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. Fokker F50 (F27 Mk 50) Series Aeroplanes AD/F50/82 Bleed Air Supply Duct Assembly - Inspection/Modification 4/2002 Applicability: All Model F.27 Mk.050, 0502 and 0604 aeroplanes, all serial numbers Requirement: Inspect and modify in accordance with RLD AD 2001-130. Note: Fokker Service Bulletin F50-36-006 refers. Compliance: At the inspection and modification times specified in RLD AD 2001-130, from the date that this Airworthiness Directive is effective. This Airworthiness Directive becomes effective on 18 April 2002. Background: Heat damage was discovered during inspection at the engine controls area. Further inspection revealed that the inner wall of the bleed air supply duct assembly had ruptured and blanking plugs in the outer wall of the duct had blown out. This allowed bleed air (200-250 deg C) to escape into an area that contains control cables, electrical wiring, hydraulic components and cross-feed fuel lines. To prevent further similar events, this AD requires a onetime inspection to be carried out and a modification introduced that removes the blanking plugs and seals off the blanking plug holes by installing a clamping device with heat resistant adhesive. Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority 5 March 2002 The above AD is notified in the Commonwealth of Australia Gazette on 27 March 2002. Page 1 of 1