Abstract: For the sake of evaluating fatigue risk of civil aviation maintenance personnel in a quantitative way, firstly an evaluation index system of fatigue inducing factors was developed based on Delphi method and a fatigue risk evaluation model for aviation personnel was built based on the gray clustering principles. Then the practical data were collected from a certain maintenance company and a case study was conducted for validating the model. Finally, the model was integrated into the development of a fatigue maintenance management system where the electronic questionnaire processing and the automated calculation process were realized. The findings of this study indicate that this gray clustering model could be used to quantitatively evaluate fatigue risk of maintenance personnel and the system could be used by maintenance organizations as a practical tool for fatigue risk management.

Key words: maintenance personnel, fatigue risk, risk evaluation, gray clustering, fatigue risk management system