NEWMAN LAKE, WA, USA
N45684
BENSON B8M
WITNESSES OBSERVED THE AIRCRAFT GO THROUGH A SERIES OF RAPID PITCH OSCILLATIONS AT ABOUT 300 FT AGL. THE PITCH CHANGES INCREASED IN MAGNITUDE AND SEVERITY UNTIL THE MAIN ROTOR BLADES STRUCK THE RUDDER STOPPING IT'S ROTATION AND RESULTING IN AN UNCONTROLLED NEAR VERTICAL DESCENT. THERE WAS NO SOLO ENDORSEMENT ON THE STUDENT'S CERTIFICATE.
Source: NTSB Aviation Accident Database
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