Incident
Shortly after reaching a cruising altitude of 9,500 feet, the aircraft's course changed from southeasterly to southwesterly, as observed on radar. During this track change, its average ground speed decreased from 170 knots to 108 knots. The pilot contacted air traffic control (ATC) with his call sign, and about five seconds later, a one-second-long unintelligible transmission was heard. At the same time, radar showed the aircraft at 8,800 feet. Radar and radio contact were lost shortly thereafter.
Wreckage Discovery
Three days later, wreckage was found at the crash site, which was located at an elevation of 1,820 feet above sea level and one-half mile south-southwest of the aircraft's last observed radar position. The average descent angle from the 8,800-foot altitude to the crash site was approximately 51 degrees.
Damage and Examination
The aircraft was extensively damaged during impact. No damage was observed on the tall trees surrounding the accident site. An examination found no preimpact mechanical malfunction or failure of the aircraft or its engines. Additionally, no pre-accident impairment of the pilot was detected.
Probable Cause
According to the official investigation, the probable cause was loss of aircraft control for undetermined reason(s).