Final
None
Jul 26, 2024
N793SF accident at Oktaha, OK
Bell 407 — Uncontained engine failure at Oktaha, OK
DateJul 26, 2024
Tail numberN793SF
AircraftBell 407 · B407
LocationOktaha, OK
Phase of flightEmergency Descent
OperationPart 135 Positioning
InjuriesNone
NTSB caseENG24LA028
Probable cause
The loss of engine power due to high cycle fatigue failure of a power turbine stage 3 turbine wheel blade. The resulting engine imbalance caused a decoupling of the gas producer stage 1 and stage 2 turbine wheels leading to a stage 1 turbine overspeed and subsequent turbine wheel burst.
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