Mi-8Т RA-22580 02.06.2015

     Non-fatal accident with helicopter Mi-8T RA-22580 owned by "UTair - Helicopter services" JSC occurred 60 km north of Talakan Airport (Republic of Sakha, Yakutia, RF). According to the available information 3 crew members and a passenger were on board. The passenger was injured, the aircraft was damaged.
     
The Interstate Aviation Committee has assigned the Investigation team of this accident in accordance with the Russian Aviation Legislation. The Investigation team has started its work.

The Investigation team of the Interstate Aviation Committee has completed the investigation of the accident with Mi-8Т RA-22580 helicopter owned by "UTair - Helicopter services" JSC occurred in the Leninsky District of the Sakha Republic (Yakutia, RF).

The accident with Mi-8Т RA-22580 helicopter was caused by not holding speed rate during helicopter acceleration followed by climbing optimal trajectory during no-run takeoff using ground effect most probably with helicopter overweight resulted in rotorcraft mush during "ground effect" recovery and collision with trees.

The following factors most probably contributed to the accident: 

-         unstable wind conditions: wind shift and/or wind speed change and possible downburst; 

-         lack of specified form and sizes at wind sock platform.

The appropriate safety recommendations based on the investigation results were developed.