# D

S.B. 84 ---29 ---34 Page 1 of 6 09 May 2013 NB 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 2921 NUMBER: 84 ---29 ---34 SUBJECT: Hydraulic Power --- Alternate Landing Gear Extension --- MLG Alternate Extension System Reservoir --- Special Inspection/Rectification

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4001 thru 4424 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 B. Reason Problem: The MLG alternate extension system reservoir assemblies P/N 82910012 ---021 manufactured by Precision Aerospace may have incorrectly installed dipstick assembly plates on the lid of the reservoir container. An incorrect installation can cause leakage that could possibly drain the reservoir below the ‘Safe’ level.

### SERVICE BULLETIN 84 ---29 ---34

S.B. 84 ---29 ---34 Page 2 of 6 09 May 2013 NB Solution: This service bulletin is issued to provide the instructions to inspect the dipstick assembly installation of reservoir assembly P/N 82910012 ---021 and to repair the lid assembly if the installation is found to be incorrect. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: --- aircraft electrical power systems are selected to OFF --- main landing gear lock pins are installed thru each main gear and main gear door mechanism --- nose landing gear lock is engaged --- work stands or ladders are set ---up --- access is gained to the MLG alternate extension system reservoir --- dipstick assembly of the MLG alternate extension system reservoir is inspected and repaired as necessary per Parker Service Bulletin 82910012 ---29 ---431. --- MLG alternate extension system reservoir is serviced --- bleeding of the alternate landing gear extension hydraulic system is done as necessary --- operational check of the landing gear alternate extension hydraulic system hand pump is done --- close out. D. Compliance Bombardier Inc. recommends that this special inspection and rectification be done at the earliest opportunity unless directed by the operator’s airworthiness authority. E. Approval The special inspection and rectification conveyed by 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).

### SERVICE BULLETIN 84 ---29 ---34

S.B. 84 ---29 ---34 Page 3 of 6 09 May 2013 NB F. Manpower It will take an estimated 3.5 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 0.50 Procedure 2.00* Test / RTS 0.50 Close ---Out 0.50 *The approximate time required to inspect the MLG alternate extension system reservoir lid assembly is 2 hours. If repair is necessary, an additional 2 hours is required. G. Material --- Price and Availability None H. Tooling --- Price and Availability None I. Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected None L. References The initial issue of this service bulletin was prepared to the related data that follows: Parker Service Bulletin 82910012 ---29 ---431 dated October 22/2012 PCA 44413 Revision 1 (for internal reference only).

### SERVICE BULLETIN 84 ---29 ---34

S.B. 84 ---29 ---34 Page 4 of 6 09 May 2013 NB 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft Refer to MATERIAL INFORMATION section of Parker Service Bulletin 82910012 ---29 ---431. B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None D. Existing Parts Accountability None
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 24 ---00 ---00 ---861 ---802 and TASK 24 ---00 ---00 ---910 ---801). (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 and lock pins are installed thru the door mechanism. (4) Set wheel chocks in front and behind the landing gear tires. (5) Place workstand or ladder under the the aircraft nose area to gain access to the forward equipment compartment (refer to Figure 1 for location). Make sure that the work platforms or ladders are electrically grounded.

