Primary finding
Probable cause
The pilot's failure to maintain directional control during the landing roll.
Investigator assessment
Analysis narrative
The pilot reported that, during the landing roll, while attempting to arrest a developing ground loop, the airplane departed the runway onto grass. The airplane collided with a deep rut and spun around. The left wing dropped and contacted the ground, substantially damaging the left wing and left aileron. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.