Yu Xu, a female J-10 fighter pilot, died in an accident during a routine flight training on Saturday, an Air Force spokesman said.

Born in 1986, Yu was from Chongzhou city in southwest China’s Sichuan province. She joined the People’s Liberation Army (PLA) Air Force in September 2005, and was serving as a flight squadron leader.

Yu was the first of four female pilots in China capable of flying the country’s third-generation J-10 jet fighter. She piloted a training plane in the military parade marking the 60th anniversary of the founding of the People’s Republic in 2009.

Yu’s last public appearance was in the just-concluded Zhuhai Air Show. All PLA Air Force service members expressed deep regret and mourning at Yu’s unfortunate death.