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-2/9 Amdt 4 Empennage - Inspection and Modification NK Applicability: All models. Requirement: 1. Modify the elevator trim tab installation in accordance with Britten Norman Modification Leaflet No. BN-2/NB/M/507. 2. Perform the inspections detailed in Britten Norman SB No. BN-2/SB49. 3. Perform the additional torque inspections detailed in Britten Norman SB No. BN- 2/SB49A. Note: The inspection detailed in para. 2 may be performed and certified by the pilot in command. Compliance: For para. 1 - Before 30 September 1971. For para. 2 - At intervals not exceeding 50 hours time in service after 28 November 1975. For para. 3 - Within 5 hours time in service after 9 May 1974.