NTSB Identification: LAX96LA346.
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Accident occurred Monday, September 30, 1996 in FILLMORE, CA
Probable Cause Approval Date: 09/30/1997
Aircraft: Bell 206B, registration: N59576
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.

According to the flight instructor (CFI), he and the student pilot were on an instructional flight, and the student was performing hovering autorotations to a clear, moist, sandy area of a river bed. The CFI reported that the student began an autorotation from a 3-foot hover when, about 1 foot above the ground, the helicopter began to drift to the left. The CFI took the controls and applied right cyclic as the rotor rpm continued to decay. His control input did not stop the helicopter's accelerating leftward movement. As the left skid touched down on sandy terrain, the helicopter experienced a dynamic rollover and rolled onto its left side. The wind at the accident site was estimated to be westerly at about 10 knots.

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

the flight instructor's inadequate supervision and delay in taking remedial action to stop the aircraft's lateral movement, which resulted in a dynamic rollover after touchdown.

Full narrative available

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