COMMONWEALTH OF AUSTRALIA CIVIL AVIATION ORDERS CIVIL AVIATION SAFETY AUTHORITY PART 105 SCHEDULE OF AIRWORTHINESS DIRECTIVES GULFSTREAM (GRUMMAN) G.159 SERIES AEROPLANES AD/G159/17 Wing Front Beam - Wing to Fuselage Fitting - Inspection 1/72 Applicability: All models. Requirement: Inspect the wing to fuselage fittings at butt line 9.0 and associated areas as detailed in GRUMMAN GULFSTREAM 1 Service Change No. 190. Rework as necessary as detailed in that Service Change or a variation approved by the manufacturer. Compliance: Within 6 months after 28 January 1972 and thereafter at intervals not exceeding 1 year.