COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-30 & 39 (Twin Comanche) Series Aeroplanes AD/PA-30/30 Fuel Selector Valve - Inspection 10/78 Applicability: Models PA-30 with S/Nos. 30-2 to 30-2000, PA-39 with S/Nos. 39-1 to 39-155. Document: Piper SL No. 851, Part A. Note: Items 1 to 4 only may be performed and certified by the pilot. Compliance: Within 50 hours time in service after 30 October 1978 and thereafter at intervals not exceeding 100 hours time in service.