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Prototype of Russian fighter T-50 (PAK FA) 5th generation fighter aircraft performed the first approach and docking with Russian Air Force Il-78 Ariel refueling tanker. The trials involved the second prototype T-50-2, as well as support aircraft Su-25UB with the crew of the Russian Air Force test center. Details of the tested were not disclosed.

In parallel, T-50-2 is being tested for stability, controllability and stability in subsonic and supersonic flight regimes in different configurations. The first prototype T-50-1 was used to fly on large supercritical angles of attack, and tested for maneuverability.

In early August 2012, the third prototype aircraft - the T-50-3 - began testing with a new airborne radar system with an active phased array and optical channels. The radar in the "air" and "air-to-surface" radar showed significant and sustainable results.

T-50-4, the fourth prototype is expected to join the tests before 2012 end . It was reported earlier that the test airframes of PAK FA is to be completed in the current year and in 2013. Russian Air Force plans to acquire ten aircrafts for joint trials. Production deliveries are scheduled for 2015. In total, the Russian Ministry of Defense has ordered 60 T-50 fighters till now.