Incident Overview
During a training flight, the landing rollout was disrupted when the student pilot applied violent pressure to the right brake. This action caused the aircraft's nose to swing approximately 70 degrees to the right, initiating a skid toward the right side of the runway.
Sequence of Events
The instructor reported that upon observing the skid, he immediately took control of the airplane. However, the student maintained his feet on the brakes, preventing effective recovery. The aircraft subsequently collided with a runway sign, resulting in substantial damage.
Student Statement
The student stated that it was possible he had been using only the right brake to stop the aircraft. He noted that upon brake application, the aircraft began skidding. He then transferred controls to the instructor, but the aircraft was traveling too fast and exited the runway into the grass, where one wing struck a sign.
Postaccident Examination
Postaccident examinations of the aircraft's steering and brake systems did not reveal any abnormalities to the aircraft or its systems prior to the accident.