AD/CL-600/113 Passenger Door Corrosion (Cth)

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes

AD/CL-600/113 Passenger Door Corrosion 8/2009

Applicability:

Model CL-600-2B19 aircraft, serial numbers 7003 through 8089

Model CL-600-2C10 aircraft, serial numbers 10003 through 10265

Model CL-600-2D15 and CL-600-2D24 aircraft, serial numbers 15001 through 15173

Requirement:

Action in accordance with the requirements of Transport Canada AD CF-2009-23.

Compliance:

Before the accumulation of 15,000 flight hours or within 5,000 flight hours after
30 July 2009, whichever occurs later; unless already accomplished.

This Airworthiness Directive becomes effective on 30 July 2009.

Background:

Several cases of corrosion in lower structural members of the passenger door have been reported.  It was subsequently determined that a drainage ramp (constructed from resin) had deteriorated with time and was retaining moisture.  The ramp, therefore, requires removal, both to prevent further corrosion and to allow access to the door structure during future scheduled inspections.  Corrosion left undetected could eventually affect the structural integrity of the door and surrounding structure.

David Villiers
Delegate of the Civil Aviation Safety Authority

18 June 2009