# D

S.B. 8 ---32 ---170 Page 1 of 10 25 Feb 2011 LS 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 3244 NUMBER: 8 ---32 ---170 

### 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 --- Replacement of Suspect Parking Brake Accumulators --- 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 accumulators part numbers (p/n) 0860162001 or 0860162002 (York Industries Inc. or Tactair Fluid controls Inc). Refer to the “Procedure” section step B. (2) for SERIAL NUMBERS NOT AFFECTED” NOTE: Refer to Service Bulletin 8 ---32 ---172 for a list of units which are subject to FOC replacement.

### SERVICE BULLETIN 8 ---32 ---170

S.B. 8 ---32 ---170 Page 2 of 10 25 Feb 2011 LS 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: Operators should check spares for existence of parking brake hydraulic accumulators p/n 0860162001 or 0860162002. Accumulators with suspect serial numbers are subject to replacement. B. Reason Problem: Screw caps and/or end caps attached at either end of parking brake hydraulic accumulator (p/n 0860162001 or 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. 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 (or suspect) units, the operator is instructed to remove the existing “suspect” parking brake accumulator and install a “non suspect” accumulator. All removed “suspect” accumulators are rendered unserviceable. 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

### SERVICE BULLETIN 8 ---32 ---170

S.B. 8 ---32 ---170 Page 3 of 10 25 Feb 2011 LS --- the hydraulic pressure in the No.2 system is depleted --- an electrically grounded workstand or ladder is positioned under the right wing to 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 the table given in the Procedure section step B. (2) to determine disposition --- if required the parking brake accumulator is removed using existing AMM procedures and rendered unserviceable --- 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:

### SERVICE BULLETIN 8 ---32 ---170

S.B. 8 ---32 ---170 Page 4 of 10 25 Feb 2011 LS TASK MAN ---HOURS Job Set ---Up 1.00 Procedure 2.00 Test / RTS 1.00 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 Contact TACTAIR for price and availability at: Tactair Fluid Control Inc Attn: Customer Support 4806 West Taft Road Liverpool, NY 13088, USA Phone (315) 451 ---3928 FAX (315) 457 ---5595 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

### SERVICE BULLETIN 8 ---32 ---170

S.B. 8 ---32 ---170 Page 5 of 10 25 Feb 2011 LS 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) 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft If replacement of the parking brake accumulator is required contact TACTAIR at: Tactair Fluid Control Inc Attn: Customer Support 4806 West Taft Road Liverpool, NY 13088, USA Phone (315) 451 ---3928 FAX (315) 457 ---5595 B. Parts Required to Modify Spares Same as above para. 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 DIS 0860162002 R

### SERVICE BULLETIN 8 ---32 ---170

S.B. 8 ---32 ---170 Page 6 of 10 25 Feb 2011 LS 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 (render unserviceable) 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) De ---pressurize hydraulic systems by applying aileron and rudder flight control inputs.

### SERVICE BULLETIN 8 ---32 ---170

S.B. 8 ---32 ---170 Page 7 of 10 25 Feb 2011 LS (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 a 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). 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 compare the recorded part number & serial number on the accumulator with the part numbers & serial numbers listed in the table below:

### SERVICE BULLETIN 8 ---32 ---170

S.B. 8 ---32 ---170 Page 8 of 10 25 Feb 2011 LS Title (a) If the part number & serial number appears in the table above no additional action is required (refer to the Close Out section below). (b) If the part number & serial number does not appear in the table above 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. (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.

### SERVICE BULLETIN 8 ---32 ---170

S.B. 8 ---32 ---170 Page 9 of 10 25 Feb 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) If removed render “suspect” parking brake hydraulic accumulator unserviceable. (2) Install access panels 264DR and 262LT. (3) Remove all tools, equipment, and unwanted materials from the work area. (4) 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 this service bulletin number only after complete and functional incorporation of all work defined in this service bulletin.

### SERVICE BULLETIN 8 ---32 ---170

S.B. 8 ---32 ---170 Page 10 of 10 25 Feb 2011 LS Parking Brake Accumulator --- Locator View Figure 1 PARKING BREAK ACCUMULATOR

SCREW CAP SCREW CAP

3Jan 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 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