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-2/42 Amdt 3 Elevator Trim Tab Cracking 4/86 Applicability: All models listed in the Requirement Document. Requirement: Action in accordance with Pilatus Britten-Norman BN-2/S.B 142 Issue 4. Compliance: 1. Modify prior to the issue of a Certificate of Airworthiness. 2. Inspect in accordance with the Requirement Document. Background: Issue 4 of the Requirement Document has extended the post mod. inspection out to every 100 hours T.I.S.