What happened
On November 8, 2012, at approximately 19:00, a Cessna 206H aircraft, registration OH-AAA, crashed into trees and the ground in a peat production area near Kyyrönsuo, Kontiolahti. The flight was a cross-country mission from Joensubi airport to Lappeenranta.
During the evening, heavy snow was falling at Joensuu airport. As the departure approached, weather conditions deteriorated significantly. To avoid the worsening weather, the pilot decided to expedite the takeoff and cancelled a planned refueling stop. While the initial takeoff from runway 10 met the requirements for a special VFR clearance, the en-route weather conditions did not meet the minimum requirements for night VFR flight, as visibility was predicted to be much lower than the necessary 8,000 meters.
Shortly after takeoff, the pilot began a right-hand turn toward Lappeenranta. During this maneuver at low altitude, the pilot lost spatial orientation and control of the aircraft due to heavy snowfall and insufficient horizontal visibility. An eyewitness reported seeing the aircraft flying at an extremely low level before hearing a collision. The pilot perished in the accident.
The investigation
The investigation focused on the aircraft's technical airworthiness, the impact of meteorological conditions, and human factors. Investigators found no technical defects in the aircraft prior to the accident. The investigation also examined the pilot's decision-making process regarding the deteriorating weather and the impact of potential aircraft icing.
Findings
- The root cause of the accident was the pilot's decision to fly in meteorological conditions that exceeded his personal limits of skill and capability.
- The direct cause was likely the loss of control and spatial disorientation during a low-altitude turn in heavy snow.
- The pilot's ability to assess risks was impaired by haste and cognitive biases resulting from the pressure to complete the flight before nightfall.
- The pilot's recent flight experience, particularly with the Cessna 206H type, and his night flying experience were limited.
- The aircraft had been sitting on the ground in freezing conditions; had the pilot proceeded with the planned refueling, he might have detected ice accumulation on the upper wing surfaces, which may have also contributed to the loss of control.
Safety action
- The Finnish Meteorological Institute was recommended to add a note to the GAFOR weather guide stating that weather class O does not necessarily permit night VFR operations outside the immediate airport vicinity.
- A recommendation was made to EASA to explore a standard requiring all aviation GPS units to include a non-volatile memory function for recording flight path parameters.
- Finavia was advised to clarify the cooperation agreement between the Finnish Air Rescue Service and airport ATS units regarding specific areas of responsibility.