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-2/6 Main Fuel Pipe - Modification NK Applicability: All model BN-2A fitted with main fuel pipes P/N NB-57-439. Document: Britten-Norman SB BN-2/1SB11 Issue 2. Compliance: Within 100 hours time in service after 12 May 1969.