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 Effectivity section is revised

WAS: 019 thru 672 NOW: 003 thru 672

--- the Compliance section is revised to include Transport Canada

Airworthiness Directive (AD) No. CF ---2012 ---29

--- the References section 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

--- the Approval section is revised to include new Airworthiness Limitations

(AWLs) and/or Damage Tolerance Inspection (DTIs) statement

--- the Reference section is revised to convey the latest revision of this service

bulletin and engineering documentation

--- the Close Out section 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

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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 INFORMATION

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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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 INFORMATION section

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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--- 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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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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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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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 INFORMATION

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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(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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Existing

Part Number Description Qty. IC DC

New Part

Number PNC

31708 ---500 AC Generator

Mounting Adaptor

1* C DIS 31708 ---510 S

31708 ---501 AC Generator

Mounting 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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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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(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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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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1
Jan 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.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