COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 212 Series Helicopters AD/BELL 212/6 Main Rotor Blade - Removal From Service 2/76 Applicability: All models. Requirement: Remove from service main rotor blades having the following S/Nos.: A2-03642, A2-3643, A2-03646, A2-27872, A2-27961, A2-27963, A2-27967 A2-27968, A2-27982, A2-28015, A2-28016, A2-28019, A2-28020, A2-28023, A2-28195, A2-28198, A2-28211, A2-29315, A2-29325, A2-29334, A2-29915, A2-29919 and A2-29920. Compliance: Before further flight after 16 January 1976.