Revision Revision ‘A’ 23 Sep 2014 DHC ---8 (DASH 8) SERVICE BULLETIN 8 ---24 ---88 Electrical Power --- AC Generator Mounting Plate --- Inspection and Rectification --- ModSum 8Q113009 This page transmits Revision ‘A’ of Service Bulletin 8 ---24 ---88, pages 1 thru 22, dated 23 Sep 2014. This service bulletin is re ---issued in its entirety for the reasons that follow:

-- the latest revision (Rev. 2) of Vendor SB 31708 ---50X ---24 ---01 is enclosed and the existing Vendor SB 31708 ---50X ---24 ---01 (Rev. 1) is removed --- In service part of the Effectivitysection is revised WAS: 019 thru 672 NOW: 003 thru 672 --- theCompliancesection is revised to include Transport Canada Airworthiness Directive (AD) No. CF ---2012 ---29 --- the Referencessection is revised to include Transport Canada Airworthiness Directive (AD) No. CF ---2012 ---29 and to convey the latest revision of the service bulletin and engineering documentation --- theApprovalsection is revised to include new Airworthiness Limitations (AWLs) and/or Damage Tolerance Inspection (DTIs) statement --- the Referencesection is revised to convey the latest revision of this service bulletin and engineering documentation --- theClose Outsection is updated to the latest standard. 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 the initial issue of Service Bulletin 8 ---24 ---88 and replace with attached. Previous issues of Service Bulletin 8 ---24 ---88: Initial issue --- Pages 1 thru 22 dated 13 Dec 2011

# D

S.B. 8 ---24 ---88 Page 1 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 

# SERVICE BULLETIN Customer Support
ATA SYSTEM: 2421 NUMBER: 8 ---24 ---88 

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

SUBJECT: Electrical Power --- AC Generator Mounting Plate --- Inspection and Rectification --- ModSum 8Q113009

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: DHC ---8 Aircraft Models 102, 103, 106, 201, 202, 301, 311, 314 and 315 Serial Numbers 003 thru 672. Production: None Spares Affected: Yes. Operators should check spares for existence of any AC Gen mounting adapter kits (P/N 31708 ---500/ ---501). The kits are subject to Inspection / replacement per enclosed GOODRICH vendor service bulletin (VSB) 31708 ---50X ---24 ---01.

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S.B. 8 ---24 ---88 Page 2 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 The following is a list of spares affected by this change. Review spares and procurement systems to determine the existence of any listed parts. See Paragraph 2.D., Existing Parts Accountability, for disposition.
Part Number Description 31708 ---501 AC Generator Mounting Adapter Kit 31708 ---500 AC Generator Mounting Adapter Kit
B. Reason Problem: In ---Service reports indicate that corrosion has formed around some studs on the AC Generator Mounting Adaptor p/n 31708 ---500 / & ---501. Any corrosion that may form around an AC Generator Mounting adaptor Stud(s) could cause an oil leak around AC Generator. For additional information refer to the PLANNING INFORMATIONsection in enclosed VSB 31708 ---50X ---24 ---01. Solution: This service bulletin introduces ModSum 8Q113009. The ModSum introduces new AC Generator Mounting Adaptor p/n’s 31708 ---511 and 31708 ---510 as replacement for existing p/n’s 31708 ---501 / or ---500. Visual and mechanical inspections are done to verify if the mounting adapter kit (p/n 31708 ---500 / or ---501) can continue in service or must be replaced per ModSum 8Q113009. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: --- 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 --- work stands / ladders are set ---up under the right and / or left nacelle to gain access to existing AC Generator --- the AC Generator attached to each engine is located and carefully removed

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S.B. 8 ---24 ---88 Page 3 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 --- the related AC Generator mounting adaptor is removed and cleaned --- a visual and mechanical inspection of the mounting adapter (p/n 31708 ---500 / ---501) is accomplished to determine serviceability per enclosed Goodrich VSB. Depending on results it may be necessary to replace the existing mounting adaptor with p/n 31708 ---510 / ---511 --- a serviceable or new mounting adaptor and AC generator are installed --- an operational check is done to ensure correct operation --- a leak check is done to ensure correct installation --- close out. D. Compliance Bombardier Inc. recommends incorporation of ModSum 8Q113009 at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority. Refer to the Compliance section in enclosed VSB 31708 ---50X ---24 ---01 for additional information. Transport Canada Airworthiness Directive CF ---2012 ---29 has been issued. 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). F. Manpower It will take an estimated 5 man ---hours to complete this service bulletin. The breakdown of the man ---hours is shown in the table that follows:

