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-6/26 Aileron and Flap Support Bracket - Inspection and Modification Applicability: All models including S/Nos. prior to 544 excluding S/No. 540. Document: Pilatus SB No. 84. 11/68 Compliance: Within 100 hours time in service from 4 November 1968. Modify before 1 July 1969.