NTSB Identification: LAX94LA235.
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Accident occurred Thursday, June 02, 1994 in CHINO, CA
Probable Cause Approval Date: 11/14/1994
Aircraft: BELL 47D-1, registration: N14412
Injuries: 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.

The pilot reported that she lifted into a hover in preparation for takeoff and the helicopter began a pilot inducted oscillation due to heavy cyclic control forces. The pilot stated that she overcompensated on the controls and the helicopter rolled over. The pilot reported that during the run-up procedure she disengaged the hydraulic system to check the rotor tip path plane and forgot to reengage the system prior to lifting into a hover. The pilot said there was no mechanical malfunction or failure of any system.

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

loss of aircraft control due to the pilot's failure to correctly configure the hydraulic system prior to takeoff.

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