Primary finding
Probable cause
The pilot's inability to maintain control during an autorotational landing attempt following the failure of the main rotor drive train torsional coupling.
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NTSB investigation record
CHI89DEP04
CompletedHiller Uh-12E· N3829
- Date
- May 22, 1989
- Location
- Waterford, WI
- Conditions
- VMC
- Record
- Completed
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