Accident Overview
Radar data indicated that the airplane was proceeding outbound for the procedure turn when the pilot reported trouble extending the landing gear. The pilot stated, "... we're trying to turn back in and do our gear here all at the same time." Shortly thereafter, the other pilot reported that the gear had been extended and that they had "three good, three green lights, so we're hoping the gear is down." The pilot also said, "we are now turned inbound." She was instructed to contact Unicom, which was the last recorded radio transmission from the flight.
Unicom Communication and Radar Tracking
The Unicom operator reported hearing the pilot say that they were "coming in." Radar data revealed that the airplane crossed the localizer at almost a 90-degree angle and continued turning right until it started to intercept the localizer. Subsequently, the airplane made a left turn away from the localizer that continued and terminated near the accident site. This turn was captured by six radar plots.
Detailed Radar Plots
The first plot showed the airplane had descended from 9,400 feet to 9,200 feet and its ground speed increased from 85 knots to 152 knots. The second plot showed altitude increased to 9,700 feet and ground speed decreased to 132 knots. The third plot showed altitude further increasing to 10,200 feet and ground speed dropping to 76 knots. The fourth plot showed the airplane had made almost a 180-degree turn and was at 8,900 feet with a ground speed of 120 knots. The fifth plot showed the airplane at 8,700 feet and 20 knots. The sixth and final plot showed the airplane at 8,400 feet and 38 knots.
Post-Accident Examination
An examination of the airplane revealed that both wing flap jackscrews were retracted and the landing gear actuators were extended. The landing gear control switch was in the down position and the emergency gear extension knob was pulled out to full travel. Reduced visibility and clouds were present in the vicinity of the airport at the time of the accident.
Probable Cause
The official probable cause was the pilot's loss of situational awareness while maneuvering in adverse weather conditions, resulting in spatial disorientation.