Revision ‘B’ 02 Jan 2014

DHC-8 (DASH 8)

SERVICE BULLETIN 84-36-04

Pneumatics - Ice & Rain Protection and Bleed Air System - Segregation

of HPSOV Power Supply from TMU - ModSum 4-110595

This page transmits Revision ‘B’ of Service Bulletin 84-36-04, pages 1 thru

20, dated: 02 Jan 2014.

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

- The PLANNING INFORMATION D. Compliance section is revised to add

Transport Canada Airworthiness Directive CF-2013-27

- The References section is revised to convey the latest revision of the

service bulletin and engineering documentation

- The ACCOMPLISHMENT INSTRUCTIONS section is revised to correct

Wiring Diagram Figure 8 connector pin on 9811-P421 was N now N-. Added

to Figure 1 thru Figure 7 the title Segregation of HPSOV Power Circuit From

TMU

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 previous issue of this Service Bulletin 84-36-04 and replace with

attached.

Previous issues of Service Bulletin 84-36-04:

Initial issue - Pages 1 thru 20 dated 13 Mar 2013

D

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SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 3600 NUMBER: 84-36-04

BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS

SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND

URGE OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Pneumatics - Ice & Rain Protection and Bleed Air System - Segregation

of HPSOV Power Supply from TMU - ModSum 4-110595

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

In-Service: DHC-8 Aircraft Models 401 and 402 Serial Numbers 4001,

4003 thru 4446.

Production: ModSum 4-110595 will be installed before delivery on

applicable DHC-8 Aircraft at Serial Number 4447 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.

Spares Affected:

None
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B. Reason

Problem: The TMU (Timer and Monitor Unit) and HPSOV (High Pressure Shut-off

Valve) are currently on the same 1 amp circuit breaker and because the

TMU is a class one installation it should have a separate power source than

any other component. In addition the HPSOV is critical to provide sufficient

de-ice pressure to the system. When the circuit breaker pops there are

numerous caution lights appearing and operators have to exit icing

conditions.

Solution: This service bulletin provides instructions to segregate the power source

for the TMU via a wiring change.

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

- access panels are opened

- some wires are reterminated and new wires are added

- a return to service procedure is done

- close out.

D. Compliance

Bombardier Inc. recommends incorporation of ModSum 4-110595 at the earliest

opportunity unless otherwise directed by the operator’s airworthiness authority.

Transport Canada Airworthiness Directive CF-2013-27.

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 9 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 6.00

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

The parts detailed in Paragraph 2.A. may be either furnished or fabricated from the

operator’s existing stock, purchased as single items from Bombardier Aerospace

Regional Aircraft or purchased directly from industry sources.

H. Tooling - Price and Availability

None

I. Weight and Balance

A/C Type and

Model

Weight (Lb) Arm (Inches)

Moment

(Inches x Lb)

x 0.001

DHC-8 Model

401/402 KIT -

8DK4224-001

+0.43 103.18 +0.04
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J. Electrical Load Data

1. Direct Current Loads

Applicability Amperes Bus

ECS/BA Cont

R Auto

see Type of Load Data Change

below

R Main DC

ECS/BA Cont

L Auto

see Type of Load Data Change

below

L Main DC

2. Alternating Current Loads

Not Affected

3. Type of Load Data Change

Type Nominal Maximum Other Information

Cyclic

OR

Intermittent

OR

Continuous +0.20A +0.20A see Note 1 below

NOTE 1: Applicable to operating conditions (OC) 1 through 8.

K. Publications Affected

Maintenance Manual PSM 1-84-2 ................................

Wiring Diagrams Manual PSM 1-84-2W ............................

Fault Isolation Manual PSM 1-84-23 ..............................

ModSums Manual PSM 1-84-12 ..................................

Weight and Balance Manual (Imperial) PSM 1-84-8 ................

Weight and Balance Manual (Metric) PSM 1-84-8M ..................
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L. References

Revision ‘B’ of this service bulletin was prepared to the engineering drawings and

related data that follows:

DRAWING SHEET REV

8DK4224 1 --

8Z6405 1 B

8Z6405 2 A

ModSum 4Q110595 Rev. ‘D’

ModSum 4-110595 Rev. ‘D’

PCA 44151 Revision 0 (for internal reference only)

Transport Canada Airworthiness Directive CF-2013-27.

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

(1) Detailed Parts List:

Quantity Per Aircraft

Part Number Description Remarks

2 FEET DSC230-6HT SPIRAL WRAP see NOTE 1

5 CSCS-M CABLE SPACER CROSS

30 CR4H CONNECTOR RING

50 B0816019-003 TIE STRAP see NOTE 2

4 M39029/56-351 CONTACT SOCKET

2 M81824/1-2 SPLICE

2 M81824/1-1 SPLICE

46 FEET B0801150-20-9 WIRE 20AWG see NOTE 3

NOTE 1: AMP (09482) P/N 500023 or Panduit (06383) P/N T12T or Zeus

(6Y909) P/N 2E125SCL9 are acceptable alternates.

