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.

1/1 No.

CF-2014-14

Issue Date

5 June 2014

Number: CF-2014-14

ATA: 27 Type Certificate: A-27

Subject: Flight Controls - Loose Horizontal Stabilizer Actuator (Trim Jack) Mounting Block

Effective Date: 20 June 2014

Applicability: Viking Air Limited model DHC-3 aeroplanes, all serial numbers.

Compliance: Within 100 hours air time or 90 days, whichever occurs first, from the effective date 

of this AD.

Background: A horizontal stabilizer actuator (trim jack) mounting block, part number C3FS79-5, was 

found loose in the forward-aft and side-to-side directions. The trim jack mounting block 

fastens the stabilizer actuator (trim jack) which allows the angle of incidence of the 

stabilizer to be varied. The stabilizer actuator (trim jack) also functions as the rear 

mounting point for the stabilizer.

Failure of the mounting block through breakage or detachment may cause loss of control 

of the horizontal stabilizer and subsequent loss of control of the aeroplane. Therefore, this 

AD mandates a one-time inspection of the stabilizer actuator (trim jack) mounting block.

Corrective 

Actions:

Unless previously carried out per Viking Service Bulletin (SB) V3/0005 Revision A, dated 

7 April 2014, inspect the stabilizer actuator (trim jack) for discrepancy in accordance with 

the Accomplishment Instructions of Viking SB V3/0005, Revision A or later revisions

approved by the Chief, Continuing Airworthiness, Transport Canada.

If any movement is detected, prior to next flight, investigate the lower trim jack mounting 

block and mounting bracket in accordance with the Accomplishment Instructions of the 

above-noted SB and carry out the applicable rectification provided by Viking Air Limited.

Authorization: For the Minister of Transport,

ORIGINAL SIGNED BY

Derek Ferguson

Chief, Continuing Airworthiness

Contact: Yosha Mendis, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

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

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)