COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-46 (Malibu) Series Aeroplanes AD/PA-46/20 Exhaust Transition Bolts 8/91 TX Applicability: All model PA-46-350P fitted with Textron Lycoming TI0-540-AE2A engine with engine S/No up to but not including L9161-61A and excluding S/No L9157-61A. Requirement: Action in accordance with the Technical Requirements of FAA AD 91-10-04 Amdt 39-6981. Note: Textron Lycoming SB No 491A refers. Compliance: Within 10 hours time in service from 31 May 1991. Background: An aircraft accident has occurred caused by engine power loss, which resulted from exhaust transition flange bolt loss and flange separation.