Wu Hao was born in 1982. Now he is a Ph. D. candidate in Nanjing University of Aeronautics and Astronautics (NUAA). His research interests include aircraft maintenance, maintenance programming, and fault diagnosis. E-mail: michaelwu2010@ 126.com Zuo Hongfu was born in 1959. He is a professor and a doctoral supervisor in NUAA. His research interests include aircraft maintenance and fault diagnosis. E-mail: rms@nuaa.edu.cn