Primary finding
Probable cause
The mechanic's failure to assemble the tail rotor drive shaft correctly and the subsequent failure of the tail rotor drive shaft. A factor was the lack of inspection procedures for offshore maintenance.
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NTSB investigation record
FTW91IA143
CompletedBell 412· N177EH
- Date
- August 8, 1991
- Location
- Rowan Midland,
- Conditions
- VMC
- Record
- Completed
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