COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes AD/SA-TP/21 Passenger Lap Straps NK Applicability: All models fitted with lap straps P/N ME/2095. Document: Scottish Aviation TNS No. 36. Compliance: Forthwith.