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S.B. 8 ---24 ---88 Page 4 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 TASK MAN ---HOURS Job Set ---Up 0.50 Procedure --- Part A Procedure --- Part B Procedure --- Part C Procedure --- Part D 0.50 1.50 0.50 1.50 Close ---Out 0.50 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 ModKit(s) required to do this service bulletin are listed in the table below: Operators should submit a purchase order through the Customer Accounts Service Team (CAST) at Bombardier Aerospace Regional Aircraft division 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 Facsimile: International: (416) 375 ---3334 European: (416) 373 ---5966 Americas East: (416) 373 ---5964 Americas West: (416) 373 ---5965 Telephone: International: (416) 375 ---3706 European: (416) 373 ---3704 Americas East: (416) 375 ---3700 Americas West: (416) 373 ---5888

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S.B. 8 ---24 ---88 Page 5 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 E ---mail addresses: International: cast.international@aero.bombardier.com European: cast.europe@aero.bombardier.com Americas East: cast.americaseast@aero.bombardier.com Americas West: cast.americaswest@aero.bombardier.com
Kit Number Description 8MK4650 ---001 (see NOTE 1 below) Retrofit Kit --- Engine Build --- AC Generator Rework 8MK4650 ---003 (see NOTE 2 below) Retrofit Kit --- Engine Build --- AC Generator Rework

NOTE 1: This kit replaces 31708 ---500. It is used on AC Generators 31708 ---000, ---000A, ---001 and ---001A.
NOTE 2: This kit replaces 31708 ---501. It is used on AC Generators 31708 ---002, ---002A, ---003 and ---003A. H. Tooling --- Price and Availability For Tooling refer to the Tooling and Material Requirements section in enclosed VSB 31708 ---50X ---24 ---01 I. Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected Modifications Manual PSM 1 ---813 ---12

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

.................... PSM 1 ---82 ---4 and PSM 1 ---83 ---4

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S.B. 8 ---24 ---88 Page 6 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 L. References Revision ‘A’ of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV 8MK4650 1

---

8Z9381 1

--- ModSum 8Q113009 Rev. ‘B’ PCA 6743 Revision 1 (for internal reference only) Transport Canada Airworthiness Directive (AD) CF ---2012 ---29 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft (1) Modification Kit 8MK4650 ---001 and ---003 (2) Detailed Kit Content:

Quantity Per Kit ---003 ---001 Part Number Description Remarks
1 31708 ---511 Mounting, Adaptor Kit 1 31708 ---510 Mounting, Adaptor Kit

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S.B. 8 ---24 ---88 Page 7 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 (3) In addition to the above part(s), the following material(s) are required for the completion of this service bulletin and may be procured as single items from Bombardier Aerospace Regional Aircraft or purchased directly from industry sources. NOTE: O ---Rings listed below are for one side only.

Part Number Qty. Per Aircraft Description Remarks AS3209 ---014 2 Packing, O ---Ring *M83248/1 ---014 AS3209 ---114 2 Packing, O ---Ring *M83248/1 ---114 AS3209 ---210 1 Packing, O ---Ring *M83248/1 ---210 AS3209 ---241 1 Packing, O ---Ring *M83248/1 ---241 * alternate part number 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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S.B. 8 ---24 ---88 Page 8 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 Existing Part Number Description Qty. IC DC New Part Number PNC 31708 ---500 AC GeneratorMounting Adaptor 1* C DIS 31708 ---510 S

31708 ---501 AC GeneratorMounting Adaptor 1* C DIS 31708 ---511 S
* One adaptor per engine (if required 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 if unserviceable 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 part number. X Reworked part and superseding part are functionally and physically equivalent but not identical.

