First flown in 1997, the F-22 descended from the Lockheed YF-22 and was variously designated F-22 and F/A-22 before it formally entered service in December 2005 as the F-22A. Although the U.S. Air Force (USAF) had originally planned to buy a total of 750 ATFs to replace its F-15 Eagles, it later scaled down to 381, and the program was ultimately cut to 195 aircraft — 187 of them operational models — in 2009 due to political opposition from high costs, a lack of air-to-air missions at the time of production, and the development of the more affordable and versatile F-35.[N 2] The last aircraft was delivered in 2012.
The F-22 is a critical component of the USAF's current high-end tactical airpower. While it had a protracted development and initial operational difficulties, the aircraft became the service's leading platform for air-to-air missions against peer adversaries. Although designed for counter-air operations, the F-22 has also performed strike and electronic surveillance, including missions in the Middle East against the Islamic State and Assad-aligned forces. The F-22 is planned to remain a cornerstone of the USAF's fighter fleet until its succession by the crewed Next Generation Air Dominance fighter.
The F-22 originated from the Advanced Tactical Fighter (ATF) program that the U.S. Air Force (USAF) initiated in 1981 to replace the F-15 Eagle and F-16 Fighting Falcon. Intelligence reports indicated that their effectiveness would be eroded by emerging worldwide threats emanating from the Soviet Union, including new developments in surface-to-air missile systems for integrated air defense networks, the introduction of the Beriev A-50 "Mainstay" airborne warning and control system (AWACS), and the proliferation of the Sukhoi Su-27 "Flanker" and Mikoyan MiG-29 "Fulcrum" class of fighter aircraft.[3] Code-named "Senior Sky", the ATF would become an air superiority fighter program influenced by these reports; in the potential scenario of a Soviet and Warsaw Pact invasion in Central Europe, the ATF was envisaged to support the air-land battle by spearheading offensive and defensive counter-air operations (OCA/DCA) in this highly contested environment that would then enable following echelons of NATO strike and attack aircraft to perform air interdiction against ground formations; to do so, the ATF would make an ambitious leap in capability and survivability by taking advantage of the new technologies in fighter design on the horizon, including composite materials, lightweight alloys, advanced flight control systems and avionics, more powerful propulsion systems for supersonic cruise (or supercruise) around Mach 1.5, and stealth technology for low observability.[4][5][6]
The USAF initiated an ATF request for information (RFI) to the aerospace industry in May 1981, and following a period of concept and specification development, the ATF System Program Office (SPO) issued the demonstration and validation (Dem/Val) request for proposals (RFP) in September 1985, with requirements placing strong emphasis on stealth, supersonic cruise and maneuver. The RFP saw some alterations after its initial release, including more stringent signature reduction requirements in December 1985 and adding the requirement for flying technology demonstrator prototypes in May 1986.[N 3][8] Owing to the immense investments required to develop the advanced technologies, teaming between companies was encouraged. Of the seven bidding companies,[N 4]Lockheed and Northrop were selected on 31 October 1986.[N 5] Lockheed, through its Skunk Works division at Burbank, California, teamed with Boeing and General Dynamics while Northrop teamed with McDonnell Douglas. These two contractor teams undertook a 50-month Dem/Val phase, culminating in the flight test of two technology demonstrator prototypes, the Lockheed YF-22 and Northrop YF-23; while they represented competing designs, the prototypes were meant for demonstrating concept viability and risk mitigation rather than a competitive flyoff.[N 6] Concurrently, Pratt & Whitney and General Electric competed for the ATF engines.[12][13]
Evolution of the F-22 design from 1987, with the bottom being the production configuration
Dem/Val was focused on system engineering, technology development plans, and risk reduction over point aircraft designs; in fact, after down-select, the Lockheed team completely redesigned the airframe in the summer of 1987 due to weight analysis, with notable changes including the wing planform from swept trapezoidal to diamond-like delta and a reduction in forebody planform area.[14][15] The team extensively used analytical and empirical methods including computational fluid dynamics and computer-aided design software, wind tunnel testing (18,000 hours for Dem/Val), and radar cross-section (RCS) calculations and pole testing. Avionics systems were tested in ground and flying laboratories.[16] During Dem/Val, the SPO used trade studies from both teams to review ATF requirements and adjust ones that were significant weight and cost drivers while having marginal value. The short takeoff and landing (STOL) requirement was relaxed to delete thrust-reversers, saving substantial weight. Side looking radars and the dedicated infrared search and track (IRST) system were eventually removed as well, although space and cooling provisions were retained to allow for their later addition. The ejection seat was downgraded from a fresh design to the existing ACES II. Despite efforts by the contractor teams to rein in weight, the takeoff gross weight estimates grew from 50,000 to 60,000lb (22,700 to 27,200kg), resulting in engine thrust requirement increasing from 30,000 to 35,000lbf (133 to 156kN) class.[17]
Each team built two prototype air vehicles for Dem/Val, one for each of the two engine options. The YF-22 had its maiden flight on 29 September 1990 and in testing successfully demonstrated supercruise, high angle-of-attack maneuvers, and the firing of air-to-air missiles from internal weapons bays. After the flight test of the demonstrator prototypes at Edwards Air Force Base, the teams submitted the results and their design proposals — or Preferred System Concept — for full-scale development in December 1990; on 23 April 1991, Secretary of the USAFDonald Rice announced the Lockheed team and Pratt & Whitney as the winners of the ATF and engine competitions.[18] Both designs met or exceeded all performance requirements; the YF-23 was considered stealthier and faster, but the YF-22, with its thrust vectoring nozzles, was more maneuverable as well as less expensive and risky, having flown considerably more test sorties and hours than its counterpart.[19][20] The press also speculated that the Lockheed team's design was more adaptable to the Navy Advanced Tactical Fighter (NATF) for replacing the F-14 Tomcat, but by fiscal year (FY) 1992, the U.S. Navy had abandoned NATF due to cost.[21]
Full-scale development
As the program moved to full-scale development, or Engineering & Manufacturing Development (EMD), the production F-22 design (internally designated as Configuration 645) evolved to have notable differences from the immature YF-22 demonstrator, despite having similar configuration.[N 7] The external geometry saw significant alterations; the wing's leading edge sweep angle was decreased from 48° to 42°, while the vertical stabilizers were shifted rearward and decreased in area by 20%.[23] The radome shape was changed for better radar performance, the wingtips were clipped for antennas, and the dedicated airbrake was eliminated. To improve pilot visibility and aerodynamics, the canopy was moved forward 7 inches (18cm) and the engine inlets moved rearward 14 inches (36cm). The shapes of the fuselage, wing, and stabilator trailing edges were refined to improve aerodynamics, strength, and stealth characteristics. The internal structural design was refined and reinforced, with the production airframe designed for a service life of 8,000 hours.[22][24] The revised shaping was validated with over 17,000 additional hours of wind tunnel testing and further RCS testing at Helendale, California and the USAF RATSCAT range before first flight. Increasing weight during EMD due to demanding ballistic survivability requirements and added capabilities caused slight reductions in projected range and maneuver performance.[25]
An EMD F-22 alongside the Flying Test Bed
Aside from advances in air vehicle and propulsion technology, the F-22's avionics were unprecedented in complexity and scale for a combat aircraft, with the fusion of multiple sensors systems and antennas, including electronic warfare, communication/navigation/identification (CNI), and software integration of 1.7million lines of code written in Ada; the avionics often became the pacing factor of the whole program. In light of rapidly advancing computing and semiconductor technology, the avionics was to employ the Department of Defense's (DoD) PAVE PILLAR systems architecture and Very High Speed Integrated Circuit (VHSIC) program technology; the avionics had computing and processing requirements equivalent to multiple contemporary Cray supercomputers in order to achieve sensor fusion.[26][27] To enable early looks and troubleshooting for mission software development, the software was ground-tested in Boeing's Avionics Integration Laboratory (AIL) and flight-tested on a Boeing 757 modified with F-22 mission systems, called Flying Test Bed.[28][29] Because much of the F-22's avionics design occurred in the 1990s as the electronics industry was shifting from military to commercial applications as the predominant market, avionics upgrade efforts was initially difficult and protracted due to changing industry standards; for instance, C/C++ rather than Ada became predominant programming languages.[30]
Manufacturers of the F-22
The roughly equal division of work amongst the team largely carried through from Dem/Val to EMD, with prime contractor Lockheed responsible for the forward fuselage and control surfaces, General Dynamics for the center fuselage, and Boeing for aft fuselage and wings. Lockheed acquired General Dynamics' fighter portfolio at Fort Worth, Texas in 1993 and thus had the majority of the airframe manufacturing, and merged with Martin Marietta in 1995 to form Lockheed Martin. While Lockheed primarily performed Dem/Val work at its Skunk Works sites in Burbank and Palmdale, California, it shifted its program office and EMD work from Burbank to Marietta, Georgia, where it performed final assembly; Boeing manufactured airframe components, performed avionics integration and developed the training systems in Seattle, Washington. The EMD contract originally ordered seven single-seat F-22As and two twin-seat F-22Bs, although the latter was canceled in 1996 to reduce development costs and the orders were converted to single seaters.[31] The first F-22A, an EMD aircraft with tail number 4001, was unveiled at Air Force Plant 6 in Dobbins Air Reserve Base in Marietta on 9 April 1997 where it was officially named "Raptor".[N 8] The aircraft first flew on 7 September 1997, piloted by chief test pilot Alfred "Paul" Metz.[N 9][33][34] The Raptor's designation was briefly changed to F/A-22 starting in September 2002, mimicking the Navy's F/A-18 Hornet and intended to highlight a planned ground-attack capability amid debate over the aircraft's role and relevance. The F-22 designation was reinstated in December 2005, when the aircraft entered service.[35][36]
