Primary finding
Probable cause
The pilot's improper planning/decision by operating and maneuvering the heliocpter in a regime where he could not maintain rotor rpm. The high density altitude and rough terrain were related factors.
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NTSB investigation record
SEA90LA135
CompletedHughes 369D· N58239
- Date
- July 13, 1990
- Location
- Toutle, WA
- Conditions
- VMC
- Record
- Completed
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