Primary finding
Probable cause
Engine mount delamination and lack lubrication, causing the drive shaft to fail. Poor servicing of the helicopter was a related factor.
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NTSB investigation record
DEN91FA068
CompletedBell 206B-3· N717NH
- Date
- May 7, 1991
- Location
- Houston, TX
- Conditions
- VMC
- Record
- Completed
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