Incident Overview
On the takeoff roll, the pilot's seat slid backward. This caused the aircraft to make an abrupt turn to the left while the pilot was attempting to move the seat back into its proper position. After an unsuccessful attempt to adjust the seat, the pilot retarded the throttle, and the aircraft came to a stop following a ground loop.
Post-Incident Inspection
Following the incident, the seats were inspected and found to be stiff and difficult to move fore and aft. The seat rails and latching mechanisms were also inspected, and no deficiencies were noted.
Event Sequence
The sequence began with the seat sliding back unexpectedly during takeoff. The pilot's subsequent efforts to reposition the seat coincided with a left turn that became uncontrolled. Throttle reduction and the ground loop ended the takeoff attempt.
Mechanical Assessment
The stiffness of the seat movement was identified but the inspection of the rail and latching systems revealed no mechanical faults. The exact reason for the seat sliding back was not determined from the available information.