Revision ‘A’ 14 Sep 2011

DHC-8 (DASH 8)

SERVICE BULLETIN 84-24-49

Electrical Power - AC Contactor Box P/N 1152090-6 Series 1, -6 Series 2

and -6 Series 4 - Galley Option No. 2 - Left Nacelle - Potential Wire

Chafing - Special Inspection / Rectification

This page transmits Revision ‘A’ of Service Bulletin 84-24-49, pages 1 thru

42 dated 14 Sep 2011.

This service bulletin is re-issued in its entirety for the reasons that follow:

- the SUBJECT block is revised to include additional part numbers 1152090-6

Series 1 and -6 Series 2

- the Effectivity section revised to include AC Contactor Box P/N 1152090-6

Series 1 and -6 Series 2

- the REASON section is revised to include AC Contactor Box P/N 1152090-6

Series 1 and Series 2

- the DESCRIPTION section is revised to introduce AC Contactor Box P/N

1152090-6 Series 1 and -6 Series 2

- the References section is revised to convey the latest revision of this and the

enclosed Honeywell SB 1152090-24-124

- the Existing Parts Accountability section is revised to include Existing and

New Part Numbers

- the ACCOMPLISHMENT INSTRUCTIONS are revised as follows:

step B. (1) is revised to include part numbers 1152090-6 Series 1 and Series

2

- step B. (4) is 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 the enclosed Honeywell SB 1152090-24-124 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 1152090-6 Series 1 and -6

Series 2 are introduced at this revision and are subject to rework

Operators who have reworked p/n 1152090-6 Series 4 using the initial issue

of this Service Bulletin are unaffected by this revision.

Remove the initial issue of Service Bulletin 84-24-49 and replace with

attached.

Previous issue(s) of Service Bulletin 84-24-49:

Initial issue - Pages 1 thru 42 dated 26 Apr 2011

D

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SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 2421 NUMBER: 84-24-49

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 1152090-6 Series 1, -6

Series 2 and -6 Series 4 - Galley Option No. 2 - Left 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 left

AC Contactor Box, Galley Option No.2, P/N 1152090-6 Series

1, -6 Series 2 and -6 Series 4.

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 is

not subject to the requirements of this SB.

Aircraft Serial Number 4374 and subsequent are fitted with post-SB configuration

ACCB’s.
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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.

Spares Affected:

None

B. Reason

Problem: Some operators of the Q400 have reported finding damaged, chaffed or

loose wiring within the left AC Contactor Box P/N 1152090-6 Series 1, -6

Series 2 and -6 Series 4.

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 Service Bulletin 1152090-24-124

(VSB).

Enclosed VSB 1152090-24-124 gives the instruction to inspect and rectify

the wiring within the left AC Contactor Box P/N 1152090-6 Series 1, -6

Series 2 and -6 Series 4 by adjusting wire routing and improving wire

protection using conduit sleeving.

For additional information refer to the “Description” section in enclosed

VSB 1152090-24-124.
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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 left nacelle to gain access to existing AC

contactor box p/n 1152090-6 Series 1, -6 Series 2 or -6 Series 4 (located next to

the main gear wheel location on the left nacelle left side)

- the contactor box is removed to agree with instructions provide 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 1152090-24-124

- the contactor box is re-identified as p/n 1152090-6 Series 5, or -6 Series 6 or -6

Series 7 (as required) then installed and tested (on wing) to agree with

instructions provided 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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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

1152090-24-124.

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:

Honeywell Service Bulletin 1152090-24-124 Revision 1 dated 31 Aug 2011

PCA 43280 Revision 0 (for internal reference only).

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

Refer to the “Material Information” section para C. in the enclosed VSB

1152090-24-124.

B. Parts Required to Modify Spares

Refer to the “Material Information” section para D. in the enclosed VSB

1152090-24-124.

C. Special Tools and Equipment Required

Refer to the “Tooling” section para F. in enclosed VSB 1152090-24-124.
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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

1152090-6 Series 4 Left AC Contactor Box1 A RWK 1152090-6 Series 5 R

1152090-6 Series 1 Left AC Contactor Box1 A RWK 1152090-6 Series 6 R

1152090-6 Series 2 Left AC Contactor Box1 A RWK 1152090-6 Series 7 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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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.

(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

left nacelle. Make sure that the workstands are electrically grounded.

B. Procedure

(1) Remove AC contactor box (p/n 1152090-6 Series 1 or -6 Series 2 or -6 Series 4

to agree with applicable instructions in AMM TASK 24-21-16-000-801. Make

sure to put a cap on all open electrical 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 1152090-24-124.

(4) Make sure that the reworked AC contactor box is re-identified (see Table 1

below) to agree with the instructions provided in VSB 1152090-24-124 section 2

(refer to applicable instructions in PSM 1-84-2 (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
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Pre-Mod Identification Post-Mod Identification

1152090-6 Series 4 1152090-6 Series 5

1152090-6 Series 1 1152090-6 Series 6

1152090-6 Series 2 1152090-6 Series 7

(5) Install AC contactor box P/N 1152090-6 Series 5 or -6 Series 6 or -6 Series 7 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 1152090-6 Series 5

or -6 Series 6 or -6 Series 7 (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 84-24-49 {AC Contactor Box P/N

1152090-6 in Left Nacelle - Potential Wire Chafing - Special Inspection /

Rectification}Accomplished.
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2
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