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-6/16 Battery Installation - Modification N/K Applicability: All models PC-6/340 and PC-6/350. Document: Pilatus SB No. 34. Compliance: Before 1 November 1967.