COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-24 (Comanche) Series Aeroplanes AD/PA-24/39 Fuel Selector Valve - Inspection 12/78 Applicability: Model PA-24-400 with S/Nos. 26-2 to 26-148. Document: Piper SL No. 851, Part A. Note: Items 1 to 4 only may be performed and certified by pilot. Compliance: Within 50 hours time in service after 30 October 1978 and there- after at intervals not exceeding 100 hours time in service.