COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pratt and Whitney Canada Turbine Engines - PW100 Series AD/PW100/6 Amdt 2 Intercompressor Case Ventilation 10/97 Applicability: PW118A, PW123, PW123AF, PW123B, PW124B, PW125B, PW126, PW126A engines. Requirement: Action in accordance with the technical requirements of Transport Canada Airworthiness Directive CF-92-03R2. Note: FAA AD 94-11-11 also refers. Compliance: Unless previously accomplished, as detailed in the requirement document. This amendment becomes effective on 11 September 1997. Background: This AD arises from reports of internal oil fires in the intercompressor case (ICC) which can result in aircraft damage and in-flight shutdown. ICC fires can occur as a result of spontaneous ignition of: (a) engine oil that has accumulated in the ICC cavity, or (b) air/oil mist that can reverse flow into the ICC following a No 5 bearing failure. The modifications mandated by this AD will prevent ICC fires. Amendment 1 revised the Directive to reflect the technical requirements of Transport Canada AD CF-92-03 R2 and to expand the "Background" information. This amendment corrects the reference to FAA AD 94-11-11. Amendment 1 of this airworthiness directive became effective on 10 November 1994. The original issue of this airworthiness directive became effective on 10 March 1993.