The Sukhoi Su-57 (Russian: Сухой Су-57; NATO reporting name: Felon) is a stealth, single-seat, twin-engine multirole fifth-generation jet fighter being developed since 2002 for air superiority and attack operations. The aircraft is the product of the PAK FA (Russian: ПАК ФА, short for: Перспективный авиационный комплекс фронтовой авиации, romanized: Perspektivny Aviatsionny Kompleks Frontovoy Aviatsii, lit. ''prospective aeronautical complex of front-line air forces''), a fifth-generation fighter programme of the Russian Air Force. Sukhoi's internal name for the aircraft is T-50. The Su-57 is planned to be the first aircraft in Russian military service to use stealth technology. Its maiden flight took place on 29 January 2010 and the first production aircraft is expected to be delivered in 2019 with a second to follow in 2020.
|A prototype of the Su-57 in flight at the MAKS 2011 air show.|
|Role||Stealth air superiority fighter|
|First flight||29 January 2010|
|Status||In serial production|
|Primary users||Russian Air Force|
|Number built||10 flyable prototypes|
|Program cost||US$8–10 billion (2009 est.)|
The fighter is designed to have supercruise, supermaneuverability, stealth, and advanced avionics to overcome the prior generation fighter aircraft as well as ground and naval defences. The Su-57 is intended to succeed the MiG-29 and Su-27 in the Russian Air Force.
The prototypes and initial production batch are to be delivered with a highly upgraded Lyulka AL-31 variant, the AL-41F1, as an interim powerplant while an advanced clean-sheet design engine, the Saturn izdeliye 30, currently in final stages of development, is to be available after 2020. The aircraft is expected to have a service life of up to 35 years.
- 1 Development
- 2 Design
- 3 Operational history
- 4 Variants
- 5 Operators
- 6 Accidents
- 7 Specifications (Su-57)
- 8 See also
- 9 References
- 10 External links
In 1979, the Soviet Union outlined a need for a next-generation aircraft intended to enter service in the 1990s. The project was designated the I-90 (Russian: Истребитель, Istrebitel, "Fighter") and required the fighter to have substantial ground attack capabilities and would eventually replace the MiG-29s and Su-27s in frontline tactical aviation service. The subsequent programme designed to meet these requirements, the MFI (Russian: МФИ, Russian: Многофункциональный фронтовой истребитель, Mnogofunksionalni Frontovoy Istrebitel, "Multifunctional Frontline Fighter"), resulted in Mikoyan's selection to develop the MiG 1.44. Though not a participant in the MFI, Sukhoi started its own programme in 1983 to develop technologies for a next-generation fighter aircraft, resulting in the S-37, later designated Su-47. Due to a lack of funds after the collapse of the Soviet Union, the MiG 1.44 programme was repeatedly delayed and the first flight of the prototype did not occur until 2000, nine years behind schedule. The MiG 1.44 was subsequently cancelled and a new programme for a next-generation fighter, PAK FA, was initiated. The programme requirements reflected the capabilities of Western fighter aircraft, such as the Eurofighter Typhoon and F-22 Raptor. In 2002, Sukhoi was selected over Mikoyan as the winner of the PAK FA competition and would lead the design of the new aircraft; Mikoyan continued to develop its proposal as the LMFS (Russian: ЛМФС, Russian: Легкий многофункциональный фронтальный самолёт, Liogkiy Mnogofunktsionalniy Frontovoi Samolyet, "Light Multifunctional Frontline Fighter") which was designed to be smaller and more affordable.
To reduce the PAK FA's developmental risk and spread out associated costs, as well as to bridge the gap between it and older previous generation fighters, some of its technology and features, such as propulsion and avionics, were implemented in the Sukhoi Su-35S fighter, an advanced variant of the Su-27. The Novosibirsk Aircraft Production Association (NAPO) is manufacturing the new multi-role fighter at Komsomol'sk-on-Amur along with Komsomolsk-on-Amur Aircraft Production Association (KnAAPO), and final assembly is to take place at Komsomol'sk-on-Amur. Following a competition held in 2003, the Tekhnokompleks Scientific and Production Center, Ramenskoye Instrument Building Design Bureau, the Tikhomirov Scientific Research Institute of Instrument Design (NIIP), the Ural Optical and Mechanical Plant (UOMZ) in Yekaterinburg, the Polet firm in Nizhny Novgorod and the Central Scientific Research Radio Engineering Institute in Moscow were selected for the development of the PAK-FA's avionics suite. NPO Saturn is the lead contractor for the interim engines; Saturn and MMPP Salyut will compete for the definitive second stage engines. In 2004, the fighter's conceptual design was completed and approved by Russia's Defense Ministry, with Alexander Davidenko selected as the Chief designer.
On 8 August 2007, Russian Air Force Commander-in-Chief (CinC) Alexander Zelin was quoted by Russian news agencies that the programme's development stage was complete and construction of the first aircraft for flight testing would begin, and that by 2009 there would be three fifth-generation aircraft ready. In 2009, the aircraft's design was officially approved.
In 2007, Russia and India agreed to jointly develop the Fifth Generation Fighter Aircraft Programme (FGFA) for India. In September 2010, it was reported that India and Russia had agreed on a preliminary design contract where each country was to invest $6 billion; development of the FGFA fighter was expected to take 8–10 years. The agreement on the preliminary design was to be signed in December 2010. India planned on acquiring a modified version for its FGFA programme. It originally planned on buying 166 single-seat and 48 two-seat fighters, but later changed it to 214 single-seat fighters, and later decreased its purchasing size to 144 fighters by 2012. In early 2018, India pulled out of the FGFA project, which it believed did not meet its requirements for stealth, combat avionics, radars and sensors by that time. This news lead some observers to question the future of the whole Su-57 project.
The Russian Air Force was expected to procure more than 150 fighters for PAK FA with the first fighter to be delivered in 2016. In 2011, the Russian Defence Ministry planned on purchasing the first 10 evaluation aircraft after 2012 and then 60 production standard aircraft after 2016. In December 2014, the Russian Air Force planned to receive 55 fighters by 2020. Russian Deputy Minister of Defence Yury Borisov stated in 2015 that the Air Force would slow production, reduce its initial order to 12 fighters, and retain large fleets of fourth-generation fighters due to the nation's economy.
Russian Air Force Commander-in-Chief Viktor Bondarev stated that the fighter planned to enter serial production in 2017, after all trials would be completed. In 2017, Deputy Minister Yury Borisov stated that the Su-57 would most likely enter service in 2018, due to implementation of more advanced engines, and further testing. He also stated that it would be part of the new 2018-2027 state armament programme. Actual number of aircraft to be delivered is yet unknown.
On 30 June 2018, it was reported that an order for 12 aircraft was agreed, with deliveries to the ranks of the Russian Armed Forces starting in 2019. The first aircraft will join fighter regiments at the Lipetsk Air Center. At the same time, the Deputy Prime Minister for Defence and Space Industry Yury Borisov stated that "Today, the Su-35 is one of the world's best fighters, so there is no reason for us to speed up work on mass production of the fifth-generation fighter." Borisov's statement caused confusion among observers. Some interpreted the fifth generation fighter he referenced as the FGFA, the exported variant of the Su-57, while others interpreted it to be directly alluding to the Su-57 itself. This also led to predictions and concerns about the project's future: some have interpreted it as reiteration that the Su-57 program would continue as previously planned, others interpreted it as the Su-57 program would not be mass-produced, and some believe it to be an implicit announcement of the project's cancellation. The slowing of procurement could be because of the current slow growth of the Russian economy, while the future patches' procurement are for an unknown future; the Russian military could be waiting for the more powerful Saturn izdeliye 30 engine to be ready for serial production.
On 22 August 2018, during the International Military-Technical Forum «ARMY-2018», the Russian Defence Ministry and the JSC Sukhoi signed the first contract for delivery of two serial Su-57 fighters. The deliveries of the first two such aircraft are scheduled for 2019 and 2020, respectively.
Russian Defence Ministry planned to conclude a second contract for 13 more aircraft in 2020. However, on 15 May 2019, Russian President Vladimir Putin announced that 76 aircraft will be purchased and delivered to the Air Force by 2028. This came after the price of the Su-57 and equipment was reduced by 20%. The contract for the 76 aircraft was formally signed on 27 June 2019 at the International Military-Technical Forum «ARMY-2019». The same month, General Director of Tactical Missiles Corporation (KRTV) Boris Obnosov reported, a contract for serial production of ammunition for Su-57 fighters was signed, and is being inducted.
JSC Sukhoi has started the serial production of the aircraft in late July 2019.
Initial flight testing
The prototype's maiden flight was repeatedly postponed from early 2007 after encountering unspecified technical problems. In August 2009, Alexander Zelin acknowledged that problems with the engine and in technical research remained unsolved. On 28 February 2009, Mikhail Pogosyan announced that the air-frame was almost finished and that the first prototype should be ready by August 2009. On 20 August 2009, Pogosyan said that the first flight would be by year's end. Konstantin Makiyenko, deputy head of the Moscow-based Centre for Analysis of Strategies and Technologies said that "even with delays", the aircraft would likely make its first flight by January or February, adding that it would take five to ten years for commercial production.
Flight testing was further delayed when Deputy Prime Minister Sergei Ivanov announced in December 2009 that the first trials would begin in 2010. The first taxi test was successfully completed on 24 December 2009. Flight testing began with T-50-1, the first prototype aircraft, on 29 January 2010. Piloted by Hero of the Russian Federation Sergey Bogdan, the aircraft's 47-minute maiden flight took place at KnAAPO's Dzemgi Airport in the Russian Far East.
The second aircraft was to initially start flight testing in late 2010; this was delayed until early 2011. On 3 March 2011, the second prototype, T-50-2, completed a 44-minute test flight. The first two prototypes lacked radar and weapon control systems. On 14 March 2011, the fighter achieved supersonic flight at a test range near Komsomolsk-on-Amur. The T-50 was displayed publicly for the first time at the 2011 MAKS Airshow. On 3 November 2011, the fighter reportedly performed its 100th flight. More than 20 test flights were made in the next nine months.
On 22 November 2011, the third prototype, T-50-3, took its first flight from KnAAPO's airfield in Komsomolsk-on-Amur, piloted by Sergey Bogdan. The aircraft spent over an hour in the air, and was subjected to basic stability and power-plant checks. It differs from the other prototypes in the way it lacks a pitot tube. At this time all 14 test aircraft were expected to fly by 2015. T-50-3 was the first prototype to fly with an AESA radar. Originally scheduled for the end of 2011, these flights occurred in August 2012, and showed performance comparable to existing radars.
The fourth prototype had its first flight on 12 December 2012 and joined the other three aircraft in testing near Moscow a month later. By the end of 2013, five prototypes were flown, with the fifth prototype having its first flight on 27 October 2013; with this flight the programme has amassed more than 450 flights. The first aircraft for State testing was delivered on 21 February 2014.
