TCAS is an important guarantee to ensure the safety of flying aircraft. Given the cur-rent status of the domestic aviation electronic repair, this paper analyzes the board TCAS fault models and circuit structures. And case-based reasoning approach is introduced in fault diagnosis system, so it is helpful to enhance the efficiency of deep fault diagnosis of TCAS board.% TCAS 是保证飞机安全飞行的重要保障。本文分析了 TCAS 板卡的故障模型和电路结构，在故障诊断系统中引入案例推理方法，对增强 TCAS 板卡深度故障诊断的效率有很大帮助。
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