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The Lockheed Martin F-35 Lightning II is an American family of single-seat, single-engine, all-weather
stealth Stealth may refer to: Military * Stealth technology, technology used to conceal ships, aircraft, and missiles ** Stealth aircraft, aircraft which use stealth technology **Stealth ground vehicle, ground vehicles which use stealth technology ** St ...
multirole combat aircraft A multirole combat aircraft (MRCA) is a combat aircraft intended to perform different roles in combat. These roles can include air to air combat, air support, aerial bombing, reconnaissance, electronic warfare, and suppression of air defen ...
that is intended to perform both
air superiority Aerial supremacy (also air superiority) is the degree to which a side in a conflict holds control of air power over opposing forces. There are levels of control of the air in aerial warfare. Control of the air is the aerial equivalent of com ...
and strike missions. It is also able to provide
electronic warfare Electronic warfare (EW) is any action involving the use of the electromagnetic spectrum (EM spectrum) or directed energy to control the spectrum, attack an enemy, or impede enemy assaults. The purpose of electronic warfare is to deny the opponent ...
and intelligence, surveillance, and reconnaissance capabilities.
Lockheed Martin The Lockheed Martin Corporation is an American aerospace, arms, defense, information security, and technology corporation with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It ...
is the prime F-35 contractor, with principal partners
Northrop Grumman Northrop Grumman Corporation is an American multinational aerospace and defense technology company. With 90,000 employees and an annual revenue in excess of $30 billion, it is one of the world's largest weapons manufacturers and military tech ...
and
BAE Systems BAE Systems plc (BAE) is a British multinational arms, security, and aerospace company based in London, England. It is the largest defence contractor in Europe, and ranked the seventh-largest in the world based on applicable 2021 revenue ...
. 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-based Carrier-based aircraft, sometimes known as carrier-capable aircraft or carrier-borne aircraft, are naval aircraft Naval aviation is the application of military air power by navies, whether from warships that embark aircraft, or land base ...
(CV/
CATOBAR CATOBAR ("Catapult Assisted Take-Off But Arrested Recovery" or "Catapult Assisted Take-Off Barrier Arrested Recovery") is a system used for the launch and recovery of aircraft from the deck of an aircraft carrier. Under this technique, aircraft ...
) F-35C. The aircraft descends from the Lockheed Martin X-35, which in 2001 beat the
Boeing X-32 The Boeing X-32 is a concept demonstrator aircraft that was designed for the Joint Strike Fighter competition. It lost to the Lockheed Martin X-35 demonstrator, which was further developed into the Lockheed Martin F-35 Lightning II. Develop ...
to win the Joint Strike Fighter (JSF) program. Its development is principally funded by the United States, with additional funding from program partner countries from
NATO The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two N ...
and close U.S. allies, including the United Kingdom, Australia, Canada, Italy, Norway, Denmark, the Netherlands, and formerly Turkey. Several other countries have also ordered, or are considering ordering, the aircraft. The program has drawn much scrutiny and criticism for its unprecedented size, complexity, ballooning costs, and much-delayed deliveries. The acquisition strategy of concurrent production of the aircraft while it was still in development and testing led to expensive design changes and retrofits. The F-35 first flew in 2006 and entered service with the U.S. Marine Corps F-35B in July 2015, followed by the U.S. Air Force F-35A in August 2016 and the U.S. Navy F-35C in February 2019. The aircraft was first used in combat in 2018 by the
Israeli Air Force The Israeli Air Force (IAF; he, זְרוֹעַ הָאֲוִיר וְהֶחָלָל, Zroa HaAvir VeHahalal, tl, "Air and Space Arm", commonly known as , ''Kheil HaAvir'', "Air Corps") operates as the aerial warfare branch of the Israel Defens ...
. The U.S. plans to buy 2,456 F-35s through 2044, which will represent the bulk of the crewed tactical aviation of the U.S. Air Force, Navy, and Marine Corps for several decades; the aircraft is planned to be a cornerstone of NATO and U.S.-allied air power and to operate until 2070.


Development


Program origins

The F-35 was the product of the Joint Strike Fighter (JSF) program, which was the merger of various combat aircraft programs from the 1980s and 1990s. One progenitor program was the Defense Advanced Research Projects Agency (DARPA) Advanced Short Take-Off/Vertical Landing (ASTOVL) which ran from 1983 to 1994; ASTOVL aimed to develop a Harrier jump jet replacement for the U.S. Marine Corps (USMC) and the U.K.
Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against Fr ...
. Under one of ASTOVL's classified programs, the Supersonic STOVL Fighter (SSF), Lockheed
Skunk Works Skunk Works is an official pseudonym for Lockheed Martin's Advanced Development Programs (ADP), formerly called Lockheed Advanced Development Projects. It is responsible for a number of aircraft designs, beginning with the P-38 Lightning in ...
conducted research for a stealthy supersonic STOVL fighter intended for both U.S. Air Force (USAF) and USMC; a key technology explored was the shaft-driven lift fan (SDLF) system. Lockheed's concept was a single-engine canard delta aircraft weighing about empty. ASTOVL was rechristened as the Common Affordable Lightweight Fighter (CALF) in 1993 and involved Lockheed,
McDonnell Douglas McDonnell Douglas was a major American aerospace manufacturing corporation and defense contractor, formed by the merger of McDonnell Aircraft and the Douglas Aircraft Company in 1967. Between then and its own merger with Boeing in 1997, it ...
, and
Boeing The Boeing Company () is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, telecommunications equipment, and missiles worldwide. The company also provides leasing and ...
. In 1993, the Joint Advanced Strike Technology (JAST) program emerged following the cancellation of the USAF's Multi-Role Fighter (MRF) and U.S. Navy's (USN) Advanced Fighter-Attack (A/F-X) programs. MRF, a program for a relatively affordable
F-16 The General Dynamics F-16 Fighting Falcon is a single-engine multirole fighter aircraft originally developed by General Dynamics for the United States Air Force (USAF). Designed as an air superiority day fighter, it evolved into a successf ...
replacement, was scaled back and delayed due to post–Cold War defense posture easing F-16 fleet usage and thus extending its service life as well as increasing budget pressure from the F-22 Advanced Tactical Fighter (ATF) program. The A/F-X, initially known as the Advanced-Attack (A-X), began in 1991 as the USN's follow-on to the Advanced Tactical Aircraft (ATA) program for an A-6 replacement; the ATA's resulting A-12 Avenger II had been canceled due to technical problems and cost overruns in 1991. In the same year, the termination of the Naval Advanced Tactical Fighter (NATF), a naval development of USAF's ATF program to replace the F-14, resulted in additional fighter capability being added to A-X, which was then renamed A/F-X. Amid increased budget pressure, the
Department of Defense Department of Defence or Department of Defense may refer to: Current departments of defence * Department of Defence (Australia) * Department of National Defence (Canada) * Department of Defence (Ireland) * Department of National Defense (Philipp ...
's (DoD) Bottom-Up Review (BUR) in September 1993 announced MRF's and A/F-X's cancellations, with applicable experience brought to the emerging JAST program. JAST was not meant to develop a new aircraft, but rather to develop requirements, mature technologies, and demonstrate concepts for advanced strike warfare. As JAST progressed, the need for concept demonstrator aircraft by 1996 emerged, which would coincide with the full-scale flight demonstrator phase of ASTOVL/CALF. Because the ASTOVL/CALF concept appeared to align with the JAST charter, the two programs were eventually merged in 1994 under the JAST name, with the program now serving the USAF, USMC, and USN. JAST was subsequently renamed to Joint Strike Fighter (JSF) in 1995, with STOVL submissions by McDonnell Douglas,
Northrop Grumman Northrop Grumman Corporation is an American multinational aerospace and defense technology company. With 90,000 employees and an annual revenue in excess of $30 billion, it is one of the world's largest weapons manufacturers and military tech ...
,
Lockheed Martin The Lockheed Martin Corporation is an American aerospace, arms, defense, information security, and technology corporation with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It ...
, and Boeing. The JSF was expected to eventually replace large numbers of multi-role and strike fighters in the inventories of the US and its allies, including the Harrier, F-16, F/A-18, A-10, and F-117. International participation is a key aspect of the JSF program, starting with United Kingdom participation in the ASTOVL program. Many international partners requiring modernization of their air forces were interested in the JSF. The United Kingdom joined JAST/JSF as a founding member in 1995 and thus became the only Tier 1 partner of the JSF program; Italy, the Netherlands, Denmark, Norway, Canada, Australia, and Turkey joined the program during the Concept Demonstration Phase (CDP), with Italy and the Netherlands being Tier 2 partners and the rest Tier 3. Consequently, the aircraft was developed in cooperation with international partners and available for export.


JSF competition

Boeing and Lockheed Martin were selected in early 1997 for CDP, with their concept demonstrator aircraft designated X-32 and
X-35 The Lockheed Martin X-35 is a concept demonstrator aircraft (CDA) developed by Lockheed Martin for the Joint Strike Fighter program. The X-35 was declared the winner over the competing Boeing X-32 and a developed, armed version went on to enter ...
respectively; the McDonnell Douglas team was eliminated and Northrop Grumman and
British Aerospace British Aerospace plc (BAe) was a British aircraft, munitions and defence-systems manufacturer. Its head office was at Warwick House in the Farnborough Aerospace Centre in Farnborough, Hampshire. Formed in 1977, in 1999 it purchased Marconi ...
joined the Lockheed Martin team. Each firm would produce two prototype air vehicles to demonstrate conventional takeoff and landing (CTOL), carrier takeoff and landing (CV), and STOVL. Lockheed Martin's design would make use of the work on the SDLF system conducted under the ASTOVL/CALF program. The key aspect of the X-35 that enabled STOVL operation, the SDLF system consists of the lift fan in the forward center fuselage that could be activated by engaging a clutch that connects the driveshaft to the turbines and thus augmenting the thrust from the engine's swivel nozzle. Research from prior aircraft incorporating similar systems, such as the Convair Model 200,
Rockwell XFV-12 The Rockwell XFV-12 was a prototype supersonic United States Navy fighter which was built in 1977. The XFV-12 design attempted to combine the Mach 2 speed and AIM-7 Sparrow armament of the McDonnell Douglas F-4 Phantom II in a VTOL (vertical t ...
, and
Yakovlev Yak-141 The Yakovlev Yak-141 (russian: Яковлев Як-141; NATO reporting name "Freestyle"), also known as the Yak-41, is a Soviet supersonic vertical takeoff/landing (VTOL) fighter aircraft designed by Yakovlev. It was used for testing. Design ...
, were also taken into consideration. By contrast, Boeing's X-32 employed direct lift system that the augmented turbofan would be reconfigured to when engaging in STOVL operation. Lockheed Martin's commonality strategy was to replace the STOVL variant's SDLF with a fuel tank and the aft swivel nozzle with a two-dimensional thrust vectoring nozzle for the CTOL variant. This would enable identical aerodynamic configuration for the STOVL and CTOL variants, while the CV variant would have an enlarged wing to reduce landing speed for carrier recovery. Due to aerodynamic characteristics and carrier recovery requirements from the JAST merger, the design configuration settled on a conventional tail compared to the canard delta design from the ASTOVL/CALF; notably, the conventional tail configuration offers much lower risk for carrier recovery compared to the ASTOVL/CALF canard configuration, which was designed without carrier compatibility in mind. This enabled greater commonality between all three variants, as the commonality goal was important at this design stage. Lockheed Martin's prototypes would consist of the X-35A for demonstrating CTOL before converting it to the X-35B for STOVL demonstration and the larger-winged X-35C for CV compatibility demonstration. The X-35A first flew on 24 October 2000 and conducted flight tests for subsonic and supersonic flying qualities, handling, range, and maneuver performance. After 28 flights, the aircraft was then converted into the X-35B for STOVL testing, with key changes including the addition of the SDLF, the three-bearing swivel module (3BSM), and roll-control ducts. The X-35B would successfully demonstrate the SDLF system by performing stable hover, vertical landing, and short takeoff in less than . The X-35C first flew on 16 December 2000 and conducted field landing carrier practice tests. On 26 October 2001, Lockheed Martin was declared the winner and was awarded the System Development and Demonstration (SDD) contract;
Pratt & Whitney Pratt & Whitney is an American aerospace manufacturer with global service operations. It is a subsidiary of Raytheon Technologies. Pratt & Whitney's aircraft engines are widely used in both civil aviation (especially airlines) and military av ...
was separately awarded a development contract for the F135 engine for the JSF. The F-35 designation, which was out of sequence with standard DoD numbering, was allegedly determined on the spot by program manager Major General Mike Hough; this came as a surprise even to Lockheed Martin, which had expected the F-24 designation for the JSF.


