Detected Failure Probability - The portion of an item'srelative failure probability that has been detected by a given detection test or detection sequence. An item's detected failure probability can be calculated by adding up the relative failure probabilities for all functions/failure modes of that item that have been detected by the given test(s):
The detected failure probability associated with a given item in a given fault group can be calculated using the following equation:
where
Ix
=
the item for which the detected failure probability is to be calculated
N
=
the total number of functions/failure modes associated with Ix
Xi
=
1 ifthe ith function/failure mode of Ix has been detected by the specified detection test or detection sequence; 0 otherwise
Note: When calculating the detected failure probability for detection tests/sequences that utilize hybrid diagnostics, the corresponding partial failure probabilities are summed for each detected element (function or failure mode), the failure probabilities for each object having been adjusted based on the selected failure probability calculation method.
