# D

S.B. 8 ---32 ---156 Page 1 of 8 26 Feb 2010 JR 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 3200 NUMBER: 8 ---32 ---156 

### BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Landing Gear --- Nose Landing Gear --- Replacement of Pushrod Assembly to Substitute T4 with a T6 --- ModSum 8Q101335

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: DHC ---8 Aircraft Models 201, 202, 301, 311, 314 and 315 Serial Numbers 552 thru 588. Spares Affected: The following is a list of spares affected by this change. Review spares and procurement systems to determine the existence of any listed parts. See Paragraph 2.D., Existing Parts Accountability, for disposition.
Part Number Description Remarks 83232012 ---001 Pushrod --- Nose Landing Gear Manufactured after September 2000

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S.B. 8 ---32 ---156 Page 2 of 8 26 Feb 2010 JR B. Reason Some pushrods may have been incorrectly manufactured with tubes having the wrong heat treat condition using 6061 ---T4 instead of 6061 ---T6. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: --- the affected pushrod is removed, destroyed and discarded --- a new pushrod is installed. A functional test of the nose landing gear doors is performed D. Compliance Bombardier Aerospace highly recommends that this modification be incorporated at the operators earliest opportunity, unless otherwise directed by their Airworthiness Authority. 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. F. Manpower It will take an estimated 2 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 0.00 Procedure 2.00 Test / RTS 0.00 Close ---Out 0.00

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S.B. 8 ---32 ---156 Page 3 of 8 26 Feb 2010 JR G. Material --- Price and Availability ModKit 8MK4279 ---001 is available through the Customer Accounts Service Team at Bombardier Aerospace Regional Aircraft division. Operators should submit a purchase order specifying aircraft serial number(s) to: Bombardier Aerospace Customer Accounts Services Team (Mail Stop N11 ---32) 123 Garratt Blvd. Toronto Ontario Canada M3K ---1Y5 Facsimile: (416) 375 ---3060 Telephone : (416) 375 ---3920
Kit Number Description 8MK4279 ---001 Retrofit Kit ---Pushrod Replacement, Nose Landing Gear
H. Weight and Balance None I. Electrical Load Data Not affected J. Publications Affected Dash 8 Illustrated Parts Catalogue PSM 1 ---82 ---4 and

.................... PSM 1 ---83 ---4 Modifications Manual PSM 1 ---813 ---12

...............................

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S.B. 8 ---32 ---156 Page 4 of 8 26 Feb 2010 JR K. References The initial issue of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV 8MK4279 1 A ModSum 8Q101335 Rev. ‘B’ PCA 4522 Revision --- --- (for internal reference only) 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft (1) Modification Kit 8MK4279 ---001 (2) Detailed Kit Content:

Quantity Per Kit ---001 Part Number Description Remarks
1 8MK4279 Kit Drawing 2 MS24665 ---153 Cotter Pin 4 AN960 ---516 Washer 1 83232012 ---951 Pushrod ---NLG B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None

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S.B. 8 ---32 ---156 Page 5 of 8 26 Feb 2010 JR D. Existing Parts Accountability The following parts may be affected by this service bulletin. Indented parts are components of the next higher assembly. The quantity (Qty.) column lists the quantity that may be affected per aircraft for non ---indented parts and the quantity per next higher assembly for indented parts.
Existing Part Number Description Qty. IC DC New Part Number PNC 83232012 ---001 Pushrod 1 B DIS 83232012 ---951 S IC Interchangeability Code A Not interchangeable. B Removed Part. No direct replacement. C Conditionally Interchangeable. Installation of superseded part negates the intent of this service bulletin. DC Disposition DIS Discard Part. MUI Multiple Usage Item: Return to stock if serviceable. RWK Rework existing part in accordance with this service bulletin. RWI Rework existing part per ..... SAL Salvage. Return to operator’s stores for salvage consideration. PNC Part Number Code N No equivalent Bombardier Inc. part number for reworked part. Indicate on part that this service bulletin has been accomplished. R Part number after rework. S Superseding or equivalent part number. X Reworked part and superseding part are functionally and physically equivalent but not identical. 3. ACCOMPLISHMENTINSTRUCTIONS A. Job Set ---Up (1) Either pull and clip circuit breakers required to isolate affected circuits or placard and select aircraft electrical power to OFF. Obey all relevant WARNINGS and CAUTIONS detailed in Maintenance Manual PSM 1 ---82 ---2 or PSM 1 ---83 ---2. (2) Lock the nose landing gear doors. Refer to Maintenance Manual Chapter PSM 1 ---82 ---2 TASK 32 ---00 ---00 ---840 ---801 or PSM 1 ---83 ---2 Chapter 32 ---20 ---21.