Design and production

As the JSF program moved into the System Development and Demonstration phase, the X-35 demonstrator design was modified to create the F-35 combat aircraft. The forward fuselage was lengthened by to make room for mission avionics, while the horizontal stabilizers were moved aft to retain balance and control. The diverterless supersonic inlet changed from a four-sided to a three-sided cowl shape and was moved aft. The fuselage section was fuller, the top surface raised by along the centerline to accommodate weapons bays. Following the designation of the X-35 prototypes, the three variants were designated F-35A (CTOL), F-35B (STOVL), and F-35C (CV), all with a design service life of 8,000 hours. Prime contractor Lockheed Martin performs overall systems integration and final assembly and checkout (FACO) at
Fort Worth, Texas Fort Worth is the List of cities in Texas by population, fifth-largest city in the U.S. state of Texas and the List of United States cities by population, 13th-largest city in the United States. It is the county seat of Tarrant County, Texas, T ...
, while Northrop Grumman and
BAE Systems BAE Systems plc (BAE) is a British multinational arms, security, and aerospace company based in London, England. It is the largest defence contractor in Europe, and ranked the seventh-largest in the world based on applicable 2021 revenue ...
supply components for mission systems and airframe. Adding the systems of a fighter aircraft added weight. The F-35B gained the most, largely due to a 2003 decision to enlarge the weapons bays for commonality between variants; the total weight growth was reportedly up to , over 8%, causing all STOVL key performance parameter (KPP) thresholds to be missed.Keijsper 2007, p. 119 In December 2003, the STOVL Weight Attack Team (SWAT) was formed to reduce the weight increase; changes included thinned airframe members, smaller weapons bays and vertical stabilizers, less thrust fed to the roll-post outlets, and redesigning the wing-mate joint, electrical elements, and the airframe immediately aft of the cockpit. The inlet was also revised to accommodate more powerful, greater mass flow engines. Many changes from the SWAT effort were applied to all three variants for commonality. By September 2004, these efforts had reduced the F-35B's weight by over , while the F-35A and F-35C were reduced in weight by and respectively. The weight reduction work cost $6.2 billion and caused an 18-month delay. The first F-35A, designated AA-1, was rolled out at Fort Worth on 19 February 2006 and first flew on 15 December 2006. In 2006, the F-35 was given the name "Lightning II" after the
Lockheed P-38 Lightning The Lockheed P-38 Lightning is an American single-seat, twin piston-engined fighter aircraft that was used during World War II. Developed for the United States Army Air Corps by the Lockheed Corporation, the P-38 incorporated a distinctive tw ...
of World War II. Some USAF pilots have nicknamed the aircraft "Panther" instead. The aircraft's software was developed as six releases, or Blocks, for SDD. The first two Blocks, 1A and 1B, readied the F-35 for initial pilot training and multi-level security. Block 2A improved the training capabilities, while 2B was the first combat-ready release planned for the USMC's Initial Operating Capability (IOC). Block 3i retains the capabilities of 2B while having new hardware and was planned for the USAF's IOC. The final release for SDD, Block 3F, would have full flight envelope and all baseline combat capabilities. Alongside software releases, each block also incorporates avionics hardware updates and air vehicle improvements from flight and structural testing. In what is known as "concurrency", some
low rate initial production Low rate initial production (LRIP) is a term commonly used in military weapon projects/programs to designate the phase of initial, small-quantity production. The prospective first buyer and operator (i.e., a country's defense authorities and the r ...
(LRIP) aircraft lots would be delivered in early Block configurations and eventually upgraded to Block 3F once development is complete. After 17,000 flight test hours, the final flight for the SDD phase was completed in April 2018. Like the F-22, the F-35 has been targeted by cyberattacks and technology theft efforts, as well as potential vulnerabilities in the integrity of the supply chain. Testing found several major problems: early F-35B airframes had premature cracking, the F-35C arrestor hook design was unreliable, fuel tanks were too vulnerable to lightning strikes, the helmet display had problems, and more. Software was repeatedly delayed due to its unprecedented scope and complexity. In 2009, the DoD Joint Estimate Team (JET) estimated that the program was 30 months behind the public schedule. In 2011, the program was "re-baselined"; that is, its cost and schedule goals were changed, pushing the IOC from the planned 2010 to July 2015. The decision to simultaneously test, fix defects, and begin production was criticized as inefficient; in 2014,
Under Secretary of Defense for Acquisition The Under Secretary of Defense for Acquisition and Sustainment, or USD(A&S), is the Principal Staff Assistant (PSA) and advisor to the Secretary of Defense for all matters relating to acquisition and sustainment in the Department of Defense. Th ...
Frank Kendall Frank Kendall III (born January 26, 1949) is an American engineer, lawyer and executive who is the 26th and current United States Secretary of the Air Force. He has served in several senior positions in the U.S. Department of Defense. A West Poi ...
called it "acquisition malpractice". The three variants shared just 25% of their parts, far below the anticipated commonality of 70%. The program received considerable criticism for cost overruns and for the total projected lifetime cost, as well as quality management shortcomings by contractors. The JSF program was expected to cost about $200 billion for acquisition in base-year 2002 dollars when SDD was awarded in 2001. As early as 2005, the
Government Accountability Office The U.S. Government Accountability Office (GAO) is a legislative branch government agency that provides auditing, evaluative, and investigative services for the United States Congress. It is the supreme audit institution of the federal gover ...
(GAO) had identified major program risks in cost and schedule. The costly delays strained the relationship between the Pentagon and contractors. By 2017, delays and cost overruns had pushed the F-35 program's expected acquisition costs to $406.5 billion, with total lifetime cost (i.e., to 2070) to $1.5 trillion in then-year dollars which also includes operations and maintenance. The F-35A's unit cost for LRIP Lot 13 was $79.2 million. Delays in development and operational test and evaluation pushed full-rate production to 2023.


Upgrades and further development

The first combat-capable Block 2B configuration, which had basic air-to-air and strike capabilities, was declared ready by the USMC in July 2015. The Block 3F configuration began operational test and evaluation (OT&E) in December 2018, the completion of which will conclude SDD. The F-35 program is also conducting sustainment and upgrade development, with early LRIP aircraft gradually upgraded to the baseline Block 3F standard by 2021. The F-35 is expected to be continually upgraded over its lifetime. The first upgrade program, called Continuous Capability Development and Delivery (C2D2) began in 2019 and is currently planned to run to 2024. The near-term development priority of C2D2 is Block 4, which would integrate additional weapons, including those unique to international customers, refresh the avionics, improve ESM capabilities, and add Remotely Operated Video Enhanced Receiver (
ROVER Rover may refer to: People * Constance Rover (1910–2005), English historian * Jolanda de Rover (born 1963), Dutch swimmer * Rover Thomas (c. 1920–1998), Indigenous Australian artist Places * Rover, Arkansas, US * Rover, Missouri, US * ...
) support. C2D2 also places greater emphasis on agile software development to enable quicker releases. In 2018, the Air Force Life Cycle Management Center (AFLCMC) awarded contracts to General Electric and Pratt & Whitney to develop more powerful and efficient
adaptive cycle engine A variable cycle engine (VCE), also referred to as adaptive cycle engine (ACE), is an aircraft jet engine that is designed to operate efficiently under mixed flight conditions, such as subsonic, transonic and supersonic. The next generation of ...
s for potential application in the F-35, leveraging the research done under the Adaptive Engine Transition Program (AETP); in 2022, the F-35 Adaptive Engine Replacement (FAER) program was launched to integrate adaptive cycle engines into the aircraft by 2028. Defense contractors have offered upgrades to the F-35 outside of official program contracts. In 2013, Northrop Grumman disclosed its development of a directional infrared countermeasures suite, named Threat Nullification Defensive Resource (ThNDR). The countermeasure system would share the same space as the Distributed Aperture System (DAS) sensors and acts as a laser missile jammer to protect against infrared-homing missiles. Israel wants more access to the core avionics to include their own equipment. In September 2022, the F-35 delivery was temporarily suspended after determining Chinese sourced materials were used in
Honeywell Honeywell International Inc. is an American publicly traded, multinational conglomerate corporation headquartered in Charlotte, North Carolina. It primarily operates in four areas of business: aerospace, building technologies, performance ma ...
pumps.


Procurement and international participation

The United States is the primary customer and financial backer, with planned procurement of 1,763 F-35As for the USAF, 353 F-35Bs and 67 F-35Cs for the USMC, and 273 F-35Cs for the USN. Additionally, the United Kingdom, Italy, the Netherlands, Turkey, Australia, Norway, Denmark and Canada have agreed to contribute US$4.375 billion towards development costs, with the United Kingdom contributing about 10% of the planned development costs as the sole Tier 1 partner. The initial plan was that the U.S. and eight major partner countries would acquire over 3,100 F-35s through 2035. The three tiers of international participation generally reflect financial stake in the program, the amount of technology transfer and subcontracts open for bid by national companies, and the order in which countries can obtain production aircraft. Alongside program partner countries, Israel and Singapore have joined as Security Cooperative Participants (SCP). Sales to SCP and non-partner states, including Belgium, Japan, and South Korea, are made through the Pentagon's
Foreign Military Sales The United States Department of Defense's Foreign Military Sales (FMS) program facilitates sales of U.S. arms, defense equipment, defense services, and military training to foreign governments. The purchaser does not deal directly with the defense ...
program. Turkey was removed from the F-35 program in July 2019 over security concerns following its purchase of a Russian
S-400 The S-400 Triumf (russian: link=no, C-400 Триумф – Triumf; translation: Triumph; NATO reporting name: SA-21 Growler), previously known as the S-300 PMU-3, is a mobile, surface-to-air missile (SAM) system developed in the 1990s by Russ ...
surface-to-air missile system.


