Accident Details
The accident occurred during a positioning flight from Moscow-Sheremetyevo Airport to Kharkiv-Osnova Airport, where passengers were to be picked up for a subsequent charter flight to Lyon. On final approach to runway 07, at a distance of 4,600 metres from the runway threshold, the crew selected flaps down. The right flap deployed to an angle of 20° as commanded, but the left flap deployed to only 6°, creating an asymmetry that caused the aircraft to roll to the left. The aircraft entered an uncontrolled descent and crashed on the shore of Lake Komsomolsk.
Sequence of Events
The aircraft disintegrated on impact, with debris found 140 metres beyond the initial crash site. The main wreckage sank in the lake, located approximately 4,300 metres from the runway threshold and 750 metres to the left of its extended centerline. All three crew members were killed.
Investigation
The official investigation determined the probable cause of the accident. Investigators found that a technical failure occurred in the flap deployment synchronization system due to the failure of a drive pinion.
Probable Cause
The crew lost control of the aircraft after they selected flaps down. Investigations showed that a technical failure occurred on the flap deployment synchronization system due to the failure of a drive pinion.