Revision ‘A’ 14 Sep 2011 DHC-8 (DASH 8) SERVICE BULLETIN 84-24-50 Electrical Power - AC Contactor Box P/N 1152124-6 Series 4, -6 Series 5, -6 Series 1 and -6 Series 2 - Galley Option No. 2 - Right Nacelle - Potential Wire Chafing - Special Inspection / Rectification This page transmits Revision ‘A’ of Service Bulletin 84-24-50, pages 1 thru 46 dated 14 Sep 2011. This service bulletin is re-issued in its entirety for the reasons that follow: - theSUBJECT block is revised to include AC Contactor Box P/N 1152124-6 Series 1 & -6 Series 2 - theEffectivitysection is revised to include AC Contactor Box P/N 1152124-6 Series 1 & Series 2 - the REASON section is revised to include AC Contactor Box P/N 1152124-6 Series 1 & Series 2 - theDESCRIPTIONsection is revised to introduce rework part numbers of the AC Contactor Box as P/N 1152124-6 Series 7 & Series 8 - theReferencessection is revised to convey the latest revision of this and the enclosed Honeywell SB 1152124-24-125 - the Existing Parts Accountabilitysection is revised to include Existing and New Part Numbers - theACCOMPLISHMENT INSTRUCTIONSare revised as follows: step B. (1) revised to include Series 1 & 2 step B (4) revised to include additional information and new Table 1 - step B. (5) & (6) revised to include reworked p/n’s - replaced the initial issue of enclosed Honeywell SB 1152124-24-125 with Revision 1 dated 31 Aug 2011.
The Compliance recommendation in the previous issue of this Service Bulletin is affected by this revision. Part numbers 1152124-6 Series 1 and -6 Series 2 are introduced at this revision and are subject to rework. Operators who have reworked p/n 1152124-6 Series 4 or Series 5 using the initial issue of this Service Bulletin are unaffected by this revision.Remove the initial issue of Service Bulletin 84-24-50 and replace with attached. Previous issue(s) of Service Bulletin 84-24-50: Initial issue - Pages 1 thru 42 dated 26 Apr 2011

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S.B. 84-24-50

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# SERVICE BULLETIN Customer Support
ATA SYSTEM: 2421 NUMBER: 84-24-50 

### BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Electrical Power - AC Contactor Box P/N 1152124-6 Series 4, -6 Series 5, -6 Series 1 and -6 Series 2 - Galley Option No. 2 - Right Nacelle - Potential Wire Chafing - Special Inspection / Rectification

1. PLANNING INFORMATION A. Effectivity Aircraft Affected: In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001, 4003, 4004, 4006, 4008 thru 4354 & 4356 thru 4366 with AC Contactor Box P/N 1152124-6 Series 4, -6 Series 5, -6 Series 1 and -6 Series 2 (in right nacelle). Production: A production line check has been accomplished on Aircraft Serial Numbers 4355 & 4367 thru 4373 to ensure that the existing AC Contactor Box (ACCB’s) installed on the aircraft are not subject to the requirements of this SB. Aircraft Serial Number 4374 and subsequent are fitted with post-SB configuration ACCB’s. 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,

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S.B. 84-24-50 Page 2 of 46 26 Apr 2011 LS Revision ‘A’ 14 Sep 2011 examine all STC or equivalent action changes to make sure this bulletin can be completed. Spares Affected: None B. Reason Problem: Some operators of the Q400 have reported finding damaged, chaffed or loose wiring within the right AC Contactor Box P/N 1152124-6 Series 4, -6 Series 5, -6, Series 1 and -6 Series 2. A line check at the Bombardier manufacturing facility has discovered similar issues. Damaged, chaffed or loose wiring within the AC contactor box could affect correct operation of: - associated AC generator - the windshield heater - the ice detector - the AOA vane heater - the pitot probe heater - the engine intake heater - the prop de-ice system - or possible loss of AC external power. Solution: Honeywell has prepared and issued new Service Bulletin 1152124-24-125 (VSB). The enclosed VSB gives the instruction to inspect and rectify the wiring in the right AC Contactor Box P/N 1152124-6 Series 4, -6 Series 5, -6 Series 1 and -6 Series 2 by adjusting wire routing using additional nylon cable cable tie straps and improving wire protection using conduit sleeving. For additional information refer to the “Description” section in enclosed VSB 1152124-24-125.

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S.B. 84-24-50 Page 3 of 46 26 Apr 2011 LS Revision ‘A’ 14 Sep 2011 C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: - lock pins are installed thru each main gear and main gear door mechanism - the nose gear ground lock is engaged - aircraft electrical systems are de-energized - work stands are set-up under the right nacelle to gain access to existing AC contactor box (located next to the main gear wheel location on the right nacelle left side) - the contactor box is removed to agree with instructions provided in the aircraft maintenance manual - the wiring, fasteners and related parts inside the contactor box are carefully cleaned, inspected and reworked to agree with the applicable instructions given in enclosed VSB 1152124-24-125 - the contactor box is re-identified as p/n 1152124-6 Series 6, -6 Series 7 or -6 Series 8 then installed and tested (on wing) to agree with instructions provide in the aircraft maintenance manual - all tools, equipment and unwanted materials are removed from the work area - close out. D. Compliance Bombardier Inc. highly recommends accomplishment of this service bulletin at the operators earliest opportunity unless otherwise directed by the local airworthiness authority. A Transport Canada Airworthiness Directive is Pending. 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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S.B. 84-24-50 Page 4 of 46 26 Apr 2011 LS Revision ‘A’ 14 Sep 2011 F. Manpower It will take an estimated 7.0 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 1.00 Procedure 4.00 Test / RTS 1.00 Close-Out 1.00
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 Refer to the “Material Information” section para A. in enclosed VSB 1152124-24-125. H. Tooling - Price and Availability None I. Weight and Balance None J. Electrical Load Data Not affected

