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) 593. 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-2009-40

Issue Date 

 9 November 2009 

Number: CF-2009-40 

Subject: Fuel Tank – Removal of Non-Conforming Springs from the Collector Tank Flapper 

Valves

Effective: 25 November 2009 

Applicability: Bombardier Inc. DHC-8 Models 201, 202, 301, 311, 314, and 315, Serial Numbers 644 

through 664. 

Compliance: Within 1 000 hours air time after the effective date of this directive, unless already 

accomplished. 

Background: During a recent production fuel system test, it was found that all three flapper valves 

located in each collector tank did not conform to the design requirements, due to the fact 

that a valve spring was installed on the flapper hinge pin. This valve spring should have 

been removed prior to installation of the valves. 

It was subsequently determined that this condition is restricted to the 21 aircraft listed in 

the Applicability section above. 

With the valve spring installed, the flapper valve is held closed by the valve spring, 

preventing gravity feed. In the event of scavenge system failure, the collector tank fuel 

level can no longer be maintained, potentially leading to an in-flight engine shutdown. 

In order to ensure adequate fuel transfer to the collector tank at all times, this directive 

mandates a one-time inspection of each of the six flapper valves, removal of the valve 

spring, if installed, and application of an identification mark on each inspected valve. 

Corrective 

Actions: 

Inspect each collector tank flapper valve, remove the valve spring, if installed, and apply 

the identification mark, in accordance with the Accomplishment Instructions in 

Bombardier Service Bulletin (SB) 8-28-54, dated 22 April 2009, or later revisions 

approved by the Chief, Continuing Airworthiness, Transport Canada. 

Authorization: For Minister of Transport, Infrastructure and Communities 

Derek Ferguson, 

Chief, Continuing Airworthiness 

Contact: Mr. Richard Topham, Continuing Airworthiness, Ottawa, telephone 613-952-4357, 

facsimile 613-996-9178 or e-mail CAW WEB Feedback@tc.gc.ca or any Transport 

Canada Centre.