Primary finding
Probable cause
The inadequate maintenance inspection of the helicopter resulting in loss of lubrication from the main drive shaft going undetected until failure of the drive shaft.
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NTSB investigation record
MIA97TA139
CompletedBell 204-b· N4580Y
- Date
- April 16, 1997
- Location
- Calderwood, TN
- Conditions
- VMC
- Record
- Completed
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