An EMD F-22 refuels from a KC-135 during testing; the attachment on the back top is for a spin recovery chute
The F-22 flight test program consisted of flight sciences, developmental test (DT), and initial operational test and evaluation (IOT&E) by the 411th Flight Test Squadron (FLTS) at Edwards AFB, California, as well as follow-on OT&E and development of tactics and operational employment by the 422nd Test and Evaluation Squadron (TES) at Nellis AFB, Nevada. Nine EMD jets assigned to the 411th FLTS would participate in the test program under the Combined Test Force (CTF) at Edwards. The first two aircraft conducted envelope expansion testing such as flying qualities, air vehicle performance, propulsion, and stores separation. The third aircraft, the first to have production-level internal structure, tested flight loads, flutter, and stores separation, while two non-flying F-22s were built for testing static loads and fatigue. Subsequent EMD aircraft and the Boeing 757 FTB tested avionics, environmental qualifications, and observables, with the first combat-capable Block 3.0 software flying in 2001.[37] Air vehicle testing resulted in several structural design modifications and retrofits for earlier lots, including tail fin strengthening to resolve buffeting in certain conditions.[38] Raptor 4001 was retired from flight testing in 2000 and subsequently sent to Wright-Patterson AFB for survivability testing, including live fire testing and battle damage repair training.[39] Other retired EMD F-22s have been used as maintenance trainers.[40]
An EMD F-22 of the 411th FLTS flies over Edwards AFB, California, in 2018
Because the F-22 had been designed to defeat contemporary and projected Soviet fighters, the end of the Cold War and the dissolution of the Soviet Union in 1991 had major impacts on program funding; the DoD reduced its urgency for new weapon systems and the following years would see successive reductions in its budget. This resulted in the F-22's EMD being rescheduled and lengthened multiple times. Furthermore, the aircraft's sophistication and numerous technological innovations required extensive testing, which exacerbated the cost overruns and delays, particularly from the mission avionics. Some capabilities were also deferred to post-service upgrades, reducing the initial cost but increasing total program cost.[41][42] The program transitioned to full-rate production in March 2005 and completed EMD that December, after which the test force had flown 3,496 sorties for over 7,600 flight hours.[39] As the F-22 was designed for upgrades throughout its lifecycle, the 411th FLTS and 422nd TES continued the DT/OT&E and tactics development of these upgrades.[40] Derivatives such as the X-44 thrust vectoring research aircraft and the FB-22 medium-range regional bomber were proposed in the late 1990s and early 2000s, although these were eventually abandoned. In 2006, the F-22 development team won the Collier Trophy, American aviation's most prestigious award.[43] Due to the aircraft's sophisticated capabilities, contractors have been targeted by cyberattacks and technology theft.[44]
Production and procurement
The USAF originally envisioned ordering 750 ATFs at a total program cost of $44.3billion and procurement cost of $26.2billion in FY 1985 dollars, with production beginning in 1994 and service entry in the mid-to-late 1990s. The 1990 Major Aircraft Review (MAR) led by Secretary of DefenseDick Cheney reduced this to 648 aircraft beginning in 1996 and service entry in the early-to-mid 2000s. After the end of the Cold War, this was further curtailed to 442 in the 1993 Bottom-Up Review while the USAF eventually set its requirement to 381 to support its Air Expeditionary Force structure with the last deliveries in 2013. Throughout development and production, the program was continually scrutinized for its costs and less expensive alternatives such as modernized F-15 or F-16 variants were being proposed, even though the USAF considered the F-22 to provide the greatest capability increase against peer adversaries for the investment.[45] However, funding instability had reduced the total to 339 by 1997 and production was nearly halted by Congress in 1999.[N 10] Although funds were eventually restored, the planned number continued to decline due to delays and cost overruns during EMD, slipping to 277 by 2003.[47][48] In 2004, with its focus on asymmetric counterinsurgency warfare in Iraq and Afghanistan, the DoD under Secretary Donald Rumsfeld further cut the planned F-22 procurement to 183 production aircraft, despite the USAF's requirement for 381;[49][50] funding for this number was reached by a multi-year procurement contract awarded in 2006, with aircraft distributed to seven combat squadrons; total program cost was projected to be $62billion (~$90.2billion in 2023).[51] In 2008, Congress passed a defense spending bill that raised the total orders for production aircraft to 187.[52][53]
F-22 production would support over 1,000 subcontractors and suppliers from 46 states and up to 95,000 jobs, and spanned 15 years at a peak rate of roughly two airplanes per month, about half of the initially planned rate from the 1990 MAR; after EMD aircraft contracts, the first production lot was awarded in September 2000.[54][55][56] As production wound down in 2011, the total program cost was estimated to be about $67.3billion (about $360million for each production aircraft delivered), with $32.4billion spent on Research, Development, Test, and Evaluation (RDT&E) and $34.9billion on procurement and military construction in then year dollars. The incremental cost for an additional F-22 was estimated at $138million (~$191million in 2023) in 2009.[57][58]
In total, 195 F-22s were built. The first two were EMD aircraft in the Block 1.0[N 11] configuration for initial flight testing and envelope expansion, while the third was a Block 2.0 aircraft built to represent the internal structure of production airframes and enabled it to test full flight loads. Six more EMD aircraft were built in the Block 10 configuration for development and upgrade testing, with the last two considered essentially production-quality jets. Production for operational squadrons consisted of 74 Block 10/20 training aircraft and 112 Block 30/35 combat aircraft for a total of 186 (or 187 when accounting for Production Representative Test Vehicles and certain EMD jets);[N 1] one of the Block 30 aircraft is dedicated to flight sciences at Edwards AFB.[59][60] By 2020, Block 20 aircraft from Lot 3 onward were upgraded to Block 30 standards under the Common Configuration Plan, increasing the Block 30/35 fleet to 149 aircraft while 37 remained in the Block 20 configuration for training.[N 12][62][63]
Ban on exports
Two F-22s during flight testing, the upper one being the first EMD F-22, Raptor 4001
In order to prevent the inadvertent disclosure of the aircraft's stealth technology and classified capabilities to the U.S.'s adversaries,[64][65] annual DoD appropriations acts since FY1998 have included a provision prohibiting the use of funds made available in each act to approve or license the sale of the F-22 to any foreign government.[66] Customers for U.S. fighters are acquiring earlier designs such as the F-15 Eagle and F-16 Fighting Falcon or the newer F-35 Lightning II, which contains technology from the F-22 but was designed to be cheaper, more flexible, and available for export.[67] In September 2006, Congress upheld the ban on foreign F-22 sales.[68] Despite the ban, the 2010 defense authorization bill included provisions requiring the DoD to report on the costs and feasibility for an F-22 export variant, and another report on the effect of export sales on the U.S. aerospace industry.[69][70]
Some Australian defense officials and politicians have expressed interest in procuring the F-22; in 2008, the Chief of the Defence Force, Air Chief MarshalAngus Houston, stated that the aircraft was being considered by the Royal Australian Air Force (RAAF) as a potential supplement to the F-35.[71][72] Some defense commentators have even advocated for the purchase in lieu of the planned F-35s, citing the F-22's known capabilities and F-35's delays and developmental uncertainties.[73][74][75] However, considerations for the F-22 were later dropped and the F/A-18E/F Super Hornet would serve as the RAAF's interim aircraft prior to the F-35's service entry.[76]
The Japanese government also showed interest in the F-22. The Japan Air Self-Defense Force (JASDF) would reportedly require fewer fighters for its mission if it obtained the F-22, thus reducing engineering and staffing costs.[77][78] With the end of F-22 production, Japan chose the F-35 in December 2011.[79] At one point the Israeli Air Force had hoped to purchase up to 50 F-22s. In November 2003, however, Israeli representatives announced that after years of analysis and discussions with Lockheed Martin and the DoD, they had concluded that Israel could not afford the aircraft.[80] Israel eventually purchased the F-35.[81][82]
Production termination
Throughout the 2000s when the U.S. was primarily fighting counterinsurgency wars in Iraq and Afghanistan, the USAF's requirement for 381 F-22s was questioned over rising costs, initial reliability and availability problems, limited multirole versatility, and a lack of relevant adversaries for air combat missions.[67][83] In 2006, Comptroller General of the United StatesDavid Walker found that "the DoD has not demonstrated the need" for more investment in the F-22,[84] and further opposition was expressed by Bush Administration Secretary of Defense Rumsfeld and his successor Robert Gates, Deputy Secretary of Defense Gordon R. England, and Chairman of U.S. Senate Armed Services Committee (SASC) Senators John Warner and John McCain.[85][86] Under Rumsfeld, procurement was severely cut to 183 aircraft. The F-22 lost influential supporters in 2008 after the forced resignations of Secretary of the Air Force Michael Wynne and the Chief of Staff of the Air Force General T. Michael Moseley.[87] In November 2008, Gates stated that the F-22 lacked relevance in asymmetric post-Cold War conflicts,[88] and in April 2009, under the Obama Administration, he called for production to end in FY 2011 after completing 187 F-22s.[89]
Two F-22As in close trail formation
