D

S.B. 84 ---32 ---75

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SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 3221 NUMBER: 84 ---32 ---75

BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS

SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND

URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Landing Gear --- Nose Landing Gear Mechanism --- Linkage Assembly ---

Special Inspection and Rectification --- ModSum 4 ---113675

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4006,

4008, 4012 thru 4015, 4018 thru 4023, 4073 thru 4197.

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
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B. Reason

Problem: A number of spare non ---conforming pushrods (used in the NLG door

mechanism) were supplied to Goodrich and were installed on some

aircraft.

Solution: Do a part number inspection of the left hand side pushrod. If the part

number matches one of the 34 suspect lot numbers the operator should

order the replacement modkit and replace the pushrod.

C. Description

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

follow:

--- aircraft electrical power is removed

--- main landing gear lock pins are installed thru each main gear and main gear

door mechanism

--- the NLG ground lock is engaged

--- the lot number of the left hand side pushrod for the NLG door mechanism is

inspected and recorded

--- if the lot number matches one of the 34 suspect lot numbers the pushrod is replaced

with a nonsuspect pushrod. An operational check of the NLG doors is done after

the pushrod replacement

--- close out.

D. Compliance

Bombardier Inc. recommends incorporation of Service Bulletin 84 ---32 ---75 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.

This Service Bulletin does not affect Airworthiness Limitations (AWLs) or Damage

Tolerance Inspections (DTIs).
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F. Manpower

It will take an estimated 1.25 man ---hours to complete the Special Inspecton

section of 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 0.25

Test / RTS N/A

Close ---Out

(if Rectification

not required)

0.50

In addition, it will take an estimated 6.00 man ---hours to complete the Rectification

section of 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 4.00

Test / RTS 1.00

Close ---Out 0.50

G. Material --- Price and Availability

If required, ModKit 8MK4279 ---001 is available through the Customer Accounts

Service Team at Bombardier Aerospace Regional Aircraft division. Operators

should submit a purchase order specifying aircraft serial number(s) to:

Bombardier Aerospace

Customer Accounts Services Team (Mail Stop N11 ---32)

123 Garratt Blvd.

Toronto

Ontario

Canada M3K ---1Y5

Facsimile: (416) 375 ---3060

Telephone : (416) 375 ---3920
SERVICE BULLETIN 84 ---32 ---75

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Kit Number Description

8MK4279 ---001 Retrofit Kit --- Push Rod Assembly Replacement --- NLG

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 ---84 ---4 ....................

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

L. References

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

and related data that follows:

DRAWING SHEET REV

8MK4279 1 B

ModSum 4Q113675 Rev. ‘A’

ModSum 4 ---113675 Rev. ‘A’

PCA 40535 Revision 2 (for internal reference only)

Transport Canada Airworthiness Directive Pending

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

(1) Modification Kit 8MK4279 ---001, Retrofit Kit --- Push Rod Assembly

Replacement --- NLG
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(2) Detailed Kit Content:

Quantity Per Kit

---001

Part Number Description Remarks

1 83232012 ---951 Pushrod ---NLG

2 MS24665 ---153 Cotter Pin

4 AN960 ---516 Washer

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.

Existing

Part Number Description Qty. IC DC

New Part

Number PNC

83232012 ---001 Pushrod ---NLG 1 C DES 83232012 ---951 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

DES Destroy 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.
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PNC Part Number Code

N New part.

R Part number after rework.

S Superseding or equivalent part number.

X Existing part and new 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. 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.

WARNING: MAKE SURE THAT THE LOCKPINS ARE INSTALLED IN THE MAIN

LANDING GEAR. MAKE SURE THE NOSE GEAR LOCK IS ENGAGED.

IF THIS IS NOT DONE, THE LANDING GEAR CAN ACCIDENTALLY

RETRACT. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE

TO THE 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.

(3) Make sure the NLG ground lock is engaged.

B. Procedure

Special Inspection

(1) Refer to Figure 1 and gain access to the NLG door linkage.

NOTE: The lot numbers identified below, are identified by ink stamp on the bell

crank assembly and is also recorded on the C of C shipped with the unit.

This lot number is the GLC work order number, identified with the

WO prefix.
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(2) Inspect the lot number of the pushrod and compare it with the lot numbers in

table below. If the lot number matches with any in the table, go to the

Rectification section and replace the pushrod. If the lot number does not match

with any in the table, go to the Close Out section and complete the service

bulletin.

ASSEMBLY PART

NUMBER

LOT NUMBER

83232012 ---001 50989, 50990, 52770, 54671, 54672,

56907, 56908, 56909, 56910, 59187,

59188, 62108, 62109, 62110, 62111,

62112, 62113, 62114, 64192, 64193,

65788, 69856, 74759, 74760, 74761,

74762, 77155, 77156, 79516, 79517,

79518, 79519, 86489, 86490

Rectification

(3) Refer to Figure 2 and applicable steps in AMM TASK 32 ---22 ---16 ---000 ---801 and

remove push rod 83232012 ---001 from aft left nose landing gear door. Destroy

the pushrod.

(4) Refer to applicable steps in AMM TASK 32 ---22 ---16 ---400 ---801 and install new

push rod 83232012 ---951.

(5) Refer AMM TASK 32 ---31 ---00 ---710 ---801 and do the operational test of the

landing gear primary extension and retraction system

C. Close Out

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

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

appropriate logbooks: “Service Bulletin 84 ---32 ---75 {Landing Gear --- Nose

Landing Gear Mechanism --- Linkage Assembly --- Special Inspection and

rectification} accomplished.”
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Location of NLG Mechanism

Figure 1
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NLG Mechanism --- View Looking Aft

Figure 2

PUSHROD

83232012 ---951

QTY: 1

WAS

PUSHROD

83232012 ---001

QTY: 1

COTTER PIN

MS24665 ---153

QTY: 1

WASHER

AN960 ---516

QTY:2

BOLT

NAS1105 ---12D REF.

BUSHING

NAS75 ---5 ---006 REF.

NUT

MS14145L5 REF.

COTTER PIN

MS24665 ---153

QTY: 1

WASHER

AN960 ---516

QTY:2

BOLT

NAS1105 ---12D REF.

BUSHING

NAS75 ---5 ---006 REF.

NUT

MS14145L5 REF.

BELLCRANK REF.
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This Page Intentionally Blank

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:

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