Primary finding
Probable cause
the failure of the 90 degree gearbox for reasons undetermined. Factors were the failure of the gearbox, and it not being possible for the pilot to maintain control of the aircraft.
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NTSB investigation record
CHI99LA012
CompletedHiller Uh-12C· N9739C
- Date
- October 24, 1998
- Location
- Clinton, IA
- Conditions
- VMC
- Record
- Completed
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