Accident
A training flight operating between Kuybyshev and Ulyanovsk carried 13 crew members and four passengers. The crew consisted of five instructors and eight pilots under supervision. The four passengers were employees of the Voronezh aircraft plant. The flight was uneventful until the approach phase. Upon selecting flaps to the 40-degree position, the aircraft became unstable. From a height of 120 to 150 meters, it stalled and crashed in a field located 1,240 meters short of the runway threshold. The aircraft was destroyed, and all 17 occupants sustained fatal injuries.
Investigation
The official investigation into the accident analyzed the flight data and circumstances leading to the loss of control.
Probable Cause
The investigation's findings stated that the approach was conducted in cloud and icing conditions. It is believed that ice contamination of critical surfaces, such as the stabilizers and elevators, caused the loss of control. The deployment of flaps to 40 degrees in conjunction with icing conditions resulted in a stall. The aircraft's altitude was insufficient for recovery.