COMMONWEALTH OF AUSTRALIA CIVIL AVIATION ORDERS CIVIL AVIATION SAFETY AUTHORITY PART 105 SCHEDULE OF AIRWORTHINESS DIRECTIVES GULFSTREAM (GRUMMAN) G.159 SERIES AEROPLANES AD/G159/37 Main Landing Gear Uplock Beam Assembly - Inspection 3/80 Applicability: All Model G159. Document: Gulfstream American Customer Bulletin No. 12. Compliance: At each daily or overnight inspection. Note: This inspection may be performed and certified for by the pilot in command. Background: Failures of the M.L.G. uplock beam assembly have occurred in overseas registered areoplanes.