COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES 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. Harbin Y12 Series Aeroplanes AD/Y12/2 Hydraulic Pump Switch Guard 1/2003 Applicability: Y12 I or Y12 II aeroplanes. Requirement: If not previously accomplished, install a switch guard (safety lock key) to the hydraulic pump switch in accordance with Harbin Aircraft Manufacturing Corporation Service Bulletin (SB) Y12-29-0057 dated 18 May 1995. Note: China CAAC AD CAD95-Y012-02 Amdt 39-1414 refers. Compliance: Before 30 April 2003. This Airworthiness Directive becomes effective on 23 January 2003. Background: This Directive introduces a switch guard on the hydraulic pump switch to prevent the hydraulic pump being inadvertently turned off. Turning off the hydraulic pump will prevent safe operation of the aircraft braking system. James Coyne Delegate of the Civil Aviation Safety Authority 22 November 2002 The above AD is notified in the Commonwealth of Australia Gazette on 18 December 2002.