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:

Aircraft Model Service Aircraft Serial Numbers Production Aircraft Serial Numbers CL−600−2C10 10003 thru 10319 10320 and subsequent serial numbers [1] CL−600−2D15 and CL−600−2D24 15001 thru 15260 15261 and subsequent serial numbers [1] CL−600−2E25 19001 thru 19012 19013 and subsequent serial numbers [1] [1] This change will be incorporated before delivery of aircraft. 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 equivalent action changes to make sure this bulletin can be completed. 

# SERVICE BULLETIN

ATA SYSTEM: 24−23 NUMBER: 670BA−24−031

S.B. 670BA−24−031 Page 1 of 8 May 30/2011 Technical Publications

THIS SERVICE BULLETIN IS SENT TO EACH OPERATOR. IF THE OPERATOR HAS LEASED AIRCRAFT, THIS SERVICE BULLETIN MUST BE SENT TO THE LESSEE. IF THE OPERATOR 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 DIVISION HAS INCLUDED THE NEW OPERATOR ON THE DISTRIBUTION LIST.

SUBJECT:B. Reason (1) Condition It is possible for the leads of the frequency and Point of Regulation (POR) voltage−sensing GCU internal−transformers to break. This can prevent the supply of power from the ADG to the AC busses. (2) Evidence The condition occurred on some in−service aircraft during maintenance test. (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. The frequency and POR voltage−sensing internal−transformers are replaced with the same type silicone−dipped transformers. The silicone−dipped transformers will strengthen the ADG design during thermal cycling and prevent breaks in the leads of the internal transformers. 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 10,000 flight hours 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. F. Manpower The man−hours given below are an estimate for direct labor done by an experienced crew on an aircraft prepared for maintenance. 

### SERVICE BULLETIN 670BA−24−031

S.B. 670BA−24−031 Page 2 of 8 May 30/2011This 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 670BA−24−031

S.B. 670BA−24−031 Page 3 of 8 May 30/2011G. 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 new 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. (1) 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 − Aircraft Maintenance Manual (AMM). − Modification Summary 670T040486, Revision A−1. − Restriction and/or Special Instruction (RSI), C−24

– 1264

– 00, Revision B. − Hamilton Sundstrand Service Bulletin ERPS10G−24

– 1, dated Feb 9/11. − For Bombardier reference only: PCA 74145. 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 670BA−24−031

S.B. 670BA−24−031 Page 4 of 8 May 30/20112. ACCOMPLISHMENT INSTRUCTIONS A. Job Set−Up (1) Reference Information
REFERENCE DESIGNATION AMM 12−00−00−867−801 Standard Aircraft Configuration for Maintenance AMM 24−00−00−910−801 Electrical/Electronic Safety Precautions AMM 24−23−01−720−801 Functional Test of the ADG AMM 24−23−01−720−802 Functional Test (on ground “ in flight mode ” or in flight) of the ADG AMM 24−23−05−000−801 Removal of the ADG Generator Control Unit AMM 24−23−05−400−801 Installation of the ADG Generator Control Unit AMM 24−23−05−720−801 Functional Test of the ADG Generator Control Unit (2) Make sure that the aircraft is in standard configuration for maintenance (AMM 12−00−00−867−801). (3) Obey all the electrical/electronic safety precautions (AMM 24−00−00−910−801). B. Procedure Refer to Figure 1. (1) Remove P/N 604

– 90800

– 7 ADG GCU (AMM 24−23−05−000−801). 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 (AMM 24−23−05−400−801). 

### SERVICE BULLETIN 670BA−24−031

S.B. 670BA−24−031 Page 5 of 8 May 30/2011B A

LEGEND 1. ADG GCU 604−90800−7 (Pre−Mod) 604−90800−27 (Post−Mod).

1ba6894a01.cgm A B 

### SERVICE BULLETIN 670BA−24−031

ADG GCU − Locator Figure 1

S.B. 670BA−24−031 Page 6 of 8 May 30/2011C. Job Close−Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) Do the functional test of the ADG GCU (AMM 24−23−05−720−801). (3) Do the functional test of the ADG or the functional test (on ground ” in flight mode ” or in flight) of the ADG (AMM 24−23−01−720−801 or AMM 24−23−01−720−802). (4) When this service bulletin is completed, make this entry in the applicable logbook(s): "Service Bulletin 670BA−24

– 031, Electrical Power − Air Driven Generator (ADG) − Installation of P/N 604−90800−27 ADG Generator Control Unit (GCU) ” , incorporated." 

### SERVICE BULLETIN 670BA−24−031

S.B. 670BA−24−031 Page 7 of 8 May 30/20113. 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 the 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 the part as shown in Hamilton Sundstrand Service Bulletin ERPS10G−24

– 1. 

### SERVICE BULLETIN 670BA−24−031

S.B. 670BA−24−031 Page 8 of 8 May 30/2011THANK 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 : 670BA-24-031 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