COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Lycoming Piston Engines AD/LYC/80 Turbocharger Oil Inlet Adaptor Bushing 3/87 Applicability: All TIO, LTIO-540 Engines. Requirement: Replace the turbocharger oil inlet adaptor bushing if made of brass or bronze material, with a steel bushing. Note: Bushing P/N STD 1932 is an acceptable replacement. Compliance: Unless already accomplished, prior to the issue of the next Maintenance Release after 12 March 1987: and; At each overhaul period ensure a bushing of acceptable steel material is fitted. Background: Airworthiness Directive, AD/LYC/43, was cancelled in December 1985, the intent of which is now re-issued in response to an incident involving a Piper Navajo during flight. Loss of power and oil pressure resulted from the failure of the turbocharger oil inlet bushing made of brass material.