D

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SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 2911 NUMBER: 84 ---32 ---88

SUBJECT: Landing Gear --- Introduction of Single End Cap Accumulator ---

ModSum 4 ---113653

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4001,

4003, 4004, 4006, 4008 thru 4337. Refer to section 1 of

enclosed Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2

for affected part numbers and serial numbers.

Production: ModSum 4 ---113653 will be installed before delivery on

applicable DHC ---8 Aircraft at Serial Number 4338 and

subsequent.

NOTE: The instructions in this service bulletin are only applicable to the systems

and parts installed at the time of delivery on the aircraft or as changed by

Bombardier Aerospace Service Bulletin(s). Before you do this bulletin,

examine all STC or equivalent action changes to make sure this bulletin

can be completed.

Spares Affected:

Refer to paragraph 1. EFFECTIVITY in enclosed Goodrich Service Bulletin 08

60197 001 ---32 ---70 R2 for a list of spares affected. Review spares and

procurement systems to determine the existence of any listed parts. See

Paragraph 2.D., Existing Parts Accountability, for disposition.
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B. Reason

Problem: Screw caps and/or end caps attached to parking brake hydraulic

accumulator part number 08 60197 001 (with suspect serial numbers) may

develop cracks and or could fracture when pressurized. The result of a

fractured screw cap and/or end cap could cause partial loss of the No. 2

Hydraulic System, damage to adjacent components and/or damage to

aircraft structure.

The issue was discovered on non Q400 aircraft that use a similar type of

accumulator. There have been no reported incidents on any Q400

aircraft related to the described condition.

Solution: This service bulletin gives the instructions to inspect the part number/serial

number of the accumulator. If the part number/serial number is in the range

of affected units, the operator is instructed to remove and replace the

existing parking brake accumulator with a new single ended accumulator.

The removed accumulator is destroyed according to vendor

requirements.

C. Description

The procedures in this service bulletin give the instructions to do the tasks that

follow:

--- aircraft electrical power is removed

--- the nose landing gear lock is engaged

--- the main landing gear lock pins are installed thru each main gear and main gear

door mechanism

--- all hydraulic pressure is removed

--- access is gained to the parking brake accumulator located in the left hand side wing

root

--- the part number/serial number of the accumulator is recorded and checked against

the effectivity in the enclosed vendor service bulletin

--- the parking brake accumulator is removed and replaced if the part number/serial

number is in the range of affected units. The removed accumulator is scrapped

and proof of destruction is sent to the vendor

--- close out.

D. Compliance

Bombardier Inc. recommends incorporation of this service bulletin at the earliest

opportunity unless otherwise directed by the operator’s airworthiness authority.
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Refer to paragraph 5. COMPLIANCE in enclosed Goodrich Service Bulletin 08

60197 001 ---32 ---70 R2 for specific compliance times.

E. Approval

The technical content of this service bulletin has been approved under the

authority of the Transport Canada Civil Aviation (TCCA) Design Approval

Organization No: DAO #93 ---Q ---02.

This Service Bulletin does not affect Airworthiness Limitations (AWLs) or Damage

Tolerance Inspections (DTIs).

F. Manpower

It will take an estimated 5.00 man ---hours to complete this service bulletin. The

breakdown of the man ---hours is shown in the table that follows:

TASK MAN ---HOURS

Job Set ---Up 1.00

Procedure 3.00

Test / RTS N/A

Close ---Out 1.00

For any on---site labor assistance, please speak with a Fleet Services representative for

a quote. The Fleet Services group can be contacted via the Q Series Technical Help

Desk by telephone at 416---375---4000 or email at : thd.qseries@aero.bombardier.com

G. Material --- Price and Availability

Refer to paragraph 8. MATERIAL COST AND AVAILABILITY in enclosed

Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2.