Design


Overview

The F-35 is a family of single-engine, supersonic, stealth multirole fighters. The second
fifth generation fighter A fifth-generation fighter is a jet fighter aircraft classification which includes major technologies developed during the first part of the 21st century. , these are the most advanced fighters in operation. The characteristics of a fifth-gene ...
to enter US service and the first operational supersonic STOVL stealth fighter, the F-35 emphasizes low observables, advanced avionics and sensor fusion that enable a high level of situational awareness and long range lethality; the USAF considers the aircraft its primary strike fighter for conducting suppression of enemy air defense (SEAD) missions, owing to the advanced sensors and mission systems. The F-35 has a wing-tail configuration with two vertical stabilizers canted for stealth. Flight control surfaces include leading-edge flaps, flaperons,
rudder A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, aircraft, or other vehicle that moves through a fluid medium (generally air or water). On an aircraft the rudder is used primarily to counter adve ...
s, and all-moving horizontal tails (
stabilator A stabilator is a fully movable aircraft horizontal stabilizer. It serves the usual functions of longitudinal stability, control and stick force requirements otherwise performed by the separate parts of a conventional horizontal stabilizer and e ...
s); leading edge root extensions also run forwards to the inlets. The relatively short 35-foot wingspan of the F-35A and F-35B is set by the requirement to fit inside USN amphibious assault ship parking areas and elevators; the F-35C's larger wing is more fuel efficient. The fixed diverterless supersonic inlets (DSI) use a bumped compression surface and forward-swept cowl to shed the boundary layer of the forebody away from the inlets, which form a Y-duct for the engine. Structurally, the F-35 drew upon lessons from the F-22; composites comprise 35% of airframe weight, with the majority being bismaleimide and
composite epoxy material Composite epoxy materials (CEM) are a group of composite materials typically made from woven glass fabric surfaces and non-woven glass core combined with epoxy synthetic resin. They are typically used in printed circuit boards. There are differen ...
s as well as some
carbon nanotube A scanning tunneling microscopy image of a single-walled carbon nanotube Rotating single-walled zigzag carbon nanotube A carbon nanotube (CNT) is a tube made of carbon with diameters typically measured in nanometers. ''Single-wall carbon na ...
-reinforced
epoxy Epoxy is the family of basic components or cured end products of epoxy resins. Epoxy resins, also known as polyepoxides, are a class of reactive prepolymers and polymers which contain epoxide groups. The epoxide functional group is also co ...
in later production lots. The F-35 is considerably heavier than the lightweight fighters it replaces, with the lightest variant having an empty weight of ; much of the weight can be attributed to the internal weapons bays and the extensive avionics carried. While lacking the raw performance of the larger twin-engine F-22, the F-35 has kinematics competitive with fourth generation fighters such as the F-16 and F/A-18, especially with ordnance mounted because the F-35's internal weapons carriage eliminates parasitic drag from external stores. All variants have a top speed of Mach 1.6, attainable with full internal payload. The powerful F135 engine gives good subsonic acceleration and energy, with supersonic dash in afterburner. The large stabilitors, leading edge extensions and flaps, and canted rudders provide excellent high alpha (
angle-of-attack In fluid dynamics, angle of attack (AOA, α, or \alpha) is the angle between a reference line on a body (often the chord line of an airfoil) and the vector representing the relative motion between the body and the fluid through which it is mo ...
) characteristics, with a trimmed alpha of 50°.
Relaxed stability In aviation, relaxed stability refers to an aircraft with low or negative stability. An aircraft with negative stability will have a tendency to change its pitch and bank angles spontaneously. An aircraft with negative stability cannot be trim ...
and
fly-by-wire Fly-by-wire (FBW) is a system that replaces the conventional manual flight controls of an aircraft with an electronic interface. The movements of flight controls are converted to electronic signals transmitted by wires, and flight control ...
controls provide excellent handling qualities and
departure resistance Departure resistance is a quality of an aircraft which enables it to remain in controlled flight and resist entering potentially dangerous less-controlled maneuvers such as spin. Depending on its design, an aircraft may be more or less likely to ...
. Having over double the F-16's internal fuel, the F-35 has a considerably greater
combat radius Radius of action, combat radius, or combat range in military terms, refers to the maximum distance a ship, aircraft, or vehicle can travel away from its base along a given course with normal load and return without refueling, allowing for all safet ...
, while stealth also enables a more efficient mission flight profile.


Sensors and avionics

The F-35's mission systems are among the most complex aspects of the aircraft. The avionics and sensor fusion are designed to enhance the pilot's
situational awareness Situational awareness or situation awareness (SA) is the perception of environmental elements and events with respect to time or space, the comprehension of their meaning, and the projection of their future status. An alternative definition is tha ...
and
command and control Command and control (abbr. C2) is a "set of organizational and technical attributes and processes ... hatemploys human, physical, and information resources to solve problems and accomplish missions" to achieve the goals of an organization o ...
capabilities and facilitate network-centric warfare. Key sensors include the
Northrop Grumman Northrop Grumman Corporation is an American multinational aerospace and defense technology company. With 90,000 employees and an annual revenue in excess of $30 billion, it is one of the world's largest weapons manufacturers and military tech ...
AN/APG-81
active electronically scanned array An active electronically scanned array (AESA) is a type of phased array antenna, which is a computer-controlled array antenna in which the beam of radio waves can be electronically steered to point in different directions without moving the an ...
(AESA) radar,
BAE Systems BAE Systems plc (BAE) is a British multinational arms, security, and aerospace company based in London, England. It is the largest defence contractor in Europe, and ranked the seventh-largest in the world based on applicable 2021 revenue ...
AN/ASQ-239 Barracuda electronic warfare system, Northrop Grumman/ Raytheon
AN/AAQ-37 The AN/AAQ-37 Electro-optical Distributed Aperture System (DAS) is the first of a new generation of sensor systems being fielded on the Lockheed Martin F-35 Lightning II The Lockheed Martin F-35 Lightning II is an American family of sing ...
Distributed Aperture System (DAS), Lockheed Martin AN/AAQ-40 Electro-Optical Targeting System (EOTS) and Northrop Grumman AN/ASQ-242 Communications, Navigation, and Identification (CNI) suite. The F-35 was designed with sensor intercommunication to provide a cohesive image of the local battlespace and availability for any possible use and combination with one another; for example, the APG-81 radar also acts as a part of the electronic warfare system. Much of the F-35's software was developed in C and C++
programming language A programming language is a system of notation for writing computer programs. Most programming languages are text-based formal languages, but they may also be graphical. They are a kind of computer language. The description of a programming ...
s, while Ada83 code from the F-22 was also used; the Block 3F software has 8.6 million lines of code. The Green Hills Software Integrity DO-178B real-time operating system (RTOS) runs on integrated core processors (ICPs); data networking includes the IEEE 1394b and
Fibre Channel Fibre Channel (FC) is a high-speed data transfer protocol providing in-order, lossless delivery of raw block data. Fibre Channel is primarily used to connect computer data storage to servers in storage area networks (SAN) in commercial data cen ...
buses. To enable fleet software upgrades for the software-defined radio systems and greater upgrade flexibility and affordability, the avionics leverage
commercial off-the-shelf Commercial off-the-shelf or commercially available off-the-shelf (COTS) products are packaged or canned (ready-made) hardware or software, which are adapted aftermarket to the needs of the purchasing organization, rather than the commissioning of ...
(COTS) components when practical. The mission systems software, particularly for sensor fusion, was one of the program's most difficult parts and responsible for substantial program delays. The APG-81 radar uses electronic scanning for rapid beam agility and incorporates passive and active air-to-air modes, strike modes, and synthetic aperture radar (SAR) capability, with multiple target track-while-scan at ranges in excess of . The antenna is tilted backwards for stealth. Complementing the radar is the AAQ-37 DAS, which consists of six
infrared sensors Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around ...
that provide all-aspect missile launch warning and target tracking; the DAS acts as a situational awareness infrared search-and-track (SAIRST) and gives the pilot spherical infrared and night-vision imagery on the helmet visor. The ASQ-239 Barracuda electronic warfare system has ten
radio frequency Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around to around . This is roughly between the up ...
antennas embedded into the edges of the wing and tail for all-aspect
radar warning receiver Radar warning receiver (RWR) systems detect the radio emissions of radar systems. Their primary purpose is to issue a warning when a radar signal that might be a threat is detected, like a fighter aircraft's fire control radar. The warning can ...
(RWR). It also provides sensor fusion of radio frequency and infrared tracking functions, geolocation threat targeting, and multispectral image countermeasures for self-defense against missiles. The electronic warfare system is capable of detecting and jamming hostile radars. The AAQ-40 EOTS is mounted internally behind a faceted low-observable window under the nose and performs laser targeting, forward-looking infrared (FLIR), and long range IRST functions. The ASQ-242 CNI suite uses a half dozen different physical links, including the directional
Multifunction Advanced Data Link Multifunction Advanced Data Link (MADL) is a fast switching narrow directional communications data link between stealth aircraft. It began as a method to coordinate between F-35 aircraft (the Joint Strike Fighter), but HQ Air Combat Command wants ...
(MADL), for covert CNI functions. Through sensor fusion, information from radio frequency receivers and infrared sensors are combined to form a single tactical picture for the pilot. The all-aspect target direction and identification can be shared via MADL to other platforms without compromising low observability, while Link 16 is present for communication with legacy systems. The F-35 was designed from the outset to incorporate improved processors, sensors, and software enhancements over its lifespan. Technology Refresh 3, which includes a new core processor and a new cockpit display, is planned for Lot 15 aircraft. Lockheed Martin has offered the Advanced EOTS for the Block 4 configuration; the improved sensor fits into the same area as the baseline EOTS with minimal changes. In June 2018, Lockheed Martin picked Raytheon for improved DAS. The USAF has studied the potential for the F-35 to orchestrate attacks by
unmanned combat aerial vehicle An unmanned combat aerial vehicle (UCAV), also known as a combat drone, colloquially shortened as drone or battlefield UAV, is an unmanned aerial vehicle (UAV) that is used for intelligence, surveillance, target acquisition, and reconnaissance ...
s (UCAVs) via its sensors and communications equipment.


Stealth and signatures

Stealth is a key aspect of the F-35's design, and
radar cross-section Radar cross-section (RCS), also called radar signature, is a measure of how detectable an object is by radar. A larger RCS indicates that an object is more easily detected. An object reflects a limited amount of radar energy back to the source. ...
(RCS) is minimized through careful shaping of the airframe and the use of
radar-absorbent material In materials science, radiation-absorbent material, usually known as RAM, is a material which has been specially designed and shaped to absorb incident RF radiation (also known as non-ionising radiation), as effectively as possible, from as ma ...
s (RAM); visible measures to reduce RCS include alignment of edges, serration of skin panels, and the masking of the engine face and turbine. Additionally, the F-35's diverterless supersonic inlet (DSI) uses a compression bump and forward-swept cowl rather than a splitter gap or bleed system to divert the boundary layer away from the inlet duct, eliminating the diverter cavity and further reducing radar signature. The RCS of the F-35 has been characterized as lower than a metal golf ball at certain frequencies and angles; in some conditions, the F-35 compares favorably to the F-22 in stealth. For maintainability, the F-35's stealth design took lessons learned from prior stealth aircraft such as the F-22; the F-35's radar-absorbent fibermat skin is more durable and requires less maintenance than older topcoats. The aircraft also has reduced
infrared Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of Light, visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from ...
and visual signatures as well as strict controls of radio frequency emitters to prevent their detection. The F-35's stealth design is primarily focused on high-frequency X-band wavelengths;
low-frequency radar Low-frequency radar is radar which uses frequencies lower than 1 GHz such as L-band, UHF, VHF, and HF, as opposed to the usual radar bands, which range from 2 GHz to 40 GHz.The radar cross section of any target depends on the freque ...
s can spot stealthy aircraft due to Rayleigh scattering, but such radars are also conspicuous, susceptible to clutter, and lack precision. To disguise its RCS, the aircraft can mount four
Luneburg lens A Luneburg lens (original German ''Lüneburg lens'', sometimes incorrectly spelled ''Luneberg lens'') is a spherically symmetric gradient-index lens. A typical Luneburg lens's refractive index ''n'' decreases radially from the center to the outer ...
reflectors. Noise from the F-35 caused concerns in residential areas near potential bases for the aircraft, and residents near two such bases— Luke Air Force Base, Arizona, and
Eglin Air Force Base Eglin Air Force Base is a United States Air Force (USAF) base in the western Florida Panhandle, located about southwest of Valparaiso in Okaloosa County. The host unit at Eglin is the 96th Test Wing (formerly the 96th Air Base Wing). The 9 ...
(AFB), Florida—requested environmental impact studies in 2008 and 2009 respectively. Although the noise level in decibels were comparable to those of prior fighters such as the F-16, the sound power of the F-35 is stronger particularly at lower frequencies. Subsequent surveys and studies have indicated that the noise of the F-35 was not perceptibly different from the F-16 and F/A-18E/F, though the greater low-frequency noise was noticeable for some observers.