The loss of staunch F-22 advocates in the upper DoD echelons resulted in the erosion of its political support. In July 2008, General James Cartwright, Vice Chairman of the Joint Chiefs of Staff, stated to the SASC his reasons for supporting the termination of F-22 production, including shifting resources to the multi-service F-35 and the electric warfare EA-18G Growler.[90] Although Russian and Chinese fighter developments fueled concern for the USAF, Gates dismissed this and in 2010, he set the F-22 requirement to 187 aircraft by lowering the number of major regional conflict preparations from two to one, despite an effort by Wynne's and Moseley's successors Michael Donley and General Norton Schwartz to raise the number to 243; according to Schwartz, he and Donley finally relented in order to convince Gates to preserve the Long Range Strike Bomber program.[91][92] After President Barack Obama threatened to veto further production at Gates' urging, both the Senate and House agreed to abide by the 187 cap in July 2009.[93][94] Gates highlighted the F-35's role in the decision,[95] and believed that the U.S. would maintain its stealth fighter numbers advantage by 2025 even with F-35 delays.[96] In December 2011, the 195th and final F-22 was completed out of 8 test and 187 production aircraft built; the jet was delivered on 2 May 2012.[97][98]
After production ended, F-22 tooling and associated documentation were retained and mothballed at the Sierra Army Depot to support repairs and maintenance throughout the fleet life cycle, as well as the possibility of a production restart or a Service Life Extension Program (SLEP).[99][100][101] The Marietta plant space was repurposed to support the C-130J and F-35, while engineering work for sustainment and upgrades continued at Fort Worth, Texas and Palmdale, California.[102][103] The curtailed production forced the USAF to extend the service of 179 F-15C/Ds until 2026—well beyond its planned retirement—and replace those with new-build F-15EX, which took advantage of an active production line for export customers to minimize non-recurring start-up costs, in order to retain adequate numbers of air superiority fighters.[104][105]
In April 2016, Congress directed the USAF to conduct a cost study and assessment associated with resuming production of the F-22, citing advancing threats from Russia and China.[106] On 9 June 2017, the USAF submitted their report stating they had no plans to restart the F-22 production line due to cost-prohibitive economic and logistical challenges; it estimated it would cost approximately $50billion to procure 194 additional F-22s at a cost of $206–216million per aircraft, including approximately $9.9billion for non-recurring start-up costs and $40.4billion for acquisition with the first delivery in the mid-to-late 2020s. The long gap since the end of production meant hiring new workers, sourcing replacement vendors, and finding new plant space, contributing to the high start-up costs and lead times. The USAF believed that the funding would be better invested in its next-generation Air Superiority 2030 effort, which evolved into the Next Generation Air Dominance.[107][103]
Modernization and upgrades
The F-22 and its subsystems were designed to be upgraded over its life cycle in anticipation for technological advances and evolving threats, although this initially proved difficult and costly due to the highly integrated avionics systems architecture. The modernization and upgrades consist of software and hardware modifications captured under numbered Increments, originally called Spirals, as well as software-only Operational Flight Program (OFP) Updates.[108] Amid debates over the airplane's relevance in asymmetric counterinsurgency warfare, the first Increments and OFP Updates primarily focused on ground attack, or strike capabilities. Increment 2, the first upgrade program, was implemented in 2005 for Block 20 aircraft onward and enabled the employment of Joint Direct Attack Munitions (JDAM). The improved AN/APG-77(V)1 radar, which incorporates air-to-ground modes, was certified in March 2007 and fitted on airframes from Lot 5 onward.[109] Increment 3.1 and Updates 3 and 4 for Block 30/35 aircraft improved ground-attack capabilities through synthetic aperture radar (SAR) mapping and radio emitter direction finding, electronic attack and Small Diameter Bomb (SDB) integration; testing began in 2009 and the first upgraded aircraft was delivered in 2011.[110][111] To address oxygen deprivation issues, F-22s were fitted with an automatic backup oxygen system (ABOS) and modified life support system starting in 2012.[112]
In contrast to prior upgrades, Increment 3.2 for Block 30/35 aircraft emphasized air combat capabilities and was a two-part process. 3.2A focused on electronic warfare, CNI including Link 16 receive-only capability, and interim AIM-9X and AIM-120D capability while 3.2B included geolocation improvements and full AIM-9X/AIM-120D integration; fleet releases began in 2013 and 2019, respectively. Concurrent with 3.2, Updates 5 and 6 added Automatic Ground Collision Avoidance System, cryptographic enhancements, and improved avionics stability, among others.[113][114] A MIDS-JTRS terminal, which includes Mode 5 IFF and Link 16 transmit/receive capability, was installed starting in 2021.[115][30] To address obsolescence and modernization difficulties, the F-22's mission computers were upgraded in 2021 after 3.2 with military-hardened commercial off-the-shelf (COTS) open mission system (OMS) processor modules with a modular open systems architecture (MOSA). Agile software development process in conjunction with an orchestration system was implemented to enable faster upgrades from additional vendors, and software updates shifted away from Increments developed using the waterfall model to numbered releases rolled out on an annual basis.[116][117]
Additional upgrades currently being tested include new sensors and antennas, integration of new weapons including the AIM-260 JATM, and reliability improvements such as more durable stealth coatings; the dedicated infrared search and track (IRST), originally deleted during Dem/Val, is one of the sensors added.[118][119] Other developments include all-aspect IRST functionality for the Missile Launch Detector (MLD), manned-unmanned teaming (MUM-T) capability with uncrewed collaborative combat aircraft (CCA) or "loyal wingmen", and cockpit improvements.[30][120][121] To preserve the aircraft's stealth while enabling additional payload and fuel capacity, stealthy external carriage has been investigated since the early-2000s, with a low drag, low-observable external tank and pylon currently under development to increase stealthy combat radius.[122] The F-22 has also been used to test technology for its eventual successor from the Next Generation Air Dominance (NGAD) program; some advances are to be applied to the F-22 as well.[123]
Not all proposed upgrades have been implemented. The planned Multifunction Advanced Data Link (MADL) integration was cut due to development delays and lack of proliferation. Although the Gentex/Raytheon (now Thales USA) Scorpion helmet-mounted cuing system (HMCS) was successfully tested on the F-22 in 2013, funding cuts prevented its deployment.[124] While Block 20 aircraft from Lot 3 onwards have been upgraded to Block 30/35 under the Common Configuration Plan, Lockheed Martin in 2017 had also proposed upgrading all remaining Block 20 training aircraft to Block 30/35 as well to increase numbers available for combat; this was not pursued due to other budget priorities.[63]
Aside from modernizations, the F-22's structural design and construction was improved over the course of the production run; for instance, aircraft from Lot 3 onwards had improved stabilators built by Vought.[125][126] The fleet underwent a $350million "structures retrofit program" to resolve problems identified during testing as well as address improper titanium heat treatment in the parts of early batches.[127][38] By January 2021, all aircraft had gone through the Structural Repair Program to ensure full service lives for the entire fleet.[128][129] The F-22 has also been used to test and qualify alternative fuels, including a synthetic jet fuel consisting of 50/50 mix of JP-8 and a Fischer–Tropsch process-produced, natural gas-based fuel in August 2008, and a 50% mixture of biofuel derived from camelina in March 2011.[130][131]
Design
Overview
F-22 flight demonstration video
The F-22 Raptor (internally designated Configuration 645) is a fifth-generation air superiority fighter that is considered fourth generation in stealth aircraft technology by the USAF.[132] It is the first operational aircraft to combine supercruise, supermaneuverability, stealth, and integrated avionics (or sensor fusion) in a single weapons platform to enable it to survive and conduct missions, primarily offensive and defensive counter-air operations, in highly contested environments.[35]
The F-22's shape combines stealth and aerodynamic performance. Planform and panel edges are aligned at common angular aspects and surfaces, also aligned accordingly, have continuous curvature to minimize the aircraft's radar cross-section.[133] Its clipped diamond-like delta wings have the leading edge swept back 42°, trailing edge swept forward 17°, a slight anhedral and a conical camber to reduce supersonic drag. The wings are smoothly blended into the fuselage with four empennage surfaces and leading edge root extensions running to the caret inlets' upper edges, where the forebody chines also meet. Flight control surfaces include leading-edge flaps, flaperons, ailerons, rudders on the canted vertical stabilizers, and all-moving horizontal tails (stabilators); for speed brake function, the ailerons deflect up, flaperons down, and rudders outwards to increase drag.[134][28] Owing to the focus on supersonic performance, area rule is applied extensively to the airplane's shape and nearly all of the fuselage volume lies ahead of the wing's trailing edge to reduce drag at supersonic speeds, with the stabilators pivoting from tail booms extending aft of the engine nozzles.[135] Weapons are carried internally in the fuselage for stealth. The aircraft has a refueling boom receptacle centered on its spine and retractable tricycle landing gear as well as an emergency tailhook.[28] Fire suppression system and fuel tank inerting system are installed for survivability.[136][137]
The aircraft's dual Pratt & Whitney F119 augmented turbofan engines are closely spaced and incorporate rectangular two-dimensional thrust vectoring nozzles with a range of ±20 degrees in the pitch-axis; the nozzles are fully integrated into the F-22's flight controls and vehicle management system. Each engine has dual-redundant Hamilton Standard full-authority digital engine control (FADEC) and maximum thrust in the 35,000lbf (156kN) class. The F-22's thrust-to-weight ratio at typical combat weight is nearly at unity in maximum military power and 1.25 in full afterburner. The fixed shoulder-mounted caret inlets are offset from the forward fuselage to divert the turbulent boundary layer and generate oblique shocks with the upper inboard corners to ensure good total pressure recovery and efficient supersonic flow compression.[138] Maximum speed without external stores is approximately Mach 1.8 in supercruise at military/intermediate power and greater than Mach 2 with afterburners.[N 13] With 18,000lb (8,165kg) of internal fuel and an additional 8,000lb (3,629kg) in two 600-gallon external tanks, the jet has a ferry range of over 1,600nmi (1,840mi; 2,960km).[141]
F-22 flying with its Pratt & Whitney F119 engines on full afterburner during testing
