Primary finding
Probable cause
The loss of engine power due to a #21 bearing failure. The bearing failed as a result of inadequate maintenance. A factor in the accident was the pilot operating the helicopter within the avoid operating envelope.
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NTSB investigation record
ATL90LA042
CompletedBell Th-1· N106SR
- Date
- December 20, 1989
- Location
- Creola, AL
- Conditions
- VMC
- Record
- Completed
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