SB 601R---24---130 Page 1 of 7 Apr 27/2011 

# 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: 24 ---23 NUMBER: 601R ---24 ---130 SUBJECT: Electrical Power --- Air Driven Generator (ADG) --- Installation of P/N 604 ---90800 ---27 ADG Generator Control Unit (GCU)

1. PLANNING INFORMATION A. Effectivity (1) Aircraft Affected: Service Bulletin: CL ---600---2B19 Canadair Regional Jet (CRJ) Aircraft Serial Numbers 7305 thru 7990 and 8000 thru 8109. Production: This change will be incorporated before delivery on Aircraft Serial Numbers 8110 and subsequent. 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 Bulletin(s). Before you do this bulletin, examine all STC, STA or e quivalent action changes to make sure this bulletin can be completed.

### SERVICE BULLETIN 601R---24 ---130

SB 601R---24---130 Page 2 of 7 Apr 27/2011 B. Reason (1) Condition The threshold of the ADG GCU sensing circuit, which is used to identify over-current protection, is too low. This can prevent the supply of power from the ADG to the AC busses during under-voltage and over-current conditions. (2) Evidence This condition occurred during production flight testing and on some in-service aircraft. (3) Objective/Benefit This service bulletin gives the instructions to change P/N 604---90800---7 ADG GCU into P/N 604---90800---27. Modification of the ADG GCU is done with the incorporation of Hamilton Sundstrand Service Bulletin ERPS10G---24---1. P/N 604---90800---27 ADG GCU has a lower under-voltage and a higher fault detection threshold. C. Description P/N 604---90800---7 ADG GCU is removed. P/N 604---90800---27 ADG GCU is installed. The functional test of the dry ADG is done. D. Compliance Recommended Service Bulletin. Bombardier recommends that this service bulletin be done within 24 months 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.

### SERVICE BULLETIN 601R---24 ---130

SB 601R---24---130 Page 3 of 7 Apr 27/2011 F. Manpower The man-hours given below are an estimate for direct labor done by an experienced crew on an aircraft prepared for maintenance. This estimate does not include the time necessary for:

− Administrative functions such as planning, liaison, 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. The Fleet Services Team can be contacted via the CRC at 514 --- 855 --- 8500 or email at thd.crj@aero.bombardier.com. It will take an estimated 1.25 man---hours to complete this service bulletin. The man-hours are divided as shown in the table that follows: TASK MAN ---HOURS (1) Job Set ---Up 0.25 (2) Procedure 0.50 (3) Test 0.25 (4) Job Close---Out 0.25

NOTE: This estimate does not include the man-hours necessary to do Hamilton Sundstrand Service Bulletin ERPS10G---24---1.

### SERVICE BULLETIN 601R---24 ---130

SB 601R---24---130 Page 4 of 7 Apr 27/2011 G. Material --- Price and Availability There are no kits for this service bulletin. (1) Refer to Hamilton Sundstrand Service Bulletin ERPS10G---24---1 for terms and conditions to do the modification of the P/N 604---90800 ---7 ADG GCU to the P/N 604---90800---27 ADG GCU. (2) Refer to paragraph 3.B. for a list of consumables for this service bulletin. H. Tooling --- Price and Availability There are no tool kits for this service bulletin. I. Weight and Balance Not changed. J. Electrical Load Data Not changed. K. References Aircraft Maintenance Manual. Modification Summary TC601R18002, Revision C. Restriction and/or Special Instruction (RSI) C ---A267, Revision A. Hamilton Sundstrand Service Bulletin ERPS10G---24---1, dated Feb 9/11. For Bombardier reference only: PCA 6344 and 6351. L. Other Publications Affected Aircraft Illustrated Parts Catalog (AIPC) M. Relationship Chart

PRE ---SB PART NUMBER NAME POST ---SB PART NUMBER NAME
604---90800---7 ADG GCU 604---90800---27 ADG GCU

### SERVICE BULLETIN 601R---24 ---130

SB 601R---24---130 Page 5 of 7 Apr 27/2011 2. ACCOMPLISHMENT INSTRUCTIONS A. Job Set ---Up Reference Information
REFERENCE DESIGNATION AMM 24---00---00---910---801 Electrical/Electronic Safety Precautions AMM 24---23---01---720---803 Functional Test of the Dry ADG AMM 24---23---07---020---801 Removal of the Dry ADG Generator Control Unit AMM 24---23---07---420---801 Installation of the Dry ADG Generator Control Unit WARNING: OBEY ALL THE SAFETY PRECAUTIONS WHEN YOU DO MAINTENANCE ON OR NEAR ELECTRICAL/ELECTRONIC EQUIPMENT. IF YOU DO NOT OBEY THE SAFETY PRECAUTIONS, INJURIES TO PERSONS AND/OR DAMAGE TO THE EQUIPMENT CAN OCCUR. (1) Obey all the electrical/electronic safety precautions (Refer to AMM 24---00---00---910---801). B. Procedure Refer to Figure 1. (1) Remove P/N 604---90800---7 ADG GCU (Refer to AMM 24---23---07---020---801). NOTE: Refer to Hamilton Sundstrand Service Bulletin ERPS10G---24---1 for modification of P/N 604---90800---7 into P/N 604---90800---27. (2) Install P/N 604---90800---27 ADG GCU (Refer to AMM 24---23---07---420---801). C. Job Close ---Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) Do the functional test of the dry ADG (Refer to AMM 24---23---01---720---803). (3) Close the main avionics ---compartment door. (4) When this service bulletin is completed, make this entry in the applicable logbook(s): “Service Bulletin 601R---24---130, Electrical Power --- Air Driven Generator (ADG) --- Installation of P/N 604---90800---27 ADG Generator Control Unit (GCU), incorporated.”

### SERVICE BULLETIN 601R---24 ---130

SB 601R---24---130 Page 6 of 7 Apr 27/2011 Dry ADG GCU --- Removal/Installation Figure 1rsb601r24130_001.cgm, sc, 14Jan 11 RESET 1. ADG generator control unit 604--90800--7 (Pre--Mod) 604--90800--27 (Post--Mod). LEGEND

1 A

B

A B

### SERVICE BULLETIN 601R---24 ---130

SB 601R---24---130 Page 7 of 7 Apr 27/2011 3. MATERIAL INFORMATION
A. Kit Information None. B. Consumable Information For a list of consumables, refer to the different tasks and the Hamilton Sundstrand service bulletin 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 and the Hamilton Sundstrand service bulletin given as references in this service bulletin. D. Disposition of Parts The table that follows shows the disposition of installed parts on the aircraft (or spares), and the relation of installed parts (or spares) to the new parts to be installed with this service bulletin.
PRE ---SB PART NUMBER NAME QUANTITY DC POST ---SB PART NUMBER NAME

604---90800---7 ADG GCU 1 RWI 604---90800---27 ADG GCU Disposition code (DC): RWI: Rework part as shown in Hamilton Sundstrand Service Bulletin ERPS10G---24---1. 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-24-130 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