COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Frakes (Grumman) G73 Series Aeroplanes AD/G73/21 Consolidation of Previously Issued Airworthiness Directives 9/83 Applicability: All G73 Models. Document: Grumman Service Bulletins Nos. 1, 3, 6, 10, 12, 18, 20, 23, 24 and Grumman Customer Bulletins G73-3, -4, -5, -27, -29, -43, -46, -66, -71, -83, -88. Compliance: Prior to issue of Certificate of Airworthiness. Background: To reduce operators administrative workload, the requirements for initial modification and one time inspections have been consolidated above.