Primary finding
Probable cause
Improper modification of the helicopter by the company/operator, and failure of the spray boom, which resulted in mast bumping, and subsequent failure of the main rotor assembly.
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NTSB investigation record
ATL89DKG06
CompletedBell Uh-1B· N840MC
- Date
- September 29, 1989
- Location
- Plains, GA
- Conditions
- VMC
- Record
- Completed
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