The F-22's high cruise speed and operating altitude over prior fighters improve the effectiveness of its sensors and weapon systems, and increase survivability against ground defenses such as surface-to-air missiles.[142][143] Its ability to supercruise, or sustain supersonic flight without using afterburners, allows it to intercept targets that afterburner-dependent aircraft would lack the fuel to reach. The use of internal weapons bays permits the aircraft to maintain comparatively higher performance over most other combat-configured fighters due to a lack of parasitic drag from external stores.[144] The F-22's thrust and aerodynamics enable regular combat speeds of Mach 1.5 at 50,000 feet (15,000m), thus providing 50% greater employment range for air-to-air missiles and twice the effective range for JDAMs than with prior platforms.[N 14][146][147] Its structure contains a significant amount of high-strength materials to withstand stress and heat of sustained supersonic flight. Respectively, titanium alloys and bismaleimide/epoxy composites comprise 42% and 24% of the structural weight; the materials and multiple load path structural design also enable good ballistic survivability.[N 15][148][149]
The airplane's aerodynamics, relaxed stability, and powerful thrust-vectoring engines give it excellent maneuverability and energy potential across its flight envelope, capable of 9-g maneuvers at takeoff gross weight with full internal fuel.[140] Its large control surfaces, vortex-generating chines and LERX, and vectoring nozzles provide excellent high alpha (angle of attack) characteristics, and is capable of flying at trimmed alpha of over 60° while maintaining roll control and performing maneuvers such as the Herbst maneuver (J-turn) and Pugachev's Cobra;[150] vortex impingement on the vertical tail fins did cause more buffeting than initially anticipated, resulting in the strengthening of the fin structure by changing the rear spar from composite to titanium.[151][152] The computerized triplex-redundant fly-by-wirecontrol system and FADEC make the aircraft highly departure resistant and controllable, thus giving the pilot carefree handling.[153][144]
Stealth
For stealth, the F-22 carries weapons in internal bays. The doors for the center and side bays are open; the six LAU-142/A AMRAAM Vertical Eject Launchers (AVEL) are visible.
The F-22 was designed to be highly difficult to detect and track by radar, with radio waves reflected, scattered, or diffracted away from the emitter source towards specific sectors, or absorbed and attenuated. Measures to reduce RCS include airframe shaping such as alignment of edges and continuous curvature of surfaces, internal carriage of weapons, fixed-geometry serpentine inlets and curved vanes that prevent line-of-sight of the engine fan faces and turbines from any exterior view, use of radar-absorbent material (RAM), and attention to detail such as hinges and pilot helmets that could provide a radar return.[133] The F-22 was also designed to have decreased radio frequency emissions, infrared signature and acoustic signature as well as reduced visibility to the naked eye.[154] The aircraft's rectangular thrust-vectoring nozzles flatten the exhaust plume and facilitate its mixing with ambient air through shed vortices, which reduces infrared emissions to mitigate the threat of infrared homing ("heat seeking") surface-to-air or air-to-air missiles.[155][156] Additional measures to reduce the infrared signature include special topcoat and active cooling to manage the heat buildup from supersonic flight.[157][133]
Compared to previous stealth designs, the F-22 is less reliant on RAM, which are maintenance-intensive and susceptible to adverse weather conditions, and can undergo repairs on the flight line or in a normal hangar without climate control. The F-22 incorporates a Signature Assessment System which delivers warnings when the radar signature is degraded and necessitates repair.[150] While the F-22's exact RCS is classified, in 2009 Lockheed Martin released information indicating that from certain angles the airplane has an RCS of 0.0001 m2 or −40 dBsm – equivalent to the radar reflection of a "steel marble"; the aircraft can mount a Luneburg lens reflector to mask its RCS.[158][159] For missions where stealth is required, the mission capable rate is 62–70%.[N 16] Beginning in 2021, the F-22 has been seen testing a new chrome-like surface coating, speculated to help reduce the F-22's detectability by infrared tracking systems.[161][162]
Front fuselage detail of an F-22
The effectiveness of the stealth characteristics is difficult to gauge. The RCS value is a restrictive measurement of the aircraft's frontal or side area from the perspective of a static radar. When an aircraft maneuvers it exposes a completely different set of angles and surface area, potentially increasing radar observability. Furthermore, the F-22's stealth contouring and radar-absorbent materials are chiefly effective against high-frequency radars, usually found on other aircraft. The effects of Rayleigh scattering and resonance mean that low-frequency radars such as weather radars and early-warning radars are more likely to detect the F-22 due to its physical size. These are also conspicuous, susceptible to clutter, and have low precision.[163] Additionally, while faint or fleeting radar contacts make defenders aware that a stealth aircraft is present, reliably vectoring interception to attack the aircraft is much more challenging.[164][165]
The APG-77 radar has a low-observable, active-aperture, electronically scanned antenna with multiple target track-while-scan in all weather conditions; the antenna is tilted back for stealth. Its emissions can be focused to overload enemy sensors as an electronic attack capability. The radar changes frequencies more than 1,000 times per second to lower interception probability and has an estimated range of 125–150mi (201–241km) against an 11sqft (1m2) target and 250mi (400km) or more in narrow beams. The upgraded APG-77(V)1 provides air-to-ground functionality through synthetic aperture radar (SAR) mapping, ground moving target indication/track (GMTI/GMTT), and strike modes.[109][150] The ALR-94 electronic warfare system, among the most technically complex equipment on the F-22, integrates more than 30 antennas blended into the wings and fuselage for all-round radar warning receiver (RWR) coverage and threat geolocation. It can be used as a passive detector capable of searching targets at ranges (250+ nmi) exceeding the radar's, and can provide enough information for a target lock and cue radar emissions to a narrow beam (down to 2° by 2° in azimuth and elevation). Depending on the detected threat, the defensive systems can prompt the pilot to release countermeasures such as flares or chaff. The MLD uses six sensors to provide full spherical infrared coverage while the advanced IRST, housed in a stealthy wing pod, is a narrow field-of-view sensor for long-range passive identification and targeting.[168] To ensure stealth in the radio frequency spectrum, CNI emissions are strictly controlled and confined to specific sectors, with tactical communication between F-22s performed using the directional Inter/Intra-Flight Data Link (IFDL); the integrated CNI system, which incorporates a MIDS-JTRS terminal, also manages TACAN, IFF (including Mode 5), and communication through various methods such as HAVE QUICK/SATURN and SINCGARS.[169][170] The aircraft was also upgraded with an automatic ground collision avoidance system (GCAS).[171]
A CIP unit for the F-22
Information from radar, CNI, and other sensors are processed by two Hughes Common Integrated Processor (CIP) mission computers, each capable of processing up to 10.5billion instructions per second.[172][173] The F-22's baseline software has some 1.7million lines of code, the majority involving the mission systems such as processing radar data.[174] The highly integrated nature of the avionics architecture system, as well as the use of the programming language Ada,[N 17] has made the development and testing of upgrades challenging. To enable more rapid upgrades, the CIPs were upgraded with Curtiss-Wright open mission systems (OMS) processor modules as well as a modular open systems architecture called the Open Systems Enclave (OSE) orchestration platform to allow the avionics suite to interface with containerized software from third-party vendors.[30][176]
The F-22's ability to operate close to the battlefield gives the aircraft threat detection and identification capability comparative with the RC-135 Rivet Joint, and the ability to function as a "mini-AWACS", though its radar is less powerful than those of dedicated platforms. This allows the F-22 to rapidly designate targets for allies and coordinate friendly aircraft.[150][177] Although communication with other aircraft types was initially limited to voice, upgrades have enabled data to be transferred through a Battlefield Airborne Communications Node (BACN) or via JTIDS/Link 16 traffic through MIDS-JTRS.[115] The IEEE 1394B bus developed for the F-22 was derived from the commercial IEEE 1394 "FireWire" bus system.[178] In 2007, the F-22's radar was tested as a wireless data transceiver, transmitting data at 548 megabits per second and receiving at gigabit speed, far faster than the Link 16 system.[179] The radio frequency receivers of the electronic support measures (ESM) system give the aircraft the ability to perform intelligence, surveillance, and reconnaissance (ISR) tasks.[180][181]
Cockpit
Cockpit of the F-22, showing instruments, head-up display and throttle top (lower left)
The F-22 has a glass cockpit with all-digital flight instruments. The monochrome head-up display offers a wide field of view and serves as a primary flight instrument; information is also displayed upon six color liquid-crystal display (LCD) panels.[182] The primary flight controls are a force-sensitive side-stick controller and a pair of throttles. The USAF initially wanted to implement direct voice input (DVI) controls, but this was judged to be too technically risky and was abandoned.[183] The canopy's dimensions are approximately 140inches long, 45inches wide, and 27inches tall (355cm × 115cm × 69cm) and weighs 360 pounds.[184] The canopy was redesigned after the original design lasted an average of 331 hours instead of the required 800 hours.[83]
The F-22 has integrated radio functionality, the signal processing systems are virtualized rather than as a separate hardware module.[185] The integrated control panel (ICP) is a keypad system for entering communications, navigation, and autopilot data. Two 3in ×4in (7.6cm ×10.2cm) up-front displays located around the ICP are used to display integrated caution advisory/warning (ICAW) data, CNI data and also serve as the stand-by flight instrumentation group and fuel quantity indicator for redundancy.[186] The stand-by flight group displays an artificial horizon, for basic instrument meteorological conditions. The 8in ×8in (20cm ×20cm)primary multi-function display (PMFD) is located under the ICP, and is used for navigation and situation assessment. Three 6.25in ×6.25in (15.9cm ×15.9cm) secondary multi-function displays are located around the PMFD for tactical information and stores management.[187]
