What happened
An ATP rated flight instructor was conducting a rental checkout for a private pilot. During the flight, the check pilot instructed the student pilot to perform a landing and, if enough runway remained, to execute another takeoff.
The landing was completed on runway 8R, which is an asphalt runway measuring 4,100 by 75 feet. Throughout the landing process, the check pilot had been following through on the controls. However, during the landing roll, the instructor released the controls to wait for the student pilot to bring the aircraft to a stop.
Immediately after the instructor removed his hands from the controls, the control stick moved forward and an increase in engine speed was heard. The aircraft then swerved to the left. Although the check pilot took control of the aircraft to attempt to correct the swerve, the maneuver was unsuccessful. The aircraft subsequently struck a snow drift located on the left side of the runway, resulting in a nose-over.