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. AMD Falcon 50 and 900 Series Aeroplanes AD/AMD 50/43 Rivets between Frames 9 and 10, and 13/2007 Stringer Reinforcements Applicability: Model Falcon 900EX (version F900DX) aircraft, serial numbers 601 through 605. Requirement: Action in accordance with the requirements of EASA AD 2006-0320-E. Compliance: Before 31 December 2007. This Airworthiness Directive becomes effective on 20 December 2007. Background: The manufacturer has determined that some stringer reinforcements and some rivets are missing from the skin panels on each side of the fuselage between frames 9 and 10 on certain Falcon 900DX aircraft. David Villiers Delegate of the Civil Aviation Safety Authority 7 November 2007