The ejection seat is a version of the ACES II commonly used in USAF aircraft, with a center-mounted ejection control.[188] The F-22 has a complex life support system, which includes the onboard oxygen generation system (OBOGS), protective pilot garments, and a breathing regulator/anti-g (BRAG) valve controlling flow and pressure to the pilot's mask and garments. The pilot garments were developed under the Advanced Technology Anti-G Suit (ATAGS) project and protect against chemical/biological hazards and cold-water immersion, counter g-forces and low pressure at high altitudes, and provide thermal relief.[189] Following a series of hypoxia-related issues, the life support system was consequently revised to include an automatic backup oxygen system and a new flight vest valve.[112] In combat environments, the ejection seat includes a modified M4 carbine designated the GAU-5/A.[190]
The F-22 has three internal weapons bays: a large main bay on the bottom of the fuselage, and two smaller bays on the sides of the fuselage, aft of the engine inlets; a small bay for countermeasures such as flares is located behind each side bay.[191] The main bay is split along the centerline and can accommodate six LAU-142/A launchers for beyond-visual-range (BVR) missiles and each side bay has an LAU-141/A launcher for short-range missiles. The primary air-to-air missiles are the AIM-120 AMRAAM and the AIM-9 Sidewinder, with planned integration of the AIM-260 JATM.[192] Missile launches require the bay doors to be open for less than a second, during which pneumatic or hydraulic arms push missiles clear of the aircraft; this is to reduce vulnerability to detection and to deploy missiles during high-speed flight.[193] An internally mounted M61A2 Vulcan 20mm rotary cannon is embedded in the airplane's right wing root with the muzzle covered by a retractable door.[194] The radar projection of the cannon fire's path is displayed on the pilot's head-up display.[195]
Although designed for air-to-air missiles, the main bay can replace four launchers with two bomb racks that can each carry one 1,000lb (450kg) or four 250lb (110kg) bombs for a total of 2,000 pounds (910kg) of air-to-surface ordnance.[196][35] In 2024, Lockheed Martin disclosed its proposed Makohypersonic missile, a 1,300lb (590kg) weapon that can be carried internally in the F-22.[197] While capable of carrying weapons with GPS guidance such as JDAMs and SDBs, the F-22 cannot self-designate laser-guided weapons.[198]
F-22 with external weapons pylons
While the F-22 typically carries weapons internally, the wings include four hardpoints, each rated to handle 5,000lb (2,300kg). Each hardpoint can accommodate a pylon that can carry a detachable 600-gallon (2,270 L) external fuel tank or a launcher holding two air-to-air missiles; the two inboard hardpoints are "plumbed" for external fuel tanks. The two outboard hardpoints have since been dedicated to a pair of stealthy pods housing the IRST and mission systems. The aircraft can jettison external tanks and their pylon attachments to restore its low observable characteristics and kinematic performance.[199]
Maintenance
Each F-22 requires a three-week packaged maintenance plan (PMP) every 300 flight hours.[200] Its stealth coatings were designed to be more robust and weather-resistant than those of earlier stealth aircraft,[150] yet early coatings failed against rain and moisture when F-22s were initially posted to Guam in 2009.[201] Stealth measures account for almost one third of maintenance, with coatings being particularly demanding.[202][30] F-22 depot maintenance is performed at Ogden Air Logistics Complex at Hill AFB, Utah; considerable care is taken during maintenance due to the small fleet size and limited attrition reserve.[203]
F-22s were available for missions 63% of the time on average in 2015, up from 40% when it was introduced in 2005. Maintenance hours per flight hour was also improved from 30 early on to 10.5 by 2009, lower than the requirement of 12; man-hours per flight hour was 43 in 2014. When introduced, the F-22 had a Mean Time Between Maintenance (MTBM) of 1.7 hours, short of the required 3.0; this rose to 3.2 hours in 2012.[83][38] By fiscal year 2015, the cost per flight hour was $59,116, while the user reimbursement rate was approximately US$35,000 (~$41,145 in 2023) per flight hour in 2019.[204][205]
The 43rd Fighter Squadron was reactivated in 2002 as the F-22 Formal Training Unit (FTU) for the type's basic course at Tyndall AFB and the first aircraft for pilot training was delivered in September 2003. Following severe damage to the installation in the wake of Hurricane Michael in 2018, the squadron and its aircraft were relocated to nearby Eglin AFB; although it was initially feared that several jets were lost due to storm damage, all were later repaired and flown out.[206] The FTU and its aircraft were reassigned to the 71st Fighter Squadron at Langley AFB in 2023.[207]
As of 2014, B-Course students require 38 sorties to graduate (previously 43 sorties). Track 1 course pilots, pilots retraining from other aircraft, also saw a reduction in the number of sorties needed to graduate, from 19 to 12 sorties.[208] F-22 students are first trained on the T-38 Talon trainer aircraft. Additional pilot training takes place on the F-16 because the aging T-38 is not rated to sustain higher G-forces and lacks modern avionics.[209] Due to a lack of a modern trainer stand-in that can accurately emulate the F-22, the Air Force often uses F-22s to supplement training, which is costly as the F-22 costs almost 10 times more than the T-38 per flight hour.[210] The upcoming T-7 Red Hawk features modern avionics that better approximate those of the F-22 and F-35.[211] This is scheduled to enter initial operating capability in 2027, several years behind schedule.[212] In 2014 the Air Force stood up the 2nd Fighter Training Squadron at Tyndall AFB which was equipped with T-38s to serve as adversary aircraft to reduce adversary training flights on the F-22s.[213] To reduce operating costs and prolong the F-22's service life, some pilot training sorties are performed using flight simulators.[200] The advanced F-22 weapons instructor course at USAF Weapons School is conducted by the 433rd Weapons Squadron at Nellis AFB.[214]
Introduction into service
An F-22 fires an AIM-120 AMRAAM
The F-22 underwent extensive testing before its service introduction. While the first production aircraft was delivered to Edwards AFB in October 2002 for IOT&E and the first jet for the 422nd TES at Nellis AFB arrived in January 2003, IOT&E was continually pushed back from its planned start in mid-2003, with mission avionics stability being particularly challenging.[N 18][151] Following a preliminary assessment, called OT&E Phase 1, formal IOT&E began in April 2004 and was completed in December of that year. This milestone marked the successful demonstration of the jet's air-to-air mission capability, although the jet was more maintenance intensive than expected.[215] A Follow-On OT&E (FOT&E) in 2005 cleared the F-22's air-to-ground mission capability.[216]
The first combat ready F-22 of the 1st Fighter Wing arrived at Langley AFB, Virginia in January 2005 and that December, the USAF announced that the aircraft had achieved Initial Operational Capability (IOC) with the 94th Fighter Squadron.[217] The unit subsequently participated in Exercise Northern Edge 06 in Alaska in June 2006 and Exercise Red Flag 07–2 at Nellis AFB in February 2007, where it demonstrated the F-22's greatly increased air combat capabilities when flying against Red Force Aggressor F-15s and F-16s with a simulated kill ratio of 108–0. These large force exercises also further refined the F-22's operational tactics and employment.[51][218]
The F-22 achieved Full Operational Capability (FOC) in December 2007, when General John Corley of Air Combat Command (ACC) officially declared the F-22s of the integrated active duty 1st Fighter Wing and Virginia Air National Guard192d Fighter Wing fully operational.[219] This was followed by an Operational Readiness Inspection (ORI) of the integrated wing in April 2008, in which it was rated "excellent" in all categories, with a simulated kill-ratio of 221–0.[220] The fielding of the F-22 with its precision strike capability also contributed to the retirement of the F-117 from operational service in 2008, with the 49th Fighter Wing operating the F-22 for a brief period prior to a series of fleet consolidations to reduce long term operational costs;[221] further consolidations to improve availability and pilot training were recommended by the Government Accountability Office in 2018.[222]
Initial operational problems
During the initial years of service, F-22 pilots experienced symptoms as a result of oxygen system issues that include loss of consciousness, memory loss, emotional lability and neurological changes as well as lingering respiratory problems and a chronic cough; the issues resulted in a fatal mishap in 2010 and four-month grounding in 2011 and subsequent altitude and distance flight restrictions.[223][224] In August 2012, the DoD found that the BRAG valve, which inflated the pilot's vest during high-g maneuvers, was defective and restricted breathing and the OBOGS (onboard oxygen generation system) unexpectedly fluctuated oxygen levels at high g.[225][226] A Raptor Aeromedical Working Group had recommended changes in 2005 regarding oxygen supply that were unfunded but received further consideration in 2012.[227][228] The F-22 CTF and 412th Aerospace Medicine Squadron eventually determined breathing restrictions as the root cause; coughing symptoms were attributed to acceleration atelectasis[N 19] from high g exposure and OBOGS delivering excessive oxygen concentration. The presence of toxins and particles in some ground crew was deemed unrelated.[229] Modifications to the life support and oxygen systems, including the installation of an automatic backup, allowed altitude and distance restrictions to be lifted in April 2013.[230]
Operational service
An F-22 from Elmendorf AFB, Alaska, intercepting a Russian Tupolev Tu-95 bomber near American airspace
Following IOC and large-scale exercises, the F-22 flew its first homeland defense mission in January 2007 under Operation Noble Eagle. In November 2007, F-22s of 90th Fighter Squadron at Elmendorf AFB, Alaska, performed their first North American Aerospace Defense Command (NORAD) interception of two Russian Tu-95MS bombers.[231] Since then, F-22s have also escorted probing Tu-160 bombers.[232]
The F-22 was first deployed overseas in February 2007 with the 27th Fighter Squadron to Kadena Air Base in Okinawa, Japan.[233] This first overseas deployment was initially marred by problems when six F-22s flying from Hickam AFB, Hawaii, experienced multiple software-related system failures while crossing the International Date Line (180th meridian of longitude). The aircraft returned to Hawaii by following tanker aircraft. Within 48 hours, the error was resolved and the journey resumed.[234][235] Kadena would be a frequent rotation for F-22 units; they have also been involved in training exercises in South Korea, Malaysia, and the Philippines.[236][237][238]
