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-30/29 Aileron Spar - Inspection and Modification 1/77 Applicability: All models PA-30 and PA-39 with S/Nos. 30-2 to 30-2000; and 39-1 to 39-155 not incorporating Piper Kit No. 760914. Document: Piper SL No. 787. Compliance: Inspect within 100 hours time in service after 28 February 1977 and thereafter at intervals not exceeding 100 hours time in service until modified.