本文以A320飞机的客舱余压警告灯空中闪亮故障为例,介绍了一种民用飞机故障诊断中,在熟悉系统工作原理及电路图的基础上,采取人工设置条件,地面模拟重现飞机在空中、电路短/断路、起落架收起等特殊条件下发生的故障,从而帮助维修人员在非特殊情况下快速准确判断故障根源的好方法。 In this paper, the A320 aircraft cabin pressure warning lights flashing lights in the sky as an example, introduced a civil aircraft fault diagnosis, familiar with the system principle and circuit diagram based on the manual setting conditions, ground simulation to reproduce the aircraft in the air , Circuit short / open circuit, undercarriage and other special conditions occur failure, to help maintenance personnel in non-special circumstances quickly and accurately determine the root cause of the failure of a good way.