中文摘要：

飞行数据记录设备（FDR）的使用为飞行安全的定量评价提供了必要的数据支撑，该文通过对FDR数据中与发生受控撞地飞行风险相关的飞行参数的统计分析，构建了以FDR数据为基础并结合专家知识规则的飞行安全风险指数计算模型，提出了一种基于飞行参数超限频率和强度的飞行安全风险指数，并用以标示飞行安全相对水平的方法，给出了风险指数的数学定义及其计算方法。

英文摘要：

Through the analysis of FDRs data relative to the risk of controlled flight to terrain （CFIT）, the framework of a quantified model to assessment CFIT risk based on FDR data is introduced. It is a computer model that uses the both exceeding data from the FDRs and knowledge based rules from safety experts to quantify the risk of an incident and/or accident by risk indicators. The mathematics definition of the risk indicator and its computing method are given.