Primary finding
Probable cause
A main rotor flight control bolt (part number 20-057-6-38d) came out of its rod end bearing while in flight due to the bolt being improperly torqued during maintenance.
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NTSB investigation record
ANC89FA069
CompletedBell 412· N524EH
- Date
- May 6, 1989
- Location
- Girdwood, AK
- Conditions
- VMC
- Record
- Completed
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