Two UTair helicopters took-off close to each other at the Vankor oil field. The first take-off was carried out by the Mi-8AMT helicopter RA-22427 with an external cargo and without passengers on board. The second was performed by Mi-8AMT RA-25640 with 15 passengers (oil workers employed by Rosneft subsidiary Vankorneft and their contractors).
According to preliminary information, after take-off, the passenger Mi-8AMT collided with the external load of the other helicopter, crashed about 2km from the airfield and caught fire. All 3 crew members and 15 passengers were killed.
