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-28/56 Quick-Disconnect Seat Retention Mechanism - Inspection Applicability: Model PA-28-180 with S/Nos. 28-7105001 to 28-7505046. Model PA-28R-180 with S/Nos. 28R-7130001 to 28R-7130013. Model PA-28R-200 with S/Nos. 28R-7135001 to 28R-7535041. Model PA-28-235 with S/Nos. 28-7110001 to 28-7510016. Document: Piper SL No. 763. Compliance: Within 100 hours time in service after 30 January 1976. 1/76