HAL Tejas

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Tejas
LCA Tejas.jpg
HAL Tejas, India's Light Combat Aircraft
Role Multirole fighter
National origin India
Manufacturer Hindustan Aeronautics Limited (HAL)
Design group Aeronautical Development Agency
First flight 4 January 2001
Introduction 20 December 2013[1]
Status In production
Primary users Indian Air Force
Indian Navy
Number built 14 (including prototypes)[2]
Program cost US$1.2 billion[3]
Unit cost
INR1.62 billion (US$27 million) (Mark I)[4][5]

The HAL Tejas (Sanskrit pronunciation: [t̪eːdʒəs] Sanskrit:तेजस) is a 4+ generation,[6] multirole light fighter developed by India. It is a tailless,[N 1] compound delta-wing design powered by a single engine. It came from the Light Combat Aircraft (LCA) programme, which began in the 1980s to replace India's ageing MiG-21 fighters. Later, the LCA was officially named "Tejas",[7][N 2] meaning "Radiance" by then Prime Minister Atal Bihari Vajpayee.[8]

The Tejas has a pure delta wing configuration, with no tailplanes or foreplanes, and a single dorsal fin. It integrates technologies such as relaxed static stability, fly-by-wire flight control system, multi-mode radar, integrated digital avionics system, composite material structures, and a flat rated engine. It is supersonic and highly manoeuvrable, and is the smallest and lightest in its class of contemporary combat aircraft.[6]

The Tejas is the second supersonic fighter developed indigenously by Hindustan Aeronautics Limited (HAL) after the HAL Marut. The Indian Air Force (IAF) is reported to have a requirement for 200 single-seat and 20 two-seat conversion trainers, while the Indian Navy may order up to 40 single-seaters to replace its Sea Harrier FRS.51 and Harrier T.60.[9] The Tejas was cleared in January 2011 for use by Indian Air Force pilots. It received the second of three levels of operational clearance on 20 December 2013.[10][11]

Development[edit]

LCA programme[edit]

HAL Tejas at Aero India 2007

In 1969, the Indian government accepted the recommendation by its Aeronautics Committee that Hindustan Aeronautics Limited (HAL) should design and develop an advanced technology fighter aircraft around a proven engine. Based on a 'Tactical Air Support Aircraft' ASR markedly similar to that for the Marut,[12] HAL completed design studies in 1975, but the project fell through due to inability to procure the selected "proven engine" from a foreign manufacturer and the IAF's requirement for an air superiority fighter with secondary air support and interdiction capability remained unfulfilled.[13]

In 1983 IAF realized the need of an indigenous combat aircraft for two primary purposes. The principal and most obvious goal was the development of a replacement aircraft for India's ageing MiG-21fighters. The MiG-21 has been the mainstay of the Indian Air Force since the 1970s. The "Long Term Re-Equipment Plan 1981" noted that the MiG-21s would be approaching the end of their service lives by the mid-1990s, and that by 1995 the IAF would lack 40% of the aircraft needed to fill its projected force structure requirements.[14]

The LCA programme's other main objective was to serve as the vehicle for an across-the-board advancement of India's domestic aerospace industry.[15] The value of the aerospace "self-reliance" initiative is not simply the production of an aircraft, but also the building of a local industry capable of creating state-of-the-art products with commercial spin-offs for a global market. The LCA program was intended in part to further expand and advance India's indigenous aerospace capabilities.[16]

To better accomplish these goals, the government chose to take a different management approach, and in 1984 established the Aeronautical Development Agency (ADA) to manage the LCA programme.Although the Tejas is most often described as a product of Hindustan Aeronautics Limited (HAL), responsibility for the development of the Tejas actually belongs to ADA, a national consortium of over 100 defence laboratories, industrial organisations, and academic institutions with HAL being the principal contractor.[17]

The Indian government's "self-reliance" goals for the LCA include indigenous development of the three most sophisticated — and hence most challenging — systems: the fly-by-wire (FBW) flight control system (FCS), multi-mode pulse-doppler radar, and afterburning turbofan engine.[18]

Of the five critical technologies the ADA identified at the beginning of the LCA programme as needing to be mastered for India to be able to design and build a "completely indigenous" fighter, two have been entirely successful: the development and manufacture of advanced carbon-fibre composite (CFC) structures and skins and a modern "glass cockpit." In fact, ADA has had a profitable commercial spin-off in its Autolay integrated automated software system for the design and development of 3-D laminated composite elements (which has been licensed to both Airbus and Infosys).[18] These successes have gone mostly unnoticed in the shadow of the problems encountered with the other three key technology initiatives. Nonetheless, as a result of the accomplishments of India's domestic industries, presently about 70% of the components in LCA are manufactured in India and the dependence on imported components used would be progressively reduced in the coming years.[19]

HAL serves as the prime contractor and has leading responsibility for LCA design, systems integration, airframe manufacturing, aircraft final assembly, flight testing, and service support.[17] The ADA itself has primary responsibility for the design and development of the LCA's avionics suite and its integration with the flight controls, environmental controls, aircraft utilities systems management, stores management system, etc.

HAL Tejas at Aero India 2009.

