COMMONWEALTH OF AUSTRALIA CIVIL AVIATION ORDERS CIVIL AVIATION SAFETY AUTHORITY PART 105 SCHEDULE OF AIRWORTHINESS DIRECTIVES GULFSTREAM (GRUMMAN) G.159 SERIES AEROPLANES AD/G159/38 Control Column Wheel Attaching Shaft - Inspection 7/80 Applicability: All models G159. Document: Gulfstream American Customer Bulletin No. 312. Compliance: Within 100 hours time in service after 31 July 1980. Background: A pilot's control wheel separated from the control column during a landing approach in a model G1159 aeroplane which has a similar control column assembly.