GALVESTON, TX, USA
N3910U
BELL 412
THE ACFT LANDED HARD IN THE GULF OF MEXICO DURING AN AUTOROTATION THAT WAS ENTERED FOLLOWING THE SEPARATION OF THE 90 DEGREE GEARBOX. THE GEARBOX (WITH TAIL ROTOR BLADES) SEPARATED DUE TO AN IMBALANCE. HOWEVER, THE GEARBOX WAS NOT RECOVERED DURING THE INVESTIGATION AND THE CAUSE OF THE IMBALANCE COULD NOT BE DETERMINED.
Source: NTSB Aviation Accident Database
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