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-2/11 Amdt 1 Elevator Trim Final Drive Lever - Inspection NK and Modification Applicability: All models not incorporating Modification No. NB/M/394. Document: Britten-Norman SB No. BN-2/SB.24. Compliance: Inspect within 10 hours time in service after 23 February 1970 and thereafter at intervals not exceeding 25 hours time in service until modified.