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-2/27 Aileron Mass Balance Attachment - Inspection and Modification 12/73 Applicability: All models. Document: Britten Norman SB BN-2/SB.67. Compliance: As per requirement document. Note: Daily inspection may be performed and certified by the pilot.