Immediately Revealed Failure

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overt failure

detected failure

evident failure

failure which is immediately evident to operations and maintenance personnel as soon as it occurs

Note 1 to entry: The immediately revealed failures show themselves immediately, but the hidden failures which

are quickly detected by specific diagnostic tests are generally considered as immediately revealed failures.

Note 2 to entry: The repair of immediately revealed failures may begin immediately after they have occurred.

Note 3 to entry: The failures which are detected by periodic tests are not considered as immediately revealed failures.

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

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