Ми-8 RA-06138 07.12.2014

     The accident with Mi-8 RA-06136 aircraft operated by "The second Arkhangelsk united aviation division" occurred in Vardaney locality, Nenets Autonomous Area (RF) on December 7, 2014. According to the available information 3 crew members and 4 passengers were on board, 2 people were killed, others were injured.
      The Interstate Aviation Committee has formed the Investigation team of the accident in accordance with the Russian Aviation Legislation. The Investigation team started its work.

     The Investigation team of the Interstate Aviation Committee has completed the investigation of the accident with Мi-8Т RA-06138 helicopter owned by Second Arkhalgensk United Aviation Division JSC occurred in the Arkhalgensk Region (RF) on December 7, 2014. 
      The accident with Мi-8Т RA-06138 helicopter occurred during the emergency landing with two dead engines in whiteout ground conditions and lack of ground cues that did not allow the pilot to determine real flight altitude and perform safe landing. 
      Failure (flameout) of TB2-117 engines set at the helicopter was caused by its aircraft structure imperfection connected with its gasdynamic stability decrease and combustors extinction during operation in conditions causing ice or water flow path encounter.
      Following dangerous factors contributed to the accident:
      - lack of effective design solutions and operational recommendations on prevention TB2-117 engine flameout causing gasdynamic stability loss; 
      - lack of flight restrictions in operational documentation depending on icing rate and anti-icing system specified characteristics;
      - failure to maintain flight parameters recommended by FOM Mi-8 helicopter performing landing at lifting propeller autorotation mode by pilot-instructor;
      - lack of instructions (recommendations) regulating the crew cooperation and operating procedures in case of one or two engine failure in the air when active piloting is performed by the pilot taking the first officer seat taking into account ergonomic features of engine throttle control levers and radio altimiter indicator position.
      The appropriate safety recommendations based on the investigation results were developed.