The aircraft performed a passenger flight from Alma-Ata to Simferopol with en route stops at Karaganda and Rostov. While en route to Rostov, at an altitude of 7800 m, at night, the plane began to vigorously roll to the left. After 20-30 seconds the pilots switched off the autopilot but the roll continued to increase and the aircraft went into a dive with a left turn and an increase in flight speed. The aircraft descended to 5000 m, with the speed reaching 680 km/h and an overload of 3.5 g The crew managed to regain control of the aircraft and made an emergency landing at Rostov. The plane was decommissioned due to the serious damage to the fuselage as a result of the overload.