Primary finding
Probable cause
In-flight separation of a main rotor blade due to fatigue failure of the main rotor blade spar, which originated at a manufacturing induced scratch (tool mark) that was the result of inadequate quality control.
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NTSB investigation record
NYC90MA009
CompletedAgusta A109A mkii· N21FL
- Date
- October 10, 1989
- Location
- Lacey Township, NJ
- Conditions
- VMC
- Record
- Completed
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