NOTE 2: Panduit (06383) P/N PLT2S-(*)76 is an acceptable alternate.

(*) indicates quantity.
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NOTE 3: Judd (12703) P/N JWB0801150-20-9 or Tyco (K1010) P/N

55PC0211-20-9 are acceptable alternates

B. Parts Required to Modify Spares

None

C. Special Tools and Equipment Required

None

D. Existing Parts Accountability

None

3. ACCOMPLISHMENT INSTRUCTIONS

A. Job Set-Up

WARNING: MAKE SURE YOU INSTALL THE LOCKPINS ON THE MAIN LANDING

GEAR. MAKE SURE YOU ENGAGE THE NOSE GEAR LOCK. IF YOU

DO NOT DO THIS, THE LANDING GEAR CAN ACCIDENTALLY

RETRACT. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE

TO THE EQUIPMENT.

WARNING: MAKE SURE YOU INSTALL THE LOCKPINS IN THE DOOR

MECHANISMS OF THE MLG AND NLG. THE DOOR MECHANISMS

CAN ACCIDENTALLY CLOSE THE LANDING GEAR DOORS. THIS CAN

CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT.

(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 through each main gear and main gear

door mechanism.

(3) Make sure the nose gear ground lock is engaged.

(4) On the LHS remove passenger seats from the airstair door up to station

X236.00, refer to AMM Task 25-21-01-000-801.

(5) Remove centre aisle carpet as well as carpet on the LHS from flight

compartment door up to station X236.00, refer to AMM Task 25-25-06-000-801.
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(6) Remove the following floor boards, refer to AMM Task 06-43-00-992-801 for

location:

- wardrobe floor

- 133AZ to 133FZ

- 131CZ to 131GZ

B. Procedure

(1) Reterminate the following wires (one end only):

NOTE: Remove any excess wire or tape and stow both ends of the remaining

wire. Refer to wiring diagram Figure 8 for length of wire and physical

location of splices.

(2) Reterminate the following wires (one end only):

NOTE: Refer to wiring diagram Figure 8 for length of wire and physical location of

splices.

NOTE: Maximum wire length of 6 inches is required in order to keep splices

close to the connector, so they can be located and serviced if required.

(3) Install new cable assemblies 8Z6405-011 and 8Z6405-013 as follows:

NOTE: Cable assemblies 8Z6405-011 and -013 are not provided in a kit and are

to be assembled by the operator using parts in section 2.A.(1). Refer to

page 17 of this service bulletin for composition of cable assemblies.
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(a) Route with existing cable harness as shown with compatible way

codes/EMC codes per WDM PSM 1-84-2W Chapter 20-12-10.

(b) Use existing clipping where practical or use connector rings CR4H or cross

spacers CSCS-M to maintain segregation.

(c) Install splices close to connectors, maximum of 6 inches, to ease locating

during maintenance and repair activities. Support splices in wire bundle

using tie-down straps B0816019-003.

(d) Identify wires per WDM Task 20-10-00-201.

C. Close Out

(1) Remove all tools and equipment from the work area.

(2) Do the enclosed Return to Service procedure

(3) Install the following removed floor boards, refer to AMM Task 06-43-00-992-801

for location:

- wardrobe floor

- 133AZ to 133FZ

- 131CZ to 131GZ

(4) Install removed carpet, refer to AMM Task 25-25-06-400-801.

(5) On the LHS install removed passenger seats, refer to AMM Task

25-21-01-400-801.

(6) On incorporation of this ModSum, add the weight and balance data shown in

Section 1 of this service bulletin to the Weight and Balance Manual PSM 1-84-8.

Under ‘Description of Change’ enter “ModSum 4-110595 incorporated.”

(7) 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.
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Segregation of HPSOV Power Circuit From TMU - Plan View

Figure 1
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Segregation of HPSOV Power Circuit From TMU - View B-B

Figure 2
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(ECS DUCT)

Segregation of HPSOV Power Circuit From TMU - View C-C

Figure 3
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Segregation of HPSOV Power Circuit From TMU - View D-D
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Segregation of HPSOV Power Circuit From TMU - View E-E

Figure 5
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Segregation of HPSOV Power Circuit From TMU - View F-F

Figure 6
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Segregation of HPSOV Power Circuit From TMU - Detail G

Figure 7
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Wiring Diagram

Figure 8
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see NOTE below see NOTE below

NOTE: Judd (12703) P/N JWB0801150-20-9 or Tyco (K1010) P/N

55PC0211-20-9 are acceptable alternates

4

5

6

7

9

10

STRAP TIE DOWN

B0816019-003

CONNECTOR RING

CR4H

SPACER

CROSS

CSCS-M

SPIRAL WRAP

DSC230-6HT

CABLE ASSEMBLY

8Z6405-013

CABLE ASSEMBLY

8Z6405-011

PARTS FIND NUMBER
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NOTES
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This Page Intentionally Blank.

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