ABSTRACT
In any aircraft design scenario, there are multiple goals which need to be achieved.Therefore, it is important to be able to screen the design space for a set of promising design alternatives for further studies. The goals are also often contradictory and need to be balanced. In a design decision making process, engineers must trade-off widely differing concepts to realize a result which maximizes their overall preference for a design. These concepts are usually incommensurate: for example, they could be as different as cost, degree of safety, degree of manufacturability, or amount of various performance indicators: stress, heat dissipation, etc. (Johansson 2013). However, a strategic issue for any industrial company is to conceive safe and reliable systems while performing all systems’ intended functions at a minimum cost. Reliability uses models (such as block diagrams and fault trees) to provide a graphical means of evaluating the relationships between different parts of the system (Marvin et al. 2004 & O’Connor et al. 2002). System safety is a basic requirement of the total system. The goal is to optimize safety by identifying safety-related risks, eliminating or controlling them by design and/or procedures,
based on acceptable system safety precedence (Stephans 2004).
