COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piaggio P166 Series Aeroplanes AD/P166/2 Engine Oil System Piping - Re-Routing 8/61 Applicability: S/Nos. prior to 362. Document: Piaggio Change Order No. 66-2. Compliance: Forthwith.