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 na me. 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 ma y 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 b y the Continuin g Airworthiness Division ( AARDG ) , National Aircraft Certification Branch, Trans p ort Canada, Ottawa, tele p hone 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 Communicat ions 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
2 4-0022 ( 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 investigati on revealed that in bot h cases, the uplock assembly had been replaced prior to the in-s ervice 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 affe ct 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 upl ock 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 Accomp lishment 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.