The fifth prototype, T-50-5 hull number 055, was severely damaged by an engine fire after landing in June 2014. The aircraft was returned to flying condition after cannibalizing components from the unfinished sixth prototype.
The sixth prototype first flew on 27 April 2016.
List of prototypes
|T-50-0||—||Prototype for static ground testing|
|T-50-KNS||—||Prototype for integration testing|
|T-50-1||051||First flyable prototype; first flight on 29 January 2010.|
|T-50-2||052||Second flyable prototype; first flight on 3 March 2011, first supersonic flight on 24 March. First prototype flight-tested with an izdeliye 30 engine, first flight on 5 December 2017.|
|T-50-3||053||Third flyable prototype; first flight on 22 November 2011. In 2012, became the first prototype to be equipped with AESA radar, first tested in flight on 8 August 2012.|
|T-50-4||054||Fourth flyable prototype, and the first one equipped with the complete set of avionics; first flight on 12 December 2012.|
|T-50-5 / T-50-5R||055||Fifth flyable prototype, first flight on 27 October 2013. Heavily damaged by fire in June 2014, repaired and renamed to T-50-5R, first flight after repairs on 16 October 2015.|
|T-50-6||—||Cannibalized for parts to repair T-50-5.|
|T-50-6-1||—||Second-stage prototype[N 1] for static ground testing.|
(also called T-50-6)
|056||Sixth flyable prototype (first flyable second-stage[N 1] prototype); first flight on 27 April 2016. The fuselage cover panels are partially replaced by composite materials. The rear part of the fuselage (in which the EW complex is located) was elongated, the shape of the lower fuselage in the tail section, the hatches and airbleed doors were also changed.|
|T-50-8||058||Seventh flyable prototype (second flyable second-stage[N 1] prototype); first flight on 17 November 2016.|
|T-50-9||509||Eighth flyable prototype (third flyable second-stage[N 1] prototype); first flight on 24 April 2017. Testing final version of avionics intended for serial production.|
|T-50-10||510||Tenth flyable prototype, first flight on 23 December 2017. It is supposed to be the last prototype.|
|T-50-11||511||Ninth flyable prototype, first flight on 6 August 2017. Testing version of the airframe intended for serial production.|
The Su-57 is intended to be a fifth-generation multirole fighter aircraft and the first operational stealth aircraft for the Russian Air Force. Although most information is classified, sources within the Sukhoi company and Defence Ministry have openly stated that the aircraft is to be stealthy, supermaneuverable, have supercruise capability, incorporate substantial amounts of composite materials, and possess advanced avionics such as active phased-array radar and sensor fusion.
The Su-57 has a blended wing body fuselage and incorporates all-moving horizontal and vertical stabilizers; the vertical stabilizers toe inwards to serve as the aircraft's airbrake. The aircraft incorporates thrust vectoring and has adjustable leading–edge vortex controllers (LEVCONs) designed to control vortices generated by the leading edge root extensions, and can provide trim and improve high angle of attack behaviour, including a quick stall recovery if the thrust vectoring system fails. The advanced flight control system and thrust vectoring nozzles make the aircraft departure-resistant and highly maneuverable in both pitch and yaw, enabling the aircraft to perform very high angles of attack maneuvers such as the Pugachev's Cobra and the bell maneuver, along with doing flat rotations with little altitude loss. The aircraft's aerodynamics and engines enable it to achieve Mach 2 and is also capable of flying supersonic flight without afterburners, or supercruise; the high cruising speed and normal operating altitude is also expected to give it a significant kinematic advantage over prior generations of aircraft. The Su-57 has a climb rate ranging from 330 m/s (1,100 ft/s) to 361 m/s (1,180 ft/s).
The aircraft will make extensive use of composites; on the first prototype, composites comprise 25% of the structural weight and almost 70% of the outer surface. Second stage prototype will increase the usage of composite material, as well as stronger airframe, elongated tail, wider wingspan and the possibility to install newer engines. According to Viktor Pryadka, the CEO of the Avintel Aviation Technologies Alliance, the plane could withstand up to 15 G overloads in UAV Mode.[dubious ]
Weapons are housed in two tandem main weapons bays between the engine nacelles and smaller bulged, triangular-section bays near the wing root. Internal weapons carriage eliminates drag from external stores and enables higher performance compared to external carriage, as well as enhancing stealth. Advanced engines and aerodynamics enable the Su-57 to supercruise, sustained supersonic flight without using afterburners. Combined with a high fuel load, the fighter has a supersonic range of over 1,500 km (930 mi), more than twice that of the Su-27. Extendible refueling probe is available to further increase its range. In the Su-57's design, Sukhoi addressed what it considered to be the F-22's limitations, such as its inability to use thrust vectoring to induce roll and yaw moments and a lack of space for weapons bays between the engines, and complications for stall recovery if thrust vectoring fails.
The Su-57 is planned to be the first operational aircraft in Russian Air Force service to use stealth technology. Similar to other stealth fighters such as the F-22, the airframe incorporates planform edge alignment to reduce its radar cross-section (RCS); the leading and trailing edges of the wings and control surfaces and the serrated edges of skin panels are carefully angled to reduce the number of directions the radar waves can be reflected. Weapons are carried internally in weapons bays within the airframe and antennas are recessed from the surface of the skin to preserve the aircraft's stealthy shape. The infrared search-and-track sensor housing is turned backwards when not in use and its rear is treated with radar-absorbent material (RAM) to reduce its radar return. To mask the significant RCS contribution of the engine face, the partial serpentine inlet obscures most of the engine's fan and inlet guide-vanes (IGV). The production aircraft incorporates radar-absorbing materials on the walls of the air ducts and radar blockers similar in principle to those used on the F/A-18E/F in front of the engine fan to hide it from all angles. The fuselage of the aircraft is to also use RAM to absorb radar emissions and reduce the reflection back to the source.
Due to the extensive use of polymeric carbon plastics composites, the aircraft has four times fewer parts compared to the Su-27, weighs less and is easier to mass-produce. The aircraft canopy is made of composite material and 70-90 nm thick metal oxide layers with enhanced radar wave absorbing to minimize the radar return of the cockpit by 30% and protect the pilot from the impact of ultraviolet and thermal radiation. The Su-57's design emphasizes frontal stealth, with RCS-reducing features most apparent in the forward hemisphere; the shaping of the aft fuselage, the seams between parts, and rivets are much less optimized for radar stealth compared to the F-22. However, during MAKS 2019 the craftsmanship of the fuselage was actually finer than expected and looked smooth despite the rivets.
The combined effect of airframe shape and RAM of the production aircraft is estimated to have reduced the aircraft's RCS to a value thirty times smaller than that of the Su-27. Sukhoi's patent for the Su-57's stealth features cites an average RCS of approximately 0.1 to 1 m2, compared to the Su-27's of approximately 10 to 15 m2. Like other stealth fighters, the Su-57's low observability measures are chiefly effective against high-frequency (between 3 and 30 GHz) radars, usually found on other aircraft. The effects of Rayleigh scattering and resonance mean that low-frequency radars, employed by weather radars and early-warning radars are more likely to detect the Su-57 due to its size. Such radars are also large, susceptible to clutter and are less precise.
Pre-production T-50 and initial production batches of the Su-57 will use interim engines, a pair of NPO Saturn izdeliye 117,[N 2] or AL-41F1. Closely related to the Saturn 117S engine used by the Su-35S, the 117 engine is a highly improved and uprated variant of the AL-31 that powers the Su-27 family of aircraft. The 117 engine produces 93.1 kN (21,000 lbf) of dry thrust, 147.1 kN (33,067 lbf) of thrust in afterburner, and has a thrust to weight ratio of 10.5:1. The engines have full authority digital engine control (FADEC) and are integrated into the flight control system to facilitate maneuverability and handling.
The two 117 engines incorporate thrust vectoring (TVC) nozzles whose rotational axes are each canted at an angle, similar to the nozzle arrangement of the Su-35S. This configuration allows the aircraft to produce thrust vectoring moments about all three rotational axes, pitch, yaw and roll. Thrust vectoring nozzles themselves operate in only one plane; the canting allows the aircraft to produce both roll and yaw by vectoring each engine nozzle differently. The engine inlet incorporates variable intake ramps for increased supersonic efficiency and retractable mesh screens to prevent foreign object debris being ingested that would cause engine damage. The 117 engine is to also incorporate infrared and RCS reduction measures. In 2014, the Indian Air Force openly expressed concerns over the reliability and performance of the 117 engines; during the 2011 Moscow Air Show, a T-50 suffered a compressor stall that forced the aircraft to abort takeoff.
Production fighters from 2020 onward will be equipped with a more powerful engine known as the izdeliye 30.[N 2] Compared to the 117, the new powerplant will have increased thrust, lower costs, better fuel efficiency, and fewer moving parts. Those features, along with subsequently improved reliability and lower maintenance costs will improve the aircraft performance and reliability. The izdeliye 30 is designed to be 30% lower specific weight than its 117 predecessor. The new engine is estimated to produce approximately 107 kN (24,054 lbf) of dry thrust and 176 kN (39,556 lbf) in afterburner. Full scale development began in 2011 and the engine's compressor began bench testing in December 2014. The first test engines are planned to be completed in 2016, and flight testing is projected to begin in 2017. According to Deputy Minister Borisov, flight testing with new izdeliye 30 engines will begin at Q4-2017. The new powerplant is designed to be a drop-in replacement for the 117 with minimal changes to the airframe.
On 5 December 2017, the first flight of the second Su-57 prototype (T-50-2, bort no. 052) fitted with the izdeliye 30 engine took place at the Gromov Flight Research Institute. The 17–minute test flight was carried out by Sergei Bogdan, Sukhoi chief test pilot. The izdeliye 30 engine was installed on the port-side engine position while the izdeliye 117 engine remained on the starboard side. The izdeliye 30 features a new serrated nozzle compared to flat one on 117, and is slightly shorter than the izdeliye 117 nozzle.
The T-50 prototype has two tandem main internal weapon bays each approximately 4.6 m (15.1 ft) long and 1.0 m (3.3 ft) wide and two small triangular-section weapon bays that protrude under the fuselage near the wing root. Internal carriage of weapons preserves the aircraft's stealth and significantly reduces aerodynamic drag, thus preserving kinematic performance compared to performance with external stores. The Su-57's high cruising speed is expected to substantially increase weapon effectiveness compared to its predecessors. Vympel is developing two ejection launchers for the main bays: the UVKU-50L for missiles weighing up to 300 kg (660 lb) and the UVKU-50U for ordnance weighing up to 700 kg (1,500 lb).