Defense Secretary Gates initially refused to deploy F-22s to the Middle East in 2007;[239] the type made its first deployment in the region at Al Dhafra Air Base in the UAE in 2009. In April 2012, F-22s have been rotating into Al Dhafra, less than 200 miles from Iran.[240][241] In March 2013, the USAF announced that an F-22 had intercepted an Iranian F-4 Phantom II that approached within 16 miles of an MQ-1 Predator flying off the Iranian coastline.[242]
An F-22 refueling prior to combat operations in Syria, September 2014
On 22 September 2014, F-22s performed the type's first combat sorties by conducting some of the opening strikes of Operation Inherent Resolve, the American-led intervention in Syria; aircraft dropped 1,000-pound GPS-guided bombs on Islamic State targets near Tishrin Dam.[243][244] Between September 2014 and July 2015, F-22s flew 204 sorties over Syria, dropping 270 bombs at some 60 locations.[245] Throughout their deployment, F-22s conducted close air support (CAS) and also deterred Syrian, Iranian, and Russian aircraft from attacking U.S.-backed Kurdish forces and disrupting U.S. operations in the region.[246][247][248] F-22s also participated in the U.S. strikes that defeated pro-Assad and Russian Wagner Group paramilitary forces near Khasham in eastern Syria on 7 February 2018.[249][250][251] These strikes notwithstanding, the F-22's main role in the operation was conducting intelligence, surveillance and reconnaissance.[252] The aircraft also performed missions in other regions of the Middle East; in November 2017, F-22s operating alongside B-52s bombed opium production and storage facilities in Taliban-controlled regions of Afghanistan.[253][204]
An F-22 lands on Iōtō (Iwo Jima) in April 2024 during Agile Reaper 24-1
To increase deployment responsiveness and reduce logistical footprint in a peer or near-peer conflict, the USAF developed a deployment concept called Rapid Raptor which involves two to four F-22s and one C-17 for logistical support, first proposed in 2008 by two F-22 pilots. The goal was for the type to be able to set up and engage in combat within 24 hours in smaller and more austere environments that would enable more dispersed and survivable disposition of forces. This concept was tested at Wake Island in 2013 and Guam in late 2014.[254][255][256] Four F-22s were deployed to Spangdahlem Air Base in Germany, Łask Air Base in Poland, and Ämari Air Base in Estonia in August and September 2015 to further test the concept and train with NATO allies in response to the Russian annexation of Crimea in 2014.[257] The USAF would build on the principles of Rapid Raptor and eventually integrate it into its new operational concept called Agile Combat Employment, which shifts towards distributed operations during peer conflicts; for instance, detachments of F-22s have operated from austere airfields on Tinian and Iwo Jima during exercises.[258][259]
On 4 February 2023, an F-22 of the 1st Fighter Wing shot down a suspected Chinese spy balloon within visual range off the coast of South Carolina at an altitude of 60,000 to 65,000 feet (20,000m),[260] marking the F-22's first air-to-air kill.[261] The wreckage landed approximately 6 miles offshore and was subsequently secured by ships of the U.S. Navy and U.S. Coast Guard.[262] F-22s shot down additional high-altitude objects near the coast of Alaska on 10 February and over Yukon on 11 February.[263]
The USAF expects to begin retiring the F-22 in the 2030s as it gets replaced by the Next Generation Air Dominance (NGAD) crewed fighter.[264][265][266] In May 2021, Air Force Chief of Staff Charles Q. Brown Jr. said that he envisioned a reduction in the future number of fighter fleets to "four plus one": the F-22 followed by NGAD, the F-35A, the F-15E followed by F-15EX, the F-16 followed by "MR-X", and the A-10; the A-10 was later dropped from the plans due that aircraft's accelerated retirement.[267][268] In 2022 the Air Force requested that it be allowed to divest all but three of its Block 20 F-22s at Tyndall AFB.[269] Congress denied the request to divest its 33 non-combat-coded Block 20 aircraft and passed language prohibiting the divestment through FY2026.[270] While the Block 30/35 F-22 remains one of the USAF's top priorities and will be continually updated, the service believes the Block 20 aircraft is obsolescent and unsuitable even for training F-22 pilots and that upgrading them to Block 30/35 standards would be cost-prohibitive at $3.5 billion.[271][272]
Variants
For the technology demonstrator prototype and proposed naval version, see Lockheed YF-22.
3-view drawings of the planned two-seat F-22B
F-22A
Single-seat version, was designated F/A-22A in early 2000s before reverting back to F-22A in 2005; 195 built, consisting of 8 test and 187 production aircraft.[97][98][N 1]
F-22B
Planned two-seat version with the same combat capabilities as the single-seat version, cancelled in 1996 to save development costs with test aircraft orders converted to F-22A.[273]
Never formally designated, planned carrier-borne variant/derivative for the U.S. Navy's Navy Advanced Tactical Fighter (NATF) program. Because the NATF needed lower landing speeds than the F-22 for aircraft carrier operations while still attaining Mach 2-class speeds, the design would have incorporated variable-sweep wings; it would also have had expanded weapons carriage, including the AIM-152 AAAM, AGM-88 HARM, and AGM-84 Harpoon. Program was cancelled in 1991 due to tightening budgets.[273][274]
Proposed derivatives
The X-44 MANTA, or multi-axis, no-tail aircraft, was a planned experimental aircraft based on the F-22 with enhanced thrust vectoring controls and no aerodynamic surface backup.[275] The aircraft was to be solely controlled by thrust vectoring, without featuring any rudders, ailerons, or elevators. Funding for this program was halted in 2000.[276]
The FB-22 was proposed in the early 2000s as a supersonic stealth regional bomber for the USAF.[277] The design went through several iterations and the later ones would combine an F-22 fuselage with greatly enlarged delta wings and was projected to carry up to 30 Small Diameter Bombs to over 1,600nmi (3,000km), about twice the combat range of the F-22A.[278] The FB-22 proposals were cancelled with the 2006 Quadrennial Defense Review and subsequent developments, in lieu of a larger subsonic strategic bomber with a much greater range; this became the Next-Generation Bomber, although it would be rescoped in 2009 as the Long Range Strike Bomber resulting in the B-21 Raider.[122][279][280]
In August 2018, Lockheed Martin proposed an F-22 derivative to the Japan Air Self-Defense Force (JASDF) for its 5th/6th generation F-X program. The design, which was later also proposed to the USAF, would combine a modified F-22 airframe with enlarged wings to increase fuel capacity and combat radius to 1,200nmi (2,200km) as well as the avionics and improved stealth coatings of the F-35.[281][282] The proposal was ultimately not considered by the USAF or JASDF due to cost as well as existing export restrictions and industrial workshare concerns.[283][284]
Operators
F-22 from Tyndall Air Force Base, Florida, cruising over the Florida PanhandleAn F-22 landing at Holloman AFB, New MexicoAn F-22, based at Elmendorf AFB, Alaska, over mountain terrainF-22 with drop tanks in transit to Kadena Air Base, Japan, from Langley AFB, Virginia
The United States Air Force is the only operator of the F-22. As of August 2022, it has 183 aircraft in its inventory.[35]
The first F-22 crash occurred during takeoff at Nellis AFB on 20 December 2004, in which the pilot ejected safely before impact.[291] The investigation revealed that a brief interruption in power during an engine shutdown prior to flight caused a flight-control system malfunction;[292] consequently the aircraft design was corrected to avoid the problem. Following a brief grounding, F-22 operations resumed after a review.[293]
On 25 March 2009, an EMD F-22 crashed 35 miles (56km) northeast of Edwards AFB during a test flight, resulting in the death of Lockheed Martin test pilot David P. Cooley. An Air Force Materiel Command investigation found that Cooley momentarily lost consciousness during a high-G maneuver, or g-LOC, then ejected when he found himself too low to recover. Cooley was killed during ejection by blunt-force trauma from windblast due to the aircraft's speed. The investigation found no design issues.[294][295]
On 16 November 2010, an F-22 from Elmendorf AFB crashed, killing the pilot, Captain Jeffrey Haney. F-22s were restricted to flying below 25,000 feet, then grounded during the investigation.[296] The crash was attributed to a bleed air system malfunction after an engine overheat condition was detected, shutting down the Environmental Control System (ECS) and OBOGS. The accident review board ruled Haney was to blame, as he did not react properly to engage the emergency oxygen system.[297] Haney's widow sued Lockheed Martin, claiming equipment defects, and later reached a settlement.[298][229] After the ruling, the emergency oxygen system engagement handle was redesigned and the entire system was eventually replaced by an automatic backup.[299][300] On 11 February 2013, the DoD's Inspector General released a report stating that the USAF had erred in blaming Haney, and that facts did not sufficiently support conclusions; the USAF stated that it stood by the ruling.[301]
On 15 November 2012, an F-22 crashed to the east of Tyndall AFB during a training mission. The pilot ejected safely and no injuries were reported on the ground.[302] The investigation determined that a "chafed" electrical wire ignited the fluid in a hydraulic line, causing a fire that damaged the flight controls.[303]
On 15 May 2020, an F-22 from Eglin Air Force Base crashed during a routine training mission shortly after takeoff; the pilot ejected safely. The cause of the crash was attributed to a maintenance error after an aircraft wash resulting in faulty air data sensor readings.[304]
Aircraft on display
F-22A 91-4003 at the National Museum of the United States Air Force in Dayton, Ohio
F-22 Raptor 3-view drawingsUSAF poster of key F-22 features and armamentF-22's underside with main bay doors openF-22's diamond-like delta wing planform
4× under-wing pylon stations can be fitted to carry weapons, each with a capacity of 5,000 lb (2,270 kg) or 600 U.S. gallon (2,270 L) drop tanks[313]
4x AIM-120 AMRAAM (external)
Avionics
AN/APG-77 or AN/APG-77(V)1 AESA radar: 125–150 miles (201–241km) against 1m2 (11sqft) targets (estimated range), more than 250 miles (400km) in narrow beams
1 2 3 Total production run consisted of 9 EMD and 186 production aircraft; the last two EMD aircraft were close to Production Representative Test Vehicle (PRTV) configuration, while one of the production aircraft was a dedicated flight sciences vehicle; at times, the production run was listed as 8 test and 187 production aircraft.
