# D

S.B. 8 ---32 ---172 Page 1 of 12 15 Mar 2011 LS 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 3244 NUMBER: 8 ---32 ---172 

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

SUBJECT: Landing Gear --- Parking Brake System --- Recall of Parking Brake Accumulator --- Special Inspection & Rectification

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: All DHC ---8 Aircraft Models 102, 103, 106, 201, 202, 301, 311, 314 and 315 with parking brake hydraulic accumulator part numbers (p/n) 0860162002 (Tactair Fluid Controls Inc). Refer to the “EFFECTIVITY” section in enclosed vendor service bulletin (VSB) SB0860162002 ---32 ---1 for a list of affected serial numbers.
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.

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S.B. 8 ---32 ---172 Page 2 of 12 15 Mar 2011 LS Spares Affected: Operators should check spares for existence of parking brake hydraulic accumulators p/n 0860162002 listed in the VSB. Accumulators with suspect serial numbers are subject to recall / rework. B. Reason Problem: Screw caps attached at either end of parking brake hydraulic accumulator (p/n 0860162002) may develop cracks and/or could fracture when pressurized. This could result in loss of the No. 2 hydraulic system and possible damage to adjacent components and/or aircraft structure. The issue was discovered on a non DHC ---8 aircraft that uses similar accumulators. There have been no reported incidents on any DHC ---8 aircraft related to the described condition. Tactair is recalling Hydraulic Accumulators assembled between March 2005 and July 2007 that may have components supplied by York to Tactair as a part of the acquisition. Solution: This service bulletin gives the instructions to determine the part number & serial number of the existing parking brake hydraulic accumulator. If the part number & serial number is in the range of affected units (see NOTE below), the operator is instructed to remove the existing “suspect” parking brake accumulator and install a “new conforming” accumulator. All removed “suspect” accumulator are returned to the vendor for exchange. NOTE: Refer to the “EFFECTIVITY” section in the enclosed TACTAIR VSB SB0860162002 ---32 ---2 for a list of affected units. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: --- all aircraft electrical power is selected to OFF --- lock pins are installed thru each main gear and main gear door mechanism --- the nose gear ground lock is engaged --- a warning sign is installed on the external hydraulic connection --- the hydraulic pressure in the No.2 system is depleted --- an electrically grounded workstand or ladder is positioned under the right wing to

### SERVICE BULLETIN 8 ---32 ---172

S.B. 8 ---32 ---172 Page 3 of 12 15 Mar 2011 LS fuselage area (under the “wing root”) --- two access panel are removed --- the parking brake accumulator is located --- the part number and serial number of the parking brake accumulator is recorded and checked against a table in enclosed TACTAIR VSB to determine disposition --- if required the parking brake accumulator is removed using existing AMM procedures and returned to the vendor per instructions given in enclosed TACTAIR VSB SB0860162002 ---32 ---1 --- a new accumulator (non suspect unit) is installed to agree with existing AMM instructions --- Close ---Out D. Compliance Bombardier Inc. recommends accomplishment of the special inspection and rectification conveyed by this service bulletin at the earliest opportunity unless otherwise directed by the operator’s 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 5 man ---hours to complete this service bulletin if replacement of the parking brake accumulator is required. The breakdown of the man ---hours is shown in the table that follows: TASK MAN ---HOURS Job Set ---Up 1.00 Procedure 2.00 Test / RTS 1.00 Close ---Out 1.00

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S.B. 8 ---32 ---172 Page 4 of 12 15 Mar 2011 LS 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 the MATERIAL INFORMATION section in enclosed TACTAIR VSB SB0860162002 ---32 ---1. H. Tooling --- Price and Availability None I. Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected Dash 8 Illustrated Parts Catalogue PSM 1 ---8 ---4 and

.................... PSM 1 ---82 ---4 and PSM 1 ---83 ---4 L. References The initial issue of this service bulletin was prepared to the related data that follows: PCA 05765 Revision 1 (for internal reference only) Tactair Fluid Controls Inc. SB0860162002 ---32 ---1.