### SERVICE BULLETIN 84 ---29 ---34

S.B. 84 ---29 ---34 Page 5 of 6 09 May 2013 NB (6) Open the forward equipment access panel 112AR (refer to AMM TASK 06 ---41 ---00 ---992 ---801 for location).
B. Procedure (1) Remove the dipstick from the MLG alternate extension system reservoir, and note the fluid level (refer to Figure 1). (2) Do the inspection and necessary repair of the dipstick assembly of the MLG alternate extension system reservoir assembly to agree with the instructions in attached Parker Service Bulletin 82910012 ---29 ---431. (3) Make sure to ink stamp and clear coat “SB ---29 ---431” on the reservoir to agree with the instructions in attached Parker Service Bulletin 82910012 ---29 ---431.
C. Close Out (1) Make sure the MLG alternate extension system reservoir is serviced as necessary (refer to applicable instructions in AMM TASK 12 ---10 ---29 ---611 ---803). (2) If the hydraulic tubes were disconnected during accomplishment of this service bulletin or if the fluid level noted in B.(1) was below the safe indication on the dipstick, bleed the alternate landing gear extension hydraulic system (refer to applicable instructions in AMM TASK 29 ---21 ---00 ---870 ---801). (3) Do the operational check of the landi ng gear alternate extension hydraulic system hand pump (refer to appicable instructions in AMM TASK 29 ---21 ---00 ---710 ---802). (4) Remove all tools and equipment from the work area. (5) Close the forward equipment access panel 112AR (refer to AMM TASK 06 ---41 ---00 ---992 ---801 for location). (6) On completion of this service bulletin, make the following entry in the appropriate logbooks: “Service Bulletin 84 ---29 ---34 (Hydraulic Power --- Alternate Landing Gear Extension --- MLG Alternate Extension System Reservoir --- Special Inspection/Rectification) accomplished.”

### SERVICE BULLETIN 84 ---29 ---34

S.B. 84 ---29 ---34 Page 6 of 6 09 May 2013 NB A A

MLG Alternate Extension System Reservoir Figure 1 1Customer Support Inc. 

# SERVICE BULLETIN

Initial Issue: October 22/2012 

# 82910012-29-431 Page 1 of 6 THIS DOCUMENT CONTAINS INFORMATION THAT IS CONFIDENTIAL AND PROPRIETARY TO PARKER-HANNIFIN CORPORATION. THIS DOCUMENT IS FURNISHED ON THE UNDERSTANDING THAT THE DO CUMENT AND THE INFORMATION IT CONTAINS WI LL NOT BE COPIED OR DI SCLOSED TO OTHERS EXCEPT WITH THE WRITTEN CONSENT OF PARKER, WILL NOT BE USED FOR ANY PURPOSE OTHER THAN CONDUCTING BUSINESS WITH PARKER, AND WILL BE RETURNED AND ALL FURTHER USE DISCONTINUED UPON REQUEST BY PARKER. COPYRIGHT PARKER. YEAR OF COPYRIGHT IS FIRST YEAR INDICATED ON THIS DOCUMENT. ALL RIGHTS RESERVED.

ATA CHAPTER TITLE KEY WORD/COMPONENT BRIEF STATEMENT OF WORK INVOLVED 29 - Hydraulic Power Reservoir, Assembly Of Inspect lid assembly and repair if necessary

1. PLANNING INFORMATION A. EffectivityThis Service Bulletin is applicable to Precision Aerospace manufactured Reservoir Assembly part number 82910012-021. These reservoirs are installed in Bombardier Dash-8 Q400 aircraft, and must be inspected on aircraft with serial numbers 4001 – 4424. B. Concurrent Requirements Not applicable. C. Reason82910012-021 reservoir assemblies manufactured by Precision Aerospace may have incorrectly installed dipstick assembly plates on the lid of the reservoir container. An incorrect installation can cause external leakage that could possibly drain the reservoir below the ‘Safe’ level. The dipstick assembly installation on these 82910012-021 reservoir assemblies must be inspected and the lid assembly must be repaired if the installation is incorrect.Customer Support Inc. 

# SERVICE BULLETIN

Initial Issue: October 22/2012 

# 82910012-29-431 Page 2 of 6 THIS DOCUMENT CONTAINS INFORMATION THAT IS CONFIDENTIAL AND PROPRIETARY TO PARKER-HANNIFIN CORPORATION. THIS DOCUMENT IS FURNISHED ON THE UNDERSTANDING THAT THE DO CUMENT AND THE INFORMATION IT CONTAINS WI LL NOT BE COPIED OR DI SCLOSED TO OTHERS EXCEPT WITH THE WRITTEN CONSENT OF PARKER, WILL NOT BE USED FOR ANY PURPOSE OTHER THAN CONDUCTING BUSINESS WITH PARKER, AND WILL BE RETURNED AND ALL FURTHER USE DISCONTINUED UPON REQUEST BY PARKER. COPYRIGHT PARKER. YEAR OF COPYRIGHT IS FIRST YEAR INDICATED ON THIS DOCUMENT. ALL RIGHTS RESERVED. D. DescriptionThis service bulletin provides instructions to inspect and repair (if necessary) the installation of the lid assembly dip-stick plates.

