Accident Sequence
An aircraft operating an uneventful flight from Tyumen was on final approach to Khanty-Mansiysk Airport at night. Weather conditions were poor due to snowfall, with visibility limited to 5,300 meters and a cloud base at 400 meters. During the approach, the aircraft descended below the minimum descent altitude (MDA) and landed at a speed of 190 km/h on a helipad located 159 meters to the left of the runway and 950 meters from the runway threshold. The aircraft subsequently collided with three parked helicopters and crashed.
Occupants and Damage
Both pilots, a third crew member, and two passengers were killed. The aircraft and the three helicopters, registered RA-22313, RA-25144, and RA-25939, were destroyed.
Investigation Findings
The investigation reported the following findings:
- The crew did not have sufficient information about the deterioration of the weather conditions at destination.
- The crew decided to continue the approach in visibility that was below minimums.
- The power of the ground light system located at the helipad was higher than the runway light system, which, in conditions of limited visibility, caused a wrong perception by the crew.