Fault Tree Analysis
Fault tree analysis (FTA) is a deductive, top-down method of analyzing system design. It is considered one of the best methods for systematically identifying and graphically displaying the many ways something can go wrong. First, you specify an undesirable top event. Then you identify all of the components in the system that could cause that top event. The components can contribute failure probabilities. You can use Boolean logic to describe the relationship between the components. This method enables you to describe a complex system in much the same way as a digital electronic logic circuit.
Generally, you do FTA graphically by using a Boolean logic structure of AND and OR gates (FIGURE D-1 and FIGURE D-2). To describe very ...
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