NTSB Identification: CHI06CA221.
The docket is stored in the Docket Management System (DMS). Please contact Records Management Division
Accident occurred Monday, July 31, 2006 in Springfield, MN
Probable Cause Approval Date: 11/29/2006
Aircraft: Air Tractor AT-400, registration: N23720
Injuries: 1 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The airplane ground looped following a failure of one of the tail wheel bolts. The pilot reported that he was landing at a private grass airstrip when the accident occurred. He reported that upon landing the tail wheel broke and the airplane ground looped. Inspection of the airplane revealed that it traveled into a bean field during the ground loop and that the bottom bolt on the tail wheel assembly fractured which resulted in a loss of directional control.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The pilot's inability to maintain directional control of the airplane as a result of the partial failure of the tail wheel assembly. A factor associated with the accident was the crop that the airplane contacted.

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