As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) TAIL ROTOR FORK ASSEMBLY NUT TABWASHER FAILED ALLOWING THE NUT TO WORK LOOSE. AIRCRAFT THEN SUFFERED A LOSS OF TAIL ROTOR CONTROL WHICH RESULTED IN A FORCED LANDING WITH MINOR AIRCRAFT DAMAGE. INVESTIGATION FOUND A BROKEN INTERNAL TAB ON THE TABWASHER.(OTHER CAUSE: UNKNOWN ) (CASA NR 510002066)