Figure 1 – Reservoir lid assembly E. ComplianceInspect the lid assembly of the 82910012-021 reservoir and repair the lid assembly, if necessary. F. ApprovalThis Service Bulletin contains no modification information that revises the approved configuration and therefore does not require governmental or other regulatory agency approval. G. Manpower The approximate time required to inspect the reservoir lid assembly is 2 hours. If repair is necessary, an additional 2 hours is required. Dip-stick plates, assembled correctlyCustomer Support Inc. 

# SERVICE BULLETIN

Initial Issue: October 22/2012 

# 82910012-29-431 Page 3 of 6 THIS DOCUMENT CONTAINS INFORMATION THAT IS CONFIDENTIAL AND PROPRIETARY TO PARKER-HANNIFIN CORPORATION. THIS DOCUMENT IS FURNISHED ON THE UNDERSTANDING THAT THE DO CUMENT AND THE INFORMATION IT CONTAINS WI LL NOT BE COPIED OR DI SCLOSED TO OTHERS EXCEPT WITH THE WRITTEN CONSENT OF PARKER, WILL NOT BE USED FOR ANY PURPOSE OTHER THAN CONDUCTING BUSINESS WITH PARKER, AND WILL BE RETURNED AND ALL FURTHER USE DISCONTINUED UPON REQUEST BY PARKER. COPYRIGHT PARKER. YEAR OF COPYRIGHT IS FIRST YEAR INDICATED ON THIS DOCUMENT. ALL RIGHTS RESERVED. H. Weight and Balance Not applicable. I. Electrical Load Data Not changed. J. Software Accomplishment Summary Not applicable. K. References Not applicable. L. Other Publications Affected Not applicable. M. Interchangeability or Intermixability of Parts Not applicable. 2. MATERIAL INFORMATION A. Material Price and Availability (1) The materials required for the repair are shown in table 1. Table 1 – Repair Materials NEW P/N KEYWORD QTY MS20470A5 Rivets 2 NAS1611-016 Packing 1Customer Support Inc. 

# SERVICE BULLETIN

Initial Issue: October 22/2012 

# 82910012-29-431 Page 4 of 6 THIS DOCUMENT CONTAINS INFORMATION THAT IS CONFIDENTIAL AND PROPRIETARY TO PARKER-HANNIFIN CORPORATION. THIS DOCUMENT IS FURNISHED ON THE UNDERSTANDING THAT THE DO CUMENT AND THE INFORMATION IT CONTAINS WI LL NOT BE COPIED OR DI SCLOSED TO OTHERS EXCEPT WITH THE WRITTEN CONSENT OF PARKER, WILL NOT BE USED FOR ANY PURPOSE OTHER THAN CONDUCTING BUSINESS WITH PARKER, AND WILL BE RETURNED AND ALL FURTHER USE DISCONTINUED UPON REQUEST BY PARKER. COPYRIGHT PARKER. YEAR OF COPYRIGHT IS FIRST YEAR INDICATED ON THIS DOCUMENT. ALL RIGHTS RESERVED. B. Industry Support Information The necessary parts are to industry standards and are locally available. C. Tooling - Price and Availability Not applicable.

3. ACCOMPLISHMENT INSTRUCTIONS
A. Procedure 1) Inspect the reservoir assembly for a possibly defective dip-stick assembly as follows: (a) Be sure there are two plates stacked up at the rivet assembly for the dipstick as shown in Figure 2.

