg fitting to 70 to 120 lbfSin. (7.91 to 13.56 NSm)

(Refer to AMM 20---21---00---910---802).

(r) Torque the 90 deg fitting to 70 to 120 lbfSin. (7.91 to 13.56 NSm)

(Refer to AMM 20---21---00---910---802).
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Removal of the Flexible Hose

Figure 1

rsb601r35018_001.dg, cr, 05/12/12

A

3

2

4

B

LEGEND

1. Flexible hose

38026--4--0280--000 (Pre--mod).

2. Screw.

3. Washer.

4. Clamp.

A

FS319.70

FS333.00

STR23

STR20

OXYGEN--

OVERPRESSURE

DISCHARGE--

OXYGEN

CYLINDER

(REF)

PRE--MOD

B

INDICATOR (REF)

1
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Installation of the Flexible Hose

Figure 2

OXYGEN--OVERPRESSURE

DISCHARGE--INDICATOR

(REF)

STGR 23R

POST--MOD

FS319.00

FS333.00

OXYGEN

CYLILDER

(REF)

OXYGEN

CYLINDER

(REF)

rsb601r35018_002.dg, cr, 02--may--2013

8

7 9

5

10

6

8

8 8

6

9

7

8

6

11

1

4

9

7

13

12

4

8

45 DEG.

FITTING

(REF)

BL20.0

90 DEG.

FITTING

(REF)

LEGEND

1. Flexible hose

601R44045--1 (Post--mod).

4. Clamp MS21919WDG9.

5. Bonding jumper

MS25083--2BB8.

6. Screw MS35207--264.

7. Nut MS21042L3.

8. Washer NAS620A10L.

9. Washer MS35338--43.

10. Clamp MS21919WDG3.

11. Clamp AN735C4.

12. Screw NAS1801--3--8.

13. Washer AN960JD10L.

POST (REF)
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C. Job Close-Out

(1) Remove all tools, equipment, and unwanted materials from the work area.

(2) Fully open the valve handle of the oxygen cylinder.

(3) Safety the valve handle of the oxygen cylinder with the witness wire.

(4) Do an operational test of the crew oxygen system

(Refer to AMM 35---10---00---710---802).

(5) Close the main avionics-compartment door.

(6) When this service bulletin is completed, add the weight and balance data

shown in paragraph 1.I. of this service bulletin to the Weight and Balance

Manual. Under ‘Description of Change’ enter “ Service Bulletin

601R---35---018, incorporated.”

(7) When this service bulletin is completed, make this entry in the applicable

logbooks: “Service Bulletin 601R---35---018, Oxygen --- Supply System ---

Replacement of the Oxygen Discharge---Hose, incorporated.”
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3. MATERIAL INFORMATION

A. Kit Information

Kit Contents:

KIT 601R35 ---018K1 ¡

PART NUMBER QUANTITY NAME ALTERNATE

PARTS NOTES

601R44045---1 1 Hose assembly

AN735C4 1 Clamp

AN960JD10L 2 Washer

MS21042L3 3 Nut

MS21919WDG---3 1 Clamp

MS21919WDG---9 2 Clamp

MS25083---2BB8 1 Jumper assembly

MS35207---264 3 Screw

MS35338---43 4 Washer

NAS1801---3---8 1 Screw

NAS620A10L 9 Washer

¡ The kit can contain more hardware and/or material than necessary.

B. Consumable Information

The materials that follow are necessary to do this service bulletin. You can order

them from Bombardier or purchased directly from industry sources. If the material

is ordered from Bombardier, there can be some lead time because of the shelf life

of the material.

CONSUMABLES

SPECIFICATION QTY NAME REFERENCE

MIL ---T ---5542 As

necessary

Thread compound N/A
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SPECIFICATION REFERENCE QTY NAME

MIL ---PRF---81733

Type II

As

necessary

Compound, sealing

and coating,

corrosion inhibitive

09---009 ¡

MS20995CY20

QQ ---W---143

As

necessary

Lockwire (witness

wire), copper, 0.020

in. (0.51mm)

05---102¡

¡ Refer to AMM 51---31---00---990---801

NOTE: To complete this list of consumables, refer to the different tasks that are

given as references in this service bulletin

C. Special Tools and Equipment

For a list of special tools and equipment, refer to the different tasks that are given

as references in this service bulletin.

D. Disposition of Parts

The table that follows shows the disposition of parts on the aircraft (or spares), and

the relationship between these parts to the new parts to be installed through the

incorporation of this service bulletin.

PRE-SB

PART NUMBER

NAME QTY DC POST-SB

PART NUMBER

NAME

38026---4---0280---000

Oxygen

Hose

Assembly

1 DIS 601R44045---1 Hose

Assembly

Disposition code (DC):

DIS: Discard Part.

1
THANK YOU FOR ANSWERING THIS EVALUATION FORM 

UPON COMPLETION OF THIS EVALUATION FORM/COMPLIANCE SHEET, FAX TO 

450-476-7300 or email to CRJ_SB_Evaluation_Form@aero.bombardier.com

SERVICE BULLETIN EVALUATION FORM/COMPLIANCE SHEET 

(YOUR IDEAS WILL HELP US PROVIDE BETTER BULLETINS) 

SERVICE BULLETIN : ISSUE: 

 STRONGLY DISAGREE NEUTRAL AGREE STRONGLY 

 DISAGREE AGREE 

 Instructions to do the Service Bulletin 

were accurate. 

Comments:

    

 Illustration(s), figure(s), picture(s) and/or 

kit drawing(s) were helpful to carry out 

instructions. 

Comments:

    

 If a parts kit was required, did the kit 

contents received agree with the 

contents listed in the bulletin? 

Comments: 

    

 Aircraft hands-on work was 

accomplished in estimated time. 

 Comments:

    

 Overall, I was satisfied with this Service 

Bulletin. 

 Comments: 

    

PLEASE SUPPLY US WITH THE FOLLOWING DATA AND FAX TO (450) 476-7300: 

OPERATOR: NAME (Please print) 

SERVICE CENTER: TELEPHONE: 

AIRCRAFT SERIAL NO.: FACSIMILE: 

DATE OF SB 

INCORPOARTION