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 e quivalent action changes to make sure you can complete this service bulletin.

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SB 601R---35---018 Page 2 of 14 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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SB 601R---35---018 Page 3 of 14 May 21/2013 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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SB 601R---35---018 Page 4 of 14 May 21/2013 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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SB 601R---35---018 Page 5 of 14 May 21/2013 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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SB 601R---35---018 Page 6 of 14 May 21/2013 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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SB 601R---35---018 Page 7 of 14 May 21/2013 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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SB 601R---35---018 Page 8 of 14 May 21/2013 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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SB 601R---35---018 Page 9 of 14 May 21/2013 (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 lbf S in. (7.91 to 13.56 N S m) (Refer to AMM 20---21---00---910---802). (r) Torque the 90 deg fitting to 70 to 120 lbf S in. (7.91 to 13.56 N S m) (Refer to AMM 20---21---00---910---802).

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SB 601R---35---018 Page 10 of 14 May 21/2013 Removal of the Flexible Hose Figure 1rsb601r35018_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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SB 601R---35---018 Page 11 of 14 May 21/2013 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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SB 601R---35---018 Page 12 of 14 May 21/2013 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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SB 601R---35---018 Page 13 of 14 May 21/2013 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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SB 601R---35---018 Page 14 of 14 May 21/2013 SPECIFICATION REFERENCE NAME QTY 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. 1THANK 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 EVALUATI ON 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: 

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 Illustration(s), figure(s), picture(s) and/or kit drawing(s) were helpful to carry out instructions. Comments: 

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 If a parts kit was required, did the kit contents received agree with the contents listed in the bulletin? Comments: 

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 Aircraft hands-on work was accomplished in estimated time. Comments: 

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 Overall, I was satisfied with this Service Bulletin. Comments: 

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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