For air-to-air combat, the Su-57 is expected to carry four beyond-visual-range missiles in its two main weapons bays and two short-range missiles in the wing root weapons bays. The primary medium-range missile is the active radar-homing K-77M (izdeliye 180), an upgraded R-77 variant with AESA seeker and conventional rear fins. The short-range missile is the infrared-homing ("heat seeking") K-74M2 (izdeliye 760), an upgraded R-74 variant with reduced cross-section for internal carriage. A clean-sheet design short-range missile designated K-MD (izdeliye 300) is being developed to eventually replace the K-74M2. For longer ranged applications, four large izdeliye 810 beyond-visual-range missiles can be carried, with two in each main weapons bay.
The main bays can also accommodate air-to-ground missiles such as the Kh-38M, as well as multiple 250 kg (550 lb) KAB-250 or 500 kg (1,100 lb) KAB-500 precision guided bombs. The aircraft is also expected to carry further developed and modified variants of Kh-35UE (AS-20 "Kayak") anti-ship missile and Kh-58UShK (AS-11 "Kilter") anti-radiation missile. For missions that do not require stealth, the Su-57 can carry stores on its six external hardpoints. BrahMos Aerospace chief A. Sivathanu Pillai stated that there was a possibility of the installation of BrahMos supersonic cruise missile on the Su-57 FGFA derivative. New hypersonic missile with characteristics similar to the Kh-47M2 Kinzhal ALBM is also being developed for the Su-57. The missile is to have intra-body accommodation and smaller dimensions to allow it to be carried inside the Su-57's main central weapon bays.
The aircraft has an internally mounted 9A1-4071K (GSh-30-1) 30 mm cannon near the right LEVCON root. The cannon is the lightest in 30mm class with 50 kg weight, and could fire up to 1,800 rounds per minute. The cannon can fire blast-fragmentation, incendiary and armor-piercing tracer rounds and is effective against even lightly armored ground, sea and aerial target up to 800 m for aerial target and 1,800 m for ground target. The cannon is equipped with autonomous water cooling system, where water inside barrel jacket vaporized during operation.
The Su-57 has a glass cockpit with two 38 cm (15 in) main multi-functional LCD displays similar to the arrangement of the Su-35S. Positioned around the cockpit are three smaller control panel displays. The cockpit has a wide-angle (30° by 22°) head-up display (HUD). Primary controls are the joystick and a pair of throttles. The aircraft uses a two-piece canopy, with the aft section sliding forward and locking into place. The canopy is treated with special coatings to increase the aircraft's stealth.
The Su-57 employs the NPP Zvezda K-36D-5 ejection seat and the SOZhE-50 life support system, which comprises the anti-g and oxygen generating system. The 30 kg (66 lb) oxygen generating system will provide the pilot with unlimited oxygen supply. The life support system will enable pilots to perform 9-g maneuvers for up to 30 seconds at a time, and the new VKK-17 partial pressure suit will allow safe ejection at altitudes of up to 23,000 m (75,000 ft). In November 2018, the system is said to be at the final stage of test -the stage of state flight tests- and the test pilots are already flying in this equipment. The pilot gear also consisted of a digital helmet which connected to on-board photo and video cameras to improve pilot's situational awareness. It also features pupil's movement detection system to allow automatic targeting unlike previous Soviet fighters. There also a survival kit consisting a pan, antenna, signal mirror, 16 cubes of sugar, first aid kit, two match boxes, a signal pistol with charges, 1.5-liter bottle of water, machete knife, radio beacon, and portable radio. The pilot could use the survival kit's container as a boat or water-proof sleeping bag if necessary.
The main avionics systems are the Sh121 multifunctional integrated radio electronic system (MIRES) and the 101KS Atoll electro-optical system.
The Sh121 consists of the N036 Byelka radar system and L402 Himalayas electronic countermeasures system. Developed by Tikhomirov NIIP Institute, the N036 consists of the main nose-mounted N036-1-01 X band active electronically scanned array (AESA) radar, or active phased array radar (Russian: Активная фазированная антенная решётка, Aktivnaya Fazirovannaya Antennaya Reshotka, Russian: АФАР, AFAR) in Russian nomenclature, with 1,552 T/R modules and two side-looking N036B-1-01 X-band AESA radars with 358 T/R modules embedded in the cheeks of the forward fuselage for increased angular coverage. Moreover, the side-looking radar could enable Su-57 to employ extreme beaming tactic (fighter turns 90 degrees away / perpendicular to an enemy's pulse doppler radar array, so enemy's radar would not detect / misinterpret it as a non-moving object) while still able to guide its own missile. The suite also has two N036L-1-01 L band transceivers on the wing's leading edge extensions that are not only used to handle the N036Sh Pokosnik (Reaper) friend-or-foe identification system but also for electronic warfare purposes. Computer processing of the X- and L-band signals by the N036UVS computer and processor enable the system's information to be significantly enhanced.
In 2012, ground tests of the N036 radar began on the third T-50 prototype aircraft. The L402 Himalayas electronic countermeasures (ECM) suite made by the KNIRTI institute uses both its own arrays and that of the N036 radar system. One of its arrays is mounted in the dorsal sting between the two engines. The system was mounted on the aircraft in 2014. Radio telephone communication and encrypted data exchange among various aircraft and also command centers (ground and sea-based and airborne) will be provided by S-111 system, developed by Federal Research and Development Center NPP Polet. The system will be based on modular concept and could be installed not only on Su-57, but also on various aircraft, helicopter, and drones. "Its effective range of operation is up to 1,500 kilometres (930 mi)" a spokesman said. "The system's reliability is guaranteed by the multiple redundancy of the main functions and cutting edge technical solutions, as well as a wide range of radio channels."
The UOMZ 101KS Atoll electro-optical system consisted of:
- The 101KS-V infra-red search and track turret mounted on the starboard side in front of the cockpit. This sensor can detect, identify, and track multiple airborne targets simultaneously.
- The 101KS-O Directional Infrared Counter Measures system has sensors housed in turrets mounted on the dorsal spine and forward fuselage under the cockpit and uses modulated laser-based countermeasures to confuse or destroy heat-seeking missiles' tracking mechanism. Judging from its position, the system allegedly intended not only as a self-protection against MANPADS but also air-to-air missile. In this regard, Su-57 could be something of a pioneer, while similar DIRCM capabilities haven't been ported over to the latest generations of high-flying western fighter aircraft.
- The 101KS-U ultraviolet missile approach warning sensors (MAWS) against infra-red homing missiles. MAWS using ultraviolet technology can operate under all weather conditions and will not be affected by solar clutter. It provides good directional information of the incoming missile for good decoy dispensing decision making, maneuvering and to cue the DIRCM system into action.
- The 101KS-P, a high-resolution thermal imager, provides low-altitude piloting and landing in night conditions. It is installed in front of the compartments of short-range missiles and is not used for targeting purposes but for efficient low altitude flight and night landing operations.
- 101KS-N (наземная = Ground) advanced stabilised navigation and targeting system integrated into the airframe underside of forward fuselage: scannig mirror and automatic tracking unit, laser rangefinder/target indicator and laser spot tracker.
- Optional 101KS-N navigation and targeting pod. It will have similar function to the AN/AAQ28 Litening and AN/AAQ33 Sniper advanced targeting pods of the US military and will be mounted externally under the air intake.
In 2014, Concern Radio-Electronic Technologies (KRET) announced it has created an upgraded BINS-SP2M strapdown inertial navigation system, developed by its two enterprises, Moscow Institute of Electromechanics and Automatics (MIEA) and Ramensky Instrument Engineering Plant (RPZ). Built on the basis of laser gyros and quartz accelerometers, it autonomously processes navigation and flight information, determines position and motion parameters in the absence of satellite navigation, and can integrate with GLONASS. It is guaranteed to last at least 10,000 hours, and can be utilized universally not only in airborne, but also in marine and terrestrial equipment. In 2016, KRET announced it is developing multifunctional video processing system called "Okhotnik" (Hunter), to increase the Su-57's target detection range as well as to improve automatic detection and tracking of targets.
In April 2017, UAC announced that a new next-generation integrated avionics suite has started flight-testing. According to Dmitry Gribov, a chief designer of the new complex, the new avionics suite—called the ИМА БК, the Russian acronym for Интегрированная модульная авионика боевого комплекса (integrated modular avionics combat systems)—will replace a system designed in 2004 called Багет (Baguette) used on the Su-35. The still-in-development system has more than 4 million lines of code. The IMA BK makes use of indigenous Russian multi-core microprocessors and a new indigenous real-time operating system called "BagrOS-4000". The new avionic suite also makes use of fiber-optic channels with a throughput of more than 8 Gbit/s, which is up from 100 Mbit/sec for traditional copper wires. The new IMA BK integrated avionics suite is designed to automatically detect, identify, and track the most dangerous targets and offer the pilot the best solution to engage an enemy. The new system will take control of almost all of the key sensors of the aircraft—radar, navigation and communication that in previous aircraft were controlled by separate computers—simultaneously performs the role of an electronic pilot, electronic navigator and electronic flight engineer.
A monitoring system mimicking living organism's nervous system will allow real-time assessment of the aircraft's condition and predict the remaining 'life' of the composite parts of the aircraft by combining optical fibers with sensitivity to mechanical influences with aircraft's network system. The information about aircraft's condition will be transmitted via laser beam through the optical fiber woven into the structure. It will decrease aircraft's maintenance costs and allow parts to be repaired preemptively, thus improving flight safety.
Since the Russian military doctrine is very different from the US's military doctrine, this fighter follows a different design philosophy. The Aerospace Forces' main roles are to provide support for ground troops at a tactical level and air defense. With the Su-57's forward-optimized stealth and infrared sensor, the aircraft could be considered as a counter-stealth fighter meant to get as close as possible to adversary stealth jets before engaging them, diminishing the enemy's stealth advantage and forcing them to a close quarter dogfight, where it has the theoretical advantage due to its 3-D thrust vectoring and supermaneuverability.
According to Bill Sweetman, the Su-57's high operational speed and altitude combined with its standoff weaponry could be hinting at its role as a "sort of airborne sniper", designed to fly fast and high to engage enemy support aircraft. This claim is supported by Russia's intentions to adapt the new R-37M (Izdeliye 810) air-to-air missile with range of more than 300 km to the Su-57's armament, giving it a role similar to the MiG-31BM interceptors. Newly designed anti-ship weapons could also enable the Su-57 to perform as a maritime strike aircraft.
Testing and trials
The 929th State Flight Test Centre (GLITS) received its first T-50 prototype for further testing and state trials in March 2014, and Russian Air Force Commander-in-Chief Lieutenant General Viktor Bondarev said that deliveries of initial production T-50 fighter were expected to begin in 2016. External weapon trials started in May 2014. In the event, the 2016 date for production was missed.
On 8 February 2018, then Deputy Minister of Defence Yury Borisov said that the first stage of state trials had been concluded and that the combat trials were on schedule. During the interview, he also reported that the contract for an initial batch of 12 aircraft was to be signed in 2018. First two serial units were ordered in August 2018, with term of delivery by 2020. State trials are to be complete in 2019.
