Su-57, PAK FA (Russian: Pierspiektivnyj Aviacyonnyj Kompleks Frontovoj Aviacyi), T-50 (manufacturer's designation) - Russian fighter aircraft of the fifth generation, which is a response to the American ATF program and the F-22 Raptor air superiority plane.
In 2002, a tender was announced, the winner of which was the office of Sukhoi. The Russian Air Force predicts that their need for a new fighter is about 180 aircraft. These aircraft are likely to be supplemented by the Su-35S and a new lightweight multi-task aircraft, the development of which with the use of the PAK-FA program has been announced a few years after the introduction of the T-50.
On January 24, 2010 tests of the first prototype took place. The flight of the fighter took place on 29 January 2010 at the factory airport KnAAPO in Komsomolsk. The Russian Air Forces gave it the 2017 Su-57 designation.
In total, up to 2018, 10 flying prototypes were produced, not including ground test aircraft. The prototype T-50-9 from April 2017 was the first to receive a set of targeting sensors for the production version. In 2016, it was reported that for the first time armament was fired from the internal chamber. Delivery of the first series of Su-57 fighters for the army with Saturn AŁ-41F-1 engines is planned for 2019. It was planned to purchase 60 aircraft by 2020, but orders will probably fall to 12 (among others due to the development of the classic Su-35 construction). Production of the next series of "second stage" fighters with new "product 30" engines (and proceed 30) is due to start after 2020.
Currently, 3 aircrafts are located at the Hmeimim airport in Syria, where they will undergo use tests in conditions similar to the combat ones, which will be a costly and risky test for them, but which can contribute a lot to the issue of serial options (I wrote about this before)
I'm ashamed to admit, but I had to use google translate.