H. Tooling --- Price and Availability

None

I. Weight and Balance

A/C Type and

Model

Weight (Lb) Arm (Inches)

Moment

(Inches x Lb)

x 0.001

DHC ---8 Model 401 1.146 464.948 0.533

DHC ---8 Model 402 1.146 464.948 0.533
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J. Electrical Load Data

Not affected

K. Publications Affected

Dash 8 Illustrated Parts Catalogue PSM 1 ---84 ---4 ....................

L. References

The initial issue of this service bulletin was prepared to the engineering drawings

and related data that follows:

ModSum 4Q113653 Rev. ‘D’

ModSum 4 ---113653 Rev. ‘F’

ModSum 4N113653 Rev. ‘F’

Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2 dated Feb 01/11

PCA 43045 Revision 6 (for internal reference only)

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

None

B. Parts Required to Modify Spares

None

C. Special Tools and Equipment Required

None

D. Existing Parts Accountability

Refer to SECTION III --- MATERIAL INFORMATION in enclosed Goodrich Service

Bulletin 08 60197 001 ---32 ---70 R2.
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3. ACCOMPLISHMENT INSTRUCTIONS

A. Job Set ---Up

(1) Placard and select all aircraft electrical power to OFF. Obey all relevant

WARNINGS and CAUTIONS (refer to AMM TASK’S 24 ---00 ---00 ---861 ---802 and

24 ---00 ---00 ---910 ---801).

WARNING: YOU MUST INSTALL THE LOCKPINS ON THE MAIN LANDING GEAR.

MAKE SURE YOU ENGAGE THE NOSE GEAR LOCK. IF YOU DO NOT

DO THIS, THE LANDING GEAR CAN ACCIDENTALLY RETRACT. THIS

CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE

EQUIPMENT.

(2) Make sure that lock pins are installed thru each main gear and main gear door

mechanism.

(3) Make sure the nose gear ground lock is engaged.

WARNING: OBEY ALL THE HYDRAULIC SAFETY PRECAUTIONS WHEN YOU DO

WORK ON THE HYDRAULIC SYSTEM OR A HYDRAULIC SYSTEM

COMPONENT. IF YOU DO NOT DO THIS, YOU CAN CAUSE INJURIES

TO PERSONS AND DAMAGE TO EQUIPMENT.

WARNING: BE SURE THAT THE HYDRAULIC PRESSURE IS OFF, AND THAT

THERE IS NO PRESSURE IN THE HYDRAULIC SYSTEM. IF YOU DO

NOT DO THIS YOU CAN CAUSE INJURIES TO PERSONS AND

DAMAGE TO THE EQUIPMENT.

(4) Install wheel chocks at the nose landing gear and at the main landing gear.

(5) Refer to TASK 29 ---00 ---00 ---863 ---802 and TASK 29 ---00 ---00 ---863 ---804 and

make sure all hydraulic power is off.

(6) Operate the EMERG BRAKE lever in the flight compartment until there is no

parking brake system pressure.

(7) Set up the work platforms or ladders as required to gain access to the parking

brake accumulator located in the right hand side wing root. Make sure the work

platforms or ladders are electrically grounded.

(8) Remove access panels 264CR and 264DR to gain access to the parking brake

accumulator.
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B. Procedure

(1) Inspect and record the part number/serial number of the accumulator.

WARNING: HYDRAULIC FLUID MAY CAUSE SKIN IRRITATION. AVOID

PROLONGED OR REPEATED CONTACT WITH SKIN. IN CASE OF EYE

CONTACT, FLUSH EYES THOROUGHLY WITH WATER AND SEEK

PROMPT MEDICAL ATTENTION. IN CASE OF INGESTION, SEEK

PROMPT MEDICAL ATTENTION.

WARNING: MAKE SURE THAT THE HYDRAULIC POWER IS SHUT OFF AND THAT

THE HYDRAULIC SYSTEM IS NOT PRESSURIZED. IF YOU DO NOT DO

THIS YOU CAN CAUSE INJURIES TO PERSONS AND/OR DAMAGE TO

EQUIPMENT.