Syrian combat evaluation
On 21 February 2018, two Su-57s were spotted landing at the Russian Khmeimim air base in Syria. The aircraft were deployed along with four Sukhoi Su-35 fighters, four Sukhoi Su-25s, and one Beriev A-50 AEW&C aircraft. Three days later two more Su-57s were reported to have arrived in Syria. The deployment was criticised by some experts as overly risky, especially after reports of drone attacks at Khmeimim air base. Military correspondent of Komsomolskaya Pravda Viktor Baranets was cited as saying that according to his information the Su-57s have "excellently" carried out their mission in Eastern Ghouta. On 1 March 2018, the Russian Defence Minister Sergey Shoygu confirmed that the two Su-57s indeed spent two days in Syria and successfully completed a trials program, including combat trials during which parameters of weapons work were monitored.
On 18 November 2018, the Russian Defence Ministry posted a video of the fighters' flights, and announced that Su-57 performed 10 flights during its deployment to Syria. However, the video did not specify when the test flights took place.
In May 2018, Turkish media Yeni Safak stated that Turkey might evaluate Su-57 purchase if the US cancels F-35 deliveries due to Turkey's S-400 purchase. However, internal source stated that the possibility of Su-57 purchase was based on expert's opinion and not reflecting the official position of Ankara. While on 30 June 2018, Turkey received its first F-35 in a ceremony at Lockheed Martin's facilities in Texas, The US ultimately expelled Turkey from the F-35 fighter programme after the first S-400 delivery in July 2019.
During Dubai Air Show in the UAE on 18 November 2019, Sergey Chemezov, in charge of Rostec, talked about the possibility of "localization" of portions of the Su-57 supply chain within other countries that decide to buy those jets, including '...United Arab Emirates, India or Turkey...', depends on the capabilities of the defense industrial base of the customer in question.
The completed joint Indian/Russian versions of the single-seat or two-seat FGFA will differ from the current T-50 flying prototypes in 43 ways with improvements to stealth, supercruise, sensors, networking, and combat avionics.
In March 2010, Sukhoi director Mikhail Pogosyan projected a market for 1,000 fighter aircraft over the next four decades, which will be produced in a joint venture with India, 200 each for Russia and India and 600 for other countries. He has also said that the Indian contribution would be in the form of joint work under the current agreement rather than as a joint venture. In June 2010, the Indian Air Force planned to receive 50 of the single-seat "Russian version" before receiving the two-seat FGFA. Then in an October 2012 interview the Chief of Air Staff of India, NAK Browne, said that the IAF will purchase 144 of the single-seat FGFA. To reduce development costs and timelines, the IAF plans to begin induction of the FGFA in 2020.
In April 2018, it was reported that India is withdrawing from the program. India has become increasingly disappointed with the project's progress after years of negotiations, delays, and struggles with Russia. India is also not satisfied with the capabilities of Su-57, the basis of the FGFA with one of the main issues being the Su-57's insufficient stealth design.
Alexei Fedorov has said that any decision on applying fifth-generation technologies to produce a smaller fighter (comparable to the F-35) must wait until after the heavy fighter, based on the T-50, is completed.
A naval version of the Su-57 was proposed for the Project 23000E or Shtorm supercarrier. Models of the aircraft carrier project are showing Su-57 on board, with folding wings and stabilators. The Su-57 should be able to use the takeoff ramp as well as the Electromagnetic Aircraft Launch System.
Although previously stated that the Su-57 is capable to fly on its own and act autonomously, it will not likely be developed into an unmanned version. Instead, the aircraft is used as a testbed for various subsystems (including weapon, control and navigation systems) being developed for Russia's future sixth-generation combat system, both in manned and unmanned version. In January 2019, it was reported the third flyable Su-57 prototype (bort. no 053) is being used for interaction with the Sukhoi S-70 Okhotnik UCAV, and testing of its avionics systems. On 27 September 2019, Russian MoD released a video showcasing the first flight of Okhotnik alongside Su-57. Reportedly the UAV operated autonomously and flew for more than 30 minutes interacting with the Su-57 to test extending the fighter's radar and target designation range for use of long-range air-launched weapons from the outside of enemy air defenses.
Sukhoi states that the main export advantage of the PAK FA is its lower cost than current US fifth generation jet fighters. Russia was reported to be offering the PAK FA for South Korea's next generation jet fighter. South Korea's defence procurement agency confirmed that the Sukhoi PAK FA was a candidate for the Republic of Korea Air Force's next-generation fighter (F-X Phase 3) aircraft; however, Sukhoi did not submit a bid by the January 2012 deadline.
The PAK FA was slated to be introduced for export in 2022 with the introduction of the Sukhoi/HAL FGFA, the primary export version, for the Indian Air Force. Ruslan Pukhov, director of the Centre for Analysis of Strategies and Technologies, has projected that Vietnam will be the second export customer for the fighter. In 2012, Russian Defence Minister Anatoly Serdyukov said that Russia and India would jointly build the export version of the T-50 starting in 2020. Mikhail Pogosyan, the head of United Aircraft Corporation, said in 2013 that the Russian PAK FA and the Sukhoi/HAL FGFA will use "identical onboard systems and avionics".
On 28 March 2019, an export version dubbed Su-57E, "E" for Eksportny ("Export"), was first promoted to international customers during the 2019 Langkawi International Maritime and Aerospace Exhibition. The aircraft was officially unveiled at the 2019 MAKS International Aviation and Space Salon.
On 10 June 2014, the fifth flying prototype, aircraft T-50-5, was severely damaged by an engine fire after landing. The pilot managed to escape unharmed. Sukhoi stated that the aircraft will be repaired, and that the fire "will not affect the timing of the T-50 test program".
- Crew: 1
- Length: 20.1 m (65 ft 11 in)
- Wingspan: 14.1 m (46 ft 3 in)
- Height: 4.74 m (15 ft 7 in)
- Wing area: 78.8 m2 (848 sq ft)
- Empty weight: 18,000 kg (39,683 lb)
- Gross weight: 25,000 kg (55,116 lb) typical mission weight, 29,270 kg (64,530 lb) at full load
- Max takeoff weight: 35,000 kg (77,162 lb)
- Fuel capacity: 10,300 kg (22,700 lb) internally
- Powerplant: 2 × Saturn AL-41F1 (initial production) turbofans with thrust vectoring, 93.1 kN (20,900 lbf) thrust each dry, 147.2 kN (33,100 lbf) with afterburner
- Powerplant: 2 × izdeliye 30 (later production) turbofans with thrust vectoring, 107.9 kN (24,300 lbf) thrust each dry, 176.6 kN (39,700 lbf) with afterburner
- Maximum speed: Mach 2 (2,120 km/h; 1,320 mph) at altitude
- Supercruise: Mach 1.6 (1,710 km/h; 1,060 mph) at altitude
- Range: 3,500 km (2,200 mi, 1,900 nmi) subsonic, 4,500 km from 2 outboard fuel tanks
- Supersonic range: 1,500 km (930 mi, 810 nmi)
- Service ceiling: 20,000 m (66,000 ft)
- g limits: +9.0
- Wing loading: 317 kg/m2 (65 lb/sq ft) typical mission weight
- AL-41F1: 1.02 (1.19 at typical mission weight)
- izdeliye 30: 1.15–1.2 (1.36 at typical mission weight)
- Guns: 1 × 30 mm Gryazev-Shipunov GSh-30-1 autocannon in right LEVCON root
- Hardpoints: 12 hardpoints (6 × internal, 6 × external)
- Air-to-air missiles:
- Air-to-surface missiles:
- Anti-ship missiles:
- 2 × Kh-35E, 31 etс.
- Anti-radiation missiles:
- Sh121 multifunctional integrated radio electronic system (MIRES)
- 101KS Atoll electro-optical targeting system
- 101KS-O: Laser Directional Infrared Counter Measures
- 101KS-V: Infra-red search and track
- 101KS-U: Ultraviolet missile approach warning system
- 101KS-N: advanced stabilised navigation and targeting system
- 101KS-N: optional external Targeting pod
- 101KS-P: thermal imager for low altitude flying and night landing
Aircraft of comparable role, configuration and era
- Second-stage T-50 prototypes feature compatibility with the Izdeliye 30 second-stage engine, a stronger fuselage, increased wingspan, and greater use of composite materials in construction.
- The Russian term изделие, translit. izdeliye literally means "manufactured article" or "product"
- The new fighter's control systems, avionics and cockpit will be designed on the basis of the Su-35BM's systems.
- "Т-50-Eng — Page 3". Т-50-Eng. Retrieved 4 December 2019.
- "Russia draws back veil of secrecy with peek at future fighter". RIA Novosti. 29 January 2010. Archived from the original on 10 May 2013. Retrieved 4 March 2019.
- Karnozov, Vladimir. "Russia Places Initial Production Order for Stealth Fighter". Aviation International News Online. Archived from the original on 13 July 2018. Retrieved 13 July 2018.
- "ЛИПЕЦКИЙ АВИАЦЕНТР СКОРО ПОЛУЧИТ ИСТРЕБИТЕЛИ ПЯТОГО ПОКОЛЕНИЯ СУ-57". RIA Novosti. 14 July 2018. Archived from the original on 21 July 2018. Retrieved 21 July 2018.
- "Russia launches serial production of Su-57 fifth-generation fighter jet - Sukhoi". TASS. 30 July 2019. Archived from the original on 25 August 2016. Retrieved 30 July 2019.
- Druzhinin, Alexei (28 September 2009). "Russian Navy to get fifth generation carrier fighter after 2020". RIA Novosti. Archived from the original on 8 October 2010. Retrieved 26 January 2011.
- Коц, Андрей (8 August 2017). "Эволюция ПАК ФА. Как менялся российский истребитель пятого поколения" (in Russian). RIA Novosti. Archived from the original on 11 August 2017. Retrieved 12 August 2017.
- Ведмеденко, Илья (7 August 2017). "Новый экземпляр Су-57 совершил свой первый полет, — источник". Naked Science (in Russian). Archived from the original on 7 August 2017. Retrieved 12 August 2017.
- "Совершил первый полет последний Су-57, — источник". News.rambler.ru. Archived from the original on 26 December 2017. Retrieved 3 January 2018.
- Pandit, Rajat (10 October 2009). "India, Russia to ink new military pact". Times of India. Archived from the original on 5 July 2013. Retrieved 11 May 2013.
- Shukla, Ajai (5 January 2010). "India, Russia close to PACT on next generation fighter". Business Standard. Archived from the original on 6 January 2010. Retrieved 4 January 2010.
- Shukla, Ajai (6 January 2010). "India to develop 25% of fifth generation fighter". Business Standard. Archived from the original on 8 January 2010. Retrieved 6 January 2010.
