SB 601R---71---034 Page 1 of 1 Aug 1/2014 

## SERVICE BULLETIN REVISION TRANSMITTAL SHEET CL ---600 ---2B19 Canadair Regional Jet (CRJ) Aircraft SERVICE BULLETIN 601R ---71 ---034
SUBJECT: Power Plant --- Cowling --- Installation of Additional Attaching Hardware on the Engine Nose Access-Cowls This page transmits: Revision B of Service Bulletin 601R --- 71 --- 034, dated Aug 1/2014
The changes in this revision have no effect on aircraft that have had this service bulletin incorporated.

Reason: Revised Planning Information, paragraph 1., to: Extend the range of aircraft in the Aircraft Affected section. Add a note in the Compliance section. Revised Accomplishment Instructions, paragraph 2., to: Add steps and extend the effectivity range. This revision also includes small editorial changes that do not have an effect on the technical content.
Instructions: Discard the copy of Service Bulletin 601R --- 71 --- 034, Revision A dated Apr 28/2014. Replace with the copy attached. Keep Short Brothers Service Bulletin CF34---NAC ---71---042, Revision A, dated February 18, 2014. Service Bulletin History: Initial issue, dated Mar 31/2014 Revision A, dated Apr 28/2014 1SB 601R−71−034 Page 1 of 13 Mar 31/2014 Revision B, Aug 1/2014 

# 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 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: 71−10 NUMBER: 601R−71−034 SUBJECT: Power Plant − Cowling − Installation of Additional Attaching Hardware on the Engine Nose Access-Cowls

1. PLANNING INFORMATION A. Effectivity (1) Aircraft Affected: Service: CL−600−2B19 aircraft with serial numbers 7003 thru 7067, 7069 thru 7990, and 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 Supplemental Type Certificates (STCs), and Supplemental Type Approvals (STAs) or equivalent action changes to make sure you can complete this service bulletin.

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 2 of 13 Mar 31/2014 Revision B, Aug 1/2014 B. Reason (1) Condition If the camloc fasteners that attach the engine nose access-cowls are incorrectly fastened, the nose access−cowls can disengage during flight. (2) Evidence Some operators reported that nose access-cowls have disengaged during flight, caused by incorrectly fastened camloc fasteners. (3) Objective/Benefit This service bulletin gives the instruction to do Short Brothers Service Bulletin CF34−NAC−71−042, which gives the procedure to install additional fasteners on the nacelle access panels. The installation of additional fasteners will prevent the nose access-cowls to disengage during flight. C. Description PART A − Installation of Additional Attaching Hardware on the Left Nose Access-Cowls Circuit breakers are opened. Short Brothers Service Bulletin CF34−NAC−71−042, Part A, is done. The circuit breakers are closed. PART B − Installation of Additional Attaching Hardware on the Right Nose Access-Cowls Circuit breakers are opened. Short Brothers Service Bulletin CF34−NAC−71−042, Part B, is done. The circuit breakers are closed. D. Compliance
Recommended service bulletin. Bombardier recommends that this service bulletin be done at no more than 6000 flight hours from the release date on this service bulletin unless otherwise directed by the airworthiness authority of the operator. NOTE:If it is not possible to complete all the instructions in this service bulletin because of the configuration of the aircraft, speak with a representative of Bombardier Customer Response Centre at phone number 514−855−8500 or send an e−mail at thd.crj@bombardier.com for analysis and to get an approved disposition to complete this service bulletin. This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs).

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 3 of 13 Mar 31/2014 Revision B, Aug 1/2014 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. 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 e-mail at thd.crj@aero.bombardier.com.

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 4 of 13 Mar 31/2014 Revision B, Aug 1/2014 FOR PART A It will take an estimated 0.5 man-hours to complete PART A of this service bulletin. The man-hours are divided in the table that follows: TASK MAN-HOURS (1) Job Set-Up 0.25 (2) Procedure N/A (3) Test N/A (4) Job Close-Out 0.25

NOTE:These estimates do not include the man-hours necessary to do Short Brothers Service Bulletin CF34−NAC−71−042. FOR PART B It will take an estimated 0.5 man-hours to complete PART B of this service bulletin. The man-hours are divided in the table that follows: TASK MAN-HOURS (1) Job Set-Up 0.25 (2) Procedure N/A (3) Test N/A (4) Job Close-Out 0.25

NOTE:These estimates do not include the man-hours necessary to do Short Brothers Service Bulletin CF34−NAC−71−042.

