As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CARRYING OUT OPERATIONS ON THE AFTERNOON OF 10-23-97, PILOT REPORTED INCREASE OF VIBRATION WHILE IN-FLIGHT RETURNING TO LANDING SITE. AIRCRAFT WAS SHUT DOWN. ON EXAMINATION OF TAIL ROTOR, INSIDE PART OF TIP WAS FOUND MISSING. NO OTHER DAMAGE WAS APPARENT AND SUBSEQUENT TAIL ROTOR REPLACMENT AND BALANCING CURED PROBLEM. (X)