N5013F
BELL 206L-1
WHILE IN CRUISE FLT, TOTAL PWR LOSS WAS EXPERIENCED. PLT SETUP AUTOROTATIVE WATER LANDING, DEPLOYED EMERGENCY FLOATS. RIGHT FLOAT WAS NOT FULLY INFLATED BY WATER TOUCHDOWN, ACFT ROLLED RIGHT TO INVERTED POSITION. ENG TEARDOWN REVEALED CARBON BUILDUP BETWEEN TURBINE-TO-COMPRESSOR COUPLING AND TURBINE INNER SHAFT, CAUSING FRICTIONAL OVERHEAT LEADING TO SHAFT FAILURE.
Source: NTSB Aviation Accident Database
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