Of particular importance are the initiatives to develop an indigenous flight control system, radar, and engine for the LCA. The National Aeronautics Laboratory (NAL)—now called the National Aerospace Laboratories—was selected to lead the development of the flight control laws, supported by the Aeronautical Development Establishment (ADE). HAL and the Electronics and Radar Development Establishment (LRDE)[N 3] are jointly developing the Tejas' Multi-Mode Radar (MMR). The GTRE is responsible for the design and parallel development of the GTX-35VS Kaveri afterburning turbofan engine for the Tejas.

The IAF's Air Staff Requirement for the LCA were not finalised until October 1985. This delay rendered moot the original schedule which called for first flight in April 1990 and service entry in 1995; however, it also proved a boon as it is gave the ADA time to better marshal national R&D and industrial resources, recruit personnel, create infrastructure, and to gain a clearer perspective of which advanced technologies could be developed indigenously and which would need to be imported.[13][20]

Project definition commenced in October 1987 and was completed in September 1988. Dassault Aviation of France was hired as a consultant to review the PD and provide advice based on its extensive aviation expertise. The PD phase is a critical early element in the aircraft design and development process because from this flow key elements of the detailed design, manufacturing approach, and maintenance requirements.[21]

The ambitiousness of the LCA programme in terms of pursuing self-reliance in aviation technologies is illustrated by the fact that out of a total of 35 major avionics components and line-replaceable units (LRUs), only three involve foreign systems. These are the multi-function displays (MFDs) by Sextant (France) and Elbit (Israel), the helmet-mounted display and sight (HMDS) cueing system by Elbit, and the laser pod supplied by Rafael (Israel). However, even among these three, when the LCA reaches the production stage, the MFDs are expected to be supplied by Indian companies. A few other important items of equipment (such as the Martin-Baker ejection seat) have been imported. As a consequence of the embargo imposed on India after its nuclear weapons tests in May 1998, many items originally planned to be imported were instead developed indigenously. The nuclear test sanctions delayed the development of technologies that were already many years behind schedule.[21]

Development history[edit]

HAL Tejas parked next to F-16 Fighting Falcon and Eurofighter at 2009 Aero India.

The LCA design was finalised in 1990 as a small tail-less delta winged machine with relaxed static stability (RSS) to enhance manoeuvrability performance. The sophisticated avionics and advanced composite structure specified caused some concern almost immediately, and the IAF expressed doubt that India possessed sufficient technological infrastructure to support such an ambitious project.[citation needed] A governmental review committee was formed in May 1989 which reported out a general view that Indian infrastructure, facilities and technology had advanced sufficiently in most areas to undertake the project. As a measure of prudence, though, it was decided that the full-scale engineering development (FSED) stage of the programme would proceed in two stages.[citation needed]

Phase 1 would focus on "proof of concept" and would comprise the design, development and testing (DDT) of two technology demonstrator aircraft (TD-1 and TD-2) and fabrication of a structural test specimen (STS) airframe; only after successful testing of the TD aircraft would the Indian government give its full support to the LCA design. This would be followed by the production of two prototype vehicles (PV-1 and PV-2), and creation of the necessary basic infrastructure and test facilities for the aircraft would begin.[citation needed]

Phase 2 would consist of the manufacturing of three more prototype vehicles (PV-3 as the production variant, PV-4 as the naval variant, and PV-5 as the trainer variant) and a fatigue test specimen, and the construction of further development and test facilities at various work centres.[citation needed]

Phase 1 commenced in 1990 and HAL started work on the technology demonstrators in mid-1991; however, a financial crunch resulted in full-scale funding not being authorised until April 1993, with significant work on FSED Phase 1 commencing in June. The first technology demonstrator, TD-1, was rolled out on 17 November 1995 and was followed by TD-2 in 1998, but they were kept grounded for several years due to structural concerns and trouble with the development of the flight control system.[22]

One of the most ambitious requirements for the LCA was the specification that it would have "relaxed static stability" (RSS). Although Dassault had offered an analogue FCS system in 1988, the ADA recognised that digital flight control technology would soon supplant it.[18] RSS technology was introduced in 1974 on the General Dynamics YF-16, which was the world's first production aircraft to be slightly aerodynamically unstable by design. Most aircraft are designed with "positive" static stability, which means they have a natural tendency to return to level and controlled flight in the absence of control inputs; however, this quality tends to oppose the pilot's efforts to manoeuvre. An aircraft with "negative" static stability (i.e., RSS), on the other hand, will quickly depart from level and controlled flight unless the pilot constantly works to keep it in trim; while this enhances manoeuvrability, it is very wearing on a pilot relying on a mechanical flight control system.[citation needed]

Development of a FBW flight control system requires extensive knowledge of flight control laws and the expensive writing of a considerable amount of software code for the flight control computers, as well as its integration with the avionics and other electronic systems. When the LCA programme was launched, FBW was a state-of-the-art technology and such a sensitive one that India could find no nation willing to export it. Therefore, in 1992 the LCA National Control Law (CLAW) team was set up by the National Aeronautics Laboratory to develop India's own version.[citation needed] The CLAW team's scientists and mathematicians were successful in developing their control laws, but could not test them since India did not possess advanced real-time ground simulators at that time. Accordingly, British Aerospace (BAe) and Lockheed Martin were brought in to help in 1993, but the effort required for the Aeronautical Development Establishment to code the control laws into the FCS software proved a much larger job than originally anticipated.[citation needed]

