Abstract: In order to solve the uncertainty of human error risk assessment in the process of civil aircraft manufacturing in China, an improved HFACS model was presented. Firstly, the FMEA were used to assess the risk of human error in the process of civil aircraft assembly, and an improved HFACS model was proposed in combination with the common human factors proposed by the International Civil Aviation Organization (ICAO). The improved HFACS model was used as the evaluation basis of the occurrence and difficulty of man-made errors. Then the rough set method was applied to deal with the uncertainty in information evaluation. The risk of human error was evaluated and sorted by using Preference Ranking Organization Method for Enrichment Evaluations II (PROMETHEE II) method, so as to set the priority of improvement. Finally, the risk of human error in the process of civil aircraft assembly was analyzed to verify the proposed method. The results show that the proposed method is effective and reliable and can provide a reasonable basis for human error risk assessment of civil aircraft manufacturing enterprises.

Key words: quality control, risk assessment, failure mode and effects analysis (FMEA), human factor analysis and classification system (HFACS), rough set