Pre-Flight and Departure
Before departure, the pilot was heard performing an engine run-up. The flight then departed with full fuel tanks. According to witnesses, the airplane climbed to about 200-300 feet above ground level.
Witness Observations
A witness near the crash site observed black smoke trailing from the engine area. Another witness reported hearing the engine backfiring and sputtering.
Accident Sequence
The airplane collided with trees and then the ground while descending. A post-crash fire occurred.
Post-Accident Examination
Examination of the engine compartment revealed severe fire damage to the firewall adjacent to the two electric fuel pumps and the gascolator. However, no evidence of pre-impact internal engine failure or malfunction was found. The examination also revealed that the number one cylinder baffle tube had failed circumferentially along a weld at the end plate of the muffler, with evidence of stress corrosion cracking.
Toxicology
Carbon monoxide was detected in the pilot and two of the passengers. No evidence of soot deposition or burning of the larynx was noted in any of the five occupants.