Flight Background
At 1900, the pilot encountered thunderstorm activity. The left fuel gauge was inoperative, and the aircraft had no communication equipment. Only one navigation receiver was operative, and there were no instrument lights or a slaved directional gyro available. As darkness fell, the pilot was unable to see the instrument panel and noticed that the 10-amp circuit breaker had popped.
Approach and Landing
During a precautionary landing at Lincoln County Airport, the pilot could not activate the runway lights because he had no radio transmitter. With no electrical power, he was also unable to use the landing light. The first approach attempt was from north to south, and the last approach attempt was from south to north. The aircraft struck rolling terrain approximately 1 mile south of the runway.
Post-Accident Inspection
A laboratory evaluation of both voltage regulators showed they operated within the manufacturer's rated performance.