CAHOKIA, IL, USA
N13Q
BELL 206B
THE INSTRUCTOR WAS GIVING A PILOT AN EMPLOYMENT EVALUATION IN THE HELICOPTER WHEN DURING THE STARTUP THE PILOT PREMATURELY ADDED FULL POWER CAUSING THE HELICOPTER TO ROTATE RAPIDLY TO THE RIGHT. THE HELICOPTER HAD BEEN POSITIONED ON A TRAILER. DURING THE UNCONTROLLED ROTATION IT STRUCK A TRACTOR, ATTACHED TO THE TRAILER, WITH THE TAIL ROTOR. THE HELICOPTER CAME TO REST A FEW FEET FROM THE TRAILER AFTER THE MAIN ROTOR ASSEMBLY BROKE AWAY FROM THE HELICOPTER. THE TORQUE GAUGE IN THE HELICOPTER INDICATED IN EXCESS OF 100%.
Source: NTSB Aviation Accident Database
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