COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 205 Series Helicopters AD/BELL 205/60 Tail Rotor Driveshaft Hangar Bearings 1/92 Applicability: All models 205A and 205A-1 fitted with tail rotor driveshaft bearings P/N 204-040- 623-003 with S/N prefixed with either "T" or "N" prior to N4000 and all -005 bearings with a S/N prefix "T" or "N". Requirement: Action in accordance with Bell Alert Service Bulletin 205-91-43 Revision A. Note: FAA Priority Letter AD 91-24-16 refers. Compliance: Daily before first flight of the day after 12 January 1992. Background: A daily inspection of the tail rotor driveshaft bearings has been found necessary following a fatal accident which revealed the possibility of a production batch problem with these bearings.