On September 13, the second stage of MC-21-300 in-plant development tests program has begun. The modified airplane systems worked without complaint during the flight. The flight lasted about 2 hours.
In the course of preparations for the second stage of MC-21-300 tests strain gauges have been mounted on the aircraft. They allow to accurately measure loads on the structure. Also by the results of the first flight test stage the software has been corrected .
The main goal of this stage of testing is to extend the range of flights by mass, centering, speed and altitude.
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.