COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-34 (Seneca) Series Aeroplanes AD/PA-34/18 Quick Disconnect Seat Retention Mechanism - Inspection Applicability: Model PA-34-200 with S/Nos. 34-7250001 to 34-7450220. Model PA-34-200T with S/Nos. 34-7570001 to 34-7570054. Document: Piper SL No. 763. Compliance: Within 100 hours time in service after 30 January 1976. 12/75