| event characterized by the transition from the operating state, or the stand-by state, or the idle state to the outage of one or more items
NOTE 1 – The outage occurrence comprises one or more simultaneous or sequential transitions resulting in the outage of one or more items.
NOTE 2 – The outage occurrence is a failure if the resulting outage is a fault.
NOTE 3 – In French, the term “état d'indisponibilité” is used in the field of electric power systems with the meaning of "état d'incapacité" (in English "disabled state" or “outage”) used in other fields.
NOTE 4 – See figure 191-25.
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