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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 na me. 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 invalidat e 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 Can ada, 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 Communica tions 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 Sp rings 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 effectiv e date of this direct ive, 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 confor m to the design requirements, due to the fact that a valve spring was installed on the fl apper 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 t he event of scavenge system failu re, 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 co llector tank at all times, this directive mandates a one-time inspection of each of t he six flapper valves, removal of the valve spring, if installed, and application of an i dentification mark on each inspected valve.

Corrective

Actions: Inspect each collector tank flapper valve, remo ve the valve spring, if installed, and apply the identification mark, in accordance wi th 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, In frastructure 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.