Specific control law problems were tested on BAE's simulators (and on HAL's, once theirs became available). As it was being developed, progressive elements of the coding were checked out on the "Minibird" and "Ironbird" test rigs at the ADE and HAL, respectively. A second series of inflight simulation tests of the integrated flight control software were conducted on the F-16 VISTA (Variable In-flight Stability Test Aircraft) simulator in the U.S. in July 1996, with 33 test flights being carried out. However, Lockheed Martin's involvement was terminated in 1998 as part of an embargo enacted by the U.S. in response to India's second nuclear tests in May of that year.[23]

The NAL's CLAW team eventually managed to successfully complete integration of the flight control laws indigenously, with the FCS software performing flawlessly for over 50 hours of pilot testing on TD-1, resulting in the aircraft being cleared for flight in early 2001. The LCA's maiden flight was made by TD-1 from National Flight Test Centre (NFTC), near Bangalore, on 4 January 2001, and its first successful supersonic flight followed on 1 August 2003. TD-2 made its first flight on 6 June 2002. The automatic flight control system (AFCS) of the Tejas has been highly praised by all of its test pilots, one of whom said that he found it easier to take off with the LCA than in a Mirage 2000.[24]

Another critical technology area tackled for indigenous development by the ADA team is the Multi-Mode Radar (MMR). It was initially planned for the LCA to use the Ericsson Microwave Systems PS-05/A I/J-band multi-function radar,[25] which was developed by Ericsson and Ferranti Defence Systems Integration for the Saab JAS-39Gripen.[N 4]However, after examining other radars in the early 1990s,[N 5] the DRDO became confident that indigenous development was possible. HAL's Hyderabad division and the LRDE were selected to jointly lead the MMR program and the radar development effort began in 1997.[27]

The DRDO's Centre for Airborne System (CABS) is responsible for running the test programme for the MMR. Between 1996 and 1997, CABS converted the surviving HAL/HS-748M Airborne Surveillance Post (ASP) testbed into a testbed for the avionics and radar of the LCA.[citation needed]

Tejas aircraft flying in formation.

By mid-2002, development of the MMR was reported to be experiencing major delays and cost escalations. By early 2005 only the air-to-air look-up and look-down modes — two very basic modes — were confirmed to have been successfully tested. In May 2006 it was revealed that the performance of several modes being tested still "fell short of expectations."[28] As a result, the ADA was reduced to running weaponisation tests with a weapon delivery pod, which is not a primary sensor, leaving critical tests on hold. According to test reports, the crux of the problem is a serious compatibility issue between the radar and the advanced signal processor module (SPM) built by the LRDE. Acquisition of an "off-the-shelf" foreign radar is an interim option being seriously considered.[27][29][30]

Engine and propulsion[edit]

Initially, it was decided to equip the prototype aircraft with the General Electric F404-GE-F2J3 afterburning turbofan engine. Simultaneously, in 1986, a parallel programme to develop an indigenous powerplant was also launched. Led by the Gas Turbine Research Establishment, the GTRE GTX-35VS, named "Kaveri", was expected to replace the F404 on all production aircraft. However, progress in the Kaveri development programme was slowed by technical difficulties.

Development snags with the Kaveri resulted in the 2003 decision to procure the uprated F404-GE-IN20 engine for the eight pre-production LSP aircraft and two naval prototypes. General Electric was awarded a US$105 million contract in 2004 for development engineering and production of 17 -IN20 engines, delivery of which began in 2006. The F404-GE-IN20 was trial-installed on the Tejas and the engine generated more than 19,000 pounds (85 kN) uninstalled thrust and completed 330 hours of Accelerated Mission testing, equivalent of 1,000 hours of flight operation. In 2007, an additional 24 F404-IN20 afterburning engines were ordered to power the first operational squadron of Tejas fighters.[31]

In mid-2004, the Kaveri failed its high-altitude tests in Russia, ending the last hopes of introducing it with the first production Tejas aircraft.[N 6] In February 2006, the ADA awarded a contract to the French aircraft engine company Snecma for technical assistance in working out the Kaveri's problems.[9] The Kaveri engine based on Snecma’s new core, an uprated derivative of the M88-2 engine that powers the French Rafale fighter, providing 83–85 kilonewtons (kN) of maximum thrust was being considered a third option by DRDO. This led the IAF to object that since Snecma had already developed the core of the engine, the DRDO will not be participating in any joint development but merely providing Snecma with an indigenous stamp.[32]

In 2008, it was announced that the Kaveri would not be ready in time for the Tejas, and that an in-production powerplant would have to be selected[33] in the 95 to 100 kilonewton (kN) (21,000–23,000 lbf) range to allow the aircraft to perform combat maneuvers with optimal weapons load. The contenders were the Eurojet EJ200 and the General Electric F414.[34] IAF sources said that the airframe will have to be redesigned to accommodate the heavier engine, which is to take up to three-four years.[35]

After evaluation and acceptance of the technical offer provided by both Eurojet and GE Aviation, the commercial quotes were compared in detail and GE Aviation was declared as the lowest bidder. The deal will cover purchase of 99 GE F414 engines. The initial batch will be supplied by GE and the remainder will be manufactured in India under a transfer of technology arrangement.[36][37]

2005–2013[edit]

Tejas trainer under construction
Tejas Trainer at 62nd Republic Day of India Parade, New Delhi

