What happened
While participating in a formation flight under conditions of limited visibility, an unidentified aircraft experienced a sudden loss of control. The pilot, under the impression that they had successfully moved past the lead plane, reduced the airspeed to 300 km/h. During this maneuver, the aircraft encountered the wake turbulence generated by a leading An-12.
The resulting aerodynamic instability caused the aircraft to crash. The accident resulted in seven fatalities, with no survivors among the crew members on board.
Findings
Investigation into the sequence of events suggests that the primary factor was the encounter with the wake vortex from the preceding heavy aircraft. This turbulence occurred while the pilot was adjusting speed during a period of restricted visibility, which contributed to the loss of control.