Revision ‘A’ 12 May 2011

DHC ---8 (DASH 8)

SERVICE BULLETIN 84 ---26 ---09

Fire Protection --- Fire Detection --- Replacement of Fire/Overheat

Detector P/N 10 ---1097 or 10 ---1097 ---01 with 10 ---1097 ---02 --- Main

Landing Gear Primary Zone --- ModSum 4 ---113699

This page transmits Revision ‘A’ of Service Bulletin 84 ---26 ---09, pages 1 thru

10 dated: 12 May 2011.

This service bulletin is re ---issued in its entirety with the changes that follow:

--- the Description section is revised to add additional items to be removed

--- the Manpower section is revised to add additional hours and a Note

--- the References section is revised to convey the latest issue of the service

bulletin and to update engineering documents.

--- the ACCOMPLISHMENT INSTRUCTIONS section is revised to add

additional steps for the removal of items

The Compliance in the previous issue of this service bulletin is not affected

by this revision. No additional rework to the aircraft is introduced by this

revision.

Remove previous issue of Service Bulletin 84 ---26 ---09 and replace with

attached.

Previous issue of Service Bulletin 84 ---26 ---09:

Initial issue --- Pages 1 thru 10 dated 11 Mar 2011
D

S.B. 84 ---26 ---09

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SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 2620 NUMBER: 84 ---26 ---09

BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS

SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND

URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Fire Protection --- Fire Detection --- Replacement of Fire/Overheat

Detector P/N 10 ---1097 or 10 ---1097 ---01 with 10 ---1097 ---02 --- Main

Landing Gear Primary Zone --- ModSum 4 ---113699

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

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

thru 4373.

Production: ModSum 4 ---113699 will be installed before delivery on

applicable DHC ---8 Aircraft at Serial Number 4374 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.
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Spares Affected:

Part Number Description

10 ---1097 or 10 ---1097 ---01 Fire/Overheat Detector

B. Reason

Kidde Aerospace and Defense has modified the Fire/Overheat Detector (APD ---

Advance Pneumatic Detector) internal design to eliminate false fire indication after

fire has been extinguished.

C. Description

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

follow:

--- aircraft is put into standard configuration for maintenance

--- 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

--- aft upper mid cowl is removed

--- aft upper cowl is removed

--- existing Fire/Overheat Detector P/N 10 ---1097 or 10 ---1097 ---01 on both MLG

primary zone is replaced

--- an operational test of the nacelle fire detection system is done

--- close out.

D. Compliance

Bombardier Inc. recommends incorporation of ModSum 4 ---113699 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 34 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/Gain Access 12.00 see note below

Procedure 10.00

Test / RTS 1.00

Close ---Out 11.00

NOTE: The amount of man ---hours required to do this service bulletin will be

greatly reduced if the exhaust has been removed.

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

The part 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.

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

H. Tooling --- Price and Availability

None

I. Weight and Balance

None

J. Electrical Load Data

Not affected
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K. Publications Affected

Dash 8 Illustrated Parts Catalogue PSM 1 ---84 ---4 ....................

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

L. References

Revision ‘A’ of this service bulletin was prepared to the engineering drawings and

related data that follows:

ModSum 4Q113699 Rev. ‘A’

ModSum 4 ---113699 Rev. ‘A’

ModSum 4K113699 Rev. ‘A’

PCA 42588 Revision 0 (for internal reference only)

Transport Canada Airworthiness Directive Pending

Kidde Aerospace Service Bulletin 10 ---1097 ---26 ---484 dated: Jan 26/11

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

Quantity

Per Aircraft

Part Number Description Remarks

2 10 ---1097 ---02 Fire/Overheat Detector

B. Parts Required to Modify Spares

None

C. Special Tools and Equipment Required

None
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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

10 ---1097 or

10 ---1097 ---01

Fire/Overheat

Detector

2 B DIS 10 ---1097 ---02 S

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 No equivalent Bombardier Inc. part number for reworked part. Indicate

on part that this service bulletin has been accomplished.

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.

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).

(2) Make sure that lock pins are installed thru each main gear and main gear door

mechanism.
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(3) Make sure the nose gear ground lock is engaged.

(4) Set up work platforms or ladders as required to gain access to left and right

engines. Make sure the work platforms or ladders are electrically grounded.

(5) Remove aft upper mid cowl. Refer to Maintenance Manual Task

54 ---32 ---11 ---000 ---801.

(6) Remove aft upper cowl. Refer to Maintenance Manual Task

54 ---32 ---01 ---000 ---801.

B. Procedure

(1) Remove existing left and right main landing gear primary zone advance

pneumatic detector (Fire/Overheat Detector P/N 10 ---1097 or 10 ---1097 ---01).

Refer to Maintenance Manual Task 26 ---11 ---06 ---000 ---801 and enclosed Kidde

Aerospace Service Bulletin 10 ---1098 ---26 ---485.

(2) Install on the left and right main landing gear primary zone advance pneumatic

detector (Fire/Overheat Detector P/N 10 ---1097 ---02). Refer to Maintenance

Manual Task 26 ---11 ---06 ---400 ---801 and enclosed Kidde Aerospace Service

Bulletin 10 ---1097 ---26 ---484.

C. Close Out

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

(2) Install aft upper cowl. Refer to Maintenance Manual Task 54 ---32 ---01 ---400 ---801.

(3) Install aft upper mid cowl. Refer to Maintenance Manual Task

54 ---32 ---11 ---400 ---801.

(4) On incorporation of this ModSum, make an entry that conforms to local

regulatory requirements in the applicable logbook(s). Enter component serial

numbers if applicable. Enter this ModSum number only after complete and

functional incorporation of all work defined in this service bulletin.
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