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S.B. 84-24-50 Page 5 of 46 26 Apr 2011 LS Revision ‘A’ 14 Sep 2011 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: Honeywell Service Bulletin 1152124-24-125 Revision 1 dated 31 Aug 2011 PCA 43280 Revision 0 (for internal reference only) 2. MATERIALINFORMATION A. Parts Required Per Aircraft Refer to the “Material Information” section para C. in the enclosed VSB 1152124-24-125. B. Parts Required to Modify Spares Refer to the “Material Information” section para D. in the enclosed VSB 1152124-24-125. C. Special Tools and Equipment Required Refer to the “Tooling” section para F. in enclosed VSB 1152124-24-125.

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S.B. 84-24-50 Page 6 of 46 26 Apr 2011 LS Revision ‘A’ 14 Sep 2011 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 1152124-6 Series 4 Right AC Contactor Box 1 A RWK 1152124-6 Series 6 R OR 1152124-6 Series 5 Right AC Contactor Box 1 A RWK 1152124-6 Series 6 R OR 1152124-6 Series 1 Right AC Contactor Box 1 A RWK 1152124-6 Series 7 R OR 1152124-6 Series 2 Right AC Contactor Box 1 A RWK 1152124-6 Series 8 R IC Interchangeability Code A Not interchangeable. B Removed Part. No direct replacement. C Conditionally Interchangeable. Installation of superseded part negates the intent of this special inspection & rectification service bulletin. DC Disposition DIS Discard Part. MUI Multiple Usage Item: Return to stock if serviceable. RWK Inspect / 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.

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S.B. 84-24-50 Page 7 of 46 26 Apr 2011 LS Revision ‘A’ 14 Sep 2011 3. ACCOMPLISHMENTINSTRUCTIONS A. Job Set-Up (1) Placard and select all aircraft electrical power to OFF. Obey all relevant WARNINGS and CAUTIONS (refer to PSM 1-84-2 (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. (3) Make sure the nose gear ground lock is engaged. (4) Make sure that hydraulic pressure in the No.1, 2 and 3 systems are depleted (refer to AMM TASK’s 29-00-00-863-802 and 29-00-00-863-804). (5) Install a warning sign on the external hydraulic connection. (6) Position workstands as required to gain access to the AC contactor box in the right nacelle. Make sure that the workstands are electrically grounded. B. Procedure (1) Remove existing AC contactor box (p/n 1152124-6 Series 4, -6 Series 5, -6 Series 1 or -6 Series 2) to agree with applicable instructions in PSM 1-84-2 (AMM) TASK 24-21-16-000-801. Make sure to put a cap on all open connectors. NOTE: Bombardier Inc. recommends that inspection and rework be accomplished off-wing (on a bench). (2) After the cover is removed from the AC contactor box carefully clean the wiring and related parts using isopropyl alcohol solvent and a clean white wiper cloth (lint-free), (refer to applicable instructions in AMM TASK 20-30-26-910-802). (3) Inspect, rework and if necessary replace any damaged wiring and related parts within the AC contactor box to agree with all of the details provided in attached VSB 1152124-24-125.

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S.B. 84-24-50 Page 8 of 46 26 Apr 2011 LS Revision ‘A’ 14 Sep 2011 (4) Make sure that the reworked AC contactor box is re-identified (see Table 1 below) to agree with the instructions provided in VSB 1152124-24-125 section 2. Material Information para E (refer to applicable instructions in AMM TASK 20-00-01-910-801, TASK 20-00-16-400-801 and TASK 20-00-16-390-801). 

### Table 1 Pre-Mod Identification Post-Mod Identification 1152124-6 Series 4 1152124-6 Series 6 1152124-6 Series 5 1152124-6 Series 6 1152124-6 Series 1 1152124-6 Series 7 1152124-6 Series 2 1152124-6 Series 8 (5) Install AC contactor box P/N 1152124-6 Series 6, -6 Series 7 or -6 Series 8 to agree with applicable instructions in AMM TASK 24-21-16-400-801. (6) Do a “return to service” check of the AC contactor box P/N 1152124-6 Series 6, -6 Series 7 or -6 Series 8 (refer to applicable instructions in AMM TASK 24-21-16-550-801). 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 84-24-50 {AC Contactor Box P/N 1152124-6 in Right Nacelle - Potential Wire Chafing - Special Inspection / Rectification} Accomplished.

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S.B. 84-24-50 Page 46 of 46 26 Apr 2011 LS Revision ‘A’ 14 Sep 2011 2Jan 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.comFeb 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 VApproval V Manpower V Material VWeight and Balance V Electrical Load VTooling 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 VJob Set ---Up V Procedure V Close---Out VTest 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