As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE TAIL ROTOR HAS HAD A PROBLEM OF GOING OUT OF BALANCE. THE FIRST TIME IT WENT OUT OF BALANCE HAD TO REMOVE WEIGHT FROM ONE OF THE TIPS OF THE BLADE. THE SECOND TIME HAD TO ADD WEIGHT TO THE BLADE OUT OF BALANCE. THE THIRD TIME THE T/R WENT OUT OF BALANCE HAD TO ADD MAXIMUM WEIGHT TO THE BLADE TIP. REPLACED TAIL ROTOR BLADE ASSEMBLY.