COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Schweizer (Hughes) 269 Series Helicopters AD/HU 269/21 Amdt 3 Main Rotor Blades - Inspection 1/78 Applicability: All models fitted with main rotor blades P/Nos. 269A1125, 269A1131, 269A1131-1, 269B1145, 269B1145-1 and 259B1145-25. Document: Hughes SIN No. N-9.2. Compliance: 1. Initial inspection as per requirement document except those blades previously inspected to AD/HU 269/21B. 2. Recurring inspection as per requirement document.