Primary finding
Probable cause
Fatigue failure of the tail rotor 42 degree gear box due to pilot induced overstress. Navy data and FAA type certificate limitations were not adhered to.
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NTSB investigation record
SEA89FA111
CompletedOregon helicopters Uh-1L· N157LC
- Date
- June 14, 1989
- Location
- Baring, WA
- Conditions
- VMC
- Record
- Completed
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