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. Dornier 328 Series Aeroplanes AD/DO 328/14 Engine Air Intake De Icing System 1/2006 Applicability: Dornier 328-100 aeroplanes. Requirement: 1. Carry out an inspection of the engine air intake de-icing boots in accordance with paragraph 2.B.1 of Dornier 328 Service Bulletin No. SB-328-30-432 dated 26 April 2002 or later LBA approved revisions. 2. Carry out an inspection and operational check of the engine air intake de-icing boots in accordance with paragraph 2.B.2 of Dornier 328 Service Bulletin No. SB-328-30-432 dated 26 April 2002 or later LBA approved revisions. Note: LBA AD 2002-256 refers. Compliance: 1. At intervals not to exceed 60 flight hours. 2. At intervals not to exceed 800 flight hours. This Airworthiness Directive becomes effective on 19 January 2006. Background: The engine air intake de-icing system eliminates any ice formation on the leading edges of the engine air intakes. There have been several problems with debonded or delaminated de-icing boots. The consequence following a debonding or delamination of the engine-inlet de-icing boot could be an engine failure due to severe intake flow restriction. James Coyne Delegate of the Civil Aviation Safety Authority 29 November 2005