# D

S.B. 84 ---32 ---88

Page 1 of 12 16 Feb 2011 M.G. 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 2911 NUMBER: 84 ---32 ---88
SUBJECT: Landing Gear --- Introduction of Single End Cap Accumulator --- ModSum 4 ---113653

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003, 4004, 4006, 4008 thru 4337. Refer to section 1 of enclosed Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2 for affected part numbers and serial numbers. Production: ModSum 4 ---113653 will be installed before delivery on applicable DHC ---8 Aircraft at Serial Number 4338 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: Refer to paragraph 1. EFFECTIVITY in enclosed Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2 for a list of spares affected. Review spares and procurement systems to determine the existence of any listed parts. See Paragraph 2.D., Existing Parts Accountability, for disposition.

### SERVICE BULLETIN 84 ---32 ---88

S.B. 84 ---32 ---88 Page 2 of 12 16 Feb 2011 M.G. B. Reason Problem: Screw caps and/or end caps attached to parking brake hydraulic accumulator part number 08 60197 001 (with suspect serial numbers) may develop cracks and or could fracture when pressurized. The result of a fractured screw cap and/or end cap could cause partial loss of the No. 2 Hydraulic System, damage to adjacent components and/or damage to aircraft structure. The issue was discovered on non Q400 aircraft that use a similar type of accumulator. There have been no reported incidents on any Q400 aircraft related to the described condition. Solution: This service bulletin gives the instructions to inspect the part number/serial number of the accumulator. If the part number/serial number is in the range of affected units, the operator is instructed to remove and replace the existing parking brake accumulator with a new single ended accumulator. The removed accumulator is destroyed according to vendor requirements. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: --- 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 --- all hydraulic pressure is removed --- access is gained to the parking brake accumulator located in the left hand side wing root --- the part number/serial number of the accumulator is recorded and checked against the effectivity in the enclosed vendor service bulletin --- the parking brake accumulator is removed and replaced if the part number/serial number is in the range of affected units. The removed accumulator is scrapped and proof of destruction is sent to the vendor --- close out. D. Compliance Bombardier Inc. recommends incorporation of this service bulletin at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority.

### SERVICE BULLETIN 84 ---32 ---88

S.B. 84 ---32 ---88 Page 3 of 12 16 Feb 2011 M.G. Refer to paragraph 5. COMPLIANCE in enclosed Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2 for specific compliance times. 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). F. Manpower It will take an estimated 5.00 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 1.00 Procedure 3.00 Test / RTS N/A 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 Refer to paragraph 8. MATERIAL COST AND AVAILABILITY in enclosed Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2. H. Tooling --- Price and Availability None I. Weight and Balance
A/C Type and Model Weight (Lb) Arm (Inches) Moment (Inches x Lb) x 0.001 DHC ---8 Model 401 1.146 464.948 0.533 DHC ---8 Model 402 1.146 464.948 0.533

### SERVICE BULLETIN 84 ---32 ---88

S.B. 84 ---32 ---88 Page 4 of 12 16 Feb 2011 M.G. J. Electrical Load Data Not affected K. Publications Affected Dash 8 Illustrated Parts Catalogue PSM 1 ---84 ---4

.................... L. References The initial issue of this service bulletin was prepared to the engineering drawings and related data that follows: ModSum 4Q113653 Rev. ‘D’ ModSum 4 ---113653 Rev. ‘F’ ModSum 4N113653 Rev. ‘F’ Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2 dated Feb 01/11 PCA 43045 Revision 6 (for internal reference only) 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft None B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None D. Existing Parts Accountability Refer to SECTION III --- MATERIAL INFORMATION in enclosed Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2.

### SERVICE BULLETIN 84 ---32 ---88

S.B. 84 ---32 ---88 Page 5 of 12 16 Feb 2011 M.G. 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. (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. 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. (4) Install wheel chocks at the nose landing gear and at the main landing gear. (5) Refer to TASK 29 ---00 ---00 ---863 ---802 and TASK 29 ---00 ---00 ---863 ---804 and make sure all hydraulic power is off. (6) Operate the EMERG BRAKE lever in the flight compartment until there is no parking brake system pressure. (7) Set up the work platforms or ladders as required to gain access to the parking brake accumulator located in the right hand side wing root. Make sure the work platforms or ladders are electrically grounded. (8) Remove access panels 264CR and 264DR to gain access to the parking brake accumulator.

### SERVICE BULLETIN 84 ---32 ---88

S.B. 84 ---32 ---88 Page 6 of 12 16 Feb 2011 M.G. B. Procedure (1) Inspect and record the part number/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. 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. (2) Compare the part number/serial number of the accumulator with the data in section 1 of enclosed Goodrich Service Bulletin 08 60197 001 ---32 ---70 R2. If the part number/serial number falls within the range of affected units, refer to AMM TASK 32 ---44 ---11 ---000 ---801 and TASK 32 ---44 ---11 ---400 ---801 and replace the accumulator with new single end cap Goodrich Accumulator 48904 ---1. (3) Scrap the removed accumulator and provide proof of destruction to Goodrich. NOTE: A letter on operator’s letterhead signed by an appropriately authorized individual stating that “Accumulators XXX ---serial numbers XXX have been destroyed or mutilated as to render them unserviceable and cannot be repaired” is acceptable proof of destruction. Digital photographs depicting mutilation with part numbers and serial numbers would also be acceptable. (4) Do a visual check of the accumulator hydraulic and pneumatic connections for leaks after the system is bled and serviced. C. Close Out (1) Install access panels 264CR and 264DR. (2) Disengage the nose gear ground lock. (3) Remove the lock pins from each main gear and main gear door mechanism. (4) Remove wheel chocks from the nose landing gear and at the main landing gear. (5) Remove all tools and equipment from the work area. (6) On incorporation of this Special Inspection and Rectification 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.

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S.B. 84 ---32 ---88 Page 7 of 12 16 Feb 2011 M.G. Parking Brake Accumulator Figure 1 SEE FIGURE 2

### SERVICE BULLETIN 84 ---32 ---88

S.B. 84 ---32 ---88 Page 8 of 12 16 Feb 2011 M.G. Detail --- Parking Brake Accumulator Figure 2

### SERVICE BULLETIN 84 ---32 ---88

S.B. 84 ---32 ---88 Page 9 of 12 16 Feb 2011 M.G. Parking Brake Accumulator --- Pre and Post Modsum Configurations Figure 3 PRE MODSUM 4 ---113653 ACCUMULATOR PART NUMBER 08 ---60197 ---001

POST MODSUM 4 ---113653 ACCUMULATOR PART NUMBER 48904 ---1

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S.B. 84 ---32 ---88 Page 12 of 12 16 Feb 2011 M.G. 

### 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 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