COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-31 Series Aeroplanes AD/PA-31/69 Fuel System Control Cables - Inspection 7/78 Applicability: PA31, PA31-300 and PA31-325 Navajo with S/Nos. 31-2 to 31-7612065. PA31P with S/Nos. 31P-1 to 31P-7630017. Document: 1. Piper SB No. 507; or 2. FAA AD 77-26-02. Compliance: Within 100 hours time in service after 31 July 1978 and thereafter at intervals not exceeding 100 hours.