COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 204 Series Helicopters 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 39.1 (1) of CAR 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. AD/BELL 204/35 Tail Rotor Gearbox Duplex Bearings 8/2000 Applicability: Model 204B. Requirement: Remove from service tail rotor gearbox duplex bearing sets P/N 204-040-424-001 with S/Nos 1 to 182, MB183 to MB382, MB442, MB486, MB513, MB518, MB519, MB524, MB530, MB531, MB544, MB545, MB548, MB549, MB551, MB553, MB554, MB561, MB659, MB743, MB744, MB760 to MB769, and MB927 to MB936 inclusive installed in tail rotor quill P/N 204-040-012-009. Note: FAA AD 90-01-11 refers. Compliance: Before further flight after the effective date of this directive. This Airworthiness Directive becomes effective on 10 August 2000. Background: This directive is issued to prevent failure of the tail rotor gearbox and subsequent loss of control. It also follows the re-introduction of the AD Series after sixteen years. David Alan Villiers Delegate of the Civil Aviation Safety Authority 6 July 2000 The above AD is notified in the Commonwealth of Australia Gazette on 12 July 2000.