Landing Gear − Brake System − Replacement of Accumulator P/N 0860204001

by P/N 90006691

These pages transmit:

Revision A of Service Bulletin 670BA−32−028,

pages 1 thru 17, dated Feb 03/2011.

The changes in this revision have no effect on aircraft that have incorporated a

previous issue of this service bulletin.

Reason:

Revised Planning Information, paragraph 1., to:

Add CL−600−2B19 model in Evidence, paragraph 1. (2).

Change the address in Material − Price and Availability, paragraph 1.G.(2).

Add Meggitt Aircraft Braking Systems Service Information Letter in

References, paragraph 1.K.

Revised Accomplishment Instructions, paragraph 2., to:

Change part number 086024001 for 0860204001 in figure 1.

This revision also includes small editorial changes that do not have an effect on the

technical content.

Document Instructions:

Discard the copy of Service Bulletin 670BA−32−028, dated Dec 22/2010. Replace with the

copy attached.

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 1 of 2

Feb 03/2011

SERVICE BULLETIN

REVISION TRANSMITTAL SHEET

CL−600−2C10, CL−600−2D15, CL−600−2D24 and CL−600−2E25

CANADAIR REGIONAL JET (CRJ) AIRCRAFT

SUBJECT:
Service Bulletin History:

Initial issue, dated Dec 22/2010.

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 2 of 2

Feb 03/2011
Landing Gear − Brake System − Replacement of Accumulator P/N 0860204001

by P/N 90006691

1. PLANNING INFORMATION

A. Effectivity

(1) Aircraft Affected:

Service Bulletin: CL−600−2C10 Canadair Regional Jet (CRJ)

Aircraft Serial Numbers 10003 thru 10314.

Production: This change will be incorporated before delivery on

Aircraft Serial Numbers 10315 and subsequent.

Service Bulletin: CL−600−2D15 Canadair Regional Jet (CRJ) and

CL−600−2D24 Canadair Regional Jet (CRJ)

Aircraft Serial Numbers 15001 thru 15259.

NOTE: This service bulletin was incorporated before delivery in aircraft

serial numbers 15233, 15234, and 15239.

Production: This change will be incorporated before delivery on

Aircraft Serial Numbers 15260 and subsequent.

SERVICE BULLETIN

ATA SYSTEM: 32−43 NUMBER: 670BA−32−028

S.B. 670BA−32−028

Page 1 of 17

Dec 22/2010

Revision A, Feb 03/2011

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:
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.

B. Reason

(1) Condition

It is possible for the accumulator screw caps of the inboard and outboard

brake accumulators to disconnect and cause damage to the aircraft structure

and systems.

(2) Evidence

Seven CL−600−2B19 in−service aircraft had one screw cap disconnected

from the body of the accumulator.

(3) Objective/Benefit

This service bulletin gives the procedure to replace the accumulators of the

inboard and outboard brakes.

The replacement of accumulator P/N 0860204001 by P/N 90006691 will

prevent the disconnection of the screw caps from the body of the

accumulator.

C. Description

This service bulletin is divided into two parts: PART A and PART B.

PART A − Installation of the new inboard brake accumulator

The hydraulic pressure is released from hydraulic system No. 3. Circuit breakers

are opened. The electrical power is removed from the aircraft. The main

avionic−compartment and the electrical bay doors are opened. The hydraulic

access door is removed.

The inboard brake accumulator is removed. A new inboard brake accumulator is

installed.

The circuit breakers are closed. The servicing of the inboard brake accumulator

and the hydraulic system No. 3 reservoir is done. The inboard brakes and

hydraulic system No. 3 are bled. An operational check of the inboard brake

accumulator is done. The hydraulic access door is installed. The electrical bay

and the main avionic−compartment doors are closed.

PART B − Installation of the new outboard brake accumulator

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 2 of 17

Dec 22/2010

Revision A, Feb 03/2011
The hydraulic pressure is released from hydraulic system No. 2. Circuit breakers

are opened. The electrical power is removed from the aircraft. The main

avionic−compartment and the electrical bay doors are opened.

The outboard brake accumulator is removed. A new outboard brake accumulator

is installed.

The circuit breakers are closed. The servicing of the outboard brake accumulator

and the hydraulic system No. 2 reservoir is done. The outboard brakes and

hydraulic system No. 2 are bled. An operational check of the outboard brake

accumulator is done. The hydraulic access door is installed. The electrical bay

and the main avionic−compartment doors are closed.

D. Compliance

Recommended Service Bulletin.

Bombardier recommends that this service bulletin be done no more than 4000

flight cycles from the release date on this service bulletin or no later than 2 years

from the release date on this service bulletin, whichever comes first, unless

otherwise directed by the airworthiness authority of the operator.

