Page 1 of 8 Aug 24/2011 SB 601R---71---033 

# SERVICE BULLETIN

Technical Publications

THIS SERVICE BULLETIN IS SENT TO EACH OPERATOR. IF THE OPERATOR HAS LEASED HAS SOLD AIRCRAFT OR TRANSFERRED SPARES IN THE LAST SIX MONTHS, THIS SERVICE BULLETIN MUST BE SENT TO THE NEW OWNER, UNLESS CONFIRMATION WAS RECEIVED THAT BOMBARDIER COMMERCIAL AIRCRAFT HAS INCLUDED THE NEW OPERATOR AIRCRAFT, THIS SERVICE BULLETIN MUST BE SENT TO THE LESSEE. IF THE OPERATOR

ON THE DISTRIBUTION LIST.

ATA SYSTEM: 71 ---10 NUMBER: 601R ---71 ---033 SUBJECT: Power Plant --- Cowling --- Installation of a Bracket for the Hold ---Open Rod to Prevent Fouling with the Fuel Control Unit

1. PLANNING INFORMATION A. Effectivity (1) Aircraft Affected: Service Bulletin: CL ---600---2B19 aircraft with serial numbers 7003 thru 7067, 7069 thru 7990 and 8000 thru 8112. Production: This change will be incorporated before delivery on aircraft with serial number 8113 and subsequent serial numbers. 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 bulletin, examine all STC, STA or e quivalent action changes to make sure you can complete this bulletin.

### SERVICE BULLETIN 601R---71 ---033

Page 2 of 8 Aug 24/2011 SB 601R---71---033 B. Reason (1) Condition It is possible for the hold ---open rod of the upper core---cowl on the left engine to become caught by the lever of the Fuel Control Unit (FCU) if it becomes unstowed or was incorrectly stowed. This can cause the FCU to operate incorrectly. (2) Evidence Many operators reported the incorrect operation of the FCU. (3) Objective/Benefit This service bulletin gives the procedure to do the Shorts service bulletin that gives the procedure to install a bracket on the inside of the left upper core---cowl. This will make sure that if the hold ---open rod becomes loose it will not touch the lever of the FCU. C. Description Circuit breakers are opened. The left upper core---cowl door is removed. The Shorts service bulletin is done. The left upper core---cowl door is installed and the circuit breakers are closed. The aircraft is returned to service. D. Compliance
Recommended Service Bulletin. Bombardier recommends that this service bulletin be done no more than 6000 flight hours or 36 months, whichever comes first, from the release date of 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.

### SERVICE BULLETIN 601R---71 ---033

Page 3 of 8 Aug 24/2011 SB 601R---71---033 F. Manpower The man-hours given below are estimates for direct labour 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 speci fied 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 labour assistance, please speak with a Fleet Services representative for a quote. The Fleet Services Team can be contacted through the CRC at 514-855-8500 or email at thd.crj@aero.bombardier.com. It will take an estimated 1.5 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 0.75 (2) Procedure NA (3) Test NA (4) Job Close-Out 0.75

NOTE: These estimates do not include the man-hours necessary to do Shorts service bulletin CF34---NAC ---71---056.

### SERVICE BULLETIN 601R---71 ---033

Page 4 of 8 Aug 24/2011 SB 601R---71---033 G. Material --- Price and Availability Refer to Shorts service bulletin CF34---NAC ---71---056. 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 Not changed. J. Electrical Load Data Not changed. K. References Restriction and/or Special Instruction (RSI) C ---A272, Revision A. Shorts Service Bulletin CF34---NAC ---71---056, dated July 18/2011. Aircraft Maintenance Manual For Bombardier reference only: PCA 6374. L. Other Publications Affected Illustrated Parts Catalogue (IPC) M. Relationship Chart Not applicable.

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Page 5 of 8 Aug 24/2011 SB 601R---71---033 2. ACCOMPLISHMENT INSTRUCTIONS
Reference Information
REFERENCE DESIGNATION AMM 24---00---00---910---801 Electrical/Electronic Safety Precautions AMM 71---12---01---000---801 Removal of the Upper Core---Cowl Door AMM 71---12---01---400---801 Installation of the Upper Core---Cowl Door A. Job Set-Up (1) Obey all the electrical/electronic safety precautions (Refer to AMM 24---00---00---910---801). For aircraft 7003 ---7067, 7069 ---7890 (2) Open, safety, and tag the circuit breakers that follow:
CB PANEL CB NO. NAME ZONE

CBP ---1 M2 ENG IGN A 221 CBP ---1 M3 ENG IGN B 221
For aircraft 7891 and subs (3) Open, safety, and tag the circuit breakers that follow:
CB PANEL CB NO. NAME ZONE

CBP ---1 M3 ENG IGN B 221 CBP ---4 C6 ENG IGN A 222
For all aircraft (4) Remove the left upper core---cowl door (Refer to AMM 71---12---01---000---801).

### SERVICE BULLETIN 601R---71 ---033

Page 6 of 8 Aug 24/2011 SB 601R---71---033 B. Procedure Refer to Figure 1 . (1) Do Shorts service bulletin CF34---NAC ---71---056. C. Job Close-Out (1) Install the left upper core---cowl door (Refer to AMM 71---12---01---400---801). For aircraft 7003 ---7067, 7069 ---7890 (2) Remove the tags and close the circuit breakers that follow:
CB PANEL CB NO. NAME ZONE

CBP ---1 M2 ENG IGN A 221 CBP ---1 M3 ENG IGN B 221
For aircraft 7891 and subs (3) Remove the tags and close the circuit breakers that follow:
CB PANEL CB NO. NAME ZONE

CBP ---1 M3 ENG IGN B 221 CBP ---4 C6 ENG IGN A 222
For all aircraft (4) When this service bulletin is completed, make this entry in the applicable logbooks: “Service Bulletin 601R---71---033, Power Plant --- Cowling --- Installation of a Bracket for the Hold ---Open Rod to Prevent Fouling with the Fuel Control Unit, incorporated.”

### SERVICE BULLETIN 601R---71 ---033

Page 7 of 8 Aug 24/2011 SB 601R---71---033 Upper Core ---Cowl Figure 1rsb601r71033_001.dg, sd, jul13/2011 UPPER CORE--COWL (REF)

### SERVICE BULLETIN 601R---71 ---033

Page 8 of 8 Aug 24/2011 SB 601R---71---033 3. MATERIAL INFORMATION
A. Kit Information None. B. Consumable Information For a list of special tools and equipment, refer to the different tasks and the Shorts service bulletin that are given as references in this service bulletin. C. Special Tools and Equipment There are no special tools and equipment for this service bulletin.
D. Disposition of Parts Not applicable. 1THANK YOU FOR ANSWERING THIS EVALUATION FORM UPON COMPLETION OF THIS EVALUATION FORM/COMPLIANCE SHEET, FAX TO 450-476-7300 

### SERVICE BULLETIN EVALUATI ON FORM/COMPLIANCE SHEET (YOUR IDEAS WILL HELP US PROVIDE BETTER BULLETINS)
SERVICE BULLETIN : 601R-71-033 ISSUE: NC

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