Cockpit

The glass cockpit was designed to give the pilot good situational awareness. The main display is a 20- by 8-inch (50 by 20 cm) panoramic
touchscreen A touchscreen or touch screen is the assembly of both an input ('touch panel') and output ('display') device. The touch panel is normally layered on the top of an electronic visual display of an information processing system. The display is ofte ...
, which shows flight instruments, stores management, CNI information, and integrated caution and warnings; the pilot can customize the arrangement of the information. Below the main display is a smaller stand-by display. The cockpit has a speech-recognition system developed by Adacel. The F-35 does not have a head-up display; instead, flight and combat information is displayed on the visor of the pilot's helmet in a helmet-mounted display system (HMDS). The one-piece tinted canopy is hinged at the front and has an internal frame for structural strength. The Martin-Baker US16E
ejection seat In aircraft, an ejection seat or ejector seat is a system designed to rescue the pilot or other crew of an aircraft (usually military) in an emergency. In most designs, the seat is propelled out of the aircraft by an explosive charge or rock ...
is launched by a twin-catapult system housed on side rails. There is a right-hand side stick and throttle hands-on throttle-and-stick system. For life support, an onboard oxygen-generation system (OBOGS) is fitted and powered by the Integrated Power Package (IPP), with an auxiliary oxygen bottle and backup oxygen system for emergencies. The Vision Systems International helmet display is a key piece of the F-35's human-machine interface. Instead of the head-up display mounted atop the dashboard of earlier fighters, the HMDS puts flight and combat information on the helmet visor, allowing the pilot to see it no matter which way they are facing. Infrared and night vision imagery from the Distributed Aperture System can be displayed directly on the HMDS and enables the pilot to "see through" the aircraft. The HMDS allows an F-35 pilot to fire missiles at targets even when the nose of the aircraft is pointing elsewhere by cuing missile seekers at high angles off-boresight. Each helmet costs $400,000. The HMDS weighs more than traditional helmets, and there is concern that it can endanger lightweight pilots during ejection. Due to the HMDS's vibration, jitter, night-vision and sensor display problems during development, Lockheed Martin and Elbit issued a draft specification in 2011 for an alternative HMDS based on the AN/AVS-9
night vision Night vision is the ability to see in low-light conditions, either naturally with scotopic vision or through a night-vision device. Night vision requires both sufficient spectral range and sufficient intensity range. Humans have poor night v ...
goggles as backup, with BAE Systems chosen later that year. A cockpit redesign would be needed to adopt an alternative HMDS. Following progress on the baseline helmet, development on the alternative HMDS was halted in October 2013. In 2016, the Gen 3 helmet with improved night vision camera, new liquid crystal displays, automated alignment and software enhancements was introduced with LRIP lot 7.


Armament

To preserve its stealth shaping, the F-35 has two internal weapons bays with four weapons stations. The two outboard weapon stations each can carry ordnance up to , or for the F-35B, while the two inboard stations carry air-to-air missiles. Air-to-surface weapons for the outboard station include the
Joint Direct Attack Munition The Joint Direct Attack Munition (JDAM) is a guidance kit that converts unguided bombs, or "dumb bombs", into all-weather precision-guided munitions. JDAM-equipped bombs are guided by an integrated inertial guidance system coupled to a Global Po ...
(JDAM), Paveway series of bombs, Joint Standoff Weapon (JSOW), and
cluster munition A cluster munition is a form of air-dropped or ground-launched explosive weapon that releases or ejects smaller submunitions. Commonly, this is a cluster bomb that ejects explosive bomblets that are designed to kill personnel and destroy vehic ...
s ( Wind Corrected Munitions Dispenser). The station can also carry multiple smaller munitions such as the GBU-39 Small Diameter Bombs (SDB), GBU-53/B SDB II, and SPEAR 3
anti-tank missile An anti-tank guided missile (ATGM), anti-tank missile, anti-tank guided weapon (ATGW) or anti-armor guided weapon is a guided missile primarily designed to hit and destroy heavily armored military vehicles. ATGMs range in size from shoulder ...
s; up to four SDBs can be carried per station for the F-35A and F-35C, and three for the F-35B. The inboard station can carry the
AIM-120 AMRAAM The AIM-120 Advanced Medium-Range Air-to-Air Missile, or AMRAAM (pronounced ), is an American beyond-visual-range air-to-air missile (BVRAAM) capable of all-weather day-and-night operations. It is 7 inches (18 cm) in diameter, and employ ...
. Two compartments behind the weapons bays contain flares,
chaff Chaff (; ) is the dry, scaly protective casing of the seeds of cereal grains or similar fine, dry, scaly plant material (such as scaly parts of flowers or finely chopped straw). Chaff is indigestible by humans, but livestock can eat it. In agri ...
, and towed decoys. The aircraft can use six external weapons stations for missions that do not require stealth. The wingtip pylons each can carry an AIM-9X or AIM-132 ASRAAM and are canted outwards to reduce their radar cross-section. Additionally, each wing has a inboard station and a middle station, or for F-35B. The external wing stations can carry large air-to-surface weapons that would not fit inside the weapons bays such as the AGM-158 Joint Air to Surface Standoff Missile (JASSM) cruise missile. An air-to-air missile load of eight AIM-120s and two AIM-9s is possible using internal and external weapons stations; a configuration of six bombs, two AIM-120s and two AIM-9s can also be arranged. The F-35A is armed with a 25 mm GAU-22/A rotary cannon mounted internally near the left wing root with 182 rounds carried; the gun is more effective against ground targets than the 20 mm cannon carried by other USAF fighters. The F-35B and F-35C have no internal gun and instead can use a
Terma A/S Terma A/S is a Danish weapon and aerospace manufacturer for both civilian and military applications, and is owned by the Danish company Thrige Holding A/S. It is Denmark's largest company within the aerospace and weapon industry, employing approx ...
multi-mission pod (MMP) carrying the GAU-22/A and 220 rounds; the pod is mounted on the centerline of the aircraft and shaped to reduce its radar cross-section. In lieu of the gun, the pod can also be used for different equipment and purposes, such as
electronic warfare Electronic warfare (EW) is any action involving the use of the electromagnetic spectrum (EM spectrum) or directed energy to control the spectrum, attack an enemy, or impede enemy assaults. The purpose of electronic warfare is to deny the opponent ...
,
aerial reconnaissance Aerial reconnaissance is reconnaissance for a military or strategic purpose that is conducted using reconnaissance aircraft. The role of reconnaissance can fulfil a variety of requirements including artillery spotting, the collection of im ...
, or rear-facing tactical radar. Lockheed Martin is developing a weapon rack called Sidekick that would enable the internal outboard station to carry two AIM-120s, thus increasing the internal air-to-air payload to six missiles, currently offered for Block 4.Lake 2010, pp. 37–45. Block 4 will also have a rearranged hydraulic line and bracket to allow the F-35B to carry four SDBs per internal outboard station; integration of the MBDA
Meteor A meteoroid () is a small rocky or metallic body in outer space. Meteoroids are defined as objects significantly smaller than asteroids, ranging in size from grains to objects up to a meter wide. Objects smaller than this are classified as mi ...
is also planned. The USAF and USN are planning to integrate the AGM-88G AARGM-ER internally in the F-35A and F-35C. Norway and Australia are funding an adaptation of the Naval Strike Missile (NSM) for the F-35; designated Joint Strike Missile (JSM), two missiles can be carried internally with an additional four externally. Nuclear weapons delivery via internal carriage of the B61 nuclear bomb is planned for Block 4B in 2024. Both hypersonic missiles and direct energy weapons such as solid-state laser are currently being considered as future upgrades. Lockheed Martin is studying integrating a
fiber laser A fiber laser (or fibre laser in British English) is a laser in which the active gain medium is an optical fiber doped with rare-earth elements such as erbium, ytterbium, neodymium, dysprosium, praseodymium, thulium and holmium. They are rela ...
that uses spectral beam combining multiple individual laser modules into a single high-power beam, which can be scaled to various levels. The USAF plans for the F-35A to take up the
close air support In military tactics, close air support (CAS) is defined as air action such as air strikes by fixed or rotary-winged aircraft against hostile targets near friendly forces and require detailed integration of each air mission with fire and movemen ...
(CAS) mission in contested environments; amid criticism that it is not as well suited as a dedicated attack platform, USAF chief of staff
Mark Welsh Mark Anthony Welsh III (born January 26, 1953) is Dean of the Bush School of Government and Public Service at Texas A&M University and a retired United States Air Force four-star general. Prior to his current role, he served as Chief of Staff of ...
placed a focus on weapons for CAS sorties, including guided rockets, fragmentation rockets that shatter into individual projectiles before impact, and more compact ammunition for higher capacity gun pods. Fragmentary rocket warheads create greater effects than cannon shells as each rocket creates a "thousand-round burst", delivering more projectiles than a strafing run.


Engine

The single-engine aircraft is powered by the Pratt & Whitney F135 low-bypass augmented turbofan with rated thrust of . Derived from the Pratt & Whitney F119 used by the F-22, the F135 has a larger fan and higher bypass ratio to increase subsonic thrust and
fuel efficiency Fuel efficiency is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work. Overall fuel efficiency may vary per device ...
, and unlike the F119, is not optimized for supercruise. The engine contributes to the F-35's stealth by having a low-observable augmenter, or
afterburner An afterburner (or reheat in British English) is an additional combustion component used on some jet engines, mostly those on military supersonic aircraft. Its purpose is to increase thrust, usually for supersonic flight, takeoff, and c ...
, that incorporates fuel injectors into thick curved vanes; these vanes are covered by ceramic radar-absorbent materials and mask the turbine. The stealthy augmenter had problems with pressure pulsations, or "screech", at low altitude and high speed early in its development. The low-observable axisymmetric nozzle consists of 15 partially overlapping flaps that create a sawtooth pattern at the trailing edge, which reduces radar signature and creates shed vortices that reduce the infrared signature of the exhaust plume. Due to the engine's large dimensions, the USN had to modify its underway replenishment system to facilitate at-sea logistics support. The F-35's Integrated Power Package (IPP) performs power and thermal management and integrates environment control, auxiliary power unit, engine starting, and other functions into a single system. The F135-PW-600 variant for the F-35B incorporates the Shaft-Driven Lift Fan (SDLF) to allow STOVL operations. Designed by Lockheed Martin and developed by Rolls-Royce, the SDLF, also known as the
Rolls-Royce LiftSystem The Rolls-Royce LiftSystem, together with the F135 engine, is an aircraft propulsion system designed for use in the STOVL variant of the F-35 Lightning II. The complete system, known as the Integrated Lift Fan Propulsion System (ILFPS), was a ...
, consists of the lift fan, drive shaft, two roll posts, and a "three-bearing swivel module" (3BSM). The
thrust vectoring Thrust vectoring, also known as thrust vector control (TVC), is the ability of an aircraft, rocket, or other vehicle to manipulate the direction of the thrust from its engine(s) or motor(s) to control the attitude or angular velocity of the ve ...
3BSM nozzle allows the main engine exhaust to be deflected downward at the tail of the aircraft and is moved by a "fueldraulic" actuator that uses pressurized fuel as the
working fluid For fluid power, a working fluid is a gas or liquid that primarily transfers force, motion, or mechanical energy. In hydraulics, water or hydraulic fluid transfers force between hydraulic components such as hydraulic pumps, hydraulic cylinders, a ...
. Unlike the Harrier's
Pegasus Pegasus ( grc-gre, Πήγασος, Pḗgasos; la, Pegasus, Pegasos) is one of the best known creatures in Greek mythology. He is a winged divine stallion usually depicted as pure white in color. He was sired by Poseidon, in his role as hor ...
engine that entirely uses direct engine thrust for lift, the F-35B's system augments the swivel nozzle's thrust with the lift fan; the fan is powered by the low-pressure turbine through a drive shaft when engaged with a clutch and placed near the front of the aircraft to provide a counterbalancing thrust. Roll control during slow flight is achieved by diverting unheated engine bypass air through wing-mounted thrust nozzles called roll posts. An alternative engine, the General Electric/Rolls-Royce F136, was being developed in the 2000s; originally, F-35 engines from Lot 6 onward were competitively tendered. Using technology from the General Electric YF120, the F136 was claimed to have a greater temperature margin than the F135 due to the higher mass flow design making full use of the inlet. The F136 was canceled in December 2011 due to lack of funding. The F-35 is expected to receive propulsion upgrades over its lifecycle to adapt to emerging threats and enable additional capabilities. In 2016, the Adaptive Engine Transition Program (AETP) was launched to develop and test adaptive cycle engines, with one major potential application being the re-engining of the F-35; in 2018, both GE and P&W were awarded contracts to develop thrust class demonstrators, with the designations
XA100 The General Electric XA100 is an American adaptive cycle engine demonstrator being developed by General Electric (GE) for the Lockheed Martin F-35 Lightning II and form the basis for the propulsion system for the United States Air Force's sixth ...
and XA101 respectively. In addition to potential re-engining, P&W also plans to improve the baseline F135; in 2017, P&W announced the F135 Growth Option 1.0 and 2.0; Growth Option 1.0 was a drop-in power module upgrade that offered 6–10% thrust improvement and 5–6% fuel burn reduction, while Growth Option 2.0 would be the adaptive cycle XA101. In 2020, P&W shifted its F135 upgrade plan from the Growth Options to a series of Engine Enhancement Packages along with some additional capabilities, while the XA101 became a separate clean-sheet design. The capability packages are planned to be incorporated in two-year increments starting in the mid-2020s. In December 2020, GE's XA100 (A100) completed its first successful run. GE's detailed design was completed in February 2019, and initial testing at GE's high-altitude test facility in Evendale, Ohio was concluded in May 2021. GE expects that the A100 can enter service with the F-35A and C in 2027 at the earliest.


