COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters AD/BELL206/121 Tail Rotor Blade Assembly 9/90 TX Applicability: All models. Requirement: 1. Determine the part number and serial number of the tail rotor blade assembly installed on the helicopter. 2. If the tail rotor blade assembly installed is P/N 206-016-201-113 or P/N 206-016- 201-127 and is identified with any serial number listed below, remove and replace the blade assembly. Serial Numbers: T-41361 T-41627 T-41725 T-41737 T-42088 T-42127 T-42157 T-42307 T-42311 T-42316 T-42494 T-42496 T-42497 T-42502 T-42523 T-42534 T-43276 T-44089 T-44120 T-44157 T-44174 T -44222 T-44300 T-44638 Note: FAA Emergency AD 90-13-01 refers. Compliance: Prior to further flight after 26 June 1990. Background: The FAA has listed the blades above as being life expired. They may have been represented as airworthy newly overhauled blades using falsified documentation.