民用飞机高升力控制系统安全性评估方法浅析

摘要

It introduces the processes and methods for the safety assessment, proposes the analysis items in the stage such as the Functional Hazard Analysis( FHA) , Preliminary System Safety Assessment( PSSA) and System Safety Assessment( SSA) , discusses the assessment method at various stages.Based on the above safety assess-ment methods, it takes a type of civil aviation aircraft as an example, carries out functional hazard analysis, de-fines all function failure in the system process.Based on the extent of failure damage, it classifies these failure, establishes the failure trees according to 1 class function, carries PSSA and SSA, verifies that the system design satisfies the requirement of safety index.%对系统安全性评估的流程和方法进行了研究，分析了功能危害性评估（ FHA）、初步安全性评估（ PSSA）、系统安全性评估（ SSA）3个阶段内容，并探讨了各阶段运用的评估方法。基于以上安全性评估方法，对某民机高升力控制系统进行FHA，确定了系统可能发生的所有功能失效故障，然后按失效故障危害影响程度对这些失效故障进行了分类。以其中一项Ⅰ类功能故障为例建立故障树，对其开展了PSSA和SSA，验证了系统设计满足安全性指标要求。