(2) Compare the part number/serial number of the accumulator with the data in

section 1 of enclosed Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2. If the

part number/serial number falls within the range of affected units, refer to AMM

TASK 32 ---44 ---11 ---000 ---801 and TASK 32 ---44 ---11 ---400 ---801 and replace the

accumulator with new single end cap Goodrich Accumulator 48904 ---1.

(3) Scrap the removed accumulator and provide proof of destruction to Goodrich.

NOTE: A letter on operator’s letterhead signed by an appropriately authorized

individual stating that “Accumulators XXX ---serial numbers XXX have been

destroyed or mutilated as to render them unserviceable and cannot be

repaired” is acceptable proof of destruction. Digital photographs

depicting mutilation with part numbers and serial numbers would also be

acceptable.

(4) Do a visual check of the accumulator hydraulic and pneumatic connections for

leaks after the system is bled and serviced.

C. Close Out

(1) Install access panels 264CR and 264DR.

(2) Disengage the nose gear ground lock.

(3) Remove the lock pins from each main gear and main gear door mechanism.

(4) Remove wheel chocks from the nose landing gear and at the main landing gear.

(5) Remove all tools and equipment from the work area.

(6) On incorporation of this Special Inspection and Rectification service bulletin,

make an entry that conforms to local regulatory requirements in the applicable

logbook(s). Enter component serial numbers if applicable. Enter this service

bulletin number only after complete and functional incorporation of all work

defined in this service bulletin.
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Parking Brake Accumulator

Figure 1

SEE FIGURE 2
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Detail --- Parking Brake Accumulator

Figure 2
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Parking Brake Accumulator --- Pre and Post Modsum Configurations

Figure 3

PRE MODSUM 4 ---113653

ACCUMULATOR PART NUMBER 08 ---60197 ---001

POST MODSUM 4 ---113653

ACCUMULATOR PART NUMBER 48904 ---1
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This Page Intentionally Blank

1
Jan 2009

SERVICE BULLETIN (SB) --- RECORD OF INCORPORATION

--- Q SERIES DASH 8 AIRCRAFT

To: Partner Data Co ---Ordinator (Toronto), Bombardier Aerospace Commercial Aircraft

Phone: (1) 416 375 3534 Facsimile: (1) 416 375 4538

E --mail: cmdb.requests@aero.bombardier.com

From:

Company:

Phone: Extn:

Facsimile: Date:

E --mail:

The data that you provide below will help us record the incorporation of this ModSum

and the aircraft effectivity in the maintenance manual.

Operator: Service Bulletin: __________________ Revision: _________

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Aircraft Serial Number: Model Number: Date Bulletin Completed:

Fax this sheet to (1) 416 375 4538 or Email PDF to:

cmdb.requests@aero.bombardier.com
Feb 2009

SERVICE BULLETIN (SB) --- COMMENT SHEET --- Q SERIES DASH 8 AIRCRAFT

To: SB Focal (Toronto), Bombardier Aerospace Commercial Aircraft

Phone: (1) 416 375 4078 Facsimile: (1) 416 375 4538

E --mail: syed.rizvi@aero.bombardier.com

From:

Company:

Phone: Extn:

Facsimile: Date:

E --mail:

Select appropriate box(es) and add comments or suggestions you would like us to know

that may enhance the quality of our service bulletins.

Service Bulletin: Revision: ModSum:

1. PLANNING INFORMATION

V Effectivity V Reason V Description V Compliance

V Approval V Manpower V Material V Weight and Balance

V Electrical Load V Tooling V References V Publications Affected

2. MATERIAL INFORMATION

V Kit Content V Special Tools/Equipment V Parts to Modify Spares

V Consumables V Disposition of Existing Parts V Other

3. ACCOMPLISHMENT INSTRUCTIONS

V Job Set ---Up V Procedure V Close---Out V Test

V Illustration(s) V Other

4. COMMENTS, REMARKS, SUGGESTIONS

Fax this sheet to (1) 416 375 4538 or Email PDF to:

syed.rizvi@aero.bombardier.com