Figure 2 – Two Plates

(b) If there are two plates as shown in Figure 2, inspect to make sure there is not a gap between the riveted plates and the lid cover that could let fluid leak around the plate, as shown in Figure 3. 2 Plates (shown correctly)Customer Support Inc. 

# SERVICE BULLETIN

Initial Issue: October 22/2012 

# 82910012-29-431 Page 5 of 6 THIS DOCUMENT CONTAINS INFORMATION THAT IS CONFIDENTIAL AND PROPRIETARY TO PARKER-HANNIFIN CORPORATION. THIS DOCUMENT IS FURNISHED ON THE UNDERSTANDING THAT THE DO CUMENT AND THE INFORMATION IT CONTAINS WI LL NOT BE COPIED OR DI SCLOSED TO OTHERS EXCEPT WITH THE WRITTEN CONSENT OF PARKER, WILL NOT BE USED FOR ANY PURPOSE OTHER THAN CONDUCTING BUSINESS WITH PARKER, AND WILL BE RETURNED AND ALL FURTHER USE DISCONTINUED UPON REQUEST BY PARKER. COPYRIGHT PARKER. YEAR OF COPYRIGHT IS FIRST YEAR INDICATED ON THIS DOCUMENT. ALL RIGHTS RESERVED. Figure 3 – Gap in Assembly 2) If the dip-stick subassembly installation is correct, ink stamp and clear coat “SB-29- 431” on the reservoir in the location shown in Figure 5 to show the inspection has been done. No repair is necessary. 3) If the dipstick subassembly fails step 1 (a) or (b), the lid assembly must be repaired as described below. NOTE – if there is only 1 plate visible upon inspection, the 2 ndplate is incorrectly installed underneath the lid and is not visible until the lid is removed. (a) Remove Reservoir Assembly per AMM task 29-21-11-000-801 (b) Remove the lid and remove the 2x rivets in the lid-assembly. (c) Install the two plates (packers), NAS1611-016 packing, and rivets as shown in Figure 4. NOTE – the top plate is welded to the tube assembly.Customer Support Inc. 

# SERVICE BULLETIN

Initial Issue: October 22/2012 

# 82910012-29-431 Page 6 of 6 THIS DOCUMENT CONTAINS INFORMATION THAT IS CONFIDENTIAL AND PROPRIETARY TO PARKER-HANNIFIN CORPORATION. THIS DOCUMENT IS FURNISHED ON THE UNDERSTANDING THAT THE DO CUMENT AND THE INFORMATION IT CONTAINS WI LL NOT BE COPIED OR DI SCLOSED TO OTHERS EXCEPT WITH THE WRITTEN CONSENT OF PARKER, WILL NOT BE USED FOR ANY PURPOSE OTHER THAN CONDUCTING BUSINESS WITH PARKER, AND WILL BE RETURNED AND ALL FURTHER USE DISCONTINUED UPON REQUEST BY PARKER. COPYRIGHT PARKER. YEAR OF COPYRIGHT IS FIRST YEAR INDICATED ON THIS DOCUMENT. ALL RIGHTS RESERVED. Figure 4 – Dipstick Installation (d) Ensure lid assembly is clean and re-install the lid assembly onto the reservoir. (e) Install Reservoir Assembly per AMM task 29-21-11-400-801 (f) Service per AMM task 12-10-29-611-803 4) Ink stamp and clear coat SB-29-431 on the reservoir in the location shown in Figure 5.5) Clean all hydraulic fluid leakage and remove all tools, equipment and unwanted material from the work area.

Figure 5 – SB Marking on Reservoir SB-29-431 82910032-101 Packer (ref.) 82910013 Lid (ref.)

82910023-003 Tube Assy (ref.) NAS1611-016 Packing (ref.)Jan 2009 

### SERVICE BULLETIN (SB) --- RECORD OF INCORPORATION --- Q SERIES DASH 8 AIRCRAFT To: CMDB Focal 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