民机无线电导航设备安全性相关需求分析

Safety-Related Requirements Analysis of Civil Aircraft Radio Navigation Equipment

安全性相关需求作为民机需求的重要组成,与安全性评估过程紧密关联。介绍了民机的安全性评估过程,针对某型构架下的民机无线电导航设备,从功能危害状态分析出发,使用故障树(FTA)等分析手段,分析推导了包括应对失效的定量可用性需求、缓解设计错误的研制保证等级(DAL)需求及衍生需求等设备安全性相关需求。给出的安全性相关需求分析方法,符合SAE ARP 4754A、SAE ARP 4761等设计指南要求,对于高安全性要求的民机机载/地面设备的需求开发与确认具有重要的参考意义。

As an important component of civil aircraft requirements,safety-related requirements are closely related to the safety assessment process.The safety assessment process of civil aircraft is introduced,and safety-related requirements of avonics for a certain system configuration is analyzed,which starts from the function hazard analysis and utilities safety analysis methods such as Fault Tree Analysis(FTA);the deduced safety-related requirements include probabilistic item availability requirements for hardware failure,Development Assurance Level(DAL)requirements for mitigating design errors,and other derived requirements.The analysis method of safety-related requirements complies with SAE ARP 4754A,SAE ARP 4761 and other design guidelines,and has important reference significance for the requirements development and validation of airborne and ground equipment of civil aircraft with high safety targets.