Space Shuttle critical function audit

A large fault-tolerance model of the main propulsion system of the US Space Shuttle has been developed. This model is being used to identify single components and pairs of components that will cause loss of Shuttle critical functions. In addition, this model is the basis for risk quantification of the shuttle. The process used to develop and analyze the model is digraph matrix analysis (DMA). The DMA modeling and analysis process is accessed via a graphics-based computer user interface. This interface provides coupled display of the integrated system schematics, the digraph models, the component database, and the results of the fault tolerance and risk analyses.<>