NOTE: It is not necessary to do Service Bulletin 670BA−32−021, Landing Gear

− Brake System − Inspection of the Accumulator Screw−Caps (P/N

0860204001), when this service bulletin is done.

NOTE: It is not necessary to do Service Bulletin 670BA−32−026, Landing Gear

− Brake System − Detailed Inspection of the Accumulator Screw−Caps

Threads, when this service bulletin is done.

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, 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.

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 3 of 17

Dec 22/2010

Revision A, Feb 03/2011
− 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.

PART A − Installation of the new inboard brake accumulator

It will take an estimated 3.5 man−hours to complete PART A of this service

bulletin. The man−hours are divided as shown in the table that follows:

TASK MAN−HOURS

(1) Job Set−Up 1.0

(2) Procedure 1.0

(3) Test 1.0

(4) Job Close−Out 0.5

PART B − Installation of the new outboard brake accumulator

It will take an estimated 3.5 man−hours to complete PART B of this service

bulletin. The man−hours are divided as shown in the table that follows:

TASK MAN−HOURS

(1) Job Set−Up 1.0

(2) Procedure 1.0

(3) Test 1.0

(4) Job Close−Out 0.5

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 4 of 17

Dec 22/2010

Revision A, Feb 03/2011
G. Material − Price and Availability

(1) There are no kits for this service bulletin. The part in the table that follows is

necessary to do this service bulletin. Refer to the paragraph below for terms

and conditions.

PART NUMBER NAME QUANTITY

90006691 Accumulator 1[1]

[1] One accumulator is necessary to do each PART of this service bulletin.

(2) Please send a purchase order to the address below to schedule the part(s):

Meggitt Aircraft Braking Systems (MABS)

Attn: Mr Tom Borgmann, Warranty Administrator

1204 Massillon Road

Akron, Ohio 44306−4186

USA

Fax: 330−796−3420

Phone: 330−796−7200

email: tom.borgmann@meggit.com

Please contact MABS at the address above for terms and conditions.

(3) 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

PART A − Installation of the new inboard brake accumulator

WEIGHT ARM MOMENT [1]

0.8 (lb) 185.2 (in.) 0.15 (1000 lb·in)

0.36 (kg) 4.7 (m) 0.0017 (1000 kg·m)

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 5 of 17

Dec 22/2010

Revision A, Feb 03/2011
WEIGHT ARM MOMENT [1]

[1] The value in the Moment column is divided by 1000. Refer to the Weight &

Balance Manual CSP B−041 or CSP C−041.

PART B − Installation of the new outboard brake accumulator

WEIGHT ARM MOMENT [1]

0.8 (lb) 185.2 (in.) 0.15 (1000 lb·in)

0.36 (kg) 4.7 (m) 0.0017 (1000 kg·m)

[1] The value in the Moment column is divided by 1000. Refer to the Weight &

Balance Manual CSP B−041 or CSP C−041.

J. Electrical Load Data

Not changed.

K. References

− Restriction and/or Special Instruction (RSI), C−32−1210−00.

− Modification Summary 670T095002, Revision A−2.

− Bombardier Regional Jet Series All Operator Message (AOM), No. 614.

− Meggitt Aircraft Braking Systems Service Information Letter

90006691–SL−01.

− Aircraft Maintenance Manual (AMM), CSP B−001.

− For Bombardier reference only: PCA 73565, 74256, and DCP

AB670−23002.

L. Other Publications Affected

− Aircraft Illustrated Parts Catalog (IPC), CSP B−006.

− Aircraft Illustrated Parts Catalog (IPC), CSP C−006.

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 6 of 17

Dec 22/2010

Revision A, Feb 03/2011
M. Relationship Chart

PRE−SB

PART

NUMBER

NAME POST−SB PART

NUMBER NAME

0860204001 Accumulator 90006691 Accumulator

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 7 of 17

Dec 22/2010

Revision A, Feb 03/2011
2. ACCOMPLISHMENT INSTRUCTIONS

PART A − Installation of the new inboard brake accumulator

A. Job Set−Up

(1) Reference Information

REFERENCE DESIGNATION

AMM 12−00−00−867−801 Standard Aircraft Configuration for

Maintenance

AMM 12−00−06−862−804 Release Hydraulic Pressure of

System No. 3

AMM 12−12−29−611−802 Servicing of the Hydraulic System

No. 3 Reservoir

AMM 12−12−29−614−801 Servicing of the Hydraulic System

Accumulators

AMM 24−00−00−861−802 Remove Electrical Power from the

Aircraft

AMM 24−00−00−910−801 Electrical/Electronic Safety

Precautions

AMM 29−00−00−910−802 Hydraulic Technical Precautions

AMM 29−10−00−870−802 Bleed Hydraulic System No. 3

AMM 32−43−00−870−801 Bleeding of the Brakes

AMM 32−43−16−000−801 Removal of the Brake Accumulator

AMM 32−43−16−400−801 Installation of the Brake

Accumulator

AMM 32−43−16−710−801 Operational Test of the Brake

Accumulator

(2) Make sure that the aircraft is in standard configuration for maintenance

(AMM 12−00−00−867−801).

