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-N22/64 Aileron Structure 13/92 DM
Model N22 and N24 Series, equipped with ailerons P/N 1/N-24-101 LH, P/N 1/N-24- 102 RH, P/N 2/N-24-101 LH, and P/N 2/N-24-102 RH. Aircraft LS62, 119, and 159 to 165 are excepted.
1. Carry out an inspection of the ailerons in accordance with the Accomplishment Instructions of ASTA Nomad Alert Service Bulletin ANMD-57-9.
2. Incorporate Modification N634 in accordance with the Accomplishment Instructions of ASTA Nomad Alert Service Bulletin ANMD-57-9.
1. Within 50 hours time in service after 28 October 1992.
2. Prior to 31 December 1993.
The manufacturer had received reports from several operators of instances of buckling of the aileron leading edge skin, which was believed to be the cause of a loss of control of the affected aircraft. One loss of control incident was considered to be a result of aileron flutter, which had occurred at a lower than normal speed because the ailerons had suffered structural degradation, caused by a flap/aileron overspeed at some time prior to the incident.