COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Hiller UH-12 Series Helicopters AD/HILLER 12/1 Main Rotor Blade - Inspection 10/60 Applicability: All models fitted with main rotor blades P/No. 2253-1101-03 with 250 or more hours time in service. Document: 1. Hiller SIL No. 3007; or 2. FAA AD 60-17-2. Compliance: At each daily or overnight inspection after 7 October 1970.