Primary finding
Probable cause
Failure and separation of the 90-degree gearbox as a result of the disengagement of the pinion and gear teeth. The cause(s) of the pinion and gear disengagement were undetermined.
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NTSB investigation record
LAX99LA283
CompletedBell Uh-1B· N999SJ
- Date
- August 25, 1999
- Location
- Lost Hills, CA
- Conditions
- VMC
- Record
- Completed
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