No fatalities

AIR TRACTOR INC AT-301 accident at Circle, MT, 7 Aug 2022

Circle, MT, United States

On August 7, 2022, an AIR TRACTOR INC AT-301 operated by HARRIS SPRAYING INC was involved in an aviation accident near Circle, MT. No fatalities were reported. Investigators recorded the probable cause as: The loss of engine power due to carburetor ice. Contributing to the accident was the pilot’s failure to use carburetor heat. This summary draws on records from NTSB; 12 related events involving the same aircraft type or operator are linked below.

SourcesNTSBPrimary reportUpdated 2026-08-03Data APIEditorial standards

Probable cause

The loss of engine power due to carburetor ice. Contributing to the accident was the pilot’s failure to use carburetor heat.

— NTSB Determination

Contributing factors

Fuel control/carburetorContributed to outcomePilot