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S.B. 8 ---32 ---172 Page 5 of 12 15 Mar 2011 LS 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft If replacement of the parking brake accumulator is required, refer to the MATERIAL INFORMATION section in enclosed TACTAIR VSB SB0860162002 ---32 ---1. B. Parts Required to Modify Spares If replacement of a spare parking brake accumulator is required, refer to the MATERIAL INFORMATION section in enclosed TACTAIR VSB SB0860162002 ---32 ---1. C. Special Tools and Equipment Required None 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 0860162001 and/or 0860162002 Hydraulic Accumulators 1 C RWK 0860162002 R 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.

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S.B. 8 ---32 ---172 Page 6 of 12 15 Mar 2011 LS DC Disposition DIS Discard Part. MUI Multiple Usage Item: Return to stock if serviceable. RWK If affected replace existing part in accordance with this service bulletin and enclosed VSB SB0860162002 ---32 ---2 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 part number. X Reworked part and superseding part are functionally and physically equivalent but not identical. 3. ACCOMPLISHMENT INSTRUCTIONS A. Job Set ---Up (1) Placard and select all aircraft electrical power to OFF. (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. (4) Install wheel chocks at the nose landing gear and the main landing gear. (5) Depressurize hydraulic systems by applying aileron and rudder flight control inputs. (6) Deplete parking brake accumulator hydraulic pressure by applying and releasing the EMERG. brake handle approximately 10 times. (7) Install a warning sign on the external hydraulic connection. (8) Position an electrically grounded workstand or ladder as required to gain access to the parking brake accumulator (wing to fuselage ‘wing root’ right side) (9) Remove the access panels 264DR and 262LT (Refer to AMM 06 ---40 ---10).

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S.B. 8 ---32 ---172 Page 7 of 12 15 Mar 2011 LS B. Procedure

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. (1) Gain access to the parking brake accumulator (wing root right side, see Figure 1). Locate the data plate and record the part number and 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. (2) To determine disposition of an existing Parking Brake Accumulator p/n 0860162002 compare the recorded part number & serial number on the accumulator with the part numbers & serial numbers listed in section 1 PLANNING INFORMATION of enclosed TACTAIR VSB SB0860162002 ---32 ---1. (a) If the part number & serial number appears in the enclosed TACTAIR VSB replacement is required. Remove the “suspect” accumulator to agree with procedures given in applicable AMM. For 100 and 300 series aircraft refer to AMM Chapter 32 ---44 ---12. For 200 series aircraft refer to AMM TASK 32 ---44 ---12 ---000 ---809. (b) If the part number & serial number does not appear in the TACTAIR SB replacement is not required. No additional action is required (refer to the Close Out section below). (3) Install a “non suspect” parking brake hydraulic accumulator to agree with procedures given in applicable AMM. For 100 and 300 series aircraft refer to AMM Chapter 32 ---44 ---12. For 200 series aircraft refer to AMM TASK 32 ---44 ---12 ---400 ---802.

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S.B. 8 ---32 ---172 Page 8 of 12 15 Mar 2011 LS 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. (4) Make sure to do a visual check of the parking brake accumulator hydraulic and pneumatic connections for leaks after the system is serviced then refer to the Close Out section below. C. Close Out (1) Install access panels 264DR and 262LT. (2) Remove all tools, equipment, and unwanted materials from the work area. (3) On incorporation of this Service Bulletin, make an entry that conforms to local regulatory requirements in the applicable logbook(s). Enter component serial numbers if applicable. Enter numbers only after complete and functional incorporation of all work defined in this service bulletin. (4) If removed return “suspect” parking brake hydraulic accumulator to Tactair Customer Support for replacement (refer to the MATERIAL INFORMATION section in enclosed TACTAIR SB0860162002 ---32 ---1 for additional details).

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S.B. 8 ---32 ---172 Page 9 of 12 15 Mar 2011 LS Parking Brake Accumulator --- Locator View Figure 1 PARKING BRAKE ACCUMULATOR

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### This Page Intentionally Blank 2Jan 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 V Job 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