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 Manpowersection 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. --- theACCOMPLISHMENT 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

Page 1 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR 

# 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 INFORMA TION
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.

### SERVICE BULLETIN 84 ---26 ---09

S.B. 84 ---26 ---09 Page 2 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR 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).

### SERVICE BULLETIN 84 ---26 ---09

S.B. 84 ---26 ---09 Page 3 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR 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

### SERVICE BULLETIN 84 ---26 ---09

S.B. 84 ---26 ---09 Page 4 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR 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 INFORMA TION
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

### SERVICE BULLETIN 84 ---26 ---09

S.B. 84 ---26 ---09 Page 5 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR 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.

### SERVICE BULLETIN 84 ---26 ---09

S.B. 84 ---26 ---09 Page 6 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR (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.

### SERVICE BULLETIN 84 ---26 ---09

S.B. 84 ---26 ---09 Page 7 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR

### SERVICE BULLETIN 84 ---26 ---09

S.B. 84 ---26 ---09 Page 8 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR

### SERVICE BULLETIN 84 ---26 ---09

S.B. 84 ---26 ---09 Page 9 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR

### SERVICE BULLETIN 84 ---26 ---09

S.B. 84 ---26 ---09 Page 10 of 10 11 Mar 2011 Revision ‘A’ 12 May 2011 JR 

### This Page Intentionally Blank 1