| time interval for which the item is in a down state
NOTE 1: All times mentioned in the figure are time intervals or sequences of time intervals.
NOTE 2: Each time interval can be defined as required time (IEV 192-02-08) or as non-required time (IEV 192-02-09).
NOTE 3: In some cases, it may be possible to perform some maintenance when an item (IEV 192-01-01) remains functioning as required, see also on-line maintenance (IEV 192-06-30). To keep Figure 1 simple, the time associated with such maintenance is not addressed in the figure.
IEV Part 192 - Figure 1 - Time intervals related to operation and maintenance
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