- "Russia's New Su-57 Fighters Cost Just $35 Million Each; Are Fifth Generation Jets Really Cheaper than the Su-35?". Cite journal requires
- "Mama I'm a Criminal: NATO Allegedly Assigns New Reporting Name for Russia's Su-57 Stealth Jet". Sputnik. 31 October 2019. Retrieved 2 November 2019.
- Demerly, Tom (1 November 2019). "NATO Code Name "FELON": Russian Su-57 Gets Its Reporting Name, And It Couldn't Be Better". theaviationist.com. Retrieved 2 November 2019.
- "Russia's 5th-generation fighter jet named as Su-57". TASS. Archived from the original on 12 August 2017. Retrieved 11 August 2017.
- "Минобороны и "Сухой" заключили контракт на поставку двух Су-57". TASS. 22 August 2018. Archived from the original on 23 August 2018. Retrieved 23 August 2018.
- "Т-50-2 fighter aircraft made the flight to Akhtubinsk". Sukhoi.org (Press release). 21 February 2014. Archived from the original on 27 April 2014. Retrieved 5 March 2014.
- "Sukhoi Company launches flight tests of PAK FA advanced tactical frontline fighter". Sukhoi.org (Press release). 29 January 2010. Archived from the original on 1 May 2011. Retrieved 26 January 2011.
- Cohen, Ariel (16 January 2009). "Russia bets on new Sukhoi fighter to match F-35". United Press International. Archived from the original on 5 February 2010. Retrieved 11 January 2010.
- "Новый двигатель с плазменной системой зажигания для Су-57. "Изделие 30" и искусство компромиссов". naukatehnika.com. 19 March 2019. Retrieved 15 June 2019.
- Druzhinin, Alexei. "Russian Air Force to buy over 60 fifth-generation fighters". RIA Novosti. Archived from the original on 5 August 2010. Retrieved 26 January 2011.
- Gordon, Yefim (2002). "Sukhoi S-37 and Mikoyan MFI: Russian Fifth-Generation Fighter Technology Demonstrators". Warbird Tech. 1. Hinckley, UK: Midland Publishing. ISBN 1-85780-120-2. Cite journal requires
- "Premier Putin satisfied with Russian fifth-generation fighter tests". RIA Novosti. 20 April 2010. Archived from the original on 10 May 2013. Retrieved 20 April 2010.
- Butowski, Piotr (1 November 2006). "MiG's Fifth Generation Fighter Builds up New Momentum". Russia & CIS Observer. Archived from the original on 14 May 2018. Retrieved 14 May 2018.
- Butowski, Piotr (22 June 2004). "Halfway to PAK FA: the latest addition to the Su-27 family seeks to bridge the gap to the fifth generation combat aircraft". Interavia Business & Technology. Aerospace Media Publishing – via HighBeam Research (subscription required). OCLC 71365085. Archived from the original on 24 September 2015. Retrieved 19 April 2013.
- Butowski, Piotr (22 September 2007). "Wraps come off new Russian fighters: Russia's so-called "intermediate-generation" fighters made their debut at MAKS 2007". Interavia Business & Technology. Aerospace Media Publishing – via HighBeam Research (subscription required). OCLC 71365085. Archived from the original on 5 November 2013. Retrieved 19 April 2013.
- Perry, Dominic (10 June 2014). "Fire damages PAK-FA prototype on landing". Flightglobal. Archived from the original on 14 June 2014. Retrieved 12 June 2014.
- "KnAAPO PAK FA information page". Archived from the original on 8 March 2014. Retrieved 23 June 2014.
- Cheberko, Ivan (8 April 2010). "Creating an engine for the fifth generation fighter". Marker(JSC)(RU). Archived from the original on 13 January 2016. Retrieved 23 June 2014.
- "Russia to build fifth-generation fighter prototype soon". RIA Novosti. 8 August 2007. Archived from the original on 16 August 2007. Retrieved 8 August 2007.
- "Russia's next-generation warplane to make maiden flight in 2009". RIA Novosti. 21 January 2009. Archived from the original on 18 May 2013. Retrieved 26 January 2009.
- "The contract to develop a sketch and technical project of the Russian-Indian 5th -generation fighter was completed". Sukhoi.org (Press release). Archived from the original on 5 October 2013. Retrieved 16 November 2013.
- "India, Russia to ink new military pact". The Times of India. 10 October 2009. Archived from the original on 5 July 2013. Retrieved 11 May 2013.
- "India, Russia to Ink gen-5 fighter pact". Business Standard. Archived from the original on 6 October 2012. Retrieved 19 November 2012.
- "Russia, India to begin design of 5G-fighter in December". RIA Novosti. 27 October 2010. Archived from the original on 19 October 2012. Retrieved 19 November 2012.
- "IAF to induct 214 variants of fighter aircraft - Times of India". The Times of India. Archived from the original on 31 January 2019. Retrieved 31 January 2019.
- Mathews, Neelam. "Indian Air Force Chief Outlines Fighter Jet Plans". Aviation International News. Archived from the original on 31 January 2019. Retrieved 31 January 2019.
- "..:: India Strategic ::. Air Force: IAF decides on 144 Fifth Generation Fighters". indiastrategic.in. Archived from the original on 28 September 2013. Retrieved 31 January 2019.
- Diplomat, Franz-Stefan Gady, The. "India and Russia Fail to Resolve Dispute Over Fifth Generation Fighter Jet". The Diplomat. Archived from the original on 27 March 2019. Retrieved 31 January 2019.
- "India withdraws from FGFA project, leaving Russia to go it alone". Janes 360. 20 April 2018. Archived from the original on 7 November 2018. Retrieved 7 November 2018.
- "Is there a future for the SU-57?". Defence IQ. 17 September 2018. Archived from the original on 7 November 2018. Retrieved 7 November 2018.
- "PAK FA - Russia Special Report". Flightglobal. 2 August 2011. Archived from the original on 28 May 2014. Retrieved 10 May 2014.
- "Russian air forces started the state testing of T-50 fighter". Russian Aviation. Archived from the original on 2 June 2014. Retrieved 28 May 2014.
- Druzhinin, Alexei. "Russian military to buy 60 fifth-generation fighters after 2016". RIA Novosti. Archived from the original on 5 August 2010. Retrieved 26 January 2011.
- "'Better than US-made 5G': PAK-FA fighter to engage sea, air & ground targets". RT International. Archived from the original on 31 January 2019. Retrieved 30 January 2019.
- Safronov, Ivan (25 March 2015). "Russian Air Force to buy fewer PAK FA fighter aircraft". Russia & India Report. Archived from the original on 5 November 2016. Retrieved 9 April 2017.
- "Fewer PAK FA". RBTH. Archived from the original on 27 July 2015.
- Sweetman, Bill (21 December 2013). "T-50 Update". Aviation Week. Archived from the original on 28 May 2014. Retrieved 24 May 2014.
- "Russian 5G fighter to go into serial production in 2017 – top brass". Archived from the original on 24 January 2016. Retrieved 24 January 2016.
- Majumdar, Dave. "Russia's Fearsome PAK-FA Stealth Fighter Will Enter Service in 2018". The National Interest. Archived from the original on 9 April 2017. Retrieved 9 April 2017.
- "Первый контракт на поставку истребителей Су-57 заключат в ближайшее время" (in Russian). Archived from the original on 1 July 2018. Retrieved 30 June 2018.
- Sputnik. "Russian Military to Ink Contract for First Batch of Su-57 Fighters". sputniknews.com. Archived from the original on 19 July 2018. Retrieved 19 July 2018.
- "Первые истребители Су-57 готовы к отправке в войска". Russia-24. 30 June 2018. Archived from the original on 21 July 2018. Retrieved 21 July 2018.
- Gady, Franz-Stefan. "Russia Will Not Mass-Produce 5th Generation Stealth Fighter Jet". The Diplomat. Archived from the original on 13 July 2018. Retrieved 21 July 2018.
- Lockie, Alex. "Russia admits defeat on its 'stealth' F-35 killer by canceling mass production of the Su-57 fighter jet". Business Insider. Archived from the original on 17 July 2018. Retrieved 21 July 2018.
- Rogoway, Joseph Trevithick and Tyler. "No, Russia's Su-57 Stealth Fighter Program Isn't Dead, At Least Not Yet". Thedrive.com. Archived from the original on 21 July 2018. Retrieved 28 July 2018.
- "Источник: контракт на поставку 13 Су-57 для ВКС России планируется подписать в 2020 году". TASS. 15 January 2019. Archived from the original on 16 January 2019. Retrieved 17 January 2019.
- "Putin says 76 Su-57 jets to be purchased before 2028". TASS. 15 May 2019. Archived from the original on 17 May 2019. Retrieved 18 May 2019.
- "Минобороны получит 76 истребителей Су-57". TASS. 27 June 2019. Retrieved 28 June 2019.
- "Russian Defense Ministry to get 76 Su-57 fighter jets". TASS. 27 June 2019. Retrieved 28 June 2019.
- "На "Армии-2019" подписаны контракты на боеприпасы для Су-57". TASS. 27 August 2019. Retrieved 17 November 2019.
- Halpin, Tony (30 January 2010). "Russia unveils its first stealth fighter jet - the Sukhoi T-50". The Times. Archived from the original on 4 June 2011. Retrieved 7 February 2010.
- "Sukhoi PAK FA Updates: First Prototype by August 2009, Special Software for Indian Versions". India Defence. 28 February 2009. Archived from the original on 4 March 2009. Retrieved 13 March 2009.
- Solovyov, Dmitry (20 August 2009). "Interview: Russia's new fighter to fly by yr-end - Sukhoi". Reuters. Archived from the original on 16 January 2010. Retrieved 20 August 2009.
- "Russia to start 5th generation fighter tests in 2010 – deputy PM". RIA Novosti. 8 December 2009. Archived from the original on 13 December 2009. Retrieved 8 December 2009.
- "Начались испытания российского истребителя пятого поколения" [Russian fifth-generation fighter tests have begun]. Lenta.ru. 24 December 2009. Archived from the original on 27 December 2009. Retrieved 26 December 2009.
- "Sukhoi fifth-generation fighter taxiing". BBC Russian Service. 24 December 2009. Archived from the original on 13 January 2010. Retrieved 30 December 2009.
- Reed Business Information Limited. "PICTURES & VIDEO: Sukhoi's PAK FA fighter completes first flight". Flightglobal.com. Archived from the original on 16 February 2014. Retrieved 14 November 2014.
- "Sukhoi Company launches flight tests of PAK FA advanced tactical frontline fighter". Sukhoi.org (Press release). 29 January 2010. Archived from the original on 1 May 2011.
- Pandit, Rajat. "1st test of 5-Gen fighter in Russia". Times of India. Archived from the original on 29 March 2012. Retrieved 26 January 2011.
- "Russia tests 2nd prototype of fifth-generation fighter". RIA Novosti. 2011. Archived from the original on 5 March 2011. Retrieved 3 March 2011.
