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-28/60 Carburettor Air Filter Box - Modification 3/77 Applicability: Model PA-28-151 with S/Nos. 28-7415001 to 28-7715278 and 28-7715289. Document: 1. Piper SB No. 536; or 2. FAA AD 77-01-03. Compliance: Within 100 hours time in service after 31 March 1977.