中ソ国境紛争
Fear of an attack by the USSR, after the Sino-Soviet border conflict, precipitated evacuation of production and development to the Changzhou Airplane Factory and Changhe Aircraft Industries Corporation in 1970. However, the political turmoil in China, namely, Cultural Revolution, took a great toll on the production and only 11 were built before the program was cancelled because the single engine design was deemed unsafe and under-powered.