- "Second prototype fifth-generation fighter to fly before yearend". RIA Novosti. 22 November 2010. Archived from the original on 25 November 2010. Retrieved 22 November 2010.
- "ОАО "Компания "Сухой" - Новости - Новости компании"". Sukhoi.org (Press release). Archived from the original on 16 July 2011. Retrieved 26 January 2011.
- Komarov, Alexey (8 March 2010). "Three More Sukhoi T-50 Prototypes To Fly in Next 12 Months". Aviation Week. Retrieved 30 January 2019.
- "Fifth-gen fighter PAK FA goes supersonic" Archived 17 March 2011 at the Wayback Machine. RT. Retrieved: 12 April 2011.
- "Russia shows off Sukhoi T-50 stealth fighter" Archived 5 April 2018 at the Wayback Machine. BBC News, 17 August 2011.
- Miranovsky, Anatoly. "Russia to export 600 Sukhoi PAK FA fifth generation jets. India to acquire and jointly develop 250 sukhoi T-50 this fifth generation fighters with Russia" Archived 15 September 2010 at the Wayback Machine. Pravda. Retrieved: 26 January 2011.
- "PAK-FA programme: 100th test performed yesterday" Archived 5 October 2013 at the Wayback Machine. WAPA, 4 November 2011.
- Karnozov, Vladimir. "Sukhoi T-50 Moves to Radar, In-flight Refueling Tests" Archived 14 September 2014 at the Wayback Machine. Aviation International News, 31 August 2012.
- "Sukhoi Company adds the third PAK FA prototype to flight tests program". Sukhoi.org (Press release). Archived from the original on 26 April 2012. Retrieved 28 September 2012.
- Sysoev, Grigoriy (13 February 2012). "Russia to Increase Number of 5G Fighters in Test Flights". RIA Novosti. Archived from the original on 17 April 2012. Retrieved 16 October 2014.
- Trimble, Stephen (21 November 2011). "Third PAK-FA prototype breaks cover". Flightglobal. Archived from the original on 25 November 2011. Retrieved 22 November 2011.
- "Sukhoi Begins Testing Onboard Radar System for T-50 Aircraft". Sukhoi Company, 8 August 2012.
- "Fourth T-50 Stealth Fighter Flies" Archived 1 February 2019 at the Wayback Machine. Sputnik news, 12 December 2012.
- "Russian T-50 Fighter Jet Completes First Long-Range Flight". 17 January 2013. Archived from the original on 22 January 2013. Retrieved 17 January 2013.
- "T-50-4 made the first flight from Komsomolsk-on-Amur to Zhukovsky". Sukhoi.org (Press release). Archived from the original on 23 January 2013.
- "Fifth PAK FA fighter aircraft made its first flight in Komsomolsk-on-Amur". Sukhoi.org (Press release). 28 October 2013. Archived from the original on 11 November 2013. Retrieved 16 November 2013.
- "Russian Air Force Receives New Stealth Fighter Prototype". RIA Novosti. 21 February 2014. Archived from the original on 22 February 2014. Retrieved 21 February 2014.
- Butowski, Piotr. Combat Aircraft, January 2011, p. 55.
- "6th flying prototype PAK FA in the air". BMPD. Archived from the original on 30 April 2016. Retrieved 29 April 2016.
- "Т-50 – Альбомы" (in Russian). KnAAPO. Archived from the original on 13 August 2017. Retrieved 12 August 2017.
- "Эволюция ПАК ФА. Как менялся российский истребитель пятого поколения". РИА Новости (in Russian). 8 August 2017. Archived from the original on 11 August 2017. Retrieved 30 November 2018.
- "VIDEO: Russia flies first Su-57 fitted with new Product 30 engine". Flightglobal.com. 5 December 2017. Archived from the original on 8 December 2017. Retrieved 8 December 2017.
- "Су-57 / Т-50 / И-21 / ПАК ФА". Military Russia (in Russian). 12 August 2017. Archived from the original on 6 September 2017. Retrieved 10 September 2017.
- Щеголев, Илья (21 October 2015). "Т-50-5 совершил первый полет после капремонта" (in Russian). Rossiyskaya Gazeta. Archived from the original on 13 August 2017. Retrieved 12 August 2017.
- bmpd (31 July 2017). "Как сообщается, серийный вариант истребителя Т-50 получил официальное наименование Су-57". bmpd. Archived from the original on 25 February 2018. Retrieved 6 December 2018.
- "Russia - Air Force Sukhoi T-50 photo by Artyom Anikeev - AviaPressPhoto". airplane-pictures.net. Retrieved 27 August 2019.
- "Первые фотографии самолета Т-50-9" (in Russian). BMPD. 13 May 2017. Archived from the original on 10 August 2017. Retrieved 12 August 2017.
- "Совершил первый полет последний прототип Су-57, — источник" (in Russian). Naked Science. 25 December 2017. Archived from the original on 9 January 2018. Retrieved 9 January 2018.
- "В РФ начались летные испытания десятого истребителя пятого поколения Су-57" (in Russian). Interfax. 6 January 2018. Archived from the original on 8 January 2018. Retrieved 9 January 2018.
- Karnozov, Vladimir (29 January 2010). "Sukhoi's PAK FA fighter completes first flight". Flightglobal. Archived from the original on 16 February 2014. Retrieved 1 February 2010.
- "Patent on PAK FA aerodynamics Archived 26 June 2015 at the Wayback Machine. Retrieved: 2 January 2015.
- Butowski 2013, p. 78.
- "2 new videos show Russian Su-57s fighters landing at the same time and performing flat spins". Business Insider. 27 November 2018. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- "Su-57 fifth-generation jets show unbelievable manoeuvrability in the air - New Russian weapons". PravdaReport. 22 November 2018. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- Sweetman, Bill (19 August 2013). "Sukhoi T-50 Shows Flight-Control Innovations". Aviation Week. Archived from the original on 20 October 2013. Retrieved 16 November 2013.
- "Su-57". deagel.com. Archived from the original on 14 January 2019. Retrieved 14 January 2019.
- "Sukhoi Su-57 (T-50 / PAK FA) 5th Generation Multi-Role Stealth Aircraft - Russian". nmilitaryfactory.com. Archived from the original on 7 August 2018. Retrieved 14 January 2019.
- Sputnik. "How Russian PAK FA 5th Gen Fighter Evolved (PHOTO, VIDEO)". sputniknews.com. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- Sputnik. "Aerial Ghosts: Russia's Autonomous 5th Gen Su-57 to Dominate the Skies". sputniknews.com. Archived from the original on 6 December 2018. Retrieved 6 December 2018.
- Lake 2010, pp. 26–33.
- "Mikhail Pogosyan: T-50 will Provide Reliable Protection Boundaries" Archived 24 October 2014 at the Wayback Machine. AviaPort.ru, 20 May 2013. Retrieved: 15 July 2014.
- Sputnik. "Endurance Run: WATCH Russia's Su-57 Stealth Fighter Practice In-Flight Refueling". sputniknews.com. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- Sweetman, Bill. "New moves". Aviation Week and Space Technology, 10 August 2013. p. 43.
- Butowski 2012, p. 50.
- "PAK FA stealth features patent published". Jane's Information Group. 10 January 2014. Archived from the original on 23 October 2014. Retrieved 21 July 2018.
- "Russia's newest fighter jet is 5th-generation 'in name only'". Businessinsider.com. Archived from the original on 21 August 2016. Retrieved 14 August 2016.
- "'Carbon Ghosts': How Coal Plastic Will Help Russian Planes to Dodge Enemy Radar". sputniknews.com. Retrieved 4 December 2019.
- "Russia's 5th-generation fighter jet gets advanced stealth coating". TASS. 11 January 2019. Archived from the original on 15 January 2019. Retrieved 14 January 2019.
- Lockie, Alex (14 May 2018). "Close-up photos of Russia's new 'stealth' jet reveal its true purpose -- and it's a big threat to the US". Business Insider Australia. Retrieved 27 August 2019.
- "Su-57 has finer craftsmanship; weapons bay needs improvement". Global Times (globaltimes.cn). Retrieved 30 August 2019.
- Butowski, Piotr. "Russian Supercruiser". Air International, February 2011, p. 34. Stamford, UK: Key Publishing.
- "PAK FA stealth features patent published". Jane's. 9 January 2014. Archived from the original on 9 January 2014. Retrieved 9 January 2014.
- Plopsky, Guy and Fabrizio Bozzato. "The F-35 vs. The VHF Threat" Archived 26 December 2014 at the Wayback Machine. The Diplomat, 21 August 2014.
- Ralston, J; Heagy, J; et al. "Environmental/Noise Effects on UHF/VHF UWB SAR" Archived 2 January 2015 at the Wayback Machine. dtic.mil, September 1998. Retrieved: 2 January 2015.
- "NPO." Archived 1 February 2010 at the Wayback Machine Saturn Press Release, 29 January 2010. Retrieved: 26 January 2011.
- Butowski 2013, p. 79.
- "Яндекс.Народ". Archived from the original on 23 October 2010. Retrieved 30 October 2010.
- "Safety". RIA Novosti. Archived from the original on 6 April 2010. Retrieved 26 January 2011.
- Shukla, Ajai. "Russia can't deliver on Fifth Generation Fighter Aircraft: IAF". Archived 21 October 2014 at the Wayback Machine business-standard.com, 21 January 2014.
- "Russian Air Force to Receive the First Production Su-57 in 2018 - Defense Update:". Defense-update.com. 17 December 2017. Archived from the original on 21 December 2017. Retrieved 18 December 2017.
- "The testing of a new engine intended for PAK FA will be started in 2014". - Russian Aviation Archived 23 October 2014 at the Wayback Machine, RuAviation.com, 15 November 2012. Retrieved: 19 November 2012.
- "Т-50 с двигателями "изд. 30" совершит первый полет в 2017 году". vpk.name. Archived from the original on 10 December 2014. Retrieved 1 April 2015.
- Butowski 2015, p. 81
- "Стали известны сроки первого полета Су-57 с новыми двигателями". Rossiyskaya Gazeta. Archived from the original on 26 September 2017.
- Kozlov, Dmitry. Press conference of "Saturn" Archived 20 October 2014 at the Wayback Machine (RU). AviaPort.ru (RU), 16 July 2013. Retrieved: 21 May 2014.
- "Russia's Su-57 fifth-generation fighter makes first flight with new engine". Tass.com. Archived from the original on 6 December 2017. Retrieved 6 December 2017.
- Butowski 2010, pp. 34.
- Butowski, Piotr. Russia and CIS Observer. 17 June 2007.
- "Vympel plans to develop air-to-air missiles for Russia's PAK FA fighter". Jane's Missiles and Rockets. 19 May 2006
- "PAK FA will complement digital missiles" Archived 22 October 2014 at the Wayback Machine. Machine Resource www.i-mash.ru (RU), 3 December 2013. Retrieved: 4 April 2014.
