D

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SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 3231 NUMBER: 84 ---32 ---89

BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS

SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND

URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Landing Gear --- MLG Retraction Actuator Retract Port Flexible Hose

--- Inspection and Rectification

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

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

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:

None
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B. Reason

Problem: In the event of a MLG retraction actuator, retract port flexible hose failure,

in ---flight vibrations may cause excessive hydraulic fluid leakage. This

could lead to an undamped extension of the MLG, which may result in MLG

structural failure, leading to an asymmetric landing configuration.

Solution: The retract actuator retract port flexible hose is replaced with a new hose.

C. Description

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

follow:

--- aircraft is put into standard configuration for maintenance

--- 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

--- a detailed inspection of the left and right MLG retract actuator retract port flexible

hose is done

--- if required hose is replaced

--- an operational test of the landing gear primary extension and retraction is done

--- close out.

D. Compliance

Bombardier Inc. highly recommends that this Service Bulletin be done within 600

flight hours and subsequently at intervals not to exceed 600 flight hours from

previous inspection.

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).
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F. Manpower

It will take an estimated 1 man ---hour to complete the inspection contained on this

service bulletin. The breakdown of the man ---hours is shown in the table that

follows:

TASK MAN ---HOURS

Job Set ---Up 0.25

Procedure 0.50

Test / RTS 0.00

Close ---Out 0.25

It will take an estimated 3.5 man ---hours to complete the rectification contained on

this service bulletin. The breakdown of the man ---hours is shown in the table that

follows:

TASK MAN ---HOURS

Job Set ---Up 0.25

Procedure 2.00

Test / RTS 1.00

Close ---Out 0.25

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

None

H. Tooling --- Price and Availability

None

I. Weight and Balance

None
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J. Electrical Load Data

Not affected

K. Publications Affected

None

L. References

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

and related data that follows:

PCA 42970 Revision 2 (for internal reference only)

Transport Canada Airworthiness Directive Pending

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

(1) Detailed Parts List:

Quantity

Per Aircraft

Part Number Description Remarks

2 46455 ---121 Flexible Hose

B. Parts Required to Modify Spares

None

C. Special Tools and Equipment Required

None

D. Existing Parts Accountability

None
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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.

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.

(2) Set up the work platforms or ladders as required to gain access to the Main

Landing Gear retraction actuator. Make sure the work platforms or ladders are

electrically grounded.

B. Procedure

(1) Perform a detailed visual inspection of the left and right MLG retract actuator

retract port flexible hose for any major defects and/or damages in accordance

with Maintenance Manual PSM 1 ---84 ---2 Task 20 ---20 ---03 ---200 ---801. Refer to

Figures 1, 2 and 3.

(2) If major defects and/or damage is found, do the following:

(a) Remove existing flexible hose. Refer to Maintenance Manual PSM 1 ---84 ---2

Task 32 ---31 ---11 ---000 ---804.

(b) Install new flexible hose. Refer to Maintenance Manual PSM 1 ---84 ---2 Task

32 ---31 ---11 ---400 ---804.
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(3) If no major defects and/or damage is found no further work is required. Return

aircraft to normal condition.

C. Close Out

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

(2) On completion of this service bulletin, make the following entry in the

appropriate logbooks: “Service Bulletin 84 ---32 ---89 Landing Gear --- MLG

Retraction Actuator Retract Port Flexible Hose --- Inspection and Rectification

accomplished.”
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Figure 1
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Figure 2

RETRACT PORT & HOSE
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Figure 3

RETRACT HOSE

RETRACT HOSE
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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