Primary finding
Probable cause
Separation of the 90 degree gearbox after fatigue failure of the gearbox attach bolts. Factors include hilly/mountainous terrain.
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NTSB investigation record
SEA93LA207
CompletedBell Uh-1B· N3979C
- Date
- September 23, 1993
- Location
- Pierce, ID
- Conditions
- VMC
- Record
- Completed
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