The quality problems encountered with the WS-10A reflected the state of the Chinese aerospace industry. AVIC initiated a general effort to improve quality control throughout its production chain in 2011. The WS-10A reportedly matured enough after 2009 to power the J-11B Block 02 aircraft. A WS-10A-powered J-10B was seen in July 2011, but the engine did not power the initial J-10B production batch, possibly because of production or performance issues. In 2018 it was reported in Chinese state media that the increased heat resistance of new third-generation single-crystal turbine blades had increased the engine lifespan from 800 to 1,500 hours. Unconfirmed reports claimed the first flight of the J-11D was powered by a new WS-10 variant; the variant reportedly had improved reliability, with a thrust of more than 13t, but less than that of the AL-31F-M1. The flight was revealed in early May 2015. The Shenyang WS-20 (WS-188) is a high-bypass engine reportedly producing 13.8 tons of thrust. It is believed to be based on the core of the WS-10A. The Shenyang WS-20 was first seen in January 2014 while being tested on an Il-76, and is believed to be intended for the Y-20 strategic airlifter. A testbed J-10B powered by a WS-10 with thrust vectoring (TVC) was demonstrated at the 2018 China International Aviation & Aerospace Exhibition. The TVC nozzle uses actuator-assisted moving petals, similar in concept to General Electric's axisymmetric vectoring exhaust nozzle (AVEN) and Pratt & Whitney's pitch-yaw balance beam nozzle (PYBBN).