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-N22/34 Horizontal Stabiliser Gust Lock - Installation 4/80 Applicability: All models N22, N22B, N24 and N24A with S/Nos. referenced in SB NMD-55-9. Document: GAF SB No. NMD-55-9. Compliance: Before 1 August 1980. Background: The horizontal stabiliser and control system have been damaged by strong wind gusts even with the pilot's control lock engaged.