- Tahar, Abraham Ait (26 May 2018). "The Su-57 is Only as Dangerous as its Best Missile; Why the K-77 Will be a Game Changer for the Russian Air Force". Military Watch Magazine. Retrieved 27 August 2019.
- Barrie, Douglas and Pyadushkin, Maxim. "R-77, R-73 Missile Upgrades Emerge". Aviation Week. 13 August 2009
- "Russia to Field Air-Launched Missiles for T-50 by 2014". RIA Novosti. 31 January 2012. Archived from the original on 4 February 2012. Retrieved 13 February 2012.
- "India planning to Deploy Brahmos on PAK T-50 FGFA". 12 March 2011. Archived from the original on 16 January 2012. Retrieved 4 May 2012.
- "Истребитель пятого поколения Су-57 получит на вооружение гиперзвуковую ракету". bmpd.livejournal.com. 7 December 2018. Retrieved 27 December 2018.
- "Российский самолет пятого поколения Т-50 получит улучшенную авиапушку". vpk.name. Archived from the original on 7 April 2015. Retrieved 1 April 2015.
- "5G fighter's rapid-fire cannon test-fired in Russia (VIDEO)". RT International. Archived from the original on 8 December 2018. Retrieved 30 November 2018.
- Sputnik. "Test of Gun for Russia's PAK FA 5th-Gen Stealth Aircraft Spotted on Video". sputniknews.com. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- "Video of live fire tests of the Russian T-50 stealth fighter's 30 mm gun appears online". The Aviationist. 18 September 2016. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- Butowski, Piotr. "Russian Supercruiser". Air International, February 2011, pp. 35-38. Stamford, UK: Key Publishing.
- Trimble, Stephen (2 March 2010). "Sukhoi reveals T-50 cockpit layout and static airframe". Flightglobal. Archived from the original on 15 December 2013. Retrieved 28 March 2014.
- "Rarefied air: Russian 5G fighters boast cutting-edge life support systems". RT International. Archived from the original on 15 August 2018. Retrieved 6 December 2018.
- Butowski, Piotr. "Russian Supercruiser". Air International, February 2011, pp. 38. Stamford, UK: Key Publishing.
- "PAK FA fighter was fitted with advanced oxygen supply system". - Russian Aviation Archived 23 October 2014 at the Wayback Machine, RuAviation.com, 19 July 2013
- "The pilots of T-50 fighters received new anti-G equipment - Russian Aviation". RuAviation.com. 9 July 2013. Archived from the original on 16 October 2013. Retrieved 16 November 2013.
- Sputnik. "Russian Su-57 Fighter Jet Pilots Start Testing Antigravity Suits - Source". Sputniknews.com. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- Sputnik. "Unique Capabilities of PAK FA Pilot's Gear Unveiled". sputniknews.com. Archived from the original on 6 March 2019. Retrieved 4 March 2019.
- Butowski 2011, p. 66.
- Rogoway, Tyler. "No, The Su-57 Isn't 'Junk:' Six Features We like on Russia's New Fighter". The Drive. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- "NIIP Institute Page". Niip.ru. Archived from the original on 18 December 2014. Retrieved 14 November 2014.
- "Sukhoi Tests New Radar Array for 5th-Generation Fighter." Archived 13 August 2012 at the Wayback Machine RIA Novosti, 8 August 2012.
- "Новейший российский истребитель получил один из ключевых элементов" [The newest Russian fighter got one of the key elements]. RIA Novosti. 24 April 2013. Archived from the original on 28 April 2014. Retrieved 29 April 2014.
- "Certification tests of the communication system for Su-57 will be completed this year - News - Russian Aviation - RUAVIATION.COM". ruaviation.com. Retrieved 30 January 2019.
- "Communication equipment for Sukhoi-57 jet to be completed in 2017". Tass.com. Archived from the original on 30 December 2017. Retrieved 18 December 2017.
- "Sukhoi-57's Targetting Pod 101KS-N Spotted". Global Defence Watch. Archived from the original on 3 December 2018.
- Rogoway, Tyler. "Su-30s Acted As Infrared "Heat Traps" For Putin's Arrival in Syria Aboard A Tu-214PU". The Drive. Archived from the original on 3 December 2018. Retrieved 3 December 2018.
- Tahar, Abraham Ait (1 April 2019). "Russia's Su-57 Next Generation Fighter Shoots Lasers to Blind Enemy Missiles - A Look at the Directional Infrared Countermeasures System". Military Watch Magazine. Retrieved 27 August 2019.
- Asavathanachart, Nawaponrath (20 August 2018). "Military and Commercial Technology: Su-57 with 101KS-N navigation and targeting pod". Military and Commercial Technology. Archived from the original on 3 December 2018. Retrieved 3 December 2018.
- "Sukhoi Su-57 in colours (PAK FA, Prospective Air Complex of Front-Line Aviation). Sukhoi Su-57 fighter camouflage and painting schemes. Prototypes and serial production, deliveries, units, numbers. Russian Air Force". www.su57.mariwoj.pl. Retrieved 1 December 2019.
- Butowski 2013, p. 80.
- "Su-57 tests targeting pod | Air Forces Monthly". airforcesmonthly.keypublishing.com. Retrieved 3 December 2018.
- D'Urso, Stefano (1 August 2019). "Sukhoi Begins Serial Production of the Su-57, Meanwhile Let's See What We Know About Russia's 5th Generation Stealth Jet". The Aviationist. Retrieved 13 August 2019.
- "Sukhoi T-50 Aircraft To Get New Navigation System". www.defenseworld.net. Retrieved 1 December 2019.
- "КРЭТ разрабатывает новейшую систему обнаружения целей для ПАК ФА". ria.ru. 29 July 2016. Archived from the original on 21 February 2019. Retrieved 21 February 2019.
- "KRET develops new Okhotnik target detection system for Russia's PAK FA fighter jet". airrecognition.com. 1 August 2016. Archived from the original on 21 February 2019. Retrieved 21 February 2019.
- Uacrussiawrote, 2017-04-14 11:36:00 Uacrussia Uacrussia 14 April 2017 11:36:00. "Многоядерный Т-50: на новом российском истребителе ИМА БК заменила "Багет"". Archived from the original on 16 April 2017. Retrieved 21 April 2017.
- "Russia Completes Testing of Su-57 Avionics 'Complex' - Avionics". Avionics. 23 November 2018. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- "Russia Completes Testing of Su-57 Avionics System Upgrade - Defense Daily Network". Defense Daily Network. 21 November 2018. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- "Министерство обороны РФ сертифицировало новейшую операционную систему реального времени "БагрОС-4000" для многоядерных процессоров, разработанную ПАО "Компания «Сухой"". sukhoi.org. 26 February 2019. Archived from the original on 28 February 2019. Retrieved 29 April 2019.
- "Sukhoi starts testing new IMA BK FMS on Russia's PAK FA fighter". airrecognition.com. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- "Russia Starts Flight Tests of Next-Gen Integrated Avionics Suite of PAK-FA Fighter Jet". defenseworld.net. Archived from the original on 20 April 2017. Retrieved 6 December 2018.
- "В России разработали "нервную систему" для самолетов будущего". Ria.ru. 11 July 2017. Archived from the original on 8 December 2017. Retrieved 8 December 2017.
- "FPI presented a model of the "nervous system" of the future fighter". Weaponews.com. Archived from the original on 8 December 2017. Retrieved 8 December 2017.
- Sputnik. "Sky Warrior: Russia's T-50 PAK FA Super Fighter Gets a 'Nervous System'". sputniknews.com. Retrieved 27 August 2019.
- "Sukhoi Test Pilot Explains 'Supermaneuverability'". Aviation Week Network.
- Cenciotti, David (19 August 2015). "This cool infographic shows all weapons carried by Russia's next generation fighter". The Aviationist. Retrieved 13 August 2019.
- Axe, David (30 August 2013). "Russia's Stealth Fighter Could Outfly, Outshoot American Jets". Medium. Retrieved 4 August 2019.
- "Russia's Su-57 jet gets hypersonic missile that can shoot down enemy aircraft '300km away'". rt.com. 26 September 2018. Retrieved 26 August 2019.
- Peck, Michael (13 July 2019). "Dead Battleship: Russia's Su-57 Is a Deadly Warship Killer". The National Interest. Retrieved 13 August 2019.
- "Su-57 fighter jets to get advanced anti-ship missile - News - Russian Aviation - RUAVIATION.COM". ruaviation.com. Retrieved 13 August 2019.
- "The state testing of PAK FA will be started in Akhtubinsk in March or April 2014". - Russian Aviation Archived 6 October 2014 at the Wayback Machine, RuAviation.com, 3 March 2014.
- "Russia to deploy fifth-generation fighter aircraft PAK FA in 2016". 11 August 2014. Archived from the original on 13 August 2014. Retrieved 13 August 2014.
- "Wall". vk.com. Retrieved 1 April 2015.
- "Russia's defense ministry to sign contract for 12 Su-57 fighter jets". TASS. 8 February 2018. Archived from the original on 25 February 2018. Retrieved 24 February 2018.
- "Russia to Complete State Tests of Su-57 Fifth-Generation Fighter in 2019". Sputnik (news agency). 12 August 2019. Retrieved 12 August 2019.
- "MAKS 2019: Russia unveils export variant of Su-57". janes.com. 30 August 2019. Retrieved 31 August 2019.
- "Russia's Su-57 jet lands in Turkey for Technofest". TASS. 14 September 2019. Retrieved 15 September 2019.
- "Alleged PHOTO, VIDEO of Russian Su-57 Fifth Gen Jet in Syria Released on Twitter". Sputnik (news agency). 22 February 2018. Archived from the original on 24 February 2018. Retrieved 24 February 2018.
- Seidel, Jamie. "Syria: Russian Su-57 stealth fighter spotter landing". News.com.au. Archived from the original on 22 February 2018. Retrieved 22 February 2018.
- СМИ сообщили о прибытии еще двух истребителей Су-57 в Сирию Archived 25 February 2018 at the Wayback Machine RIA Novosti, 24 February 2018.
- Переброска Су-57 в Сирию несет в себе значительный риск Archived 24 February 2018 at the Wayback Machine vz.ru, 22 February 2018.
- Trevithick, Joseph. "Russia Releases First Official Video of Its Su-57s on Their Absurdly Short Trip To Syria". The Drive. Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- "Русская линия". Военный эксперт об отправке в Сирию Су-57 Archived 6 March 2018 at the Wayback Machine RIA Novosti, 26 February 2018.
- Новейшие истребители Су-57 прошли боевые испытания в Сирии - Шойгу Archived 4 March 2018 at the Wayback Machine Zvezda, 1 March 2018.
- Su-57 fifth-generation fighter jets successfully tested in Syria Archived 2 March 2018 at the Wayback Machine TASS, 1 March 2018.
