COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-36 (Pawnee Brave) Series Aeroplanes AD/PA-36/15 Amdt 1 Tail Wheel Assembly - Modification 6/77 Applicability: All models with S/Nos. 36-7360001 to 36-7660135. Document: Piper SB No. 506. Compliance: Within 100 hours time in service after 30 June 1977.