↑ Referring to statements made by the Secretary of Defense Robert Gates: "The secretary once again highlighted his ambitious next-year request for the more-versatile F-35s."[2]
↑ The greatly increased stealth requirements arose from the SPO's discussions with Lockheed and Northrop, the two companies with prior stealth experience from the "Senior Trend"/F-117 and "Senior Ice"/B-2 respectively.[7]
↑ The seven bidding companies for Dem/Val were Lockheed, Northrop, General Dynamics, Boeing, McDonnell Douglas, Grumman, and North American Rockwell.[9]
↑ Lockheed's design had considerable variations throughout concept exploration, ranging from SR-71/YF-12-like, to faceted designs similar to the F-117, to a curved surface design with an arrowhead-like planform as the company became able to design stealthy shapes with curved surfaces.[10]
↑ The contractor teams were to give the SPO "sealed envelope" flight performance predictions against which their prototypes would be evaluated, rather than against each other.[11]
↑ The YF-22 outer lines were frozen relatively soon after the complete redesign of the configuration in summer of 1987 so that construction could begin in 1988, resulting in the shaping being rather unrefined, especially compared to the YF-23.[22]
↑ The YF-22 was originally given the unofficial name "Lightning II", from the World War II Lockheed P-38 Lightning fighter which persisted until the mid-1990s, when the USAF officially named the F-22 "Raptor". The aircraft was also briefly dubbed "SuperStar" and "Rapier".[32]
↑ Metz was previously the chief test pilot for the YF-23.
↑ Another reason other than funding issues, the F-22’s superior combat capability, has been attributed to cuts to F-22 buys. In 1997, Defense Secretary William Cohen, for example, cited this as a reason for that year’s Quadrennial Defense Review’s (QDR) proposed reduction to 341 aircraft.[46]
↑ Block number designates production variation groups.
↑ The combat-coded fleet consist of 123 primary and 20 reserve airframes, while several Block 30 aircraft are devoted to operational testing and tactics development at Nellis AFB.[61]
↑ This capability was demonstrated in 2005 when General John P. Jumper exceeded Mach 1.7 in the F-22 without afterburners. When flying at Mach 2.0 at 40,000 feet (12,000m) in steady level flight, the F-22 is only using 118% throttle out of 150% available (with 100% being military/intermediate power and 150% being full afterburner). Time from brake release to Mach 1.7 at 60,000 feet (18,000m) level flight is less than 3 minutes 30 seconds.[139][140]
↑ In testing, an F-22 cruising at Mach 1.5 at 50,000 feet (15,000m) struck a moving target 24 miles (39km) away with a JDAM.[145]
↑ The fuselage and wing structure was tested to validate survivability against 30 mm cannon fire.[136]
↑ "... noting that Raptors are ready for a mission around 62 percent of the time, if its low-observable requirements are met (DAILY, 20 November). Reliability goes up above 70 percent for missions with lower stealth demands."[160]
↑ Former Secretary of the USAF Michael Wynne blamed the use of the DoD's Ada for cost overruns and delays on many military projects, including the F-22, mistakenly referring to Ada as an operating system rather than a programming language, and citing "the scramble to retain talent for ADA when careers were being made in DOS, Apple and LINUX".[175]
↑ In 2002–2003, the F-22's software reliability was highly inadequate, needing to initiate an avionics system restart (which took minutes to cycle) every 1.9 hours despite the requirement for "mean-time between instability events" being over 20 hours. The integrated avionics software was frequently "crashing" and requiring in-flight reboots.[215]
↑ Atelectasis is the collapse or closure of a lung resulting in reduced or absent gas exchange.
↑ 860 nmi subsonic with 2× 600 U.S. gal tanks. All figures include −6% routing factor, combat and 2× GBU-32 + 2× AIM-9 + 2× AIM-120.
Related Research Articles
The Northrop B-2 Spirit, also known as the Stealth Bomber, is an American heavy strategic bomber, featuring low-observable stealth technology designed to penetrate dense anti-aircraft defenses. A subsonic flying wing with a crew of two, the plane was designed by Northrop as the prime contractor, with Boeing, Hughes, and Vought as principal subcontractors, and was produced from 1987 to 2000. The bomber can drop conventional and thermonuclear weapons, such as up to eighty 500-pound class (230 kg) Mk 82 JDAM GPS-guided bombs, or sixteen 2,400-pound (1,100 kg) B83 nuclear bombs. The B-2 is the only acknowledged in-service aircraft that can carry large air-to-surface standoff weapons in a stealth configuration.
The Lockheed F-117 Nighthawk is a retired American single-seat, subsonic twin-engine stealth attack aircraft developed by Lockheed's secretive Skunk Works division and operated by the United States Air Force (USAF). It was the first operational aircraft to be designed with stealth technology.
The Lockheed Martin F-35 Lightning II is an American family of single-seat, single-engine, supersonic stealth strike fighters. A multirole combat aircraft designed for both air superiority and strike missions, it also has electronic warfare and intelligence, surveillance, and reconnaissance capabilities. Lockheed Martin is the prime F-35 contractor with principal partners Northrop Grumman and BAE Systems. The aircraft has three main variants: the conventional takeoff and landing (CTOL) F-35A, the short take-off and vertical-landing (STOVL) F-35B, and the carrier variant (CV) catapult-assisted take-off but arrested recovery (CATOBAR) F-35C.
Tyndall Air Force Base is a United States Air Force Base located 12 miles (19 km) east of Panama City, Florida. The base was named in honor of World War I pilot 1st Lt. Frank Benjamin Tyndall. The base operating unit and host wing is the 325th Fighter Wing of the Air Combat Command (ACC). The base hosts 2,902 active duty members. In October 2018, Hurricane Michael caused significant damage to the base.
The Lockheed F-94 Starfire is a first-generation jet powered all-weather day/night interceptor aircraft designed and produced by Lockheed Corporation. It was the first operational United States Air Force (USAF) fighter equipped with an afterburner as well as being the first jet-powered all-weather fighter to enter combat during the Korean War.
The Northrop/McDonnell Douglas YF-23 is an American single-seat, twin-engine, stealth fighter technology demonstrator prototype designed for the United States Air Force (USAF). The design team, with Northrop as the prime contractor, was a finalist in the USAF's Advanced Tactical Fighter (ATF) demonstration/validation competition, battling the YF-22 team for full-scale development and production. Two YF-23 prototypes were built.
The Lockheed Martin X-44 MANTA was an American conceptual aircraft design by Lockheed Martin that has been studied by NASA and the U.S. Air Force. It was intended to test the feasibility of full yaw, pitch and roll authority without tailplanes. Attitude control would rely purely on 3D thrust vectoring. The aircraft design was derived from the F-22 Raptor and featured a stretched delta wing without tail surfaces.
