As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL ROTOR BOLT SHEARED IN-FLIGHT CAUSING SEVERE VIBRATION. LANDING MADE WITHOUT DAMAGE. BELIEVE BOLT FAILED DUE TO CORROSION/RUST SETTING UP STRESS POINTS. SUBMITTER RECOMMENDED INSPECTION EVERY 100 HOURS. BOLT WAS LAST INSPECTED 168.3 HOURS PREVIOUSLY.