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)

1/2 No.

CF-2009-45

Issue Date 

 11 December 2009 

Number: CF- 2009-45 

Subject: Aileron Terminal Quadrant Support Bracket Cracking

Effective: 7 January 2010 

Applicability: Bombardier Inc. DHC-8 Aircraft, Models 301, 311, 314, and 315, Serial Numbers 100 through 

530.

Compliance: When indicated, unless already accomplished. 

Background: Several cases of aileron terminal quadrant support brackets that were manufactured using sheet 

metal have been found cracked on DHC-8 Series 300 aircraft. Investigation revealed that the failure 

of the support bracket was due to fatigue. Failure of the aileron terminal quadrant support bracket 

could result in an adverse reduction of aircraft roll control. 

This directive mandates the replacement of the aileron terminal quadrant support bracket with a 

new and improved machined part. 

Corrective 

Actions: 

1. For aircraft with an aileron terminal quadrant support bracket, part number (P/N) 85711569 that 

have accumulated 30 000 hours air time or more at the effective date of this directive, 

incorporate Modsum 8Q101250 within 3 000 hours air time after the effective date of this 

directive. Bombardier Service Bulletin (SB) 8-57-43, Revision B, dated 7 October 2009, or later 

revisions approved by Chief, Continuing Airworthiness, Transport Canada, provides approved 

instructions for incorporating Modsum 8Q101250. 

2. For aircraft with an aileron terminal quadrant support bracket, part number (P/N) 85711569 that 

have accumulated less than 30 000 hours air time at the effective date of this directive, 

incorporate Modsum 8Q101250 within 6 000 hours air time after the effective date of this 

directive but not greater than 33 000 hours air time. Bombardier SB 8-57-43, Revision B, dated 

7 October 2009, or later revisions approved by Chief, Continuing Airworthiness, Transport 

Canada, provides approved instructions for incorporating Modsum 8Q101250. 

Note: Incorporation of Modsum 8Q101250 in accordance with Bombardier SB 8-57-43, Initial 

Issue, dated 9 August 2002 or Revision A, dated 17 January 2003 satisfies the 

requirement of this directive. 

Authorization: For Minister of Transport, Infrastructure and Communities 

ORIGINAL SIGNED BY 

Philip Tang for

Derek Ferguson 

Chief, Continuing Airworthiness 

Contact: Mr. Anthony Wan, 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. 
No.

 

N° CF-2009-45 2/2