FTA Evaluation

Precondition: The FTA has to be completed until the base events.

1. Right-click on the desired gate.

2. Choose Calculate probabilities.

Outcome: the probability of failure for every gate and event will be calculated. You can see the probability of failure of the undesired event and the input failure event probabilities in the minimal cut sets view.

The following reliability equations are used to calculate the probability of failure for the base events
(component failure):

Open

where
R = Probability of success (Reliability)
Q = Probability of failure
λ = Component failure rate
T = Time interval (mission/component life time or exposure time [h])