Fault Propagation for Single Fault Source in Avionics

With the rapid development of the civil aviation industry, aircraft has become an important means of transportation for people to travel daily. However, when the aircraft fails, due to its multiple layers and complex structure, the faults do not usually exist alone, but have mutual influences. The complexity of various fault propagations during troubleshooting is complex. The relationship brings certain difficulties to maintenance personnel in locating and diagnosing faults. This paper takes the avionics system as the research object, adopts the fault propagation directed graph method to model the fault in the avionics system, and presents the directed graph model in the form of a matrix to study the propagation of the fault. Evaluate the indicators of fault propagation, and through the analysis of fault propagation directed graphs, eventually achieve the purpose of finding the fault propagation path. Taking the B777 aircraft as an example, a directed graph model of the wing (partial) electronic fault is constructed, and a fault is assumed. By comparing the intensity of the fault propagation of the directed edge, the most probable propagation path of the fault is obtained.