COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pilatus Britten-Norman BN-2 Series Aeroplanes AD/BN-2/7 Elevator Trim System - Modification NK Applicability: All model BN-2A with S/No. 13 and subsequent and S/Nos. 10, 11 and 12 if Mod. NB/M/134 has been incorporated. Document: Britten-Norman Modification Leaflet BN-2/NB/M/179 Issue 2. Compliance: Within 100 hours time in service after 12 May 1969.