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Witnesses at the airport reported that the fully aerobatic biplane impacted the infield area between runway 21 and the parallel taxiway in a near level attitude at a high rate of speed while recovering from a spin. Prior to the accident, the biplane had been performing an aerobatic routine for 12 to 15 minutes. The airplane made a high speed pass across the field from west to east at an estimated altitude of 200 feet AGL, followed by a near vertical climb to approximately 2,000 feet AGL. At that point the airplane was observed rolling inverted while on a westerly heading. The airplane was then observed rolling to the upright position, immediately performing a snap roll to the right, and then entering a spin. One of the witnesses, an aerobatic judge who was not judging the airshow, stated that 'the pilot entered a snap roll maneuver with insufficient airspeed.' Witnesses reported that the engine was operating at a high power setting and the propeller was turning during the airplane's descent. Examination of the airframe by the FAA inspectors at the site did not disclose any evidence of pre-impact mechanical failure or malfunction.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:

The pilot's loss of control while performing aerobatics resulting in an inadvertent stall/spin. A factor was the lack of altitude available for recovery.