D

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08 Jul 2009

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SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 3234 NUMBER: 84 ---32 ---67

SUBJECT: Landing Gear --- Alternate Extension --- MLG Emergency Cables ---

Replacement Of Clevis Ends --- Special Inspection and Rectification ---

ModSum 4 ---109922

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4001,

4003, 4004, 4006, 4008 thru 4109.

Production: ModSum 4 ---109922 will be installed before delivery on

applicable DHC ---8 Aircraft at Serial Number 4110 and

subsequent.

Spares Affected:

None

B. Reason

Problem: Aircraft may have been delivered to an operator with an incorrect clevis

installed.

The clevis that attaches the MLG alternate release cable to the alternate

release lever has been identified as an incorrect part (MS21252 ---3RL or

MS21252 ---3LL) in lieu of the proper part (Goodrich 48508 ---1). The

clevis is supposed to fit within the clevis end (Goodrich 48505) of Spring

Box (Goodrich 4805), but is physically too large to fit properly and is

thus fitted incorrectly.

The installation of this incorrect part would also require a different length

clevis pin (correct pin p/n MS20392 ---2C15) to be installed.
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In addition, the incorrect clevis is 0.5 inches shorter than the correct

Goodrich clevis resulting in minimal thread engagement with the

turnbuckle.

Solution: Do a special inspection of the clevis (right hand nacelle only) that

attaches the MLG alternate release cable to the alternate release lever.

If an incorrect clevis is found, remove the incorrect part and install the

Goodrich 48508 ---1 clevis. In addition, the existing clevis pin will be

changed to the correct MS20392 ---2C15 pin.

The clevis in the left hand nacelle is not affected by this modification.

C. Description

The procedures in this service bulletin give the instructions to do the tasks that

follow:

--- access is gained to the MLG alternate release cable located in the right hand

nacelle

--- the clevis that attaches the MLG alternate release cable to the alternate release

lever is inspected to make sure it is the correct clevis and hardware stack

--- if found incorrect the clevis and clevis pin is removed and replaced with the

correct clevis and clevis pin

--- if required an operation test of the MLG alternate release system is done

--- close out.

D. Compliance

Bombardier Inc. recommends incorporation of ModSum 4 ---109922 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.
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F. Manpower

PART A --- Special Inspection

It will take an estimated 1.00 man ---hours to complete the Special Inspection

portion of the ACCOMPLISHMENT INSTRUCTIONS in this service bulletin. The

breakdown of man ---hours is shown in the table that follows:

TASK MAN ---HOURS

Job Set ---Up 0.50

Procedure in Part A 0.50

Test / RTS N/A

Close ---Out 0.50

PART B --- Rectification

It will take an estimated additional 2.50 man ---hours to complete the Rectification

portion of the ACCOMPLISHMENT INSTRUCTIONS in this service bulletin. The

breakdown of man ---hours is shown in the table that follows:

TASK MAN ---HOURS

Job Set ---Up 0.50

Procedure in Part B 1.00

Test / RTS 0.50

Close ---Out 0.50

G. Material --- Price and Availability

The parts detailed in Paragraph 2. A. may be obtained from any Bombardier

Aerospace Regional Aircraft authorized parts source. The price and availability will

be quoted at the time of order.

H. Tooling --- Price and Availability

None

I. Weight and Balance

None

J. Electrical Load Data

Not affected

K. Publications Affected

ModSums Manual PSM 1 ---84 ---12 ..................................
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L. References

The initial issue of this service bulletin was prepared to the engineering drawings

and related data that follows:

ModSum 4Q109922 Rev. ‘B’

ModSum 4 ---109922 Rev. ‘B’

PCA 42647 Revision 0 (for internal reference only)

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

(1) Detailed Parts List:

Quantity

Per Aircraft

Part Number Description Remarks

1 48508 ---1 Clevis

1 MS20392 ---2C15 Clevis Pin

1 NAS1149D0316H Flat Washer

1 MS24665 ---153 Split Cotter Pin

B. Parts Required to Modify Spares

None

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.
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Existing

Part Number Description Qty. IC DC

New Part

Number PNC

MS21252 ---3RL N

or Clevis 1 A SAL 48508 ---1 N

MS21252 ---3LL N

--- Clevis Pin 1 A SAL MS20392 ---2C15 N

--- Flat Washer 1 A DIS NAS1149D0316H N

--- Split Cotter Pin 1 A DIS MS24665 ---153 N

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.

