NTSB Identification: LAX97LA068.
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Accident occurred Saturday, December 14, 1996 in LAKEPORT, CA
Probable Cause Approval Date: 09/30/1997
Aircraft: Robinson R22 BETA, registration: N8311A
Injuries: 1 Minor,1 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.

According to the flight instructor (CFI), seconds before the crash, both he and his student were handling the flight controls. The CFI indicated that he had been instructing his student how to hover in ground effect when the student abruptly over controlled. The CFI took the controls from his student a 'little bit too late to correct' the student's control inputs. The main rotor blades struck the ground, and the helicopter rolled over. The CFI further reported that the ground adjacent to the crash site sloped slightly upward, and he had misjudged the location of the horizon. The CFI had been a rotorcraft flight instructor for about 2 weeks.

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

inadequate supervision by the flight instructor (CFI), and his delayed corrective action to the student pilot's abrupt control inputs, thereby allowing the main rotor blades to strike the ground. Factors relating to the accident were: the CFI's lack of instructing experience and the presence of upsloping terrain.

Full narrative available

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