What happened
During a local training mission at Tula Airport, a four-engine aircraft carrying six crew members was performing its approach under marginal weather conditions. During this maneuver, it collided with another Antonov AN-12BP operated by the Soviet Air Force (Voyenno-vozdushnye sily CCCP). The second aircraft had been traveling from Sestsha Airbase in Bryansk and was transporting 14 passengers along with a crew of six.
Following the impact, both aircraft lost altitude rapidly and descended into a field situated a short distance from the airport. The accident resulted in 27 fatalities, representing all occupants aboard both airframes.
Findings
Investigations into the collision identified that a radar failure prevented air traffic controllers from accurately tracking the positions of the two aircraft. Additionally, the presence of poor visibility caused by marginal weather conditions was noted as a contributing factor to the accident.