An improved version of China's FC-31 Gyrfalcon stealth fighter jet has conducted its maiden flight in Shenyang, capital of Liaoning province, according to aviation industry sources.

Previously known as the J-31, the twin engine, radar evading aircraft is still under development by Shenyang Aircraft Corp, part of the Aviation Industry Corp of China.

The first test flight of the FC-31's second prototype took place on Friday morning at Shenyang Aircraft Corp, four years after the first prototype took to the skies, sources said.