In March 2005, the IAF placed an order for 20 aircraft, with a similar purchase of another 20 aircraft to follow. All 40 will be equipped with the F404-GE-IN20 engine.[38][39][40] A 14 member "LCA Induction Team" was formed at Bangalore to prepare the Tejas for service and assist with its induction into service.[41][42]

The first production variant of the Tejas (LSP-1) flew on June 2008. The Tejas completed 1,000 test flights by January 2009 with more than 530 hours of inflight testing. By February 2009 officials of the Aeronautical Development Agency stated that the Tejas had started flying with weapons and integration of radars would be completed by March 2009. In addition, they stated that nearly all system development activity would be completed by that time.[43] The Tejas achieved a speed of over 1,350 kilometres per hour (840 mph) during its sea level flight trials in 2009.[44]

In April 2010, the third production aircraft (LSP-3) flew with a hybrid version of the Elta EL/M-2032 multi-mode radar,[45] and by June 2010, the fourth production aircraft took flight in the configuration it would be delivered to the Indian Air Force in.[46]

By June 2010, the Tejas had also completed the second phase of hot weather trials. The objective of the hot weather trials was to prove that the aircraft was in an IOC configuration with the weapon system and sensors integrated.[47] The sea trials of the aircraft are also being carried out.[48] LSP-5 with IOC standard equipment took to skies on 19 November 2010.[49]

The trainer variant prototype took to the skies in November 2009.[50] In December 2009, the Indian government sanctioned INR8000 crore (US$1.3 billion) to begin production of the fighter jet for the Indian Air Force and Indian Navy. The Indian Navy has a requirement of 50 Tejas aircraft and the first prototype, NP-1 was rolled out in July 2010.[51] IAF ordered 20 additional Tejas fighters after the defence acquisition council cleared the plan.[52]

In November 2010, it was reported that the Tejas Mk1 reportedly fell short of the relaxed Air Staff Requirements stipulated for limited series production (LSP) aircraft. The areas that did not meet requirements were power to weight ratio, sustained turning rate, maximum speeds at low altitudes, AoA range, and weapon delivery profiles. The extent of the deficiencies was classified.[53]

Initial Operating Clearance (IOC) for the Tejas was awarded on 10 January 2011 by Defence Minister A K Antony to Chief of Air Staff Air Chief Marshal P V Naik. IOC allows IAF pilots to use the aircraft. The IAF plans to raise the first squadron in Bengaluru to iron out issues with ADA and HAL, and eventually base these fighters at Sulur Air Force Station, Coimbatore in the southern state of Tamil Nadu.[39][40][54][55]

The weapon tests including bombing begun in September 2011 at Pokhran range, to be followed by missile firing tests at Goa.[56] RAFAEL’s Derby fire-and-forget missile will serve as the Tejas’ initial medium range air-air armament.[57]

Tejas' Final Operational Clearance (FOC) was reportedly delayed from December 2012 until mid-2013 or later.[58][59] The Tejas program has enlisted EADS to help expand the flight envelope to meet service requirements.[60]

The Naval LCA made its first flight, almost two years after being rolled out, on 27 April 2012.[61]

Tejas at Aero India 2013

On 27 June 2012, three HAL Tejas (LSP 2, 3 and 5) completed precision bombing runs in the desert of Rajasthan, where they deployed a series of weapons, including laser-guided 1,000 lb bombs and unguided bombs. The LCA had conducted similar bombing runs in the month of September 2011 at Pokhran.[62] The Tejas has completed 1,941 flights by July 2012.[63] Some defence sources indicate that it will not reach FOC and become fully combat capable until 2015.[64]

The Tejas was grounded for over three months in the later half of 2012 because new helmets for the pilots extended above the ejection seats. The helmets could have prevented a smooth ejection by hitting the canopy before it was blown off, and represented a serious safety issue, hence flight testing was stopped in August 2012. The ejection systems were modified to rectify this issue, and flight tests resumed in November.[65] LSP 8 had a successful maiden test flight on 31 March 2013,[66] and the program had completed 2,418 test flights by 27 November 2013.[67][68]

Operational clearance[edit]

Tejas releasing a bomb during an attack run.

HAL was instructed by the Indian government to strictly adhere to deadlines to ensure IOC-2 by the end of 2013 and Final Operational Clearance (FOC) by the end of 2014.[69] On 20 December 2013, the Initial Operational Clearance-II of the aircraft was issued, after which it was cleared to be flown by regular pilots of the Indian Air Force and begin induction into squadron service. The first squadron of 18 to 20 fighters will be based at Sulur Air Force Station in the state of Tamil Nadu,[70] and it will work to achieve Final Operational Clearance (FOC) by December 2014.[71] To fulfill the IOC-II standard, the aircraft was certified to carry close to three tons of weapons which include laser-guided 500 kg bombs and short-range R-73 missiles,[72][73] reach top speeds of 1,350 km per hour, withstand turns up to 7g, reach angle of attack of 24 degrees (from 17 degrees initially), and have an operational radius of 400–500 km. Cost of a single unit in the IOC-2 configuration is between INR170 crore (US$28 million) and INR180 crore (US$30 million).[74][75]

