Primary finding
Probable cause
The pilot's failure to maintain directional control of the airplane during the landing roll resulting in collision with taxiway sign.
Investigator assessment
Analysis narrative
The Certified Flight Instructor reported that, while practicing stop-and-go landings with his student, the airplane touched down hard and immediately veered left. The pilot attempted to correct with opposite rudder; however, the airplane continued off the runway and hit a taxiway sign with the left wing and landing gear struts. The airplane sustained substantial damage to the left-wing strut. The pilot reported to the duty officer that there were no preimpact mechanical malfunctions or failures that would have precluded normal operation.