to be delivered by the end of 2014. The maiden flight of the FA-50 took place in 2011. 60 FA-50 aircraft are to be produced for the ROKAF from 2013 to 2016. KAI received a order for FA-50 fighter aircraft in May 2013. In December 2015, KAI announced and revealed the new KAI-LM T-50 T-X upgrade intended to compete in the U.S. T-X program that will start testing in 2016. This variant features a dorsal hump for extra internal fuel and an aerial refuelling receptacle, large area display (LAD), and embedded ground training systems. In October ADEX 2017, KAI unveiled the T-50A as a new variant based on the FA-50 multirole combat aircraft, including fifth generation cockpit, an aerial refuelling receptacle, cockpit multifunction display, dorsal hump for extra internal fuel, and an embedded training suite. In January 2019, KAI has begun development on an improved FA-50 known as block 10 and block 20 upgrades. Block 10 is a software upgrade so it can use the Lockheed Martin AN/AAQ-33 sniper targeting pod, while the block 20 is improvement capability to conduct beyond-visual-range air-to-air missions, carrying munitions such as the AIM-120 AMRAAM. Design Overview The T-50 Golden Eagle resembles the F-16 Fighting Falcon, though it is only 80% of the size. The aerospace engineering units of Samsung, Hyundai, and Daewoo were merged to form KAI, and Lockheed Martin designed the avionics including providing the fly-by-wire system. The trainer has seating for two pilots in a tandem arrangement. The high-mounted canopy developed by Hankuk Fiber is applied with stretched acrylic, providing the pilots good visibility. The trainer has been tested to offer the canopy with ballistic protection against 4 lb objects impacting at 400 knots. The altitude limit is 14,600 m (48,000 ft), and airframe is designed to last 8,000 hours of service. The seven internal fuel tanks have a capacity of 2,655 L (701 US gal), five in the fuselage and two in the wings. An additional 1,710 L (452 US gal) of fuel can be carried in the three external fuel tanks. T-50 trainer variants have a paint scheme of white and red, and aerobatic variants white, black, and yellow. The T-50 uses a single General Electric F404-102 turbofan engine license-produced by Samsung Techwin, upgraded with a FADEC system jointly developed by General Electric and KAI. The engine consists of three-staged fans, a seven-axial-stage arrangement, and an afterburner. The aircraft has