N1070D
BELL 206L-1
PILOT APPROACHING LANDING PLATFORM HEARD A LOUD BANG AND AUTOROTATED TO WATER. AIRCRAFT ROLLED INVERTED AND WAS DAMAGED BY WAVES BANGING IT AGAINST PLATFORM. A TEARDOWN OF THE ENGINE REVEALED THAT THE FIRST STAGE TURBINE WHEEL, PN 6895801G, HAD FAILED AND EXITED THE CASE. THE WHEEL FAILED FROM LOW CYCLE THERMAL FATIGUE WHICH ORIGINATED IN THE RIM AREA.
Source: NTSB Aviation Accident Database
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