文章对民用飞机复杂航电系统故障诊断进行了研究,通过使用故障树分析法和基于征兆的推理分析法相结合的方式合理优化了排故方案,极大地减少飞机停场周期,提高飞机运营的经济效益,为民用飞机复杂航电系统故障诊断提供一个可行的参考方法。 This paper studies the fault diagnosis of complex avionics system of civil aircraft, and through the combination of fault tree analysis and symptom-based reasoning analysis, it can reasonably optimize the troubleshooting plan, greatly reduce the aircraft parking period and improve the economy of aircraft operation Efficiency, provide a feasible reference method for the fault diagnosis of civil avionics complex avionics system.