overall radar cross-section of the aircraft. Airframe Apart from aluminium-lithium alloys and titanium alloys, carbon-fibre composite materials are used in the construction of the Tejas. The composite materials constitute 45% of the airframe by weight and 90% by surface area, the highest among contemporary aircraft. The upper and lower wing surfaces, wing spars and wing ribs are also made out of carbon-fibre composites, while the fin tip is made out of glass-fibre. The extensive use of composite materials in the airframe not only makes the aircraft lighter but also gives high strength. This also reduces the number of joints or rivets, increases the aircraft's structural integrity and lowers its susceptibility to fatigue cracks. The tailfin is a monolithic honeycomb structure, reducing the manufacturing cost by 80% compared to traditional methods. Initially the Tejas prototypes were equipped with a radome made out of Kevlar which was replaced with a quartz radome in the production aircraft. The naval LCA has a nose droop to provide improved view for carrier landings. In addition to the elevons, the naval LCA have wing leading–edge vortex controllers (LEVCON) control surfaces that extend from the wing-root leading edge, which could be deflected to a downward angle or an upward angle to increase lift and reduce airspeed during approach. The LEVCONs also provides better low-speed handling and increase controllability at high angles of attack (AoA). The naval Tejas also has a strengthened undercarriage, stronger landing gear, and an arrestor hook system for carrier landings. The two-seat LCA Navy variant (NP-1) have aerodynamic commonality with the trainer variant. Avionics The avionics of the Tejas Mark 1 is centered around Elta EL/M-2032 radar. Its digital flight control computer developed by ADE and manufactured BEL. It has an electronic warfare (EW) suite domestically developed by Defence Avionics Research Establishment (DARE), which consists of a radar warning receiver (RWR), integrated self-protection jammer, chaff and flare dispenser system. The upgraded variant of the Tejas Mark 1, named the Tejas Mark 1A, will have an AESA radar, new digital flight control computer, new EW suite and updated avionics. Some of the production Mark 1A fighters will be equipped with the Elta EL/M-2052 AESA radar, while rest are expected to fly with the domestically developed Uttam AESA radar. The new EW system for the Mark 1A, developed by DARE and known as the Unified Electronic Warfare suite (UEWS), will have electronic countermeasures and electronic counter-countermeasure