NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The commercial pilot reported that he was practicing aerobatics in the experimental, amateur-built biplane over a river. During the maneuvers, as he input left aileron, the control stick was stiff, and he believed he observed abnormal movement of the upper left aileron. He then applied more force to free the control stick and input right aileron; however, the airplane rolled left and entered a spin. The pilot was unable to recover from the spin and subsequently parachuted from the airplane. The airplane came to rest at the bottom of the river.
Examination of the recovered wreckage revealed that most of the left wings’ parts, including the ailerons and aileron control tubes, were not recovered. As such, control continuity could not be verified or tested.