What happened
A transport flight traveling from Pärun to Tapa Air Base was carrying a total of 21 occupants, including six crew members and 15 pilots of the Sukhoi SU-9. While performing the final approach to the airfield, the aircraft encountered heavy snow showers that significantly reduced visibility.
During this phase of flight, the wing of the plane made contact with a chimney belonging to a spirit factory. This impact caused the aircraft to lose control and descend into an open field located within 3 km of the runway threshold in Moe. The resulting crash led to a fire that destroyed the airframe. There were 21 fatalities and no survivors.
Findings
The investigation determined that the accident was driven by a poorly planned approach executed by the flight crew, which left them unaware of their dangerously low altitude during the period of low visibility.