NTSB Identification: CHI88DCA01.
The docket is stored on NTSB microfiche number 35550.
Accident occurred Thursday, March 10, 1988 in CAHOKIA, IL
Probable Cause Approval Date: 03/30/1989
Aircraft: BELL 206B, registration: N13Q
Injuries: 2 Uninjured.

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%.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FLIGHT CONTROLS..IMPROPER USE OF..DUAL STUDENT

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

DIRECTIONAL CONTROL..NOT MAINTAINED..DUAL STUDENT

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

SUPERVISION..INADEQUATE..PILOT IN COMMAND(CFI)


Contributing Factors

OBJECT..VEHICLE

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