Accident Overview
An airplane conducting an ILS approach at night and in instrument meteorological conditions (IMC) collided with trees in mountainous terrain before reaching the initial approach fix (IAF). The missed approach altitude prior to the IAF was 10,600 feet, and the descent altitude at the outer marker was 7,713 feet. Wreckage was located under the localizer path at an elevation of 7,600 feet.
Wreckage Distribution
Damage to treetops along the wreckage distribution path indicated that the airplane traveled through the trees on a level plane until contacting the ground approximately 300 feet into the path.
Weather Conditions
At the time of the accident, light snow was falling and visibility was deteriorating due to fog.
Mechanical Investigation
Post-crash investigation found no evidence of a mechanical failure or malfunction.
Probable Cause
The official probable cause was the pilot's failure to follow the IFR procedure by not maintaining the proper altitude prior to the initial approach fix. Factors included dark night conditions and a low ceiling.