# D

S.B. 84 ---32 ---89

Page 1 of 10 22 Mar 2011 JR 

# 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 INFORMA TION 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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S.B. 84 ---32 ---89 Page 2 of 10 22 Mar 2011 JR 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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S.B. 84 ---32 ---89 Page 3 of 10 22 Mar 2011 JR 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

### SERVICE BULLETIN 84 ---32 ---89

S.B. 84 ---32 ---89 Page 4 of 10 22 Mar 2011 JR 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 INFORMA TION 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

### SERVICE BULLETIN 84 ---32 ---89

S.B. 84 ---32 ---89 Page 5 of 10 22 Mar 2011 JR 3. ACCOMPLISHMENTINSTRUCTIONS 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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S.B. 84 ---32 ---89 Page 6 of 10 22 Mar 2011 JR (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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S.B. 84 ---32 ---89 Page 7 of 10 22 Mar 2011 JR Figure 1

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S.B. 84 ---32 ---89 Page 8 of 10 22 Mar 2011 JR Figure 2 RETRACT PORT & HOSE

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S.B. 84 ---32 ---89 Page 9 of 10 22 Mar 2011 JR Figure 3 RETRACT HOSE RETRACT HOSE

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S.B. 84 ---32 ---89 Page 10 of 10 22 Mar 2011 JR 

### This Page Intentionally Blank 1Jan 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.comFeb 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 VApproval V Manpower V Material VWeight and Balance V Electrical Load VTooling 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 VJob Set ---Up V Procedure V Close---Out VTest 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