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/G1159/24 Amdt 2 Cabin Pressure Differential - Restriction 12/78 Applicability: All models with S/Nos. 001 to 229 and 775. Document: 1. Grumman Customer Bulletin No. 270A; or 2. FAA AD 78-14-06 Amendment 39-3313. Compliance: As per requirement document No. 1.