To obtain FOC, the fighter will have to be certified for six more criteria. Integration of Derby and Python BVR missiles weighing 150 kg, with a range of 70 km, as well as a Gryazev-Shipunov GSh-23 gun will be undertaken. An air-to-air refueling probe supplied by Cobham will be added. The angle of attack will be increased from 24 to 28 degrees,[74] the braking system will be enhanced, and the existing nose cone radome made of composites will be replaced by a quartz model to increase the current radar range of 45–50 km to more than 80 km. These modifications are expected to be completed within 15 months of IOC-II.[71][76]

Design[edit]

Overview[edit]

PV-3 in Indian Air Force grey camouflage pattern

The Tejas is single-engined multirole fighter which features a tailless, compound delta planform and is designed with "relaxed static stability" for enhanced manoeuvrability. Originally intended to serve as an air superiority aircraft with a secondary "dumb bomb" ground-attack role, the flexibility of this design approach has permitted a variety of guided air-to-surface and anti-shipping weapons to be integrated for more well-rounded multirole and multimission capabilities.[77]

The tailless, compound-delta planform is designed to be small and lightweight.[78] This platform also minimises the control surfaces needed (no tailplanes or foreplanes, just a single vertical tailfin), permits carriage of a wider range of external stores, and confers better close-combat, high-speed, and high-alpha performance characteristics than comparable cruciform-wing designs. Extensive wind tunnel testing on scale models and complex computational fluid dynamics analyses have optimised the aerodynamic configuration of the LCA, giving it minimum supersonic drag, a low wing-loading, and high rates of roll and pitch.[77] Materials used included aluminium-lithium, superplastically formed titanium and carbonfibre composite (CFC). Tejas employs CFC materials for up to 45 per cent of its airframe, including in the fuselage (doors and skins), wings (skin, spars and ribs), elevons, tailfin, rudder, air brakes and landing gear doors.[79] The wing and fin of the compound-delta aircraft are of carbon-fiber-reinforced polymer, and were designed to provide a minimum weight structure and to serve as integral fuel tanks.[80][81]

All weapons are carried on one or more of seven hardpoints with total capacity of greater than 4,000 kg: three stations under each wing and one on the under-fuselage centreline. An eighth offset station beneath the port-side intake trunk can carry a variety of pods like FLIR, IRST, laser rangefinder/designator, as can the centreline under-fuselage station and inboard pairs of wing stations.[23][82][83] Auxiliary fuel tanks of 800 and 1,200 liters can be carried under the fuselage to extend range. An aerial refueling probe on the starboard side of the forward fuselage can further extend range and endurance.[84] Although two-seat variants of the LCA are planned, the examples built to date are crewed by a single pilot on a Martin-Baker zero-zero ejection seat. The British Martin-Baker ejection seat is planned to be replaced with a locally developed alternative.[85]

Airframe[edit]

Composites in the LCA

The LCA is constructed of aluminium-lithium alloys, carbon-fibre composites (C-FC), and titanium-alloy steels. The Tejas employs C-FC materials for up to 45% of its airframe by weight, including in the fuselage (doors and skins), wings (skin, spars and ribs), elevons, tailfin, rudder, air brakes and landing gear doors. Composites are used to make an aircraft both lighter and stronger at the same time compared to an all-metal design, and the LCA's percentage employment of C-FCs is one of the highest among contemporary aircraft of its class.[86] Apart from making the plane much lighter, there are also fewer joints or rivets, which increases the aircraft's reliability and lowers its susceptibility to structural fatigue cracks.[87] The tailfin is a monolithic honeycomb piece, reducing the manufacturing cost by 80% compared to the "subtractive" or "deductive" method, involving the carving out of a block of titanium alloy by a computerised numerically controlled machine. No other manufacturer is known to have made fins out of a single piece.[88]

Tejas at Aero-India 09

The use of composites in the LCA resulted in a 40% reduction in the total number of parts compared to using a metallic frame. Furthermore, the number of fasteners has been reduced by half in the composite structure from the 10,000 that would have been required in a metallic frame design. The composite design also helped to avoid about 2,000 holes being drilled into the airframe. Overall, the aircraft's weight is lowered by 21%. While each of these factors can reduce production costs, an additional benefit — and significant cost savings — is realised in the shorter time required to assemble the aircraft — seven months for the LCA as opposed to 11 months using an all-metal airframe.[89]

The airframe of the naval variant of the Tejas will be modified with a nose droop to provide improved view during landing approach, and wing leading edge vortex controllers (LEVCON) to increase lift during approach.[13] The LEVCONs are control surfaces that extend from the wing-root leading edge and thus afford better low-speed handling for the LCA, which would otherwise be slightly hampered due to the increased drag that results from its delta-wing design. As an added benefit, the LEVCONs will also increase controllability at highangles of attack (AoA).[90] The naval Tejas will also have a strengthened spine, a longer and stronger undercarriage, and powered nose wheel steering for deck manoeuvrability.[91][92] The Tejas trainer variant will have "aerodynamic commonality" with the two-seat naval aircraft design.[93]

Flight controls[edit]

The HAL Tejas conducting an inverted pass shown here is an example of fly-by-wire controls.

