Korea Aerospace Industries
A series of nine prototypes were constructed, the first being complete during June 1991. During November 1991, the maiden flight of the KT-1 took place, after which the flight testing programme formally commenced. During 1995, the aircraft was officially named 'Woongbi'. In 1998, it was announced that the final test flight had been performed. During the following year, an initial production contract was signed for eighty-five aircraft, with provisions for an additional twenty, between manufacturer Korea Aerospace Industries (KAI) and the RKAF.