Flight Sequence
The pilot returned from a flight and subsequently took off again using runway 28L. After departure, the aircraft turned to the southeast.
Witness Account
A witness located southeast of the airport reported seeing the aircraft at a low altitude, estimated between 100 and 200 feet, flying in his direction. The witness noted no other indication of a problem until the aircraft executed a very sharp banking turn to the left and reversed direction back toward the airport. Immediately after the turn was completed, the engine sputtered, and the aircraft suddenly entered a steep descent.
Accident and Impact
The aircraft crashed near the approach end of runway 28L. Prior to ground impact, it struck power lines, causing a power outage in the area.
Post-Crash Examination
Examination of the aircraft's fuel system revealed that it was configured for both tanks to feed. One fuel tank was found empty, while the other contained approximately 5 gallons remaining. However, the amount of fuel that may have leaked after the crash was not verified. An engine tear-down showed no indication of a preimpact mechanical failure. The carburetor heat was found in the 'off' position.
Environmental Conditions
The temperature and dew point were 47°F and 45°F, respectively. Icing probability charts indicated that serious carburetor icing could have occurred while at a cruise or glide power setting.