NTSB Identification: LAX90LA321.
The docket is stored on NTSB microfiche number 44596.
Accident occurred Wednesday, September 12, 1990 in NOVATO, CA
Probable Cause Approval Date: 02/12/1993
Aircraft: Brantly Helicopter B-2B, registration: N2159W
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

WHILE ON AN ADDED RATING FLIGHT TEST THE FAA DESIGNATED EXAMINER CALLED FOR A SIMULATED ENG FAILURE. THE PRIVATE PILOT APPLICANT IMMEDIATELY LOWERED THE COLLECTIVE AND BEGAN A 180 DEGREE TURN INTO THE WIND. WHEN THE HELICOPTER WAS ABOUT 160 DEGREES INTO THE TURN AND WAS ABOUT 50 FEET ABOVE THE GROUND THE PILOT BEGAN THE POWER RECOVERY BUT DUE TO THE HIGH SINK RATE THE SKIDS STRUCK THE SOFT DIRT OF A FRESHLY PLOWED FIELD CAUSING THE HELICOPTER TO ROLL TO THE RIGHT AND THE MAIN ROTOR BLADES TO STRIKE THE GROUND.

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

THE PILOT'S IMPROPER EXECUTION OF THE AUTOROTATION. CONTRIBUTING TO THIS ACCIDENT WAS THE EXCESSIVE SINK RATE AND MISJUDGING OF THE ALTITUDE.

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