Incident Overview
During the takeoff roll, with approximately 1,400 feet of runway remaining, the pilot noticed that there was no indication of airspeed. He therefore elected to abort the takeoff. The runway was a combination of asphalt and turf. Following his decision to abort, the remaining portion of the runway was turf, which was still damp from the morning dew. He was unable to stop on the remaining runway. After overrunning the runway, the aircraft hit an irrigation ditch and nosed over.
Post-Accident Examination
A post-accident examination revealed insect larvae imbedded in the pitot tube, about 1/8 inch from the tube's end. According to the pilot, the aircraft had been parked outside and had not been flown for approximately 70 days prior to the accident flight. He further related that he noticed nothing abnormal about the pitot system during his preflight inspection.