Flight History
The flight was inbound to MTN when an electrical power event occurred and communication with air traffic control (ATC) was lost. The pilot proceeded to MTN, entered the traffic pattern, and attempted to land on runway 14. According to the pilot, the engine lost power while the aircraft was on base leg, and the airplane crashed less than a mile from the runway.
A passenger reported that the pilot turned left to avoid another aircraft just before the engine lost power. During the turn, the airplane shook.
ATC personnel at MTN stated that they first noticed the accident airplane when it was on base leg. Another airplane had been cleared to land, and its pilot was instructed to break off the approach. ATC then observed the accident airplane cross the final approach course, turn left, and descend to the ground.
Examination
An examination of the airplane revealed that the alternator belt had failed, though it could not be determined whether the failure occurred before or after impact. The alternator itself was damaged and was not tested. The alternator warning circuitry for the annunciator panel was found to be defective, which disabled the warning system.
A mechanical examination of the airframe and engine did not disclose evidence of mechanical malfunction.