Since the Tejas is a relaxed static stability design, it is equipped with a quadruplex digital fly-by-wire flight control system to ease pilot handling.[94] The Tejas aerodynamic configuration is based on a pure delta-wing layout with shoulder-mounted wings. Its control surfaces are all hydraulically actuated. The wing's outer leading edge incorporates three-section slats, while the inboard sections have additional slats to generate vortex lift over the inner wing and high-energy air-flow along the tail fin to enhance high-AoA stability and prevent departure from controlled flight. The wing trailing edge is occupied by two-segment elevons to provide pitch and roll control. The only empennage-mounted control surfaces are the single-piece rudder and two airbrakes located in the upper rear part of the fuselage, one each on either side of the fin.[citation needed]

The digital FBW system of the Tejas employs a powerful digital flight control computer (DFCC) made by Aeronautical Development Establishment (ADE) comprising four computing channels, each with its own independent power supply and all housed in a single LRU. The DFCC receives signals from a variety of sensors and pilot control stick inputs, and processes these through the appropriate channels to excite and control the elevons, rudder and leading edge slat hydraulic actuators. The DFCC channels are built around 32-bit microprocessors and use a subset of the Ada programming language for software implementation. The computer interfaces with pilot display elements like the MFDs through MIL-STD-1553B multiplex avionics data buses and RS-422 serial links.[79][95][96] in-flight refuelling capability via retractable probes on the aircraft's starboard side, and an on-board oxygen-generating system for longer missions.

Propulsion[edit]

General Electric F404-IN20 engine for the eight pre-production LSP aircraft and two naval prototypes

The wing-shielded, side-mounted bifurcated, fixed-geometry Y-duct air intakes[97] have an optimised diverter configuration to ensure buzz-free air supply to the engine at acceptable distortion levels, even at high AoA.[citation needed]

The original plan was for the LCA prototype aircraft to be equipped with the General Electric F404-GE-F2J3 afterburning turbofan engine, while the production aircraft would be fitted with the indigenous GTRE GTX-35VS Kaveri turbofan being developed in a parallel. Continued development snags with the Kaveri resulted in a 2003 decision to procure the upgraded GE F404-IN20 engine for the eight pre-production LSP aircraft and two naval prototypes and after accelerated trials an order was placed for 24 more IN20 engines for installation on the first 20 production aircraft. The Tejas Mark II will be equipped with the more powerful GE F414engine.[71][79][97]

Avionics[edit]

The Tejas has a night vision goggles (NVG)-compatible "glass cockpit" that is dominated by an CSIR-CSIO developed indigenous head-up display (HUD), three 5 in x 5 in multi-function displays, two Smart Standby Display Units (SSDU), and a "get-you-home" panel providing the pilot with essential flight information in case of an emergency. The displays provide information on the key flight systems and controls on a need-to-know basis, along with basic flight and tactical data. The pilot interacts with onbooard systems through a multifunction keyboard and several selection panels.[79] The CSIO-developed HUD, Elbit-furnished DASH helmet-mounted display and sight (HMDS),[98] and hands-on-throttle-and-stick (HOTAS) controls reduce pilot workload and increase situation awareness by allowing the pilot to access navigation and weapon-aiming information with minimal need to spend time "head down" in the cockpit.[82][99]

The Tejas is equipped with both GPS and a ring laser gyro based inertial navigation system; for flying in poor conditions, an Instrument Landing System (ILS) and a ground proximity warning system based on the Terrain Referenced Navigation (TRN) system is also employed.[83][100][101] The LCA also has secure and jam-resistant communication systems such as the IFF transponder/interrogator, VHF/UHF radios, and air-to-air/air-to-ground datalinks. The ADA Systems Directorate's Integrated Digital Avionics Suite (IDAS) integrates the flight controls, environmental controls, aircraft utilities systems management, stores management system (SMS), etc. on three 1553B buses by a centralised 32-bit, high-throughput mission computer.[82]

Radar and sensors[edit]

The pulse-Doppler Multi-Mode Radar is designed to keep track of a maximum of 10 targets and allows simultaneous multiple-target engagement. Jointly developed by the LRDE and HAL Hyderabad, the MMR is to perform multi-target search, track-while-scan(TWS), and ground-mapping functions.[97][102][103] It features look-up/look-down modes, low/medium/high pulse repetition frequencies (PRF), platform motion compensation, doppler beam-sharpening, moving target indication(MTI), Doppler filtering, constant false alarm rate (CFAR) detection, range-Doppler ambiguity resolution, scan conversion, and online diagnostics to identify faulty processor modules.[99]

While originally planned to be fitted on the initial production aircraft, delays in the MMR's development prompted the DRDO to co-operate with Israel Aerospace Industries to integrate a hybrid version of the EL/M-2032 radar on the Tejas.[45] The EL/M-2032 radar used in LSP-3 has a detection and tracking range of up to 150 km in air-to-air mode, the air-to-ground mode generates high resolution radar imagery of locations at up to 150 km, and air-to-sea mode can detect and classify naval targets at ranges of up to 300 km.[79] The development of an Active Electronically Scanned Array (AESA) radar is expected to begin pending the selection of a developmental partners between DRDO foreign partners ; prospective partners include Europe's Airbus Group and Israel's Elta. The initial contract is to involve the co-development of 10 prototypes.[104]

Tejas is also to be equippable with an Infra-red search and track (IRST) sensor, which can detect and track thermal energy emissions.[79][105] This system shall be pod-based, additional sensor pods are to include a Drop tanks for ferry flight/extended range/loitering time,FLIR targeting pod, ECM pods, Flares/Infrared decoys dispenser pod and chaff pod, EO/IR sensor pod, LITENING targeting pods Forward looking infrared (FLIR)sensor, and a laser rangefinder/designator, which can be used in various capacities, including reconnaissance, training, or attack.[23][82][83]

