COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters AD/HU 369/5 Main Rotor Blade - Inspection 6/70 Applicability: All models fitted with main rotor blades P/N 369A1100-501 with S/Nos. as listed in Hughes SIN No./ HN-8. Document: Hughes SIN No. HN-8. Compliance: Before 1 September 1971.