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-N22/33 Rudder Structure and Trim Tab Control Rod - Inspection and Modification 3/80 Applicability: All N22 and N24 series with S/Nos. listed in GAF Alert SB No. ANMD-55-11. Document: GAF Alert SB No. ANMD-55-11. Compliance: As per requirement document. Background: The manufacturer has received reports of partial failure of an intercostal member and chafing of the trim tab control rod in service.