Additional tests of the rotorcraft have proved its reliability, safety and flying capability at an altitude up to 5,000 meters

Photo: Russian Helicopters

Mil and Kamov National Helicopter Center owned by Russian Helicopters holding has received the approval of the Federal Air Transport Agency for operation of the Mi-171А2 from airfields and runways at an altitude up to 5,000 meters. The tests have shown that the rotorcraft is highly reliable, safe and capable of flying in extreme mountain conditions. 

During additional testing, the Mi-171А2 performed dozens of flights over mountains in Kabardino-Balkaria and in the foothills of Mount Elbrus. The rotorcraft payload was gradually increased and finally achieved the maximum allowable 13 tons. The flights were performed successfully in all payload conditions. 

The test pilots from Mil and Kamov National Helicopter Center performed functional tests of engines, auxiliary propulsion system, oxygen equipment, flight and navigation system and other main helicopter systems in mountain conditions. Reserve takeoff and landing thrust in thin air conditions, flight control, stability, maneuverability and rate-of-climb of the helicopter at various altitudes were evaluated. 

The Mi-171А2 also underwent high-elevation airfield tests with emergency simulation: the helicopter demonstrated safe landing and takeoff with single engine failure simulation. Such maneuver is a very difficult challenge in thin mountain air conditions and requires not only sufficient reserve engine power, but also high-performance rotor system.