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. British Aerospace BAe 146 Series Aeroplanes AD/BAe 146/98 Environmental Control System - Component Inspection 5/2002 Applicability: BAe 146 and AVRO 146-RJ series aircraft as identified in BAE Systems (Operation ) Limited (Inspection Service Bulletin) ISB.21-155. Requirement: Carry out tasks specified in BAE Systems (Operations ) Limited ISB.21-155. Note: The requirement document has been classified as mandatory by the UK - CAA. Compliance: As specified in the requirement document with a revised effective date of 16 May 2002. This Airworthiness Directive becomes effective on 16 May 2002. Background: Discharge valves and pressure controllers incompatible with the environmental control system can give rise to potential unsafe conditions. BAe Systems ISB. 21-148 (CASA AD/BAe146/85 Amdt 1 refers) issued to correct the unsafe condition was found inadequate and has been superseded by BAE Systems ISB. 21-155. AD/BAe 146/85 Amdt 1 has been cancelled and superceded by this Directive Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority 7 April 2002 The above AD is notified in the Commonwealth of Australia Gazette on 24 April 2002 Page 1 of 1