Primary finding
Probable cause
Fatigue failure of all four attachment studs of the tailrotor gearbox resulting in separation of the gear box, and inadequate maintenance inspection.
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NTSB investigation record
SEA90LA010
CompletedHughes 369D· N9163F
- Date
- October 27, 1989
- Location
- Neah Bay, WA
- Conditions
- VMC
- Record
- Completed
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