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SERVICE BULLETIN

Customer

Support

ATA SYSTEM: 2822 NUMBER: 84 ---28 ---05

BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS

SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND

URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Fuel --- Fuel Feed to APU --- Replacement of Couplings in Center

Wing Left Side --- SFAR 88 --- ModSum 4 ---901425

1. PLANNING INFORMATION

A. Effectivity

Aircraft Affected:

In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4003,

4004, 4006 and 4008 thru 4118 with prerequisite ModSum

4 ---302000 (APU option)

Verification: ModSum 4 ---901425 has been installed on DHC ---8 Aircraft

Model 402 Serial Number 4006.

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: Two existing couplings (p/n BO305025A08) one installed immediately

before and the second installed immediately after the APU shut ---off

valve (engine fuel feed installation --- center wing left side) require

replacement in order to meet SFAR 88 (Special Federal Aviation

Regulation) requirements.

Solution: Two existing self bonded couplings (p/n BO305025A08) are replaced

with new self bonded couplings (p/n BO305082A08) that have an

increased electrical current capacity.

The new couplings are designed to enhance fuel tank system safety

and meet the FAA certification requirements given in the SFAR 88

regulations.

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

--- the aircraft is pressure defueled

--- the aircraft electrical system is de ---energized

--- work platforms or ladders are setup as required (left wing inboard section)

--- center wing access panels 521BT and 522AT are removed

--- existing couplings BO305025A08 (qty. 2) and related preformed packing are

removed

--- new couplings B0305082A08 (qty. 2) and preformed packings MS29513 ---015

(qty. 4) are installed

--- close ---out is accomplished.

D. Compliance

Bombardier Inc. highly recommends that ModSum 4 ---901425 be incorporated at

the earliest opportunity unless otherwise directed by the operator’s airworthiness

authority.

An Airworthiness Directive from Transport Canada is pending.
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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.

F. Manpower

It will take less than one man ---hour to replace the two fuel couplings at the fuel

shutoff valve in the left wing if this service bulletin is incorporated concurrently with

service bulletin 84 ---57 ---09 (ModSum 4 ---126330).

All costs to incorporate this modification are the responsibility of the Operator

G. Material --- Price and Availability

ModKit 8MK4259 ---001 is available through the Customer Accounts Service Team

at Bombardier Aerospace Regional Aircraft division. Operators should submit a

purchase order specifying aircraft serial number(s) to:

Bombardier Aerospace

Customer Accounts Services Team (Mail Stop N11 ---32)

123 Garratt Blvd.

Downsview

Ontario

Canada M3K ---1Y5

Facsimile: (416) 375 ---3060

Telephone : (416) 375 ---3920

Kit Number Description Price (US$) Delivery

8MK4259 ---001 Couplings Fuel

System for APU ---

Wing Left Hand ---

SFAR 88

Quoted at

time of order

Will be given

at time of

order
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H. Tooling --- Price and Availability

None

I. Weight and Balance

None

J. Electrical Load Data

Not affected

K. Publications Affected

Dash 8 Illustrated Parts Catalogue PSM 1 ---84 ---4 ....................

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

L. References

The initial issue of this service bulletin was prepared to the engineering drawings

and related data that follows:

DRAWING SHEET REV

8MK4259 1 ---

8Z4596 1 A

ModSum 4Q901425 Rev. ‘B’

ModSum 4 ---901425 Rev. ‘B’

PCA 40933 Revision 2 (for internal reference only)

Transport Canada Airworthiness Directive Pending

2. MATERIAL INFORMATION

A. Parts Required Per Aircraft

(1) Modification Kit 8MK4259 ---001

(2) Detailed Kit Content:

Quantity Per Kit

---001

Part Number Description Remarks

4 MS29513 ---015 Preformed packing

2 B0305082A08 Coupling

NOTE: This service bulletin is self ---contained (illustrated). No drawings will be

supplied.
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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.

Part Number Qty. Per Aircraft Description Remarks

04 ---14 1 ounce Petroleum Jelly ---

Petrolatum

Refer to Consumable

Products Manual

PSM 1 ---84 ---18,

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.

