Primary finding
Probable cause
Fatigue failure of the 90-degree gearbox attachment studs, resulting in separation of the tailrotor and 90-degree gearbox from the vertical fin.
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NTSB investigation record
SEA99LA171
CompletedGarlick Uh-1H· N32800
- Date
- September 21, 1999
- Location
- Usk, WA
- Conditions
- VMC
- Record
- Completed
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