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S.B. 8 ---24 ---88 Page 9 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 3. ACCOMPLISHMENT INSTRUCTIONS
NOTE: The rework that follows applies to AC Generators p/n 31708 ---000, ---001, ---002, ---003 and p/n 31708 ---000A, ---001A, ---002A & ---003A.
NOTE: Rework is not required if mounting adaptor kit p/n 31708 ---500 or ---501 has been previously replaced by new mounting adaptor kit p/n 31708 ---510 and/or ---511. A. Job Set ---Up (1) Placard and select all aircraft electrical power to OFF. Obey all relevant WARNINGS and CAUTIONS detailed in Maintenance Manual PSM 1 ---8 ---2, 1 ---82 ---2 or 1 ---83 ---2 Chapter 12 and 24. (2) Make sure that lock pins are installed through each main gear and main gear door mechanism. (3) Make sure the nose gear ground lock is engaged. (4) Set up the work platforms or ladders around / under the right and / or left nacelle to gain access to existing AC Generator. Make sure that the work platforms or ladders are electrically grounded. (5) Open and latch the left cowl (No.1 and / or No.2 nacelle) and locate the AC Generator.
B. Procedure PART A --- Removal of AC Generator Mounting Adaptor 31708 ---500 and/or ---501: (1) Remove the AC generator and mounting adaptor (31708 ---500 and/or ---501) from the reduction gearbox. For 100/300 series aircraft refer to applicable instructions in AMM Chapter 24 ---21 ---00 or 24 ---21 ---01 or for 200 series aircraft refer to AMM TASK 24 ---21 ---00 ---000 ---802. Keep the hardware. (a) Make sure to put a protective cover on the electrical connectors, tube assemblies and AC generator drive pad on the RGB. (b) Remove and discard O --- rings from transfer tubes, the AC generator and the generator splined shaft.

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S.B. 8 ---24 ---88 Page 10 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 (2) Clean the AC generator mounting adaptor 31708 ---500 and/or ---501. PART B --- Inspection of AC Generator Mounting Adaptor 31708 ---500 and/or---501: (1) Do a “Visual and Mechanical Inspection” of the removed AC generator mounting adaptor 31708 ---500 and/or ---501 to agree with all of the details provided in enclosed Goodrich VSB 31708 ---50X ---24 ---01. (a) If each mounting adaptor p/n 31708 ---500 and / or ---501 “passes” the inspections given in VSB 31708 ---50X ---24 ---01 then replacement is not required. Refer to PART D --- Installation (b) If each mounting adaptor p/n 31708 ---500 or ---501 “fails” any of the inspections given in the VSB then replacement with new mounting adaptor p/n 31708 ---510 and / or ---511 is required (refer to PART C below). PART C --- Rectification: (1) Discard an unserviceable AC generator mounting adaptor 31708 ---500 and/or ---501, and install a serviceable replacement (refer to PART D below). PART D --- AC Generator Mounting Adaptor Installation: (1) Install a serviceable AC generator mounting adaptor 31708 ---500 and/or ---501 or new mounting adaptor p/n 31708 ---510 and/or ---511 (ModSum 8Q113009). For 100/300 series aircraft refer to AMM Chapter 24 ---21 ---00 or 24 ---21 ---01. For 200 series aircraft refer to AMM TASK 24 ---21 ---00 ---400 ---802. (2) Do an operational test of the AC generation system. For 100/300 series aircraft refer to AMM Chapter 24 ---21 ---00 or 24 ---21 ---01. For 200 series aircraft refer to AMM TASK 24 ---21 ---00 ---710 ---801. (a) Before starting the engines make sure to remove all tools, equipment and all unwanted materials from the work area and make sure to close the left cowl (No.1 and / or No.2 nacelle). (3) Make sure to do a “leak check” to ensure correct installation of the AC Gen and mounting adaptor.

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S.B. 8 ---24 ---88 Page 11 of 22 13 Dec 2011 PM Revision ‘A’ 23 Sep 2014 C. Close Out (1) Remove all tools and equipment from the work area. (2) On incorporation of this ModSum make an entry that conforms to local regulatory requirements in the applicable logbook(s). If only part of this ModSum is completed, use only this service bulletin number as reference and detail exact limit of work completed. 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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### This Page Intentionally Blank 1Jan 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 V Job 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