was converted for this purpose. The development of multi-mode was not smooth, as it suffered some setbacks. By 2005, only two radar modes – the air-to-air look-up and look-down were confirmed to have been successfully tested. The performance of several other modes that had been tested were suboptimal. The problem with the radar was mainly attributed to the lack of compatibility between the LRDE/HAL multi mode radar and the LRDE's advanced signal processor module. Using an "off-the-shelf" foreign radar as an interim option was considered. ADA met with success in the development of three of the five key technologies identified at the beginning of the LCA programme. The successful endeavours were mastery in the FBW flight control system, the development and manufacturing of carbon-fibre composite structures and skins, and a modern glass cockpit. The Autolay computer-aided design software developed as part of the LCA programme has been licensed to Airbus for its A380 wide-body aircraft project. The development of a multi-mode pulse-doppler radar, once delayed was completed as the Active electronically scanned array (AESA) radar and is currently undergoing flight trials. India's self-reliance goal oriented development for the LCA programme has considerably increased the indigenous components in Tejas and contributed to an aviation industry expansion in the country. On 20 December 2021, Ministry of Defence (MoD) in a written reply during winter session of Rajya Sabha clarified that the HAL Tejas is no longer considered as a replacement for the Mikoyan-Gurevich MiG-21, instead it is now part of a general IAF fleet modernisation programme. Prototypes and testing Prototype testing began in 2003, a year after the first flight of the second Technology Demonstrator (TD-2). The first prototype aircraft, PV-1, made its maiden flight in 2003. The first trainer prototype PV-5 was rolled out in 2009 and made its first flight on 26 November 2009. A total of two trainer prototypes were built and designated PV-5 and PV-06. The first naval prototype, designated NP-1, made its first flight on 27 April 2012. It was a twin-seater aircraft, while the second naval prototype, designated as NP-2, was a single seater. Both naval prototypes were used extensively for various aircraft carrier-related trials at the Shore Based Test Facility in Goa. NP-2 was used in the actual carrier trials, where it made an arrested recovery and ski-jump assisted take-off from the aircraft-carrier in January 2020. The first Limited Series Production aircraft (LSP-1) performed its