.+. Transport

Canada

Transports

Canada

CF-2010-31

Issue Dale

TP 7245E

I 1/3

Number:

AIRWORTHINESS

CF·2010~31

3 September 2010

DIRECTIVE

Subject:

Effective:

Applicability:

Compliance:

Background:

Corrective

Actions:

Fuel System Safety - Introduction of Design Changes

21 September 2010

Bombardier Inc. Models DHC·8-400, DHC~8·401, DHC-8-402 aeroplanes, Serial

Numbers 4003, 4004, 4006 and 4008 through 4205

Compliance is required as indicated unless already accomplished.

Bombardier Aerospace has completed a system safety review of the aeroplanes fuel

system against fuel tank safety standards introduced in Chapter 525 of the Airworthiness

Manual through Notice of Proposed Amendment (NPA) 2002-043, The identified

non-compliances were then assessed using Transport Canada Policy Letter No. 525-

001, to determine if mandatory corrective action is required.

The assessment showed that a number of modifications to the fuel system are required

to mitigate unsafe conditions that could result In potential ignition source within the fuel

system.

A. Applicable to aeroplanes Serial Numbers (SIN) 4003, 4004, 4006 & 4008 through

4118.

1. Within 6000 hours air time after the effective date of this directive, incorporate

the modifications detailed below:

a. Modsum 4-126330, Fuel Tank System Design Left and Right Side (SFAR 88)

Retrofit. Approved instructions for the incorporation of Modsum 4-126330

are contained in Bombardier Service Bulletin (SB) 84-57-09 Revision B,

dated 3 September 2008, or later revisions approved by the Chief,

Continuing Airworthiness, Transport Canada,

Incorporation of Modsum 4-126330 prior to the effective date of this directive

according to the instructions contained in Revision A of Bombardier S8

84-57-09 meets the requirements of this paragraph_

b. Modsum 4-126366, Fuel Tank System and Fuel Indication - Wiring

Identification, Segregation and Installation (High Level Sensor and Fuel

Quantity Indication) - Retrofit. Approved instructions for the incorporation of

Modsum 4·126366 are contained In Bombardier SB 84-28-04 Revision B,

dated 21 October 2009, or later revisions approved by the Chief, Continuing

Airworthiness, Transport Canada.

Incorporation of Modsum 4-126366 prior to the effective date of this directive

according to the instructions contained in the initial issue and Revision A of

Bombardier S8 84-28-04 meets the requirements of this paragraph.

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No. CF-2010-31

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c_ Modsum 4-901425, Fuel Feed to APU - Replacement of Couplings in Center

Wing Left Side - SFAR 88. This Modsum is required only on aeroplanes with

the APU option (Modsum 4-302000). Approved instructions for the

incorporation of Modsum 4-901425 are contained in Bombardier 5B 84-28-

05 Initial Issue, dated 28 June 2006, or later revisions approved by the Chief,

Continuing Airworthiness, Transport Canada.

2. Except as provided in paragraph A.2.a. and A.2.b. below, for aeroplanes that

have incorporated either Modsum 4-126330 or 4-901425 prior to the effective

date of this directive, carry out Fuel System LimitaLion(FSL) task 28400-417

(Functional Check of the Fuel Tank Components and Plumbing Lines for

Electrical Bonding) contained in DHC-8 Series 400 Maintenance Requirements

Manual. PSM 1-84-7, Part 2 "Airworthiness Limitation Items" within 6000 hours

air time after the effective date of this directive.

a. Aeroplanes that have successfully compleLed FSL task 28400-417 after

incorporation of the above-noted Modsums do not need to comply with the

requirements of paragraph A.2. above.

b. Aeroplanes that have the above-noted Modsums incorporated during

manufacturing of the aeroplane do not need to comply with the requirements

of paragraph A.2. above.

3. For aeroplanes that have incorporated neither Modsums 4*126330 nor 4-901425

before the effective date of this directive, carry out FSL task 28400-417 upon

completion of the incorporation of Modsum 4-126330 and, if applicable, Modsum

4-901425.

B. Applicable to aeroplanes SIN 4003, 4004, 4006 & 4008 through 4118

manufactured before 21 September2005.

Within 6000 hours air time after the effective date of this directive, incorporate

Modsum 4-126370, Fuel Tank System - Enhance Protective Covering for Electrical

Cable Assembly. Approved instructions for the incorporation of Modsum 4·126370

are contained in Bombardier SB 84-28-03 Revision C, dated 15 May 2009 or later

revisions approved by the Chief, Continuing Airworthiness, Transport Canada.

Incorporation of Modsum 4-126370 prior to the effective date of this directive

according to instructions contained in Revision B of Bombardier SB 84-28-03 meets

the requirements of this paragraph.

c. Applicable to aeroplanes SIN 4003, 4004, 4006 & 4008 through 4118

manufactured on or after 21September2005.

Within 12 000 hours air time after the effective date of this directive, incorporate

Modsum 4-126370, Fuel Tank System - Enhance Protective Covering for Electrical

Cable Assembly. Approved instructions for the incorporation of Modsum 4-126370

are contained in Bombardier SB 84-28-03 Revision C, dated 15 May 2009 or later

revisions approved by the Chief, Continuing Airworthiness, Transport Canada.

Incorporation of Modsum 4-126370 prior to the effective date of this directive

according to instructions contained in Revision B of Bombardier SB 84-28-03 meets

the requirements of this paragraph.
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No CF-2010-31

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D. Applicable to aeroplanes SIN 4119 through 4205.

Within 6000 hours air time after the effective date of this directive, incorporate

Modsum 4-113580, Electrical System ~ Fuel, High Level Sensor - Sealant Application

on Sensor Terminal Screws. Approved instructions for the incorporation of Modsum

4-113580 are contained in Bombardier S8 84-28-07 Initial Issue, dated 1 August

2008 or later revisions approved by the Chief. Continuing AilWorthiness, Transport

Canada.

Authorization: For Minister of Transport, infrastructure and Communities

ORIGINAL SIGNED BY

Robin Lau for

Derek Ferguson

Chief, Continuing Airworthiness

Contact: Mr. Philip Tang, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile

613-996-9178 or e-mail CAWWEBFeedback@tc.gc,ca or any Transport Canada Centre.