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 8 of 17

Dec 22/2010

Revision A, Feb 03/2011
(3) Obey all the hydraulic technical precautions (AMM 29−00−00−910−802).

WARNING: OBEY ALL HYDRAULIC SAFETY PRECAUTIONS WHEN YOU

DO WORK ON THE HYDRAULIC SYSTEM AND HYDRAULIC

SYSTEM COMPONENTS. YOU CAN CAUSE INJURY TO

PERSONS AND DAMAGE TO EQUIPMENT.

(4) Release the hydraulic pressure from hydraulic system No. 3 (AMM

12−00−06−862−804).

(5) Operate the brake pedals of the pilot or co−pilot to release the hydraulic

pressure from the brake accumulators (approximately six times).

WARNING: OBEY ALL THE SAFETY PRECAUTIONS WHEN YOU DO

MAINTENANCE ON OR NEAR ELECTRICAL/ELECTRONIC

EQUIPMENT. YOU CAN CAUSE INJURY TO PERSONS AND/OR

DAMAGE TO EQUIPMENT.

(6) Obey all the electrical/electronic safety precautions (AMM

24−00−00−910−801).

(7) Open, safety, and tag the circuit breakers that follow:

CB−PANEL CB NO. NAME

CBP−1 F11 HYD SYST AC PUMP CONT 3B

CBP−2 F14 HYD SYST AC PUMP CONT 3A

ACPC ACPC HYD PUMP 3A

ACPC ACPC HYD PUMP 3B

(8) Remove the electrical power from the aircraft (AMM 24−00−00−861−802).

(9) Open electrical bay door 211AL.

(10) Open main avionic−compartment door 811.

B. Procedure

Refer to Figure 1.

(1) Remove the inboard brake accumulator (1) (AMM 32−43−16−000−801).

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 9 of 17

Dec 22/2010

Revision A, Feb 03/2011
(2) Install the new inboard brake accumulator (1) (AMM 32−43−16−400−801).

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 10 of 17

Dec 22/2010

Revision A, Feb 03/2011
LEGEND

1. Inboard brakes accumulator

 0860204001 (Pre−Mod),

 90006691 (Post−Mod).

2. Outboard brakes accumulator

 0860204001 (Pre−Mod),

 90006691 (Post−Mod).

1

A

ba6701a01.cgm, eg, jun 18/2010

A

2

SERVICE BULLETIN 670BA−32−028

Accumulators of the Inboard and Outboard Brakes − Removal/Installation

Figure 1 (Sheet 1 of 1)

S.B. 670BA−32−028

Page 11 of 17

Dec 22/2010

Revision A, Feb 03/2011
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 follows:

CB−PANEL CB NO. NAME

CBP−1 F11 HYD SYST AC PUMP CONT 3B

CBP−2 F14 HYD SYST AC PUMP CONT 3A

ACPC ACPC HYD PUMP CONT 3B

ACPC ACPC HYD PUMP CONT 3A

(3) Do the servicing of the inboard brake accumulator (AMM

12−12−29−614−801).

(4) Do the servicing of the No. 3 hydraulic system reservoir (AMM

12−12−29−611−802).

(5) Bleed hydraulic system No. 3 (AMM 29−10−00−870−802).

(6) Bleed the inboard brakes (AMM 32−43−00−870−801).

(7) Do an operational test of the inboard brake accumulator (AMM

32−43−16−710−801).

(8) Close the electrical bay door 211AL.

(9) Close the main avionic−compartment door 811.

(10) When PART A of this service bulletin is completed, add the weight and

balance data shown in paragraph 1.I. of this service bulletin to the Weight

and Balance Manual. Under ‘Description of Change’ enter "Service Bulletin

670BA−32−028, Revision A, PART A, incorporated."

(11) When PART A of this service bulletin is completed, make this entry in the

applicable logbook(s): "Service Bulletin 670BA−32−028, Revision A, Landing

Gear − Brake System − Replacement of Accumulator P/N 0860204001 by

P/N 90006691, PART A, incorporated."