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 5 of 13 Mar 31/2014 Revision B, Aug 1/2014 G. Material − Price and Availability Refer to Short Brothers Service Bulletin CF34−NAC−71−042. 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 Refer to paragraph 3.C and Short Brothers Service Bulletin CF34−NAC−71−042 for a list of special tools and equipment 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).

. I. Weight and Balance Refer to Short Brothers Service Bulletin CF34−NAC−71−042. J. Electrical Load Data Refer to Short Brothers Service Bulletin CF34−NAC−71−042. K. References Refer to the SB Introduction document for definition or explanation of service bulletin content. Restriction and/or Special Instruction (RSI) C−A285, Revision B Short Brothers Service Bulletin CF34−NAC−71−042, Revision A, dated February 18, 2014 Aircraft Maintenance Manual (AMM) For Bombardier reference only: PCA 6496 L. Other Publications Affected Aircraft Illustrated Parts Catalog (AIPC) M. Relationship Chart Refer to Short Brothers Service Bulletin CF34−NAC−71−042.

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 6 of 13 Mar 31/2014 Revision B, Aug 1/2014 2. ACCOMPLISHMENT INSTRUCTIONS
PART A − Installation of Additional Attaching Hardware on the Left Nose Access-Cowls A. Job Set-Up (1) Open, safety, and tag the circuit breakers that follow: For Aircraft 7003 thru 7067 and 7069 thru 7890 CB PANELCB NO. NAME ZONE

CBP−1 M2 ENG IGN A 221 CBP−1 M3 ENG IGN B 221 CBP−1 M5 ENG START L 221 CBP−3 B7 ENG IGN A 221 CBP−4 B5 THRUST REV AUTO STOW 1 222 CBP−4 B7 THRUST REV 1 222 CBP−5 B1 ENG IGN B 311
For Aircraft 7891 thru 7990 and 8000 thru 8999 CB PANELCB NO. NAME ZONE

CBP−1 M3 ENG IGN B 221 CBP−1 M5 ENG START L 221 CBP−3 B7 ENG IGN A 221 CBP−4 B5 THRUST REV AUTO STOW 1 222 CBP−4 B7 THRUST REV 1 222 CBP−4 C6 ENG IGN A 222 CBP−5 B1 ENG IGN B 311

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 7 of 13 Mar 31/2014 Revision B, Aug 1/2014 B. Procedure Refer to Figure 1. (1) Do Short Brothers Service Bulletin CF34−NAC−71−042, Part A. (2) If it is not possible to complete all the instructions in this service bulletin because of the configuration of the aircraft, speak with a representative of Bombardier Customer Response Centre at phone number 514−855−8500 or send an e−mail at thd.crj@bombardier.com for analysis and to get an approved disposition to complete this service bulletin. C. Job Close-Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) Remove the tags and close the circuit breakers that follow: For Aircraft 7003 thru 7067 and 7069 thru 7890 CB PANELCB NO. NAME ZONE

CBP−1 M2 ENG IGN A 221 CBP−1 M3 ENG IGN B 221 CBP−1 M5 ENG START L 221 CBP−3 B7 ENG IGN A 221 CBP−4 B5 THRUST REV AUTO STOW 1 222 CBP−4 B7 THRUST REV 1 222 CBP−5 B1 ENG IGN B 311

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 8 of 13 Mar 31/2014 Revision B, Aug 1/2014 For Aircraft 7891 thru 7990 and 8000 thru 8999 CB PANELCB NO. NAME ZONE

CBP−1 M3 ENG IGN B 221 CBP−1 M5 ENG START L 221 CBP−3 B7 ENG IGN A 221 CBP−4 B5 THRUST REV AUTO STOW 1 222 CBP−4 B7 THRUST REV 1 222 CBP−4 C6 ENG IGN A 222 CBP−5 B1 ENG IGN B 311
For all aircraft (3) When PART A of this service bulletin is completed, make this entry in theapplicable logbooks: Service Bulletin 601R−71−034, Revision B, Power Plant − Cowling − Installation of Additional Attaching Hardware on the Engine Nose Access-Cowls, PART A, incorporated."