Existing

Part Number Description Qty. IC DC

New Part

Number PNC

B0305025A08 Coupling 2 C DIS B0305082A08 S

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.
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DC Disposition

DIS Discard Part.

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.

3. ACCOMPLISHMENT INSTRUCTIONS

A. Job Set ---Up

WARNING: OBEY ALL THE FUEL SAFETY PRECAUTIONS WHEN YOU DO WORK

ON THE FUEL SYSTEM AND/OR A FUEL SYSTEM COMPONENT. IF

YOU DO NOT YOU CAN CAUSE INJURIES TO PERSONS AND/OR

DAMAGE TO EQUIPMENT.

(1) Make sure that lock pins are installed thru each main gear and main gear door

mechanism.

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

(3) Pressure defuel the applicable fuel tank ( Refer to TASK 12 ---10 ---28 ---650 ---802 ).

(4) Make sure to de ---energize the aircraft electrical system (refer to AMM TASK

24 ---00 ---00 ---861 ---802).

(5) Set up work platforms or ladders around and/or under the inboard section of the

left wing to permit access to access panels 521BT and 522BT (refer to Figure 1).

Make sure that the work platforms or ladders are electrically grounded.

(6) Make sure to obey the fuel system safety precautions (refer to AMM TASK

28 ---00 ---00 ---910 ---801).

WARNING: MAKE SURE THAT THE FUEL TANK IS DRAINED BEFORE YOU

REMOVE THE ACCESS PANELS. IF YOU DO NOT DO THIS, YOU CAN
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CAUSE DAMAGE TO THE WING STRUCTURE.

(7) Remove the center wing access panels that follow (refer to AMM TASK

57 ---11 ---01 ---000 ---801 and TASK 57 ---11 ---06 ---000 ---802):

ACCESS DESIGNATION

521BT Dry Bay Fuel Access Panels

522AT Center Wing Fuel Access Panel

(8) Make sure to remove the fuel fumes from the fuel tank (refer to AMM TASK

28 ---10 ---00 ---840 ---802).

B. Procedure

(1) Locate the APU shut ---off valve (SOV) in the left side of the center wing section

(refer to Figures 1 and 2).

(2) Remove and discard the existing coupling B0305025A08 and related packings

located on each side of the SOV (refer to Figure 2).

NOTE: If the sleeve and o --- rings of a B0305025A08 coupling are not disturbed. It

is acceptable to replace the clam shell only without replacing the sleeve

and o --- rings.

(3) Lubricate new packings MS29513 ---015 (qty. 4) with petroleum jelly.

(4) Install one packing MS29513 ---015 in position at the end of each tube assembly

and to the SOV (refer to Figure 3).

(5) Carefully connect the tubes and the SOV together with new couplings

B0305082A08 (qty. 2) and sleeves.

C. Close Out

(1) Remove all unwanted material from the rework area.

(2) Install the center wing access panels that follow (refer to TASK

57 ---11 ---01 ---400 ---801 and TASK 57 ---11 ---06 ---400 ---802):

ACCESS DESIGNATION

521BT Dry Bay Fuel Access Panels

522AT Center Wing Fuel Access Panel

(3) Remove all tools and equipment from the work area.
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(4) 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

incorporation of all work defined in this service bulletin.
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Figure 1

DETAIL A

SEE FIGURE 2

522BT

521AT
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Figure 2

NEW COUPLING B0305082A08 (2 REQD)

PREFORMED PACKING MS29513 ---015 (4 REQD)

APU SHUT ---OFF VALVE

REAR SPAR

REF

DETAIL A TUBE ASSY

TUBE ASSY

REF

SEE FIGURE 3 FOR DETAIL VIEW

REF

EXISTING COUPLING BO305025A08 (QTY 2)

AND PREFORMED PACKINGS (QTY4) REMOVED
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Figure 3

TUBE ASSY

TUBE ASSY

SHUT ---OFF VALVE

PACKINGS

MS29513 ---015

COUPLING AND SLEEVE

B0305082A08

(2 REQD)

COUPLING AND SLEEVE

B0305082A08

PACKINGS

MS29513 ---015

(2 REQD)

SOV CONNECTOR

SOV ACTUATOR
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