ERA09FA377 · Cessna 400

The instrument-rated private pilot, departed the airport on an instrument flight rules (IFR) flight plan under daytime instrument meteorological conditions (IMC) with overcast clouds 800 feet (ft) above ground level. The airport elevation was 828 feet mean sea level (msl). Radar data showed the airplane climbed to an altitude of 1,500 ft mean sea level (msl), before initiating a right-hand turn as the pilot had been instructed. The pilot's communications with air traffic control were routine until he failed to acknowledge the controller's instruction to continue the turn and to climb to 5,000 ft msl. Radar data showed that the airplane climbed to 2,300 ft msl, turned left, and started to descend. Radar contact was lost after the plane descended below 2,200 ft msl. The airplane struck trees 3.5 miles south of the airport at an elevation of 850 ft msl, and was in a left wing low 50 degree nose down pitch attitude during the impact sequence. A postaccident examination of the airplane and engine revealed no anomalies that would have precluded normal operation, and the propeller showed impact damage consistent with operating at high power. Based on the observed weather in the area, the pilot would have been in IMC shortly after initiating his right-hand turn. The IMC flight conditions, radar track, power settings, and impact attitude are consistent with the pilot experiencing spatial disorientation.

Verbatim NTSB analysis and probable cause from the NTSB dataset