Self-protection[edit]

The electronic warfare suite is designed to enhance the survivability during deep penetration and combat. The LCA's EW suite is developed by the Defence Avionics Research Establishment (DARE) with support from the Defence Electronics Research Laboratory (DLRL). This EW suite, known as Mayavi, includes a radar warning receiver (RWR), Missile Approach Warning (MAW) and a Laser warning receiver (LWR) system, self-protection jammer, chaff, jaff and flares dispenser. an electronic countermeasures (ECM) suite and a towed radar decoy (TRD).In the interim, the Indian Ministry of Defense has revealed that an unspecified number of EW suites had been purchased from Israel's Elisra for the LCA prototypes.[100][101][106]

Stealth features have been designed into Tejas.[107] Being very small, there is an inherent degree of visual stealth, but the airframe's use of a high degree of composites (which do not reflect radar waves), a Y-duct inlet which shields the engine compressor face from probing radar waves, and the application of radar-absorbent material (RAM) coatings are intended to minimise its susceptibility to detection and tracking by the radars of enemy fighters.[99][108]

Operational history[edit]

The work to raise the first squadron started in July 2011. The Tejas will be inducted into the 45th squadron, the Flying Daggers and will be based in Bangalore before being moved to Sulur.[109] The squadron will initially consist of four aircraft SP-3 to SP-6. The IAF's Aircraft & Systems Testing Establishment will receive four aircraft already built, the SP-1 and 2 and LSP-7 and 8.[110]

Variants[edit]

Tejas trainer variant
Tejas naval variant

Prototypes[edit]

Aircraft already built and projected models to be built. Model designations, tail numbers and dates of first flight are shown.

Technology Demonstrators (TD)
  • TD-1 (KH2001) – 4 Jan 2001
  • TD-2 (KH2002) – 6 June 2002
Prototype Vehicles (PV)
  • PV-1 (KH2003) – 25 November 2003
  • PV-2 (KH2004) – 1 December 2005
  • PV-3 (KH2005) – 1 December 2006. This is the production variant.
  • PV-4
  • PV-5 (KH-T2009) – 26 November 2009 – Fighter/Trainer Variant
Naval Prototypes (NP)
  • NP-1 – Two-seat Naval variant for carrier operations. Rolled out in July 2010.[111] NP-1 made its first flight on 27 April 2012.[61]
  • NP-2 – Single-seat LCA MK 1 Naval variant for carrier operations. Both NP-1 & NP-2 are powered by GE-404 engine.[61]
  • NP-3 & NP-4 – Single-seat LCA MK 2 Naval variant for carrier operations to be powered by the GE-414 engines. The design work on the two aircraft is nearly complete.[61]
  • NP-5 – Another Single-seat LCA MK 1 Naval variant is planned so as to enhance the pace of certification process for Naval LCA.[61]
Limited Series Production (LSP) aircraft

Currently, 8 LSP series aircraft plus 40 aircraft are on order.

  • LSP-1 (KH2011) – 25 April 2007. This LCA is powered by F404-F2J3 Engine.[112]
  • LSP-2 (KH2012) – 16 June 2008. This is the first LCA fitted with F404-IN20 engine.[112]
  • LSP-3 23 April 2010. The first aircraft to have the Hybrid MMR radar[45] and will be close to the IOC standard.
  • LSP-4 (KH2014) – 2 June 2010. The first aircraft that was flown in the configuration that will be delivered to the Indian Air Force.[46] In addition to the Hybrid MMR, the aircraft flew with a Countermeasure Dispensing System and an identify friend or foe electronic system.[113]
  • LSP-5 (KH2015) – 19 November 2010. IOC standard, with all sensors including night lighting in the cockpit, and an auto-pilot.[114]
  • LSP-6 – Will be used to increase the Angle of Attack.[115] As well as develop better (Experimental) RAM coating to further reduce its radar signature.[116]
  • LSP-7 (KH2017) – 9 March 2012. APU intake has been aerodynamically reshaped.
  • LSP-8 – First flight trial completed in March 2013. LSP 8 is the version that will go for production.[66]
  • SP-1 to SP-40 – Planned to fly by late 2013. The SP-1 and SP-2 will be part of No. 45 Squadron (Flying Daggers) that will be based initially in Bangalore, Karnataka.[116]

Planned production variants[edit]

  • Tejas Trainer – Two-seat operational conversion trainer for the Indian Air Force.
  • Tejas Navy – Twin- and single-seat carrier-capable variants for the Indian Navy. The LCA's naval variant is to be ready for carrier trials by 2013 and is slated for deployment on the INS Vikramaditya as well as the Vikrant class aircraft carrier.[117] It will be equipped for carrier operation with ski-jump take-off and arrested landing. It will include strengthened airframe and landing gear and the nose is drooped for better cockpit vision.[118]

Tejas Mark 2[edit]

