COMMONWEALTH OF AUSTRALIA CIVIL AVIATION ORDERS CIVIL AVIATION SAFETY AUTHORITY PART 105 SCHEDULE OF AIRWORTHINESS DIRECTIVES GULFSTREAM (GRUMMAN) G.159 SERIES AEROPLANES AD/G159/40 Main and Nose Landing Gear Uplock Cylinder Attach Bolts - Replacement Applicability: All models G159-1, -1C and -TC4C. Document: Gulfstream American Customer Bulletin No. 285A. 5/82 Compliance: Unless already accomplished, within 100 hours time in service after 31 May 1982. Background: Loss of a main landing gear uplock cylinder attach bolt has resulted in a gear up landing involving an overseas aeroplane.