The flight instructor reported that, during the student pilot's solo flight in the traffic pattern, after completing a series of takeoffs and landings, the student decided to practice a soft field takeoff. During the takeoff, the student applied back pressure and full throttle; however, he did not add sufficient right rudder. Subsequently, the airplane veered off the runway to the left, struck the Precision Approach Path Indicator lights, and came to rest off the runway.

The airplane sustained substantial damage to the fuselage and engine mount.

The flight instructor reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.