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-N22/32 Trim Tab Hinge to Horizontal Stabiliser Attachment - Inspection 3/80 Applicability: All N22 and N24 series which have had replacement trim tab hinge P/N MS20001-4 fitted in service. Document: GAF Telex Alert SB ANMD-27-16. Compliance: Unless already accomplished, within 20 hours time in service after 14 February 1980. Background: An operator has had a replacement hinge fitted in which the rivet holes in the horizontal stabiliser attach section of the hinge were drilled with nil edge distance.