Pilot Report
The pilot had flown three circuits in the traffic pattern before landing and shutting the engine down to await hot air balloon traffic departing the area. After the balloons departed, the pilot initiated a fourth pattern. On final approach, approximately halfway down, the pilot heard a sound described as 'between a bang and a thump.' The aircraft attempted to pitch up, so the pilot pushed the nose down, avoiding throttle adjustment to prevent further pitch-up. The pilot lost altitude and struck the nose gear on the end of the runway. The aircraft skidded down the runway on its nose, producing sparks that led to flames. The pilot reported that the engine had been running great and sounded normal before the event.
Witness Observations
A witness observed the aircraft waiting for the balloons and then completing a fourth pattern. On final approach, the witness heard a loud 'pop' or 'pow' noise. Immediately after, the aircraft descended abruptly, like 'someone dropping a ball.' Flames were seen coming from the cowlings while the aircraft was still airborne. Upon touchdown, the nose wheel popped back, and the airplane slid a short distance on its nose with the tail elevated. Flames then emerged from underneath and around the cabin.
Investigation Findings
Extensive fire damage precluded determination of the origin of the fire or what initiated it. No further analysis is available from the source.