Instantaneous Availability

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3.1.11

point availability

A(t)

probability for an item to be in a state to perform as required at a given instant

Note 1 to entry: In this Technical Report the word “availability” used alone stands for “instantaneous availability”.

Note 2 to entry: This is a time-dependent parameter.

Note 3 to entry: No matter if the item has failed before the given instant if it has been repaired before.

Note 4 to entry: For non-repairable items, Availability and Reliability are identical.

Note 5 to entry: When dealing with safety, A(t) is generally close to 1 and this property is used to develop

approximated formulae (see Clause 7).

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

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