“A significant event for us will be the start of serial delivery of Su-57 aircraft. I note that the Su-57 will enter the troops in two stages, ”Krivoruchko quoted RIA Novosti magazine as saying.
According to him, in the first phase, "until the mid-2020s," aircraft with fourth-generation engines will be delivered.
“And in the second stage, after the completion of the tests, supplies with the engine and fifth-generation power plants, which have increased fuel efficiency and lower life cycle costs, will already begin,” the deputy defense minister of Russia added.
Earlier, the Russian Ministry of Defense reported that the pilots of the Russian Aerospace Forces fully mastered the Su-57 fighters in all flight modes, including the altitude, speed and overload limits.