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 INFORMATION

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 INFORMATION

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 landing 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

1
Customer 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 DOCUMENT AND THE INFORMATION IT CONTAINS WILL NOT BE COPIED OR DISCLOSED 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. Effectivity

This 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. Reason

82910012-021 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 DOCUMENT AND THE INFORMATION IT CONTAINS WILL NOT BE COPIED OR DISCLOSED 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. Description

This 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. Compliance

Inspect the lid assembly of the 82910012-021 reservoir and repair the lid assembly, if necessary.

F. Approval

This 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 correctly
Customer 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 DOCUMENT AND THE INFORMATION IT CONTAINS WILL NOT BE COPIED OR DISCLOSED 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 1
Customer 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 DOCUMENT AND THE INFORMATION IT CONTAINS WILL NOT BE COPIED OR DISCLOSED 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 DOCUMENT AND THE INFORMATION IT CONTAINS WILL NOT BE COPIED OR DISCLOSED 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 2nd

plate 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 DOCUMENT AND THE INFORMATION IT CONTAINS WILL NOT BE COPIED OR DISCLOSED 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.com
Feb 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