Aerospace Recommended Practice (ARP) was developed in the context of Federal Aviation Regulations (FAR) and Joint Airworthiness Requirements (JAR). System development process model was introduced by ARP 4754. In this model, safety assessment progress and system development process interact with each other [3]. This kind of development assurance establishes confidence that system development has been accomplished in a sufficiently disciplined manner to limit the likelihood of development errors that could impact aircraft safety. As to system safety analysis, ARP 4761 was developed as a document of standards for safety analysis [4]. System safety assessment (SSA) is an essential step in the process of system safety analysis according to ARP 4761. SSA verifies whether the safety requirements are met in the implemented design.
Sensitivity analysis is an essential tool in the process of SSA. Firstly, at design stage, there is unavoidable lack of detailed information about the system. Furthermore, detailed mathematical model of interaction between engine and its operation environment is not feasible at this stage. It is desired to identify the most