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. Dassault Aviation Falcon 2000 Series Aeroplanes AD/F2000/27 Wing Anti-Ice Monitoring System 7/2007 Applicability: Falcon 2000EX aeroplanes, serial numbers 1 to 5 and 7 to 27 inclusive, without Dassault Aviation Modifications M2814 and M2949 incorporated. Requirement: Unless previously accomplished, modify the electrical wiring of the wings anti-ice system in accordance with the accomplishment instructions of Dassault Aviation Service Bulletin (SB) F2000EX-116 dated 31 May 2006 and F2000EX-140 dated 28 February 2007, or later revisions approved by the European Aviation Safety Agency (EASA). Note: EASA AD 2007-0137 refers. Compliance: Within the next six months after the effective date of this Directive. This Airworthiness Directive becomes effective on 5 July 2007. Background: EASA has advised that analyses of in-service reports revealed that in instances of failure of the wings anti-ice valve, indications of untimely anti-icing with the wings anti-ice selector on "OFF" or of insufficient anti-icing with the wings anti-ice selector on "AUTO" might not be properly displayed to the flight crew. It may result, on ground, in potential structural damages due to a leading edge overheat, or in-flight, in an insufficient anti-ice power. This Directive mandates an upgrade of the wing anti-ice monitoring circuitry per implementation of modifications M2814 (SB F2000EX-116) and M2949 (SB F2000EX-140) to cover the whole monitoring logic of the wings anti-ice system. Charles Lenarcic Delegate of the Civil Aviation Safety Authority 18 May 2007