T-50-3 is the first aircraft to be fitted with the N036 AESA radar which forms part of the Sh121 electronic suite.

Самолёты на фотографии: Aircrafts on the photo: Сухой Су-57 / Т-50 / ПАК ФА - РоссияRussia - 2010

Sensors on the T-50-3: (1) radio transparent (dielectric) nose cone for the N036 radar; (2) 101KS-V infrared search and track; (3) 101KS-O electro-optical jammer; (4) 101KS-U warning sensor; (5) UV-50 decoy launchers.

Самолёты на фотографии: Aircrafts on the photo: Сухой Су-57 / Т-50 / ПАК ФА - РоссияRussia - 2010

A PAK FA drawing from the patent documentation.
In late January the Russian patent office published the patent (submitted on July 28, 2010) of the T-50 configuration, which confirms previous speculation about the fighter. The aircraft features (all shown on the diagram) a blended-body aerodynamic configuration with a lift-generating fuselage (1), fuselage extensions (2) and wing outer sections (3). The empennage, both horizontal (4) and vertical (5) is all-moving and can be deflected together or differentially. The vertical fins rotate differentially and act as an air brake. The engines are housed in wide-spaced nacelles (6) and the axes of the engines are splayed outwards. The engine nozzles (14) can be deflected together or differentially. The wing high-lift devices comprise leading-edge flaps (9), ailerons (10) and flaperons (11).
Other control surfaces include movable front elements of the leading-edge extensions (8), under which engine air intakes (7) are positioned. The patent lists the extensions as 'fuselage' and not 'wing' leading-edge extensions. All-moving vertical fins are mounted on 'stub-pylons' (12) in front of which the air intakes (13) for engine bay cooling and the air-conditioning systems are situated.

Самолёты на фотографии: Aircrafts on the photo: Сухой Су-57 / Т-50 / ПАК ФА - РоссияRussia - 2010