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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 equivalent action changes to make

sure this bulletin can be completed.
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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.
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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.
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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
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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.”
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Dry ADG GCU --- Removal/Installation

Figure 1

rsb601r24130_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
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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.

1
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: 601R-24-130 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