The Advanced Tactical Fighter (ATF) was a program undertaken by the United States Air Force to develop a next-generation air superiority fighter to replace the F-15 Eagle in order to counter emerging worldwide threats in the 1980s, including Soviet Sukhoi Su-27 and Mikoyan MiG-29 fighters under development, Beriev A-50 airborne warning and control systems (AWACS), and increasingly sophisticated surface-to-air missile systems. The ATF would make a leap in performance and capability by taking advantage of emerging technologies, including advanced avionics and flight control systems, more powerful propulsion systems, and stealth technology.
The Lockheed/Boeing/General Dynamics YF-22 is an American single-seat, twin-engine, stealth fighter technology demonstrator prototype designed for the United States Air Force (USAF). The design team, with Lockheed as the prime contractor, was a finalist in the USAF's Advanced Tactical Fighter (ATF) competition, and two prototypes were built for the demonstration/validation phase. The YF-22 team won the contest against the YF-23 team for full-scale development and the design was developed into the Lockheed Martin F-22. The YF-22 has a similar aerodynamic layout and configuration as the F-22, but with notable differences in the overall shaping such as the position and design of the cockpit, tail fins and wings, and in internal structural layout.
The Lockheed Martin FB-22 was a proposed supersonic stealth bomber aircraft for the United States Air Force, derived from the F-22 Raptor air superiority fighter. Lockheed Martin proposed its design in the early 2000s with support from certain Air Force leaders as an interim "regional bomber" to complement the aging U.S. strategic bomber fleet, whose replacement was planned to enter service after 2037. The FB-22 was to leverage much of the design work and components from the F-22 to reduce development costs.
Holloman Air Force Base is a United States Air Force base established in 1942 located six miles (10 km) southwest of the central business district of Alamogordo, which is the county seat of Otero County, New Mexico, United States. The base was named in honor of Col. George V. Holloman, a pioneer in guided missile research. It is the home of the 49th Wing of the Air Education and Training Command (AETC).
The Air Force Test Center (AFTC) is a development and test organization of the United States Air Force. It conducts research, development, test, and evaluation of aerospace systems from concept to deployment. It has test flown every aircraft in the Army Air Force's and the Air Force's inventory since World War II. The center employs nearly 13,000 people, and controls the second largest base in the Air Force.
The 412th Test Wing is a wing of the United States Air Force, assigned to the Air Force Test Center at Edwards Air Force Base, California.
The 199th Fighter Squadron is a unit of the Hawaii Air National Guard 154th Wing located at Joint Base Pearl Harbor–Hickam, Honolulu, Hawaii. The 199th is equipped with the F-22A Raptor.
The 8th Fighter Squadron is an active United States Air Force squadron, assigned to the 54th Fighter Group Air Education and Training Command, stationed at Holloman Air Force Base, New Mexico. It currently operates the General Dynamics F-16 Fighting Falcon aircraft, conducting initial training, transition and instructor upgrades training. The squadron have a proud lineage of aircraft and assignments. The origin of the 8th Fighter Squadron can be traced back to 1940, and since then, the squadron has served in several war and peace time assignments across the globe.
The 7th Fighter Squadron is an active United States Air Force unit, assigned to the 1st Operations Group. It is stationed at Langley Air Force Base, Virginia.
The 4450th Tactical Group is an inactive United States Air Force unit. It was headquartered at Nellis Air Force Base, Nevada, and operationally located at Tonopah Test Range Airport, Nevada. It was inactivated on 5 October 1989.
A fifth-generation fighter is a jet fighter aircraft classification which includes major technologies developed during the first part of the 21st century. As of 2024, these are the most advanced fighters in operation. The characteristics of a fifth-generation fighter are not universally agreed upon, and not every fifth-generation type necessarily has them all; however, they typically include stealth, low-probability-of-intercept radar (LPIR), agile airframes with supercruise performance, advanced avionics features, and highly integrated computer systems capable of networking with other elements within the battlespace for situational awareness and C3 (command, control and communications) capabilities.
Elmendorf Air Force Base is a United States Air Force (USAF) facility in Anchorage, Alaska. Originally known as Elmendorf Field, it became Elmendorf Air Force Base after World War II.
Steven M. Rainey is a test pilot and retired United States Air Force (USAF) officer. As of 2022, he is a test pilot for Stratolaunch Systems working on the Scaled Composites Stratolaunch aircraft. Previously, he was Lockheed Martin's chief F-22 test pilot, Boeing's lead F-22 test pilot, and commander of the USAF 411th Flight Test Squadron. He is noted for a number of achievements while flight testing the Lockheed Martin F-22 Raptor. He was the first USAF pilot to fly the aircraft, the first pilot to perform aerial refueling in the F-22, and the first pilot to fly cross-country in the Raptor.
↑ Sweetman, Bill (30 November 2010). "Rivals Target JSF". Aviation Week. McGraw Hill. Archived from the original on 19 August 2016. Retrieved 31 August 2011.
↑ Schanz, Marc V. (1 April 2012). "Raptors for the long haul". Air Force Magazine. Archived from the original on 11 August 2022. Retrieved 13 March 2023.
↑ SASC Transcripts(PDF) (Report). U.S. Senate, Committee on Armed Services. 9 July 2009. Archived from the original(PDF) on 17 May 2013.
↑ Schwartz, Norton; Levinson, Ron; Schwartz, Suzie (2 January 2018). Journey: Memoirs of an Air Force Chief of Staff. Skyhorse Publishing. ISBN9781510710344.
↑ Gates, Robert (16 July 2009). Economic Club of Chicago (Speech). Economic Club of Chicago. Chicago, Illinois: US Department of Defense. Archived from the original on 28 February 2010. Retrieved 1 November 2013.
↑ Ayton, Mark (22 December 2016). "Testing the Combat Edge". Air Forces Monthly. Archived from the original on 13 September 2022. Retrieved 13 March 2023.
↑ Carlson, Maj. Gen. Bruce. "Subject: Stealth Fighters."Archived 29 August 2010 at the Wayback MachineU.S. Department of Defense Office of the Assistant Secretary of Defense (Public Affairs) News Transcript. Retrieved 28 August 2011.
↑ Jenn, D. (Fall 2011). "RCS Reduction (Lecture Notes)"(PDF). Naval Postgraduate School. Archived(PDF) from the original on 22 December 2022. Retrieved 13 March 2023.
↑ "Analogues of Stealth"(PDF) (analysis paper). Northrop Grumman. 27 April 2012. Archived(PDF) from the original on 19 February 2018. Retrieved 10 April 2019.
↑ Metz, Alfred "Paul" (September 1998). "Just How Good Is The F-22 Raptor?" (Interview). Interviewed by Kopp, Carlo. Air Power International. Archived from the original on 7 December 2006. Retrieved 30 June 2007.
↑ "Military Avionics Systems", Ian Moir and Allan Seabridge, Wiley, pp. 360
↑ Schanz, Marc (28 September 2013). "Rapid Raptor Package". Air force Magazine. Air Force Association. Archived from the original on 29 September 2013. Retrieved 1 October 2013.
↑ Bolkcom, Christopher (26 May 2004). Air Force FB-22 Bomber Concept (Report). U.S. Congressional Research Service. Archived from the original on 9 July 2017. Retrieved 28 August 2011– via Digital.library.unt.edu.
↑ Del Oso, Senior Airman Tiffany (6 April 2023). "The 43d Fighter Squadron's final sting". Tyndall Air Force Base. 325th Fighter Wing Public Affairs. Retrieved 2 March 2024.
Bolkcom, Christopher (12 June 2007). CRS Reports for Congress F-22A Raptor(PDF). Congressional Research Service (Report). Retrieved 26 February 2024. This article incorporates text from this source, which is in the public domain.
Jenkins, Dennis R.; Landis, Tony R. (2008). Experimental & Prototype U.S. Air Force Jet Fighters. North Branch, Minnesota: Specialty Press. ISBN978-1-58007-111-6.
Miller, Jay (2005). Lockheed Martin F/A-22 Raptor, Stealth Fighter. Hinckley, UK: Midland Publishing. ISBN1-85780-158-X.
Miller, Jay (1995). Lockheed Martin's Skunk Works: The Official History... Leicester, UK: Midland Publishing. ISBN1-85780-037-0.
Mullin, Sherman N. (June 2012). "Winning the ATF"(PDF). Mitchell Institute for Airpower Studies.
Mullin, Sherman N. (24 January 2019). "Oral history interview with Sherman Mullin. Second Interview". Aerospace Oral History Project (Interview). Interviewed by Westwick, Peter; Deverell, William. San Marino, California: The Huntington Library, Art Museum, and Botanical Gardens.
Pace, Steve (1999). F-22 Raptor: America's Next Lethal War Machine. New York: McGraw-Hill. ISBN0-07-134271-0.
Polmar, Norman (2005). The Naval Institute Guide to the Ships and Aircraft of the U.S. Fleet. Annapolis, Maryland: Naval Institute Press. ISBN978-1-59114-685-8.
------- (1998). F-22 Raptor. St. Paul, Minnesota, USA: Motorbooks International Publishing. ISBN0-7603-0484-X.
Williams, Mel, ed. (2002). "Lockheed Martin F-22A Raptor". Superfighters: The Next Generation of Combat Aircraft. London: AIRtime Publishing. ISBN1-880588-53-6.
This page is based on this Wikipedia article Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.
