As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PRE-FLIGHT INSPECTION FOR A MAINTENANCE INDUCTION CHECK FLIGHT, FOUND PLAY IN THE TAIL ROTOR OUTPUT FLANGE. GROUNDED AIRCRAFT. REMOVED TAIL ROTOR OUTPUT FLANGE NUT FROM MAIN GEARBOX, AND FOUND THE LOCKING TABS BROKEN OFF OF THE NUT.