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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)

1/1 No.

CF-2012-22

Issue Date 

 24 July 2012 

Number: CF-2012-22 

Subject: Main Landing Gear Uplock Assembly - Incorrect Installation 

Effective: 9 August 2012 

Applicability: Bombardier Inc. Aeroplane Model CL-600-2B19, Serial Numbers 7003 through 7990 

and 8000 through 8999 

Compliance: Within 5500 hours air time or 48 months, whichever occurs first, from the effective 

date of this AD, unless already accomplished. 

Background: There have been two reported in-service incidents where the left main landing 

gear (MLG) failed to extend. The investigation revealed that in both cases, the uplock 

assembly had been replaced prior to the in-service incidents and the upper bolt of the 

uplock assembly was incorrectly installed. The incorrect installation of the upper bolt 

resulted in the uplock assembly pivoting on the lower attachment bolt and preventing the 

MLG from extending under normal or alternate extension. 

The potential for an incorrect installation of the upper bolt could occur at both the 

left hand side (LHS) and/or the right hand side (RHS) MLG uplock assembly. Failure of

the MLG to extend could adversely affect the safe landing of the aeroplane. 

This AD mandates the installation of stopper plates on the aft uplock frames in the MLG 

bay, adjacent to both the RHS and LHS MLG uplock assemblies, to prevent an incorrect 

installation of the MLG uplock assembly. 

Corrective 

Actions: 

Install the stopper plate on the aft uplock frame of both the RHS and LHS MLG uplock 

assemblies in accordance with the Accomplishment Instructions in Bombardier 

Service Bulletin (SB) 601R-32-109, dated 29 May 2012, or later revisions approved by 

the Chief, Continuing Airworthiness, Transport Canada. 

Authorization: For the Minister of Transport, Infrastructure and Communities, 

ORIGINAL SIGNED BY

Philip Tang 

Acting Chief, Continuing Airworthiness 

Contact: Robert Farinas, Continuing Airworthiness, Ottawa, telephone 613-952-4357, 

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