COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gulfstream (Grumman) G1159 and G-IV Series Aeroplanes AD/G1159/17 Stall Barrier System In-Line Filters - Replacement 8/75 Applicability: Model G1159 with S/Nos. 1 to 164 and 775. Document: Grumman Aircraft Service Change No. 199. Compliance: As detailed in the requirement document.