The J-11BH/BHS is a single seat, twin-engine air superiority fighter produced by the Shenyang Aircraft Corporation. It is based on the Soviet-designed Sukhoi-Su 27. The PLAAF currently operates around 260 J-11 of all types. In the past, the PLAAF purportedly had troubles with the indigenously-developed jet engine for the J-11, which required servicing after 30 hours, in comparison to 400 hours for Russian-made engines.
The deployment of J-11BH/BHS aircraft will be an additional obstacle for U.S. surveillance aircraft monitoring Chinese activities in the South China Sea. Stationed at Woody Island, rather than Hainan, J-11 fighter aircraft will be able to extend their operational range in the South China Sea by up to 223 miles (360 kilometers).