T-50 053 and 054 take off with external weapons during a test flight.

On May 20, Sukhoi T-50 (PAK FA – Perspektivny Aviatsionny Kompleks Frontovoy Aviatsii—Future Tactical Air System) program entered a new phase with the external weapons integration tests.

Two aircraft are involved in the testing campaign with external stores: “053″ and “054″.

Noteworthy, the two prototypes of Russia’s 5th generation stealth fighter plane, still wearing the standard color scheme and not the brand new “shark” camouflage, carried: R-73 short range air-to-air missile and R-77 medium range, air-to-air, active radar-guided missile system (T-50 “053″); KH-31 anti-ship missile and R-77 air-to-air missile (“054″).

http://theaviationist.com/2014/06/02/t-50-weapon-integration-flights/