Accident Overview
An unplanned stop was made at an airport due to a sick passenger. Approximately 30 minutes later, the pilot departed. The density altitude at the airport was later computed to be 6,572 feet.
Flight and Impact
After takeoff, the airplane was observed entering a right crosswind turn. It then abruptly rolled and pitched downward, reportedly maintaining a nose-down attitude until colliding with terrain.
Aircraft Information
Investigation found no preimpact mechanical failure. The airplane was originally fabric-covered but had been metalized. Its engine had been derated from 160 to 150 horsepower. The propeller had been repitched; however, impact and ground fire damage precluded measurement of blade pitch angles.
Airport Conditions
According to the NOAA Airport/Facility Directory, airport remarks noted the possibility of unusual air currents in the vicinity. Runway 05-23 exhibited a variable gradient, with the terrain at the departure end of runway 05 dropping and then rising.
Pilot Information
The pilot had received his private pilot certificate on February 18, 1997.
Undetermined Factors
The investigation did not determine whether the pilot had leaned the mixture for takeoff in high density altitude. Additionally, the takeoff gross weight of the airplane was not determined.