Primary finding
Probable cause
The pilot did not maintain rotor rpm after a compressor assembly blade failure. A related factor was an inadequate autorotation resulting in a hard landing.
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NTSB investigation record
SEA90LA137
CompletedSikorsky S-58Bt· N439DS
- Date
- July 16, 1990
- Location
- Ovando, MT
- Conditions
- VMC
- Record
- Completed
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