COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gulfstream (Grumman American) GA-7 Series Aeroplanes AD/GA-7/4 Fuel Lines - Replacement NK Applicability: Model GA-7 with S/Nos. GA7-0002 to GA7-0009, GA7-0011 to GA7-0057 and GA7-0059. Document: Gulfstream American SB No. ME-9 and Supplement 1. Compliance: Within 10 hours time in service after 12 February 1979.