IRVINE, CA, USA
N9070N
ROBINSON R22
DURING AN INSTRUCTIONAL LESSON THE CFI DEMONSTRATED AUTOROTATION TO HIS STUDENT. THE CFI INDICATED THAT HE PLANNED TO LAND IN AN ESTABLISHED LANDING ZONE. HOWEVER, UPON RECOGNIZING THE HELICOPTER WOULD NOT REACH THE DESIRED LOCATION THE CFI DECIDED TO STOP THE DESCENT. THE CFI FURTHER REPORTED THAT HE RAISED THE COLLECTIVE WHICH INDUCED A LOW ROTOR RPM SITUATION. THERE WAS INSUFFICIENT ALTITUDE TO RECOVER AND THE HELICOPTER TOUCHED DOWN HARD.
THE CFI'S FAILURE TO MAINTAIN ROTOR RPM DURING THE PRACTICE AUTOROTATION.
Source: NTSB Aviation Accident Database
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