COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Bell Helicopter Textron 47 (All Variants) Series Helicopters
AD/BELL 47/59 Main Rotor Blades 10/65
All model 47 series with metal main rotor blades.
Carry out a visual inspection for cracking of the upper and lower surfaces of the main rotor blades adjacent to the outboard extremity of the root reinforcement doublers at the trailing edge.
Before 1500 hours blade time in service and thereafter at intervals not exceeding 100 hours time in service.