Mean Fault Detection Time

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MFDT

expected time needed to detect a fault

Note 1 to entry: The MFDT is the time a) in Figure 5, Figure 6 and Figure 7.

Note 2 to entry: The MFDT is equal to zero for immediately revealed failure; (see Figure 6) generally negligible for

quickly detected failures; (see Figure 6) depending of the test policy for the hidden failures. In this case it may be

the main part of the item down time (see Figure 7).

Note 3 to entry: The MFDT used in this Technical Report should not be mixed-up with the mean fractional dead

time which has the same acronym.

FIG.5

FIG.6

FIG.7

Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global Standards

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