Abstract: Traditional fault location methods for civil aircrafts rely only on the usage and experiments, which are time consuming and require manual operations.According to the reliability indexes and the framework of the civil aircraft, a two-layer two-level decision-making method is proposed.It takes the design attributes as a main consideration and uses a fitting method for data standardization and weight determination to locate faults.Practical examples show effectiveness of the method, which is an improvement to the traditional methods.

Key words: decision-making, framework, fault orientation, reliability indexes