Safe allocation of avionics shared resources

We propose an approach to analyse the safety of avionic systems that takes into account the impact of computation and communication resource sharing. The approach is made of three main steps: use a formal notation to describe how failures propagate in the system under study, use model-checking tools to verify safety requirements and to derive allocation constraints, use a constraint solver to generate safe allocations. This approach is illustrated by the study of the Terrain Following/Terrain Avoidance (TF/TA) System of a fighter aircraft.