Maintenance and logistics

The F-35 is designed to require less maintenance than prior stealth aircraft. Some 95% of all field-replaceable parts are "one deep"—that is, nothing else need be removed to reach the desired part; for instance, the ejection seat can be replaced without removing the canopy. The F-35 has a fibermat radar-absorbent material (RAM) baked into the skin, which is more durable, easier to work with, and faster to cure than older RAM coatings; similar coatings are being considered for application on older stealth aircraft such as the F-22. Skin corrosion on the F-22 led the F-35 using a less galvanic corrosion-inducing skin gap filler, fewer gaps in the airframe skin needing filler, and better drainage. The flight control system uses electro-hydrostatic actuators rather than traditional hydraulic systems; these controls can be powered by lithium-ion batteries in case of emergency. Commonality between variants led to the USMC's first aircraft maintenance Field Training Detachment, which applied USAF lessons to their F-35 operations. The F-35 was initially supported by a computerized maintenance management system named Autonomic Logistics Information System (ALIS). In concept, any F-35 can be serviced at any maintenance facility and all parts can be globally tracked and shared as needed. Due to numerous problems, such as unreliable diagnoses, excessive connectivity requirements, and security vulnerabilities, ALIS is being replaced by the cloud-based Operational Data Integrated Network (ODIN). From September 2020, ODIN base kits (OBKs) were running ALIS software, as well as ODIN software, first at Marine Corps Air Station (MCAS) Yuma, Arizona, then at Naval Air Station Lemoore, California, in support of Strike Fighter Squadron (VFA) 125 on 16 July 2021, and then Nellis Air Force Base, Nevada, in support of the 422nd Test and Evaluation Squadron (TES) on 6 August 2021. In 2022, over a dozen more OBK sites will replace the ALIS's Standard Operating Unit unclassified (SOU-U) servers. OBK performance is double that of ALIS.Michael Land F-35 Patuxent River ITF (29 Jul 2021) F-35 testers recommend fielding logistics software update
picture of OBK (two 100-pound suitcase sized racks)


Operational history


Testing

The first F-35A, AA-1, conducted its engine run in September 2006 and first flew on 15 December 2006. Unlike all subsequent aircraft, AA-1 did not have the weight optimization from SWAT; consequently, it mainly tested subsystems common to subsequent aircraft, such as the propulsion, electrical system, and cockpit displays. This aircraft was retired from flight testing in December 2009 and was used for live-fire testing at NAS China Lake. The first F-35B, BF-1, flew on 11 June 2008, while the first weight-optimized F-35A and F-35C, AF-1 and CF-1, flew on 14 November 2009 and 6 June 2010 respectively. The F-35B's first hover was on 17 March 2010, followed by its first vertical landing the next day. The F-35 Integrated Test Force (ITF) consisted of 18 aircraft at
Edwards Air Force Base Edwards Air Force Base (AFB) is a United States Air Force installation in California. Most of the base sits in Kern County, but its eastern end is in San Bernardino County and a southern arm is in Los Angeles County. The hub of the base is ...
and Naval Air Station Patuxent River. Nine aircraft at Edwards, five F-35As, three F-35Bs, and one F-35C, performed flight sciences testing such as F-35A
envelope An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a ...
expansion, flight loads, stores separation, as well as mission systems testing. The other nine aircraft at Patuxent River, five F-35Bs and four F-35Cs, were responsible for F-35B and C envelope expansion and STOVL and CV suitability testing. Additional carrier suitability testing was conducted at Naval Air Warfare Center Aircraft Division at
Lakehurst, New Jersey Lakehurst is a borough in Ocean County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 2,654, For testing avionics and mission systems, a modified Boeing 737-300 with a duplication of the cockpit, the Lockheed Martin CATBird has been used. Field testing of the F-35's sensors were conducted during
Exercise Northern Edge Exercise Northern Edge is Alaska's premier military joint training exercise. Alaskan Command (ALCOM) uses expansive Alaskan training ranges to conduct this joint training operation. History Jack Frost (1975-1979) Northern Edge evolved ove ...
2009 and 2011, serving as significant risk-reduction steps. Flight tests revealed several serious deficiencies that required costly redesigns, caused delays, and resulted in several fleet-wide groundings. In 2011, the F-35C failed to catch the arresting wire in all eight landing tests; a redesigned tail hook was delivered two years later. By June 2009, many of the initial flight test targets had been accomplished but the program was behind schedule. Software and mission systems were among the biggest sources of delays for the program, with sensor fusion proving especially challenging. In fatigue testing, the F-35B suffered several premature cracks, requiring a redesign of the structure. A third non-flying F-35B is currently planned to test the redesigned structure. The F-35B and C also had problems with the horizontal tails suffering heat damage from prolonged afterburner use. Early flight control laws had problems with "wing drop" and also made the airplane sluggish, with high angles-of-attack tests in 2015 against an F-16 showing a lack of energy. At-sea testing of the F-35B was first conducted aboard . In October 2011, two F-35Bs conducted three weeks of initial sea trials, called Development Test I. The second F-35B sea trials, Development Test II, began in August 2013, with tests including nighttime operations; two aircraft completed 19 nighttime vertical landings using DAS imagery. The first operational testing involving six F-35Bs was done on the ''Wasp'' in May 2015. The final Development Test III on involving operations in high sea states was completed in late 2016. A Royal Navy F-35 conducted the first "rolling" landing on board in October 2018. After the redesigned tail hook arrived, the F-35C's carrier-based Development Test I began in November 2014 aboard and focused on basic day carrier operations and establishing launch and recovery handling procedures. Development Test II, which focused on night operations, weapons loading, and full power launches, took place in October 2015. The final Development Test III was completed in August 2016, and included tests of asymmetric loads and certifying systems for landing qualifications and interoperability. Operational test of the F-35C began in 2018. The F-35's reliability and availability have fallen short of requirements, especially in the early years of testing. The ALIS maintenance and logistics system was plagued by excessive connectivity requirements and faulty diagnoses. In late 2017, the GAO reported the time needed to repair an F-35 part averaged 172 days, which was "twice the program's objective," and that shortage of spare parts was degrading readiness. In 2019, while individual F-35 units have achieved mission-capable rates of over the target of 80% for short periods during deployed operations, fleet-wide rates remained below target. The fleet availability goal of 65% was also not met, although the trend shows improvement. Gun accuracy of the F-35A remains unacceptable. As of 2020, the number of the program's most serious issues have been decreased by half. Operational test and evaluation (OT&E) with Block 3F, the final configuration for SDD, began in December 2018.


United States


Training

The F-35A and F-35B were cleared for basic flight training in early 2012, although there were concerns over safety and performance due to lack of system maturity at the time. During the Low Rate Initial Production (LRIP) phase, the three U.S. military services jointly developed tactics and procedures using flight simulators, testing effectiveness, discovering problems and refining design. On 10 September 2012, the USAF began an operational utility evaluation (OUE) of the F-35A, including logistical support, maintenance, personnel training, and pilot execution. The USMC F-35B Fleet Replacement Squadron (FRS) was initially based at Eglin AFB in 2012 alongside USAF F-35A training units, before moving to
MCAS Beaufort Marine Corps Air Station Beaufort or MCAS Beaufort is a United States Marine Corps (USMC) air base located northwest of the central business district of Beaufort, a city in Beaufort County, South Carolina, United States. About 4,700 personnel ...
in 2014 while another FRS was stood up at MCAS Miramar in 2020. The USAF F-35A basic course is held at Eglin AFB and Luke AFB; in January 2013, training began at Eglin with capacity for 100 pilots and 2,100 maintainers at once. Additionally, the
6th Weapons Squadron The 6th Weapons Squadron is an active United States Air Force unit. It is assigned to the USAF Weapons School, based at Nellis Air Force Base, Nevada. It was previously assigned to the Seventh Air Force, being inactivated at Yokota Airfield, ...
of the
USAF Weapons School The USAF Weapons School is a unit of the United States Air Force and United States Space Force, assigned to the 57th Wing and Space Delta 1. It is located at Nellis AFB, Nevada. Mission The mission of the USAF Weapons School is to teach gra ...
was activated at
Nellis AFB Nellis Air Force Base ("Nellis" colloq.) is a United States Air Force installation in southern Nevada. Nellis hosts air combat exercises such as Exercise Red Flag and close air support exercises such as Green Flag-West flown in " Military O ...
in June 2017 for F-35A weapons instructor curriculum while the
65th Aggressor Squadron The 65th Aggressor Squadron is a United States Air Force unit currently operating the F-35A Lightning II. It is assigned to the 57th Operations Group at Nellis Air Force Base, Nevada. Overview The 65th Aggressor Squadron currently flies the F ...
was reactivated with the F-35A in June 2022 to expand training against adversary stealth aircraft tactics. The USN stood up its F-35C FRS in 2012 with VFA-101 at Eglin AFB, but operations would later be transferred and consolidated under VFA-125 at NAS Lemoore in 2019. The F-35C was introduced to the Strike Fighter Tactics Instructor course, or TOPGUN, in 2020 and the additional capabilities of the aircraft greatly revamped the course syllabus.


