AD/DHC-8/127 Airworthiness Limitation Items (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 (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/127 Airworthiness Limitation Items 9/2006

Applicability:	DHC-8 aircraft, Models 400, 401, and 402, with serial numbers 4001, and 4003 through 4094.
Requirement:	Action in accordance with the requirements of Transport Canada AD CF-2004-19.
Compliance:	As specified in the Requirement document, with a revised effective date of 31 August 2006.
This Airworthiness Directive becomes effective on 31 August 2006.
Background:	During DHC-8-400 type certification fatigue testing, fatigue failures were discovered at the engine isolator bracket and at the orifice support tube, upper bearing and piston plug in the main landing gear shock strut assembly.  Failure of these components, which have been identified as principal structural elements, could adversely affect the structural integrity of the engine installation and of the main landing gear.

David Villiers
Delegate of the Civil Aviation Safety Authority

19 July 2006