为提高飞机整机级系统安全性评估效果,在明确整机级系统安全性评估思想的情况下,详细描述了整机级系统安全性分析和整机级系统安全性验证的流程;运用故障树分析法和故障模式与影响分析法研究了能够满足整机级系统安全性要求的评估方法和关键技术。实例表明:整机级严酷等级评估方法能够定性地防止颠覆性的逻辑错误;功能故障树可以对安全性指标进行精确的分配和计算;结合故障树和故障模式与影响分析法而形成的两阶段指标分配法提高了个别安全性指标数值,但仍符合安全性要求。 In order to improve the aircraft-level system safety evaluation results, the safety analysis of the whole system-level system and the process of system-level system safety verification are described in detail, Analytical method and fault mode and influence analysis method are used to study the evaluation methods and key technologies that can meet the requirements of the whole system. The examples show that the machine-level severity rating method can qualitatively prevent disruptive logic errors; the functional fault tree can accurately allocate and calculate the safety indexes; and the two-stage method combining the fault tree with the failure mode and the impact analysis The indicator allocation method increases the value of individual safety indicators but still meets the safety requirements.