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 30/2011
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 670BA−24−031

S.B. 670BA−24−031

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May 30/2011
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 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 30/2011
2. 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 30/2011
B

A

LEGEND

1. ADG GCU

 604−90800−7 (Pre−Mod)

 604−90800−27 (Post−Mod).

1

ba6894a01.cgm

A

B

SERVICE BULLETIN 670BA−24−031

ADG GCU − Locator

Figure 1

S.B. 670BA−24−031

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May 30/2011
C. 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 30/2011
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 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 30/2011
THANK YOU FOR ANSWERING THIS EVALUATION FORM 

UPON COMPLETION OF THIS EVALUATION FORM/COMPLIANCE SHEET, FAX TO 

450-476-7300 

SERVICE BULLETIN EVALUATION 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:

    

• Illustration(s), figure(s), picture(s) and/or 

kit drawing(s) were helpful to carry out 

instructions. 

Comments:

    

• If a parts kit was required, did the kit 

contents received agree with the 

contents listed in the bulletin? 

Comments: 

    

• Aircraft hands-on work was 

accomplished in estimated time. 

 Comments:

    

• Overall, I was satisfied with this Service 

Bulletin. 

 Comments: 

    

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