At the time of the accident, the aircraft had sustained only 154 flight hours and 68 pressurization cycles because it had been released from the factory just in March that same year.

[2] Flight 25 departed from Moscow-Sheremetyevo at 03:12 local time and held an altitude of 6000 meters after takeoff.

The aircraft crashed into a field in Pestrechinsky at 04:30 at a speed of 500–600 km/h, killing all 67 people on board.

4 propeller pitch control mechanism on the right wing, which malfunctioned and created severe drag.

Laboratory simulation showed that the failure of the pitch control mechanism was caused by a defect in the oil sealing rubber gasket on the oil transporter of the screw which was caused by incorrect assembly of the AV-68I propeller at the factory.