U.S. Marine Corps

On 16 November 2012, the USMC received the first F-35B of
VMFA-121 Marine Fighter Attack Squadron 121 (VMFA-121), also known as the "Green Knights", is a United States Marine Corps aircraft squadron operating the F-35B Lightning II. The squadron is based at Marine Corps Air Station Iwakuni, Japan and falls under ...
at
MCAS Yuma Marine Corps Air Station Yuma or MCAS Yuma is a United States Marine Corps air station. It is the home of multiple squadrons of F-35B Lightning IIs of the 3rd Marine Aircraft Wing, Marine Aviation Weapons and Tactics Squadron 1 (MAWTS-1), Mari ...
. The USMC declared Initial Operational Capability (IOC) for the F-35B in the Block 2B configuration on 31 July 2015 after operational trials, with some limitations in night operations, mission systems, and weapons carriage. USMC F-35Bs participated in their first Red Flag exercise in July 2016 with 67 sorties conducted. The first F-35B deployment occurred in 2017 at MCAS Iwakuni, Japan; combat employment began in July 2018 from the amphibious assault ship , with the first combat strike on 27 September 2018 against a Taliban target in Afghanistan. In addition to deploying F-35Bs on amphibious assault ships, the USMC plans to disperse the aircraft among austere forward-deployed bases with shelter and concealment to enhance survivability while remaining close to a battlespace. Known as distributed STOVL operations (DSO), F-35Bs would operate from temporary bases in allied territory within hostile missile engagement zones and displace inside the enemy's 24- to 48-hour targeting cycle; this strategy allows F-35Bs to rapidly respond to operational needs, with mobile forward arming and refueling points (M-FARPs) accommodating KC-130 and MV-22 Osprey aircraft to rearm and refuel the jets, as well as littoral areas for sea links of mobile distribution sites. For higher echelons of maintenance, F-35Bs would return from M-FARPs to rear-area friendly bases or ships. Helicopter-portable metal planking is needed to protect unprepared roads from the F-35B's exhaust; the USMC are studying lighter heat-resistant options. These operations have become part of the larger USMC Expeditionary Advanced Base Operations (EABO) concept. The first USMC F-35C squadron, VMFA-314, achieved Full Operational Capability in July 2021 and was first deployed on board the USS ''Abraham Lincoln'' as a part of Carrier Air Wing 9 in January 2022.


U.S. Air Force

USAF F-35A in the Block 3i configuration achieved IOC with the USAF's 34th Fighter Squadron at
Hill Air Force Base Hill Air Force Base is a major U.S. Air Force (USAF) base located in northern Utah, just south of the city of Ogden, and bordering the Cities of Layton, Clearfield, Riverdale, Roy, and Sunset with its largest border immediately adjacent t ...
,
Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to its ...
on 2 August 2016. F-35As conducted their first Red Flag exercise in 2017; system maturity had improved and the aircraft scored a kill ratio of 15:1 against an F-16 aggressor squadron in a high-threat environment. The first USAF F-35A deployment occurred on 15 April 2019 to Al Dhafra Air Base, UAE. On 27 April 2019, USAF F-35As were first used in combat in an airstrike on an
Islamic State An Islamic state is a state that has a form of government based on Islamic law (sharia). As a term, it has been used to describe various historical polities and theories of governance in the Islamic world. As a translation of the Arabic ter ...
tunnel network in northern Iraq. For European basing, RAF Lakenheath in the UK was chosen as the first installation to station two F-35A squadrons, with 48 aircraft adding to the 48th Fighter Wing's existing F-15C and F-15E squadrons. The first aircraft of the 495th Fighter Squadron arrived in 15 December 2021. The F-35's operating cost is higher than some older USAF tactical aircraft. In fiscal year 2018, the F-35A's cost per flight hour (CPFH) was $44,000, a number that was reduced to $35,000 in 2019. For comparison, in 2015 the CPFH of the A-10 was $17,716; the F-15C, $41,921; and the F-16C, $22,514. Lockheed Martin hopes to reduce it to $25,000 by 2025 through performance-based logistics and other measures.


U.S. Navy

The USN achieved operational status with the F-35C in Block 3F on 28 February 2019. On 2 August 2021, the F-35C of
VFA-147 Strike Fighter Squadron 147 (VFA-147), also known as the "Argonauts," is a United States Navy strike fighter squadron based at Naval Air Station Lemoore, California (USA). VFA-147 was established on 1 February 1967 and flies the F-35C Lightning ...
, as well as the CMV-22 Osprey, embarked on their maiden deployments as part of Carrier Air Wing 2 on board the
USS Carl Vinson USS ''Carl Vinson'' (CVN-70) is the United States Navy's third supercarrier. She is named for Carl Vinson (1883-1981), a congressman from Georgia, in recognition of his contributions to the U.S. Navy. The ship was launched during Vinson's lifet ...
.


United Kingdom

The United Kingdom's Royal Air Force and Royal Navy both operate the F-35B, known simply as the Lightning in British service; it has replaced the Harrier GR9, which was retired in 2010, and Tornado GR4, which was retired in 2019. The F-35 is to be Britain's primary strike aircraft for the next three decades. One of the Royal Navy's requirements for the F-35B was a Shipborne Rolling and Vertical Landing (SRVL) mode to increase maximum landing weight by using wing lift during landing. When operating on the aircraft carriers HMS Queen Elizabeth (R08) and
HMS Prince of Wales (R09) HMS ''Prince of Wales'' (R09) is the second of the Royal Navy. Unlike most large aircraft carriers, ''Prince of Wales'' is not fitted with catapults and arrestor wires, and is instead designed to operate STOVL aircraft; the ship is currently ...
, British F-35Bs use
ski-jump Ski jumping is a winter sport in which competitors aim to achieve the farthest jump after sliding down on their skis from a specially designed curved ramp. Along with jump length, competitor's aerial style and other factors also affect the final ...
s. The Italian Navy use the same process. British F-35Bs are not intended to use the Brimstone 2 missile. In July 2013, Chief of the Air Staff, Air Chief Marshal
Sir Stephen Dalton Air Chief Marshal Sir Stephen Gary George Dalton, (born 23 April 1954)''Who's Who 2010'', A & C Black, 2010, is a retired Royal Air Force commander and former Lieutenant Governor of Jersey. As commanding officer of XIII Squadron, Dalton dep ...
announced that No. 617 (The Dambusters) Squadron would be the RAF's first operational F-35 squadron. The second operational squadron will be the
Fleet Air Arm The Fleet Air Arm (FAA) is one of the five fighting arms of the Royal Navy and is responsible for the delivery of naval air power both from land and at sea. The Fleet Air Arm operates the F-35 Lightning II for maritime strike, the AW159 Wi ...
's
809 Naval Air Squadron 809 Naval Air Squadron (809 NAS) is a squadron of the Fleet Air Arm of the United Kingdom. It was first formed in 1941 and flew in the Soviet Union, the Mediterranean and the Far East during the Second World War. After active service during the Su ...
which will stand up in April 2023 or later. No. 17 (Reserve) Test and Evaluation Squadron (TES) stood-up on 12 April 2013 as the
Operational Evaluation Unit An Operational Evaluation Unit is a type of "reserve" squadron of the Royal Air Force. OEU squadrons are tasked with evaluating an aircraft's weapons, systems and performance. This is to either assist in bringing the aircraft to an operational ca ...
for the Lightning, becoming the first British squadron to operate the type. By June 2013, the RAF had received three F-35s of the 48 on order, initially based at Eglin Air Force Base. In June 2015, the F-35B undertook its first launch from a ski-jump at NAS Patuxent River. On 5 July 2017, it was announced the second UK-based RAF squadron would be No. 207 Squadron, which reformed on 1 August 2019 as the Lightning Operational Conversion Unit. No. 617 Squadron reformed on 18 April 2018 during a ceremony in Washington, D.C., becoming the first RAF front-line squadron to operate the type; receiving its first four F-35Bs on 6 June, flying from MCAS Beaufort to
RAF Marham RAF Marham is a Royal Air Force station and military airbase near the village of Marham in the English county of Norfolk, East Anglia. It is home to No. 138 Expeditionary Air Wing (138 EAW) and, as such, is one of the RAF's "Main Operating Ba ...
. On 10 January 2019, No. 617 Squadron and its F-35s were declared combat ready. In April 2019, No. 617 Squadron deployed to
RAF Akrotiri RAF Akrotiri ( el, Βασιλική Πολεμική Αεροπορία Ακρωτηρίου) is a large Royal Air Force base on the Mediterranean island of Cyprus. It is located in the Western Sovereign Base Area, one of two areas which compri ...
,
Cyprus Cyprus ; tr, Kıbrıs (), officially the Republic of Cyprus,, , lit: Republic of Cyprus is an island country located south of the Anatolian Peninsula in the eastern Mediterranean Sea. Its continental position is disputed; while it is ...
, the type's first overseas deployment. On 25 June 2019, the first combat use of an RAF F-35B was reportedly undertaken as armed reconnaissance flights searching for Islamic State targets in Iraq and Syria. In October 2019, ''the Dambusters'' and No. 17 TES F-35s were embarked on HMS ''Queen Elizabeth'' for the first time. No. 617 Squadron departed RAF Marham on 22 January 2020 for their first Exercise Red Flag with the Lightning. As of November 2022, 26 F-35Bs were based in the United Kingdom (with 617 and 207 Squadrons) and a further three were permanently based in the United States (with 17 Squadron) for testing and evaluation purposes.


Australia

Australia's first F-35, designated A35-001, was manufactured in 2014, with flight training provided through international Pilot Training Centre (PTC) at Luke Air Force Base in Arizona. The first two F-35s were unveiled to the Australian public on 3 March 2017 at the
Avalon Airshow The Australian International Airshow, also called the Avalon Airshow, is a large air show held biennially at Avalon Airport, between Melbourne and Geelong in Victoria. The event has a strong focus on military aviation, featuring aircraft from ...
. By 2021, the
Royal Australian Air Force "Through Adversity to the Stars" , colours = , colours_label = , march = , mascot = , anniversaries = RAAF Anniversary Commemoration ...
had accepted 26 F-35As, with nine in the US and 17 operating at No 3 Squadron and No 2 Operational Conversion Unit at
RAAF Base Williamtown RAAF Base Williamtown is a Royal Australian Air Force (RAAF) military air base located north of the coastal city of Newcastle ( by road) in the local government area of Port Stephens, in New South Wales, Australia. The base serves as the ...
. With 41 trained RAAF pilots and 225 trained technicians for maintenance, the fleet was declared ready to deploy on operations. It is expected that Australia will receive all 72 F-35s by 2023.


Israel

The Israeli Air Force (IAF) declared the F-35 operationally capable on 6 December 2017. According to Kuwaiti newspaper ''Al Jarida'', in July 2018, a test mission of at least three IAF F-35s flew to Iran's capital
Tehran Tehran (; fa, تهران ) is the largest city in Tehran Province and the capital of Iran. With a population of around 9 million in the city and around 16 million in the larger metropolitan area of Greater Tehran, Tehran is the most popul ...
and back from
Tel Aviv Tel Aviv-Yafo ( he, תֵּל־אָבִיב-יָפוֹ, translit=Tēl-ʾĀvīv-Yāfō ; ar, تَلّ أَبِيب – يَافَا, translit=Tall ʾAbīb-Yāfā, links=no), often referred to as just Tel Aviv, is the most populous city in the G ...
. While publicly unconfirmed, regional leaders acted on the report; Iran's supreme leader
Ali Khamenei Sayyid Ali Hosseini Khamenei ( fa, سید علی حسینی خامنه‌ای, ; born 19 April 1939) is a Twelver Shia '' marja and the second and current Supreme Leader of Iran, in office since 1989. He was previously the third presiden ...
reportedly fired the air force chief and commander of Iran's Revolutionary Guard Corps over the mission. On 22 May 2018, IAF chief
Amikam Norkin Aluf Amikam Norkin ( he, עמיקם נורקין; born December 20, 1966) is an Israeli general, who served as commander of the Israeli Air Force from 2017 to 2022. Before his selection to succeed Amir Eshel as commander of the IAF, Norkin served ...
said that the service had employed their F-35Is in two attacks on two battle fronts, marking the first combat operation of an F-35 by any country. Norkin said it had been flown "all over the Middle East", and showed photos of an F-35I flying over
Beirut Beirut, french: Beyrouth is the capital and largest city of Lebanon. , Greater Beirut has a population of 2.5 million, which makes it the third-largest city in the Levant region. The city is situated on a peninsula at the midpoint o ...
in daylight. In July 2019, Israel expanded its strikes against Iranian missile shipments; IAF F-35Is allegedly struck Iranian targets in Iraq twice. In November 2020, the IAF announced the delivery of an F-35I Testbed aircraft amongst a delivery of four aircraft received in August. This example will be used to test and integrate Israeli-produced weapons and electronic systems on future F-35s received. This is the only example of a testbed F-35 delivered to an air force outside of the United States. On 11 May 2021, eight IAF F-35Is took part in an attack on 150 targets in Hamas' rocket array, including 50–70 launch pits in the northern
Gaza Strip The Gaza Strip (;The New Oxford Dictionary of English (1998) – p.761 "Gaza Strip /'gɑːzə/ a strip of territory under the control of the Palestinian National Authority and Hamas, on the SE Mediterranean coast including the town of Gaza.. ...
, as part of Operation Guardian of the Walls. On 6 March 2022, the IDF stated that on 15 March 2021, F-35Is shot down two Iranian
drone Drone most commonly refers to: * Drone (bee), a male bee, from an unfertilized egg * Unmanned aerial vehicle * Unmanned surface vehicle, watercraft * Unmanned underwater vehicle or underwater drone Drone, drones or The Drones may also refer to: ...
s carrying weapons to the
Gaza Strip The Gaza Strip (;The New Oxford Dictionary of English (1998) – p.761 "Gaza Strip /'gɑːzə/ a strip of territory under the control of the Palestinian National Authority and Hamas, on the SE Mediterranean coast including the town of Gaza.. ...
.Israel shot down Iranian drones en route to Gaza, IDF says
Ynet, 6 March 2022.
This was the first operational shoot down and interception carried out by the F-35.


