Transport Transports 

Canada Canada

 TP 7245E

 

AIRWORTHINESS DIRECTIVE

The following airworthiness directive (AD) may be applicable to an aircraft which our records indicate is registered in your name. ADs are issued pursuant to Canadian 

Aviation Regulation (CAR) 521 Division X. Pursuant to CAR 605.84 and the further details of CAR Standard 625, Appendix H, the continuing airworthiness of a Canadian registered aircraft is contingent upon compliance with all applicable ADs. Failure to comply with the requirements of an AD may invalidate the flight authorization of the aircraft. 

Alternative means of compliance shall be applied for in accordance with CAR 605.84 and the above-referenced Standard. 

This AD has been issued by the Continuing Airworthiness Division (AARDG), National Aircraft Certification Branch, Transport Canada, Ottawa, telephone 613 952-4357.

Pursuant to CAR 202.51 the registered owner of a Canadian aircraft shall, within seven days, notify the Minister in writing of any change of his or her name or address. 

To request a change of address, contact the Civil Aviation Communications Centre (AARC) at Place de Ville, Ottawa, Ontario K1A 0N8, or 1-800-305-2059, or www.tc.gc.ca/civilaviation/communications/centre/ address.asp 

24-0022 (01-2005)

1/1 No.

CF-2010-21

Issue Date 

 20 July 2010 

Number: CF- 2010-21 

Subject: Fuel System – Inadequate Electrical Bonding of the Motive Flow Check Valve 

Effective: 16 August 2010 

Applicability: All Bombardier Inc. DHC-8 Aeroplanes Models 400, 401, and 402, Serial Numbers 4001 through 

4190, 4199 through 4201 and 4203 through 4216, equipped with Motive Flow Check Valve Part 

Number 2960018-101. 

Compliance: As indicated below unless already accomplished 

Background: During production quality inspections of the aeroplane fuel motive flow system, it was discovered 

that some motive flow check valves (MFCV) were manufactured with an outlet fitting containing red 

anodized threads. These MFCV do not provide adequate electrical bonding between the valve and 

the adjacent fitting. 

In the absence of proper electrical bonding within the motive flow system, the aeroplane fuel tank 

could be exposed to ignition sources in the case of a lightning strike. 

This directive is issued to verify the proper configuration of the MFCV and if required, replace the

affected MFCV with a MFCV that has a chemically filmed (gold color) outlet valve fitting, which

provides adequate electrical bonding. 

Corrective 

Actions: 

1. Within 6000 hours air time from the effective date of this directive, inspect the threads of the 

outlet fitting of the MFCV part number (P/N) 2960018-101 installed in the left and right wing fuel 

tanks in accordance with Bombardier Service Bulletin (SB) 84-28-08, initial revision, dated 11 

March 2010, or later revisions approved by the Chief, Continuing Airworthiness, Transport 

Canada. If the MFCV has a chemical film (gold color) check valve outlet fitting, no further action 

is required other than compliance with paragraph 3 of this directive. 

2. If the MFCV has a red anodized check valve outlet fitting, replace this MFCV before further

flight with a MFCV having a chemical film (gold color) outlet fitting in accordance with 

Bombardier SB 84-28-08, initial revision, dated 11 March 2010, or later revisions approved by 

the Chief, Continuing Airworthiness, Transport Canada. 

3. As of the effective date of this directive, no replacement MFCV P/N 2960018-101 with a red 

anodized check valve outlet fitting is allowed to be installed on DHC-8 series 400 aeroplanes. 

Authorization: For Minister of Transport, Infrastructure and Communities 

ORIGINAL SIGNED BY 

Robin Lau for 

Derek Ferguson 

Chief, Continuing Airworthiness 

Contact: Mr. Gordanko Jeremic, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

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