21 June, 2017 MC-21-300 aircraft performed the fifth flight within the program of in-plant development tests.
During the flight, lasted 2 hours and 10 minutes, the aircraft fully completed the flight task, which included testing the wing in all configurations. In particular, the landing was carried out in the landing configuration of high lift devices. The aircraft flew with retracted landing gear.
On 20 June, 2017 Oleg Demchenko, the president of Irkut Corporation at the Paris International Air Show said that МС-21-300 will perform more than 30 test flights within development test program after which certification tests will begin.
On 24 May 2018, Republic State Enterprise Kazspetsexport of Ministry of Defense and Aerospace Industry of the Republic of Kazakhstan and Irkut Corporation (an affiliate of UAC) signed the contract for delivery of another batch of Su-30SM multirole fighters. The contract was signed by the General Director of Kazspetsexport, Arman Ramazanov and the First Vice-President and General Designer of Irkut Corporation, Oleg Demchenko.
On May 12, 2018, the maiden flight of the second MC-21-300 test aircraft took place at the airfield of Irkutsk Aviation Plant, the affiliate of Irkut Corporation (a UAC member). The testing results of the first test aircraft were taken into account in the production of a new aircraft.
At the Irkutsk Aviation Plant, a branch of Irkut Corporation (part of UAC), the construction of the second MC-21-300 aircraft, intended for flight testing, was completed. The testing results of the first test aircraft were taken into account in the production of a new aircraft. On March 25, the MC-21-300 was transferred from the final assembly shop to the flight test department.