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. Eurocopter BO 105 Series Helicopters AD/BO 105/19 Tail Rotor Blade Grips 10/2007 Applicability: All Messerschmitt-Bolkow Blohm (MBB) Model BO 105 helicopters, equipped with tail rotor blade grips part number 105-31711 and 105-31722. Requirement: Action in accordance with the requirements of LBA AD 78-339. Note: MBB BO 105 Service Bulletin No. 30-24 refers. Compliance: As specified in the Requirement document. This Airworthiness Directive becomes effective on 27 September 2007. Background: The LBA requires inspections of tail rotor blade grip inboard ends for cracking. David Villiers Delegate of the Civil Aviation Safety Authority 13 August 2007