Using the value of the probability of failure of the top event, a reverse fault tree analysis is conducted
to determine the required probabilities of the root events. The probability of failure of a root event is
then used to estimate the time interval between consecutive inspection/maintenance tasks. Using this
analysis, we were able to determine the values for the time intervals between consecutive maintenance tasks
of 41 days for external accessories such as fan belts, etc., and 75 days for internal accessories such as fan
bearing, etc.