Italy

Italy's F-35As were declared to have reached initial operational capability (IOC) on 30 November 2018. At the time Italy had taken delivery of 10 F-35As and one F-35B, with 2 F-35As and the one F-35B being stationed in the U.S. for training, the remaining 8 F-35As were stationed in Amendola.


Japan

Japan's F-35As were declared to have reached initial operational capability (IOC) on 29 March 2019. At the time Japan had taken delivery of 10 F-35As stationed in Misawa Air Base. Japan plans to eventually acquire a total of 147 F-35s, which will include 42 F-35Bs. It plans to use the latter variant to equip Japan’s
Izumo-class multi-purpose destroyer The or 22DDH are aircraft carriers (originally helicopter carriers) in service with the Japan Maritime Self-Defense Force (JMSDF). The class is designated as a multi-purpose operation destroyer by the Japanese government due to limits on the ...
.


Norway

On 6 November 2019 Norway declared initial operational capability (IOC) for its fleet of 15 F-35As out of a planned 52 F-35As. On 6 January 2022 Norway's F-35As replaced its F-16s for the NATO quick reaction alert mission in the high north.


Netherlands

On 27 December 2021 the Netherlands declared initial operational capability (IOC) for its fleet of 24 F-35As that it has received to date from its order for 46 F-35As. In 2022, the Netherlands announced they will order an additional 6 F-35s, totaling 52 aircraft ordered.


Variants

The F-35 was designed with three initial variants – the F-35A, a CTOL land-based version; the F-35B, a STOVL version capable of use either on land or on aircraft carriers; and the F-35C, a CATOBAR carrier-based version. Since then, there has been work on the design of nationally specific versions for Israel and Canada.


F-35A

The F-35A is the conventional takeoff and landing ( CTOL) variant intended for the USAF and other air forces. It is the smallest, lightest version and capable of 9 g, the highest of all variants. Although the F-35A currently conducts
aerial refueling Aerial refueling, also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one aircraft (the tanker) to another (the receiver) while both aircraft a ...
via boom and receptacle method, the aircraft can be modified for probe-and-drogue refueling if needed by the customer. A drag chute pod can be installed on the F-35A, with the Royal Norwegian Air Force being the first operator to adopt it.


F-35B

The F-35B is the short takeoff and vertical landing ( STOVL) variant of the aircraft. Similar in size to the A variant, the B sacrifices about a third of the A variant's fuel volume to accommodate the SDLF. This variant is limited to 7 g. Unlike other variants, the F-35B has no landing hook. The "STOVL/HOOK" control instead engages conversion between normal and vertical flight. The F-35B can also perform vertical and/or short take-off and landing ( V/STOL).


F-35C

The F-35C variant is designed for catapult-assisted take-off but arrested recovery operations from aircraft carriers. Compared to the F-35A, the F-35C features larger wings with foldable wingtip sections, larger control surfaces for improved low-speed control, stronger landing gear for the stresses of
carrier Carrier may refer to: Entertainment * ''Carrier'' (album), a 2013 album by The Dodos * ''Carrier'' (board game), a South Pacific World War II board game * ''Carrier'' (TV series), a ten-part documentary miniseries that aired on PBS in April 20 ...
arrested landings, a twin-wheel nose gear, and a stronger tailhook for use with carrier
arrestor cable An arresting gear, or arrestor gear, is a mechanical system used to rapidly decelerate an aircraft as it lands. Arresting gear on aircraft carriers is an essential component of naval aviation, and it is most commonly used on CATOBAR and STOBAR ...
s. The larger wing area allows for decreased landing speed while increasing both range and payload. The F-35C is limited to 7.5 g.


F-35I "Adir"

The F-35I ''Adir'' (, meaning "Awesome", or "Mighty One") is an F-35A with unique Israeli modifications. The US initially refused to allow such changes before permitting Israel to integrate its own electronic warfare systems, including sensors and countermeasures. The main computer has a plug-and-play function for add-on systems; proposals include an external jamming pod, and new Israeli air-to-air missiles and guided bombs in the internal weapon bays. A senior IAF official said that the F-35's stealth may be partly overcome within 10 years despite a 30 to 40-year service life, thus Israel's insistence on using their own electronic warfare systems. Israel Aerospace Industries (IAI) has considered a two-seat F-35 concept; an IAI executive noted: "There is a known demand for two seats not only from Israel but from other air forces". IAI plans to produce conformal fuel tanks.


Proposed variants


CF-35

The Canadian CF-35 was a proposed variant that would differ from the F-35A through the addition of a drogue parachute and the potential inclusion of an F-35B/C-style refueling probe. In 2012, it was revealed that the CF-35 would employ the same boom refueling system as the F-35A. One alternative proposal would have been the adoption of the F-35C for its probe refueling and lower landing speed; however, the Parliamentary Budget Officer's report cited the F-35C's limited performance and payload as being too high a price to pay. Following the 2015 Federal Election the Liberal Party, whose campaign had included a pledge to cancel the F-35 procurement, formed a new government and commenced an open competition to replace the existing
CF-18 Hornet The McDonnell Douglas CF-18 Hornet (official military designation CF-188) is a Royal Canadian Air Force (RCAF) variant of the American McDonnell Douglas F/A-18 Hornet fighter aircraft. In 1980, the F/A-18 was selected as the winner of the Ne ...
. The CF-35 variant was deemed too expensive to develop, and was never considered. The Canadian government decided to not pursue any other modifications in the
Future Fighter Capability Project List of future or planned Canadian Armed Forces } The Canadian Armed Forces (CAF; french: Forces armées canadiennes, ''FAC'') are the unified military forces of Canada, including sea, land, and air elements referred to as the Royal Canadian Na ...
, and instead focus on the potential procurement of the existing F-35A variant. It has been speculated, however, that the RCAF would still include the drag chute pod as seen on
RNoAF The Royal Norwegian Air Force (RNoAF) ( no, Luftforsvaret, , The Air Defence) is the air force of Norway. It was established as a separate arm of the Norwegian Armed Forces on 10 November 1944. The RNoAF's peacetime establishment is approximatel ...
F-35As for shortened landing distances. On 28 March 2022, the Canadian Government began negotiations with
Lockheed Martin The Lockheed Martin Corporation is an American aerospace, arms, defense, information security, and technology corporation with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It ...
for 88 F-35As to replace the aging fleet of
CF-18 Hornet The McDonnell Douglas CF-18 Hornet (official military designation CF-188) is a Royal Canadian Air Force (RCAF) variant of the American McDonnell Douglas F/A-18 Hornet fighter aircraft. In 1980, the F/A-18 was selected as the winner of the Ne ...
fighters starting in 2025. The project is reported to cost upwards of CA$19bn total over the course of the F-35 program.


New export variant

In December 2021, it was reported that Lockheed Martin was developing a new variant for an unspecified foreign customer. The Department of Defense released US$49 million in funding for this work.


"F-35D" (notional concept)

The "F-35D" was used as a notional 2035 aircraft to illustrate a hypothetical scenario as part of a 2015 USAF study called the Future Operating Concept.


Operators

; *
Royal Australian Air Force "Through Adversity to the Stars" , colours = , colours_label = , march = , mascot = , anniversaries = RAAF Anniversary Commemoration ...
– 50 F-35A delivered as of July 2022, of 72 ordered. ; *
Belgian Air Component The Belgian Air Component ( nl, Luchtcomponent, french: Composante air) is the air arm of the Belgian Armed Forces, and until January 2002 it was officially known as the Belgian Air Force ( nl, Belgische Luchtmacht; french: Force aérienne belg ...
– 34 F-35A planned. ; *
Royal Canadian Air Force The Royal Canadian Air Force (RCAF; french: Aviation royale canadienne, ARC) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environm ...
-16 F-35As ordered in December 2022 of 88 planned. ; * Royal Danish Air Force – 6 F-35A delivered of the 27 planned. ; *
Finnish Air Force , colours = , colours_label = , march = , mascot = , anniversaries = , equipment = 159 , equipment_label ...
– F-35A Block 4 selected via the HX Fighter Program to replace the current F/A-18 Hornets, with 64 F-35As on order. ; *
German Air Force The German Air Force (german: Luftwaffe, lit=air weapon or air arm, ) is the aerial warfare branch of the , the armed forces of Germany. The German Air Force (as part of the ''Bundeswehr'') was founded in 1956 during the era of the Cold War as ...
– 35 F-35A ordered. ; *
Israeli Air Force The Israeli Air Force (IAF; he, זְרוֹעַ הָאֲוִיר וְהֶחָלָל, Zroa HaAvir VeHahalal, tl, "Air and Space Arm", commonly known as , ''Kheil HaAvir'', "Air Corps") operates as the aerial warfare branch of the Israel Defens ...
– 36 delivered as of November 2022 (F-35I "Adir"). Includes one F-35 testbed aircraft for indigenous Israeli weapons, electronics and structural upgrades, designated (AS-15). A total of 50 ordered. ; *
Italian Air Force , colours = , colours_label = , march = (Ordinance March of the Air Force) by Alberto Di Miniello , mascot = , anniversaries = 28 March ...
– 12 F-35As and 1 F-35B delivered as of 2020 with Italy planning to order 60 F-35As and 15 F-35Bs for the Italian Air Force. *
Italian Navy "Fatherland and Honour" , patron = , colors = , colors_label = , march = ( is the return of soldiers to their barrack, or sailors to their ship after a ...
– 2 had been delivered as of October 2020 with 15 F-35Bs planned for the Italian Navy. In 2022 Italy ordered 14 more F-35As and 4 F-35Bs ; * Japan Air Self-Defense Force – 27 F-35As operational as of March 2022 with a total order of 147, including 105 F-35As and 42 F-35Bs.Defence of Japan 2022 (Annual White Paper). p.53.
Japan Ministry of Defence
; * Royal Netherlands Air Force – 24 F-35As delivered and operational out of 37 ordered, 52 F-35As planned in total. ; * Royal Norwegian Air Force – 31 F-35As delivered and operational, of which 21 are in Norway and 10 are based in the US for training as of 11 August 2021 of 52 F-35As planned in total. They differ from other F-35A through the addition of a drogue parachute. ; *
Polish Air Force The Polish Air Force ( pl, Siły Powietrzne, , Air Forces) is the aerial warfare branch of the Polish Armed Forces. Until July 2004 it was officially known as ''Wojska Lotnicze i Obrony Powietrznej'' (). In 2014 it consisted of roughly 16,425 mi ...
– 32 F-35As on order. Plans for two more squadrons consisting of 16 jets each, for a total of 32 additional F-35s. ; * Republic of Korea Air Force – 40 F-35As ordered and delivered as of January 2022, with 20 more F-35As planned. *
Republic of Korea Navy The Republic of Korea Navy (ROKN; ko, 대한민국 해군), also known as the ROK Navy or South Korean Navy, is the naval warfare service branch of the South Korean armed forces, responsible for naval and amphibious operations. The ROK Navy inc ...
– about 20 F-35Bs planned. It has not yet been approved by South Korean parliament. ; *
Republic of Singapore Air Force The Republic of Singapore Air Force (RSAF) is the aerial service branch of the Singapore Armed Forces (SAF) responsible for controlling and defending the airspace of the country, and providing air support to the Army and Navy. It was establi ...
– four F-35Bs to be ordered with option to order eight more as of March 2019. ; *
Swiss Air Force The Swiss Air Force (german: Schweizer Luftwaffe; french: Forces aériennes suisses; it, Forze aeree svizzere; rm, Aviatica militara svizra) is the air component of the Swiss Armed Forces, established on 31 July 1914 as a part of the army an ...
– 36 F-35A ordered to replace the current F-5E/F Tiger II and
F/A-18C/D Hornet The McDonnell Douglas F/A-18 Hornet is an all-weather, twin-engine, supersonic, carrier-capable, multirole combat aircraft, designed as both a fighter and attack aircraft (hence the F/A designation). Designed by McDonnell Douglas (now part ...
. Deliveries will begin in 2027 and conclude in 2030. ; *
Royal Air Force The Royal Air Force (RAF) is the United Kingdom's air and space force. It was formed towards the end of the First World War on 1 April 1918, becoming the first independent air force in the world, by regrouping the Royal Flying Corps (RFC) an ...
and
Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against Fr ...
(owned by the RAF but jointly operated) – 30 F-35Bs received with 26 in the UK after the loss of one aircraft in November 2021; the other three are in the US where they are used for testing and training. 42 (24 FOC fighters and 18 training aircraft) to be fast-tracked by 2023; A total of 48 ordered as of 2021; a total of 138 were originally planned, the expectation in 2021 was to eventually reach around 60 or 80. In 2022, it was announced that the UK would acquire 74 F-35s, with a decision on whether or not to go beyond that number, including the possibility of reviving the original plan of 138 aircraft, to be made in the mid-2020s. ; *
United States Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Si ...
– 302 delivered with 1,763 F-35As planned *
United States Marine Corps The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through c ...
– 114 F-35B/C delivered with 353 F-35Bs and 67 F-35Cs planned *
United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...
– 26 delivered with 273 F-35Cs planned


