Overview
During an instrument landing system (ILS) approach near the middle marker, an airplane collided with the tops of trees. The accident occurred when the aircraft descended into a wooded area along the approach path. Examination of the crash site did not reveal any pre-impact airframe or engine anomalies that would have prevented normal flight.
Witness Observations
Witnesses reported hearing the airplane strike the trees, followed by a distinctive "whop, whop, whop sound" as the aircraft continued flying. Other witnesses observed the airplane following a curved, descending flight path until it impacted the ground. Visibility at the airport was reported as 1/2 mile at the time of the accident.
Examination of the Accident Site
Investigators found a section of the right propeller and other pieces of the airframe along the approach path, consistent with an initial impact with trees. The trees in the area ranged from approximately 30 to 60 feet in height. The tops of the taller trees were either broken or showed fresh cut marks on their limbs, indicating contact with the aircraft.
Pilot Toxicology
A toxicology test of the pilot revealed a blood alcohol level of 216 mg/dL (milligrams per deciliter, also reported as mg/hg).
Probable Cause
According to the official investigation, the probable cause of the accident was the pilot's descent below the decision height for the instrument approach.