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-2/36 Engine Mounting Brackets - Inspection NK Applicability: All models BN-2A which have achieved 2 years since date of manufacture. Document: Britten Norman SB No. BN-2/SB.91. Compliance: Within 100 hours time in service after 15 July 1976.