COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES GAF N22 and N24 Series Aeroplanes AD/GAF-N22/61 Amdt 1 Trim Tab Hinge 6/91 Applicability: Nomad series aircraft with S/Nos N22S-159 to N22S-165 inclusive, incorporating Mod N663. Requirement: Action in accordance with ASTA Nomad Alert SB ANMD-55-25 Parts 1 and 2. Compliance: For Part 1. In accordance with initial issue of this Directive: Prior to exceeding 10 hours time in service after 6 June 1990. For Part 2. In accordance with initial issue of this Directive: Prior to exceeding 200 hours time in service after 6 June 1990. The effective date of this amendment is 13 June 1991. Background: A condition may exist where the trim tab position of the horizontal stabilizers is incorrect, leading to a possibility of binding and overstress of the trim tab linkage with the stabilizer and trim setting at certain positions. This Amendment is raised to introduce a Revision of the Requirement document, which issues the accomplishment instructions for Part 2; replacement of the trim tab hinge.