MUI Multiple Usage Item: Return to stock if serviceable.

RWK Rework existing part in accordance with this service bulletin.

RWI Rework existing part per .....

SAL Salvage. Return to operator’s stores for salvage consideration.

PNC Part Number Code

N New part.

R Part number after rework.

S Superseding or equivalent part number.

X Reworked part and superseding part are functionally and physically

equivalent but not identical.
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3. ACCOMPLISHMENT INSTRUCTIONS

A. Job Set ---Up

(1) Put the aircraft into standard configuration for maintenance (refer to Aircraft

Maintenance Manual (AMM) PSM 1 ---84 ---2 TASK 12 ---00 ---01 ---860 ---801).

(2) Put the aircraft on jacks (refer to AMM TASK 07 ---10 ---00 ---582 ---801).

B. Procedure

Part A --- Special Inspection

WARNING: MAKE SURE THAT THE LANDING GEAR DOORS ARE OPENED AND

LOCKED. MAKE SURE THAT LOCKPINS ARE INSTALLED THRU THE

MLG AND THAT THE NOSE GEAR LOCK IS ENGAGED. THE LANDING

GEAR DOORS AND THE LANDING GEAR CAN ACCIDENTALLY

RETRACT. THIS COULD CAUSE INJURIES TO PERSONS AND

DAMAGE TO THE EQUIPMENT.

(1) Gain access to the MLG alternate release cable located in the right hand nacelle.

(2) Refer to Figure 1, Figure 2 and Figure 3 and visually inspect the clevis location

of the MLG alternate extension system ---cam mechanism assembly for the

correct clevis, clevis pin and hardware build ---up.

(3) If the clevis and hardware buildup is correct, go to step (2) of the Close Out

section and complete this service bulletin (84 ---32 ---67).

(4) If the clevis and hardware buildup are incorrect, go to Part B --- Rectification

and replace the existing clevis, clevis pin, washer and cotter pin with the correct

parts.

Part B --- Rectification

(1) Remove existing cotter pin, washer and clevis pin from existing clevis (refer to

Figure 3). Discard the washer and cotter pin.

(2) Remove and discard existing clevis.

(3) Install new clevis 48508 ---1, new clevis pin MS20392 ---2C15, new washer

NAS1149D0316H and new split cotter pin MS24665 ---153 (refer to Figure 3

SECTION S ---S).

(4) Do the rigging of the alternate extension MLG cables using applicable

instructions in AMM 32 ---34 ---16 ---830 ---802.
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C. Close Out

(1) If the clevis, clevis pin, washer and split cotter pin have been replaced, do an

operational test of the MLG alternate extension system (refer to AMM TASK

32 ---34 ---00 ---710 ---801).

(2) Lower the aircraft and remove the jacks, (refer to AMM TASK

07 ---10 ---00 ---582 ---801).

(3) Remove all tools and equipment from the work area.

(4) On completion of this service bulletin, make the following entry in the

appropriate logbooks: “Service Bulletin 84 ---32 ---67 {Alternate Extension ---

MLG Emergency Cables --- Replacement Of Clevis Ends --- Special Inspection

and Rectification} accomplished.”
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Clevis Location --- Right Hand Nacelle Only

Figure 1

3

1

2

4

LEGEND

TO

UPLOCK

ASSY

brx17a01.dg, sm/ik, 01/12/00

CLEVIS

LOCATION

1. Turnbuckle

2. Lever

3. Cam mechanism

4. Roller

5. Spring Box

6. Turnbuckle

5

6
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Incorrect Clevis Installation

Figure 2

NOTE: REFER TO SECTION S ---S

IN FIGURE 3 FOR CORRECT

HARDWARE STACK
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Correct Clevis Hardware Stack and Assembly --- Right Hand Nacelle Only

Figure 3

48508 ---1

CLEVIS

48508 ---1

CLEVIS

1 1
Jan 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:

cmbd.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