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S.B. 8 ---32 ---156 Page 6 of 8 26 Feb 2010 JR WARNING: MAKE SURE THAT THE LOCKPINS ARE INSTALLED IN THE MAIN LANDING GEAR. MAKE SURE THE NOSE GEAR LOCK IS ENGAGED. IF THIS IS NOT DONE, THE LANDING GEAR CAN ACCIDENTALLY RETRACT. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE 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.

B. Procedure (1) Remove and discard pushrod 83232012 ---001 from the nose landing gear forward door as follows: (Refer to Maintenance Manual PSM 1 ---82 ---2 TASK 32 ---22 ---11 ---030 ---801 or PSM 1 ---83 ---2 Chapter 32 ---20 ---21 for access location and to drawing 8MK4279) (a) Disconnect one end of the pushrod from the bellcrank by removing one cotter pin MS24665 ---153, one nut MS14145L5, two washers AN960 ---516, one bolt NAS1105 ---12D and one bushing NAS75 ---5 ---006. Keep all hardware except for washers and cotter pin. (b) Disconnect the other end of the pushrod from the door attachment bracket by removing one cotter pin MS24665 ---153, one nut MS14145L5, two washers AN960 ---516 and one bolt NAS1105 ---20D. Keep all hardware except for washers and cotter pin. (2) After removing each defective Pushrod (P/N 83232012 ---001) cut each part into two pieces in a way that will render them UNSERVICEABLE, wire lock the two pieces together. Tag the parts and dispose them as instructed by your Local Airworthiness Authority. (3) Install and rig new pushrod 83232012 ---951 to the nose landing gear forward door as follows: (Refer to Maintenance Manual PSM 1 ---82 ---2 TASK 32 ---22 ---11 ---830 ---801 or PSM 1 ---83 ---2 Chapter 32 ---20 ---21 for rigging instructions and to drawing 8MK4279) (a) Connect one end of the pushrod to the door attachment bracket using one nut MS14145L5, two new washers AN960 ---516 and one bolt NAS1105 ---20D. Torque nut 40 to 80 inch pounds and lock with new cotter pin MS24665 ---153.

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S.B. 8 ---32 ---156 Page 7 of 8 26 Feb 2010 JR (b) Connect the other end of the pushrod to the bellcrank by using one nut MS14145L5, two new washers AN960 ---516, one bolt NAS1105 ---12D and one bushing NAS75 ---5 ---006. Torque nut 50 to 70 inch pounds and lock with new cotter pin MS24665 ---153. C. Close Out (1) Remove all tools and equipment from the work area. (2) Perform a functional test of the Nose Landing Gear Doors per Maintenance Manual PSM 1 ---82 ---2 TASK 32 ---30 ---00 ---720 ---801 or PSM 1 ---83 ---2 Chapter 32 ---20 ---21. (3) On incorporation of this ModSum, make an entry that conforms to local regulatory requirements in the applicable logbook(s). Enter component serial numbers if applicable. Enter this ModSum number only after complete and functional incorporation of all work defined in this service bulletin.

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S.B. 8 ---32 ---156 Page 8 of 8 26 Feb 2010 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 VSpecial 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