COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gulfstream (Rockwell) 112 Series Aeroplanes AD/AC-112/4 Engine Oil Pressure Line - Replacement 1/77 Applicability: Model 112 with S/Nos. 3 to 470. Document: Rockwell International SB No. SB-112-46, Part II. Compliance: Within 100 hours' time in service after 31 January 1977.