COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pilatus Porter PC-6 Series Aeroplanes AD/PC-6/19 Sliding Door - Modification N/K Applicability: All models with S/nos. 519, 596, 597, 600, 601, 617, 620 621, 622, 623, 626 and 628. Document: Pilatus SB No. 73. Compliance: Before 2 November 1967.