- "Alert 5 » Su-57 launched cruise missile while deployed to Syria - Military Aviation News". alert5.com. Archived from the original on 27 May 2018. Retrieved 26 May 2018.
- "Russian Military Unveils Video Footage of New Su-57 Stealth Fighter in Syria". Retrieved 30 November 2018.
- "Russia's 5th-generation fighter jets make 10 flights in Syria". TASS (in Russian). Archived from the original on 30 November 2018. Retrieved 30 November 2018.
- "Russia 'Tests' Su-57 Stealth Fighter Jet's Onboard Systems, Weapons in Syria". Defenseworld.net. Archived from the original on 30 November 2018.
- Şafak, Yeni (27 May 2018). "S-400'den sonra SU uçakları". Yeni Şafak (in Turkish). Archived from the original on 6 December 2018. Retrieved 6 December 2018.
- "Turkey May Buy Russian Su-57 Jets, If Delivery of F-35 Jets Suspended - Reports". sputniknews.com. Archived from the original on 6 December 2018. Retrieved 6 December 2018.
- Sputnik. "Turkey Cannot Confirm Plans to Purchase Su-57 Jets Instead of F-35 - Source". sputniknews.com. Archived from the original on 6 December 2018. Retrieved 6 December 2018.
- "Turkey Received Delivery of Its First F-35 Aircraft". F-35 Lightning II.
- "U.S. to stop training Turkish F-35 pilots because of Russia deal:..." Reuters. 7 June 2019. Retrieved 13 August 2019.
- "Russia 'ready to cooperate' to sell Turkey Su-57 fighter jets". hurriyetdailynews.com. Hürriyet Daily News. 3 May 2019. Archived from the original on 4 May 2019. Retrieved 6 May 2019.
- "Turkey in 'talks' on buying Russian Su-57 jet fighters – Erdogan". rt.com. 30 August 2019. Retrieved 15 September 2019.
- Trevithick, Joseph. "Russia Says UAE Could Help Build Su-57s As Gulf Nation Puts F-35 Ambitions On Hold". The Drive. Retrieved 2 December 2019.
- Mathews, Neelam. "India’s Version of Sukhoi T-50 Delayed by Two Years." Archived 7 July 2014 at the Wayback Machine AIN, 25 May 2012.
- Bryanski, Gleb (12 March 2010). "Russia to make 1,000 stealth jets, eyes India deal". Reuters. Archived from the original on 21 August 2017. Retrieved 26 January 2011.
- Mikhail. Kutuzov. "Russian-Indian work on 5G fighter to go ahead without extra deal." Archived 14 June 2010 at the Wayback Machine rian.ru, 11 June 2010. Retrieved: 26 January 2011.
- "No JV with India on fifth-gen fighter: Sukhoi chief." Archived 17 June 2010 at the Wayback Machine brahmand.com, 13 June 2010. Retrieved: 26 January 2011.
- "India withdraws from FGFA project, leaving Russia to go it alone". Jane's 360. 20 April 2018. Archived from the original on 23 May 2018.
- "It's No Surprise India Finally Ditched Its Stealth Fighter Program With Russia". The Drive. 23 April 2018. Archived from the original on 26 April 2018.
- "India Pulls out of Joint Stealth Fighter Project With Russia". The Diplomat. 23 April 2018. Archived from the original on 26 April 2018.
- "Легкий истребитель 5-го поколения будет создан на базе технологий тяжелого перспективного истребителя (in Russian)". Archived 18 September 2011 at the Wayback Machine arms-tass.su. Retrieved: 26 January 2011.
- "IHS Jane's: в России разработали новый ядерный суперавианосец". Ria.ru. 20 May 2015. Archived from the original on 22 September 2017. Retrieved 21 September 2017.
- Sputnik. ""Schwimmendes Hmeimim": Modernste Waffen für Russlands atomgetriebenen "Seesturm"". de.sputniknews.com. Archived from the original on 22 September 2017. Retrieved 21 September 2017.
- "Russia's Su-57 plane tests onboard systems for 6th-generation fighter jet – source". TASS. 16 July 2018. Archived from the original on 17 July 2018. Retrieved 21 February 2018.
- "Russian Fifth-Gen Stealth Fighter to Get Artificial Intelligence – Source". Sputnik (news agency). 24 August 2018. Archived from the original on 24 August 2018. Retrieved 21 February 2018.
- "Источник: бортовые системы истребителя шестого поколения испытывают на Су-57". TASS. 16 July 2018. Archived from the original on 28 July 2018. Retrieved 23 July 2018.
- "Russia may upgrade advanced Su-57 aircraft to 6th-generation fighter jet". TASS. Retrieved 27 August 2019.
- "Источник: системы БПЛА "Охотник" испытывают на Су-57". TASS. 29 January 2019. Archived from the original on 31 January 2019. Retrieved 21 February 2019.
- "Russia's Okhotnik UAV makes first flight with Su-57". janes.com. 27 September 2019. Retrieved 27 September 2019.
- "Russia's fifth-generation fighter to be cheaper than foreign analogues" Archived 3 September 2014 at the Wayback Machine.
- Tae-hoon, Lee. "Russia seeks to sell stealth jets to Korea" Archived 29 September 2011 at the Wayback Machine. Korea Times, 20 July 2011.
- "South Korea confirms Sukhoi T-50's surprise entry into FX fighter contest". 22 July 2011. Archived from the original on 16 September 2012. Retrieved 24 July 2011.CS1 maint: BOT: original-url status unknown (link)
- Lee, Tae-Hoon. "Russia pulls out of Korea fighter project" Archived 31 January 2012 at the Wayback Machine. The Korean Times, 29 January 2012. Retrieved: 30 January 2012.
- Bogdanov, Konstantin. "Russia’s Changing Aircraft Export Strategy" Archived 23 July 2014 at the Wayback Machine. RIA Novosti, 9 July 2012.
- "Sukhoi: Development of PAK FA is going on without any failures" Archived 23 October 2014 at the Wayback Machine Russian Aviation, 28 July 2011.
- Johnson, Reuben F. "Russian think-tank projects additional Su-30, PAK-FA exports" Archived 12 August 2010 at the Wayback Machine. Jane's via cast.ru, 13 May 2010. Retrieved: 26 January 2011.
- "India to Build Export T-50 Stealth Fighter by 2020". RIA Novosti, 10 October 2012.
- "Russia, India Describe Next-Gen Fighter Plans" Archived 12 October 2014 at the Wayback Machine.
- "Russia to Offer Brazil Stake in Future Advanced Fighter Project". RIA Novosti. 14 October 2013. Archived from the original on 14 October 2013. Retrieved 14 October 2013.
- "Russia proposes to Brazil a joint agreement to produce Sukhoi T-50 PAK-FA". 14 October 2013. Archived from the original on 3 November 2013. Retrieved 3 November 2013.
- "LIMA 2019: Russia set to clear Sukhoi Su-57 for export". 28 March 2019. Archived from the original on 29 March 2019. Retrieved 14 April 2019.
- Karnozov, Vladimir. "Sukhoi T-50 Prototype Suffers Fire on Approach To Land". Aviation International News. Archived from the original on 31 January 2019. Retrieved 30 January 2019.
- "T-50 Fighter Jet Fire Near Moscow Not to Affect Test Run". RIA Novosti. Archived from the original on 12 June 2014. Retrieved 10 June 2014.
- Butowski 2012, p. 48-52.
- "Sukhoi T-50 Shows Flight-Control Innovations". Aviationweek.com. Archived from the original on 27 March 2014. Retrieved 14 November 2014.
- Butowski, Piotr. "Raptorski's Maiden Flight". Air International, Vol. 78, No 3, March 2010, pp. 30–37. Stamford, UK: Key Publishing.
- Butowski, Piotr. "Russian Raptor?". Combat Aircraft, January 2016, pp. 52–57. Stamford, UK: Key Publishing.
- Butowski, Piotr. "Putin's Raptorski". Air International, Vol. 93, No 3, September 2017, pp. 24–27. Stamford, UK: Key Publishing.
- "Су-35С или Су-57: что важнее для ВКС России? - Армейский вестник". Army-news.ru. Archived from the original on 19 November 2018. Retrieved 12 December 2018.
- "Закрытая тема. Что известно об "Изделии 30"?". topwar.ru. 18 March 2019. Retrieved 28 April 2019.
- "Sukhoi Su-57 Russia Fifth generation Stealth fighter jet". Fighter Jets World. 19 March 2018. Archived from the original on 31 January 2019. Retrieved 31 January 2019.
- "Sukhoi Su-57 (T-50 / PAK FA) 5th Generation Multi-Role Stealth Aircraft - Russia". militaryfactory.com. Archived from the original on 7 August 2018. Retrieved 31 January 2019.
- "Russian T-50 Fighter Ejection Seat, Survival Equipment Pass Test". defenseworld.net. Archived from the original on 31 January 2019. Retrieved 31 January 2019.
- "Су-57 вооружат сверхдальней гиперзвуковой ракетой Р-37М". Interfax.ru. 26 September 2018. Archived from the original on 18 December 2018. Retrieved 12 December 2018.
- "Какими ракетами Су-57 будет бить F-22". svpressa.ru. 16 August 2017. Archived from the original on 30 June 2018. Retrieved 12 December 2018.
- "Новые боеприпасы значительно расширят боевой потенциал Су-57". Российская газета. Archived from the original on 30 June 2018. Retrieved 12 December 2018.
- "Су-57 теперь летает с новейшим оружием". vesti.ru. Archived from the original on 30 June 2018. Retrieved 12 December 2018.
- "Истребитель Су-57 на испытаниях превзошел лучшие американские аналоги". Российская газета. Archived from the original on 29 December 2018. Retrieved 12 December 2018.
- "T-50 / Project 701 / PAK FA." Archived 27 January 2006 at the Wayback Machine GlobalSecurity.org. Retrieved: 26 January 2011.
- Butowski, Piotr. "Raptorski's Maiden Flight". Air International, Vol. 78, No 3, March 2010, pp. 30–37. Stamford, UK: Key Publishing.
- Butowski, Piotr. "T-50 Turning and Burning over Moscow". Air International, Vol. 85, No 4, October 2013, pp. 79–82. Stamford, UK: Key Publishing.
- Butowski, Piotr. "Is Russia's fifth-generation PAK FA fighter programme still on track?". Air International, June 2015, pp. 76–81. Stamford, UK: Key Publishing.
- Butowski, Piotr. "Russian Raptor?". Combat Aircraft, January 2016, pp. 52–57. Stamford, UK: Key Publishing.
- Lake, Jon. "Sukhoi T-50 - Russia's Raptor?" Combat Aircraft, Vol. 11, No.4, April 2010.
- Sweetman, Bill. "Sukhoi T-50 Shows Flight-Control Innovations". Aviation Week & Space Technology, 19 August 2013. New York City, New York, US: Penton Media, Inc.