The pilot reported that, during landing, as the main landing gear touched down, he "felt like [the airplane] hit a[n] uneven section of the runway" and began to porpoise. The pilot was able to remedy the porpoise by using back pressure and he taxied the airplane to the ramp without further incident. Subsequently, the airplane sustained substantial damage to the fuselage.

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