COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-28 Series Aeroplanes AD/PA-28/63 Fuel Filler Cap - Inspection and Replacement 7/77 Applicability: Model PA-28-235 with S/Nos. 28-10001 to 28-11236. Document: Piper SB No. 571, Part B. Compliance: Within 100 hours time in service after 31 July 1977.