STERLING, MA, USA
N9069G
ROBINSON R22A
THE ACCIDENT OCCURRED WHEN THE CFI ALLOWED THE STUDENT WHO WAS IN A HOVER MANEUVER TO LOSE ROTOR RPM. THE HELICOPTER DRIFT REARWARD, THE LEFT REAR SKID DUG INTO THE GROUND AND THE HELICOPTER ROLLED OVER. RPM DECAYED SO BADLY THAT THE HELICOPTER COULD NOT RESPOND TO RECOVERY CONTROL INPUTS.
Source: NTSB Aviation Accident Database
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