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ＥＭＤ（发动机状态监控和故障诊断）系统应用于ＭＤ－８２飞机上的ＪＴ８Ｄ－２１７发动机时，由于人工记录和人工键入飞行数据造成飞行数据存在严重的质量问题，给发动机的趋势分析和故障诊断带来很大的困难。本文介绍了ＥＣＭＩ对飞行状态参数进行有效性检查的方法，提出了采用主因子模型对发动机进行故障诊断时，用来识别是飞行状态数据的质量问题，还是发动机指示系统故障的判别准。则强调了记录飞行数据应达到的条件及数据质量的指标。所有这些对提高趋势分析和故障诊断的成功率都取得了很好的结果
EMD (Engine Condition Monitoring and Troubleshooting) System When applied to the JT8D-217 engine on the MD-82 aircraft, there was a serious quality problem with the flight data due to manual recording and manual entry of flight data, giving the engine trend analysis and fault diagnosis Great difficulty. This paper introduces the method of ECMI for checking the validity of flight status parameters and proposes the quality control of the flight status data when the main factor model is used to diagnose the engine fault or the criterion of engine fault indication. The conditions for recording the flight data and the indicators of data quality should be emphasized. All of these have yielded good results in improving the success rate of trend analysis and troubleshooting