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 9 of 13 Mar 31/2014 Revision B, Aug 1/2014 PART B − Installation of Additional Attaching Hardware on the Right Nose Access-Cowls D. Job Set-Up (1) Open, safety, and tag the circuit breakers that follow: For Aircraft 7003 thru 7067 and 7069 thru 7890 CB PANELCB NO. NAME ZONE

CBP−1 M2 ENG IGN A 221 CBP−1 M3 ENG IGN B 221 CBP−1 M4 ENG START R 221 CBP−3 B7 ENG IGN A 221 CBP−4 B6 THRUST REV AUTO STOW 2 222 CBP−4 B8 THRUST REV 2 222 CBP−5 B1 ENG IGN B 311
For Aircraft 7891 thru 7990 and 8000 thru 8999 CB PANELCB NO. NAME ZONE

CBP−1 M3 ENG IGN B 221 CBP−1 M4 ENG START R 221 CBP−3 B7 ENG IGN A 221 CBP−4 B6 THRUST REV AUTO STOW 2 222 CBP−4 B8 THRUST REV 2 222 CBP−4 C6 ENG IGN A 222 CBP−5 B1 ENG IGN B 311

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 10 of 13 Mar 31/2014 Revision B, Aug 1/2014 E. Procedure Refer to Figure 1. (1) Do Short Brothers Service Bulletin CF34−NAC−71−042, Part B. (2) If it is not possible to complete all the instructions in this service bulletin because of the configuration of the aircraft, speak with a representative of Bombardier Customer Response Centre at phone number 514−855−8500 or send an e−mail at thd.crj@bombardier.com for analysis and to get an approved disposition to complete this service bulletin. F. Job Close-Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) Remove the tags and close the circuit breakers that follow: For Aircraft 7003 thru 7067 and 7069 thru 7890 CB PANELCB NO. NAME ZONE

CBP−1 M2 ENG IGN A 221 CBP−1 M3 ENG IGN B 221 CBP−1 M4 ENG START R 221 CBP−3 B7 ENG IGN A 221 CBP−4 B6 THRUST REV AUTO STOW 2 222 CBP−4 B8 THRUST REV 2 222 CBP−5 B1 ENG IGN B 311

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 11 of 13 Mar 31/2014 Revision B, Aug 1/2014 For Aircraft 7891 thru 7990 and 8000 thru 8999 CB PANELCB NO. NAME ZONE

CBP−1 M3 ENG IGN B 221 CBP−1 M4 ENG START R 221 CBP−3 B7 ENG IGN A 221 CBP−4 B6 THRUST REV AUTO STOW 2 222 CBP−4 B8 THRUST REV 2 222 CBP−4 C6 ENG IGN A 222 CBP−5 B1 ENG IGN B 311
For all aircraft (3) When PART B of this service bulletin is completed, make this entry in theapplicable logbooks: Service Bulletin 601R−71−034, Revision B, Power Plant − Cowling − Installation of Additional Attaching Hardware on the Engine Nose Access-Cowls, PART B, incorporated."

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 12 of 13 Mar 31/2014 Revision B, Aug 1/2014 Component Locator Figure 1 (Sheet 1 of 1)rsb601r71034_001.dg, kp, December 13, 2013 UPPER NOSE ACCESS

−COWL (REF)

LOWER NOSE ACCESS

−COWL (REF)

LEFT SIDE SHOWN RIGHT SIDE OPPOSITE

### SERVICE BULLETIN 601R−71−034

SB 601R−71−034 Page 13 of 13 Mar 31/2014 Revision B, Aug 1/2014 3. MATERIAL INFORMATION
A. Kit Information Refer to Short Brothers Service Bulletin CF34−NAC−71−042. B. Consumable Information For a list of consumables, refer to the Short Brothers service bulletin that is given as a reference in this service bulletin. C. Special Tools and Equipment For a list of special tools and equipment, refer to the Short Brothers service bulletin that is given as a references in this service bulletin. D. Disposition of Parts Refer to Short Brothers Service Bulletin CF34−NAC−71−042. 1THANK YOU FOR YOUR COMMENTS



## SERVICE BULLETIN FEEDBACK FORM/COMPLIANCE SHEET (YOUR COMMENTS HELP US WRITE BETTER SERVICE BULLETINS)

Service Bulletin No.: Revision: Aircraft Serial Number: Date:
STRONGLY DISAGREEDISAGREEAGREESTRONGLY AGREE Instructions to do the service bulletin are accurate. Comments: 

## - - - -

Figure(s), picture(s), and/or Appendix were helpful to do the service bulletin. Comments: 

## - - - -

Part(s) or kit(s) agreed with the service bulletin requirement. Comments: 

## - - - -

The service bulletin was accomplished within the estimated time given. Comments: 

## - - - -

Overall, I was satisfied with this service bulletin. Comments: 

## - - - -

Operator: Service Centre: Name: Telephone or Fax: FAX your comments or feedback to (450) 476---7300 or e-mail tocrj_sb_evaluation_form@aero.bombardier.com