The MC-21-300 prototype aircraft successfully completed certification tests under natural icing conditions and returned from Arkhangelsk airport to the Ramenskoye airfield in Zhukovsky.

During the tests, the aircraft made 14 flights lasting from 3 to 5 hours over the coast of the White Sea, the Pechora Bay of the Barents Sea, south of Novaya Zemlya, and also in the Subpolar Urals region.

According to the certification rules, the aircraft must confirm the calculated performance characteristics with a layer of ice 7.6 cm thick. During the tests, the MC-21-300 retained its stability, controllability and performance characteristics when the ice thickness on the structural elements is greater than the standard level.

In addition to the stability and controllability of the aircraft during the flights, the operation of the anti-icing systems of the MC-21-300 aircraft was tested.

According to the current regulations, in the interest of improving safety, the tests confirm the ability of the aircraft to continue flying with the anti-icing system inoperative.

Also, in icing conditions, the operation of a number of aircraft systems was tested, in particular, external lighting equipment, radio communication equipment and landing gear.

The test program has been completed in full. The preliminary test results showed that the MC-21-300 aircraft in terms of icing complies with Russian and European aviation standards.