Order and approval cancellations

; * Turkish Air Force – Four F-35As delivered to Luke Air Force Base for training in July 2018. 30 were ordered, of up to 100 total planned. Future purchases have been banned by the U.S. with contracts canceled by early 2020. All four F-35As have been withheld at Luke Air Force Base and not sent to Turkey. On July 20, 2020, the U.S. government formally approved the seizure of eight F-35As originally bound for Turkey and transferred them to the USAF, together with a contract to modify them to USAF specifications. As of 2022, the U.S. has not refunded the $1.4 billion payment made by Turkey for purchasing the F-35A fighters. ; * United Arab Emirates Air Force - Up to 50 F-35As planned. But on 27 January 2021, the Biden administration temporarily suspended the F-35 sales to the UAE. After pausing the bill to review the sale, the Biden administration confirmed to move forward with the deal on 13 April 2021. In December 2021 UAE withdrew from purchasing F-35s as they did not agree to the additional terms of the transaction on the part of the US.


Accidents and notable incidents

On 23 June 2014, an F-35A's engine caught fire at Eglin AFB. The pilot escaped unharmed, while the aircraft sustained an estimated US$50 million in damage. The accident caused all flights to be halted on 3 July. The fleet returned to flight on 15 July with flight envelope restrictions. In June 2015, the USAF
Air Education and Training Command Air Education and Training Command (AETC) is one of the nine Major Commands (MAJCOM) of the United States Air Force (USAF), reporting to Headquarters, United States Air Force. It was established 1 July 1993, with the realignment of Air Training ...
(AETC) issued its official report, which blamed the failure on the third stage rotor of the engine's fan module, pieces of which cut through the fan case and upper fuselage.
Pratt & Whitney Pratt & Whitney is an American aerospace manufacturer with global service operations. It is a subsidiary of Raytheon Technologies. Pratt & Whitney's aircraft engines are widely used in both civil aviation (especially airlines) and military av ...
applied an extended "rub-in" to increase the gap between the second stator and the third rotor integral arm seal, as well as design alterations to pre-trench the stator by early 2016. On 28 September 2018, the first crash occurred involving a USMC F-35B near Marine Corps Air Station Beaufort,
South Carolina )''Animis opibusque parati'' ( for, , Latin, Prepared in mind and resources, links=no) , anthem = " Carolina";" South Carolina On My Mind" , Former = Province of South Carolina , seat = Columbia , LargestCity = Charleston , LargestMetro = ...
; the pilot ejected safely. The crash was attributed to a faulty fuel tube; all F-35s were grounded on 11 October pending a fleet-wide inspection of the tubes. The next day, most USAF and USN F-35s returned to flight status following the inspection. On 9 April 2019, a JASDF F-35A attached to Misawa Air Base disappeared from radar about east of the
Aomori Prefecture is a prefecture of Japan in the Tōhoku region. The prefecture's capital, largest city, and namesake is the city of Aomori. Aomori is the northernmost prefecture on Japan's main island, Honshu, and is bordered by the Pacific Ocean to the eas ...
during a training mission over the Pacific Ocean. The pilot, Major Akinori Hosomi, had radioed his intention to abort the drill before disappearing. The US and Japanese navies searched for the missing aircraft and pilot, finding debris on the water that confirmed its crash; Hosomi's remains were recovered in June. In response, Japan grounded its 12 F-35As. There was speculation that China or Russia might attempt to salvage it; the
Japanese Defense Ministry The is an executive department of the Government of Japan responsible for preserving the peace and independence of Japan, and maintaining the country’s national security and the Japan Self-Defense Forces. The ministry is headed by the Mi ...
announced there had been no "reported activities" from either country. The F-35 reportedly did not send a distress signal nor did the pilot attempt any recovery maneuvers as it descended at a rapid rate. The accident report attributed the cause to the pilot's
spatial disorientation Spatial disorientation results in a person being unable to determine their position or relative motion, commonly occurring during periods of challenging visibility, since vision is the dominant sense for orientation. The auditory system, vestibul ...
. On 19 May 2020, a USAF F-35A from the 58th Fighter Squadron crashed while landing at Eglin AFB. The pilot ejected and was in stable condition. The accident was attributed to a combination of pilot error induced by fatigue, a design issue with the oxygen system and the aircraft's more complex nature being distracting, as well as a malfunctioning head-mounted display and an unresponsive flight control system. On 29 September 2020, a USMC F-35B crashed in Imperial County, California, after colliding with a Marine Corps KC-130 during
air-to-air refuelling Aerial refueling, also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one aircraft (the tanker) to another (the receiver) while both aircraft a ...
. The F-35B pilot was injured in the ejection, and the KC-130 crash-landed gear up in a field. On 12 March 2021, during a close air support weapons training night-time flight near
Marine Corps Air Station Yuma Marine Corps Air Station Yuma or MCAS Yuma is a United States Marine Corps air station. It is the home of multiple squadrons of F-35B Lightning IIs of the 3rd Marine Aircraft Wing, Marine Aviation Weapons and Tactics Squadron 1 (MAWTS-1), Mar ...
,
Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...
, a round fired from the belly-mounted gunpod on a F-35B, a 25mm GAU/A gatling gun, detonated shortly after leaving the barrel of the gun. This specific round fired was a PGU-32/B SAPHEI-T (Semi armor piercing high explosive incendiary tracer), which is designed to detonate after the round has penetrated the target's armor, beginning a
fuze In military munitions, a fuze (sometimes fuse) is the part of the device that initiates function. In some applications, such as torpedoes, a fuze may be identified by function as the exploder. The relative complexity of even the earliest fuze ...
delayed explosion and then spread the incendiary material. These rounds are also equipped with graze detection, meaning even with a slight grazing blow to a target they will explode and spread the incendiary substance. The mishap was classified as a Class C, meaning the damage incurred a cost of between $60,000-$600,000 to repair, and/or a nonfatal injury forcing lost time from work for the remainder of the working day that the injury occurred. The aircraft itself was grounded for maintenance for over three months, but the pilot was uninjured. The shrapnel from the round penetrated several parts of the aircraft, requiring their replacement. On 17 November 2021, a Royal Air Force F-35B crashed during routine operations in the Mediterranean. The pilot was safely recovered to . Early reports suggested some of "the covers and engine blanks" had not been removed before takeoff. The wreckage, including all security sensitive equipment, was largely recovered with the assistance of U.S. and Italian forces. On 4 January 2022, a South Korean Air Force F-35A made a belly landing after all systems failed except the flight controls and the engine. The pilot heard a series of bangs during low altitude flight, and various systems stopped working. The control tower suggested that the pilot eject, but he managed to land the plane without deploying the landing gear, walking away uninjured. On 24 January 2022, a USN F-35C with
VFA-147 Strike Fighter Squadron 147 (VFA-147), also known as the "Argonauts," is a United States Navy strike fighter squadron based at Naval Air Station Lemoore, California (USA). VFA-147 was established on 1 February 1967 and flies the F-35C Lightning ...
suffered a
ramp strike A ramp strike or rampstrike is when an aircraft coming to land aboard an aircraft carrier impacts the rear of the carrier, also called the ramp, below the level of the flight deck. Damage from a ramp strike to the aircraft can range from broken ...
while landing on the and was lost overboard in the
South China Sea The South China Sea is a marginal sea of the Western Pacific Ocean. It is bounded in the north by the shores of South China (hence the name), in the west by the Indochinese Peninsula, in the east by the islands of Taiwan and northwestern Ph ...
, injuring seven crew members. The pilot ejected safely and was recovered from the water. On 2 March 2022, the aircraft was recovered from a depth of approximately with the aid of a remotely operated vehicle ( ROV). On 19 October 2022, an F-35A crashed at the North end of the runway at
Hill Air Force Base Hill Air Force Base is a major U.S. Air Force (USAF) base located in northern Utah, just south of the city of Ogden, and bordering the Cities of Layton, Clearfield, Riverdale, Roy, and Sunset with its largest border immediately adjacent t ...
, Utah. The pilot safely ejected and was unharmed. The cause of the crash is under investigation. On 15 December 2022, an F-35B crashed during a failed vertical landing at Naval Air Station Joint Reserve Base Fort Worth in Texas. The pilot ejected on the ground and was not seriously injured. The aircraft was undergoing production test flying by a government pilot and had not yet been delivered by the manufacturer to the US military.


Specifications (F-35A)


Differences between variants


Appearances in media


See also


Notes


References


Bibliography

* * * Lake, Jon. "The West's Great Hope". ''
AirForces Monthly ''Air Forces Monthly'' is a military aviation magazine published by Key Publishing, and based in Stamford, Lincolnshire, United Kingdom. It was established in 1988. It provides news and analysis on military aviation, technology and related topic ...
'', December 2010. *


Further reading

* * *


External links


Official JSF web site

Official F-35 Team web site

F-35 page on U.S. Naval Air Systems Command site

F-35 – Royal Air Force
{{Authority control F-035 Lightning II 2000s United States fighter aircraft Single-engined jet aircraft Lift fan Carrier-based aircraft Stealth aircraft Mid-wing aircraft Aircraft first flown in 2006 Articles containing video clips