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 12 of 17

Dec 22/2010

Revision A, Feb 03/2011
PART B − Installation of the new outboard brake accumulator

A. Job Set−Up

(1) Reference Information

REFERENCE DESIGNATION

AMM 12−00−00−867−801 Standard Aircraft Configuration for

Maintenance

AMM 12−00−06−862−802 Release Hydraulic Pressure of

System No. 1 and No. 2

AMM 12−12−29−611−801 Servicing of the Hydraulic System

No. 1 and No. 2 Reservoirs

AMM 12−12−29−614−801 Servicing of the Hydraulic System

Accumulators

AMM 24−00−00−861−802 Remove Electrical Power from the

Aircraft

AMM 24−00−00−910−801 Electrical/Electronic Safety

Precautions

AMM 29−00−00−910−802 Hydraulic Technical Precautions

AMM 29−10−00−870−801 Bleed Hydraulic System No. 1 and

No. 2

AMM 32−43−00−870−801 Bleeding of the Brakes

AMM 32−43−16−000−801 Removal of the Brake Accumulator

AMM 32−43−16−400−801 Installation of the Brake

Accumulator

AMM 32−43−16−710−801 Operational Test of the Brake

Accumulator

AMM 52−45−56−000−801 Removal of the Hydraulic Access

Door (121AL)

AMM 52−45−56−400−801 Installation of the Hydraulic Access

Door (121AL)

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 13 of 17

Dec 22/2010

Revision A, Feb 03/2011
(2) Make sure that the aircraft is in standard configuration for maintenance

(AMM 12−00−00−867−801).

(3) Obey all the hydraulic technical precautions (AMM 29−00−00−910−802).

WARNING: OBEY ALL HYDRAULIC SAFETY PRECAUTIONS WHEN YOU

DO WORK ON THE HYDRAULIC SYSTEM AND HYDRAULIC

SYSTEM COMPONENTS. YOU CAN CAUSE INJURY TO

PERSONS AND DAMAGE TO EQUIPMENT.

(4) Release the hydraulic pressure from hydraulic system No. 2 (AMM

12−00−06−862−802).

(5) Operate the brake pedals of the pilot or co−pilot to release the hydraulic

pressure from the brake accumulators (approximately six times).

WARNING: OBEY ALL THE SAFETY PRECAUTIONS WHEN YOU DO

MAINTENANCE ON OR NEAR ELECTRICAL/ELECTRONIC

EQUIPMENT. YOU CAN CAUSE INJURY TO PERSONS AND/OR

DAMAGE TO EQUIPMENT.

(6) Obey all the electrical/electronic safety precautions (AMM

24−00−00−910−801).

(7) Open, safety, and tag the circuit breakers that follow:

CB−PANEL CB NO. NAME

CBP−1 F14 HYD SYST AC PUMP CONT 2

ACPC ACPC HYD PUMP 2

(8) Remove electrical power from the aircraft (AMM 24−00−00−861−802).

(9) Open the electrical bay door 211AL.

(10) Open the main avionic−compartment door 811.

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 14 of 17

Dec 22/2010

Revision A, Feb 03/2011
(11) Remove hydraulic access door 121AL (AMM 52−45−56−000−801).

B. Procedure

Refer to Figure 1.

(1) Remove the outboard brake accumulator (1) (AMM 32−43−16−000−801).

(2) Install the new outboard brake accumulator (1) (AMM 32−43−16−400−801).

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:

CB−PANEL CB NO. NAME

CBP−1 F14 HYD SYST AC PUMP CONT 2

ACPC ACPC HYD PUMP CONT 2

(3) Do the servicing of the outboard brake accumulator (AMM

12−12−29−614−801).

(4) Do the servicing of the No. 2 hydraulic system reservoir (AMM

12−12−29−611−801).

(5) Bleed hydraulic system No. 2 (AMM 29−10−00−870−801).

(6) Bleed the outboard brakes(AMM 32−43−00−870−801).

(7) Do an operational test of the outboard brake accumulator (AMM

32−43−16−710−801).

(8) Install the hydraulic access door 121AL (AMM 52−45−56−400−801).

(9) Close the electrical bay door 211AL.

(10) Close the main avionic−compartment door 811.

(11) When PART B of this service bulletin is completed, add the weight and

balance data shown in paragraph 1.I. of this service bulletin to the Weight

and Balance Manual. Under ‘Description of Change’ enter "Service Bulletin

670BA−32−028, Revision A, PART B, incorporated."

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 15 of 17

Dec 22/2010

Revision A, Feb 03/2011
(12) When PART B of this service bulletin is completed, make this entry in the

applicable logbook(s): "Service Bulletin 670BA−32−028, Revision A, Landing

Gear − Brake System − Replacement of Accumulator P/N 0860204001 by

P/N 90006691, PART B, incorporated."

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 16 of 17

Dec 22/2010

Revision A, Feb 03/2011
3. MATERIAL INFORMATION

A. Kit Information

None.

B. Consumable Information

For a list of consumables, refer to the different tasks 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 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

0860204001 Accumulator 2 DIS 90006691 Accumulator

Disposition code (DC) :

DIS: Discard Part.

SERVICE BULLETIN 670BA−32−028

S.B. 670BA−32−028

Page 17 of 17

Dec 22/2010

Revision A, Feb 03/2011
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-32-028 ISSUE: A 

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