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)

1/2 No.

CF-2009-15

Issue Date 

 17 April 2009 

Number: CF-2009-15 

Subject: Fuel System Safety - Introduction of Maintenance Tasks 

Effective: 7 May 2009 

Applicability: Viking Air Limited DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, DHC-7-103, 

DHC-7-110 and DHC-7-111 aircraft, all serial numbers. 

Compliance: As indicated below, unless already accomplished. 

Background: Viking Air Limited has completed a system safety review of the aircraft 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 noncompliances were then assessed using Transport Canada Policy Letter No. 525-001, to 

determine if mandatory corrective action is required. 

The assessment showed that supplemental maintenance tasks would be required to 

prevent potential ignition sources within the fuel system, which could result in a fuel tank 

explosion. Viking Air Limited has revised Chapter 5 of the DHC-7 Maintenance Manual, 

PSM 1-7-2, to introduce the required maintenance tasks. 

Corrective 

Actions: 

A. Incorporation of Fuel System Limitations (FSL) Tasks 

Within 60 days after the effective date of this directive, revise the Transport Canada 

approved maintenance schedule by incorporating all the FSL tasks introduced in 

Chapter 5 of the DHC-7 Maintenance Manual, PSM 1-7-2, through the following 

Temporary Revisions (TR). 

TR Number Task Number Description 

5-106 FSL 01 to FSL 08 FSL Introduction, Rules and 

Task List 

5-107 FSL-01 Detailed Inspection of the 

Electrical Isolation between the 

Fuel Probe Conduit and the 

Aircraft Structure 

5-108 FSL-02 Detailed Inspection of the 

Electrical Bonding between the 

Pressure Relief Valve Chassis 

and the Wing Fuel Tank 

Structure 

5-112 FSL-03 Special Detailed Inspection of 

the Dielectric Voltage Properties 

of the Aluminum Loaded Primer 

and Enamel on the Wing Top 

and Bottom Skin 
No.

 N° CF-2009-15 2/2 

5-113 FSL-04 and FSL-05 Detailed Visual Inspection of the 

Bonding Jumpers within the 

Fuel Tank for Condition, 

Security, Signs of Chafing and 

Corrosion and Electrical 

Bonding Check of all Jumpers 

5-109 FSL-06 Replacement of the Fuel Probe 

Wiring within the Fuel Tank 

5-110 FSL-07 Functional Check of the Wing 

Dry Bay Drain Valve 

5-111 FSL-08 Detailed Visual Inspection of the 

Fuel Containment Coating 

within the #4 Flap Track Canoe 

Fairing Landing Light 

Compartment and Visual 

Inspection of the Surge Bay 

Drain Line 

Note: Later revisions to the above-listed tasks introduced through Transport 

Canada-approved TRs or general revisions of the Maintenance Manual are 

also acceptable. 

B. Phase-in time for Tasks FSL-01, FSL-02, FSL-03, FSL-04 and FSL-05 

For aircraft that have, on the effective date of this directive, accumulated 12000 

hours air time or more, carry out the initial inspection of the above-listed tasks within 

6000 hours airtime or 36 months, whichever occurs first. 

C. Phase-in time for Tasks FSL-06 

For aircraft that have, on the effective date of this directive, accumulated 34000 

hours air time or more, carry out the above-listed task initially within 6000 hours 

airtime or 36 months, whichever occurs first. 

D. Phase-in time for Tasks FSL-07 

For all applicable aircraft, carry out the above-listed task initially within one month. 

E. Phase-in time for Tasks FSL-08 

For aircraft that have, on the effective date of this directive, accumulated 2000 hours 

air time or more, carry out the initial inspection of the above-listed task within 2000 

hours airtime or 12 months, whichever occurs first. 

Authorization: For Minister of Transport, Infrastructure and Communities 

Derek Ferguson 

Acting Chief, Continuing Airworthiness 

Contact: Mr. Philip Tang, Continuing Airworthiness, Ottawa, telephone 613-952-4365, facsimile 

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