Incident Overview
During a night climb through 19,000 feet, the crew of a twin-engine aircraft observed the #2 generator warning light illuminate. They noted that the generator was producing no output and could not be reset. A check of the #1 generator showed a voltage between 14 and 15 volts. The crew reduced the electrical load, but approximately five minutes later, the batteries became completely discharged, resulting in a total loss of electrical power.
Diversion and Landing
Using a flashlight for illumination, the crew diverted to Chester County Airport, which has a 4,600-foot runway. The landing gear was extended using the emergency extension system. The elevator trim was inoperative, requiring both pilots to apply back pressure on the yoke to counteract a nose-down tendency. The aircraft touched down about one-quarter of the way down the runway. The crew attempted to use the thrust reversers, but they were inoperative. Subsequently, the aircraft continued off the side and beyond the end of the runway, striking a wooden beam and a snowbank before coming to rest in a ditch.
Systems Affected by Electrical Failure
With the total loss of electrical power, the following systems were also inoperative: wing flaps, anti-skid brakes, the captain's airspeed indicator and altimeter, nosewheel steering, and cockpit lighting.
Investigation Findings
An investigation revealed a shaft failure of the #2 generator (starter/generator) and worn brushes in the #1 generator.