Featuring the more powerful General Electric F414-GE-INS6 engine with 98 kN of thrust and refined aerodynamics, the Mark 2 is being developed to meet the Indian Air Force requirements and will incorporate 5th generation fighter elements which are intended to make way into the FGFA and AMCA. The Tejas Mk 2 will now have a length of 14.2 metres (1-metre more than that of the Tejas Mk 1, for incorporating a stretched nose section and a modified fuselage section aft of the cockpit for housing an expanded complement of mission avionics LRUs), height of 4.6 metres (as opposed to 4.4 metres of the Tejas Mk 1, to accommodate an enlarged vertical tail-section) and a wingspan of 8.2 metres, same as that of the Tejas Mk 1, that, however with an increased wing area. External stores capacity will be boosted to 5,000 kg (as opposed to 4,000 kg for the Tejas Mk1), while the twin internal air-intake ducts will be minimally enlarged to cater to the increased airflow requirements of the 98 kN thrust F414-GE-INS6 turbofan built by GE Aero Engines. The Ministry of Defence had, last January, sanctioned US$542.44 million (Rs2,431.55-crore) for ADA to develop the IAF’s Tejas Mk 2 variant and the Indian Navy’s LCA Mk 2 (Navy) variant. The IAF is committed to procuring an initial 83 Tejas Mk 2s and the Indian Navy has expressed its firm requirement for 46 LCA Mk2 (Navy).[38][119][120]

Tejas Mark 3[edit]

Tejas Mark 3 is a planned version. It is to be stealthier than Mark 2 and have composite usage up to 70 percent of the aircraft. The aircraft is to be powered by Kaveri engine once the development of the engine is completed. It is to also feature reduced heat signature.[121][verification needed]

Operators[edit]

 India
  • Indian Air Force – 40 LCA Mk 1 aircraft plus 8 Limited Series Production (LSP) aircraft on order. Plans to order 6 squadrons of LCA Mk 1 and 4 squadrons of LCA Mk 2 aircraft after completing production of LCA Mk 1.[122][123][124] The IAF is considering at least 14 Tejas squadrons with some 300 Tejas aircraft.[125]
  • Indian Navy – Signed an order for six Naval LCAs at an approximate cost of US$ 31.09 million per aircraft.[126] The Indian Navy has a requirement for 40 Tejas aircraft.[51][124]

Specifications (HAL Tejas Mk.1)[edit]

Weapon stations on Tejas

Data from tejas.gov.in[127] DRDO Techfocus,[128] Aero India 2011,[129]

General characteristics

  • Crew: 1
  • Length: 13.20 m (43 ft 4 in)
  • Wingspan: 8.20 m (26 ft 11 in)
  • Height: 4.40 m (14 ft 9 in)
  • Wing area: 38.4 m² (413 ft²)
  • Empty weight: 6,500 kg (14,300 lb)
  • Loaded weight: 9,500 kg[127] (20,944 lb)
  • Max. takeoff weight: 13,200 kg[127] (29,100 lb)
  • Powerplant: 1 × F404-GE-IN20 turbofan
  • Internal fuel capacity: 2,458 kg
  • External fuel capacity: 2 x 1,200 litre drop tank at inboard, 1 x 725-litre drop tank under fuselage

Performance

Armament

  • Guns: 1× mounted 23 mm twin-barrel GSh-23 cannon with 220 rounds of ammunition.
  • Hardpoints: 8 total: 1× beneath the port-side intake trunk for targeting pods, 6× under-wing, and 1× under-fuselage with a capacity of 4,200 kg external fuel and ordnance
  • Missiles:
HAL Tejas carrying R-73 missile and Drop Tank.
Tejas weapon display Aero India 2011

See also[edit]

Related lists

References[edit]

Notes[edit]

  1. ^ The term "tailless" here means that the aircraft lacks horizontal tailplanes; there is still a single vertical tailfin.
  2. ^ According to then Scientific Advisor to Defence Minister, Dr. Vasudev K. Aatre, "Tejas" (Sanskrit, meaning "Radiance" or "Radiant Energy") was selected from a list of 20 names considered for the LCA; the other alternate name would have beenSarang.
  3. ^ Note: The LRDE is sometimes mis-abbreviated as "ERDE". To distinguish between "electrical" and "electronic", the latter is abbreviated with the first letter of its Latin root (lektra). The same approach is used with for the DLRL.
  4. ^ Ericsson Microwave Systems was bought by Saab in June 2006;Ferranti Defence Systems Integration was acquired by GEC-Marconi in 1990, which in turn merged with British Aerospace (BAe) to form BAE Systems in November 1999.
  5. ^ The Westinghouse — now Northrop Grumman — AN/APG-66, which is carried on the F-16, was among the radars evaluated by the ADA in 1992.[26]
  6. ^ Since India does not possess suitable aircraft, the high-altitude testing of the Kaveri is contracted to Russia, which uses a Tu-16 bomber for the purpose. Another Kaveri engine was delivered to Russia for further flight testing from June to September 2006, but on an Il-76 testbed instead of a Tu-16.

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Bibliography[edit]

  • Jackson, Paul, Kenneth Munson and Lindsay Peacock, eds. "ADA Tejas." Jane’s All The World’s Aircraft 2005–06. Coulsdon, Surrey, UK: Jane's Information Group Limited, 2005. ISBN 0-7106-2684-3.
  • Taylor, John W. R., Kenneth Munson and Michael J. H. Taylor, eds. "HAL Light Combat Aircraft." Jane's All The World's Aircraft 1989–1990. Coulsdon, Surrey, UK: Jane's Information Group Limited, 2005. ISBN 0-7106-0896-9.

External links[edit]

Features and analysis:

Technical:

General: