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availability
Definition
ability of an item to be in a state to perform a required function under given conditions at a given instant of time or over a given time interval, assuming that the required external resources are providedNotes
- NOTE 1 This ability depends on the combined aspects of the reliability performance, the maintainability performance and the maintenance support performance.
- NOTE 2 Required external resources, other than maintenance resources do not affect the availability performance of the item.
- NOTE 3 When referring to the measure for availability, the preferred term is 'instantaneous availability'.
- NOTE 4 Adapted from IEC Multilingual Dictionary: 2001 edition.
Relations
- ECSS-S-ST-00-01C — function
- ECSS-M-ST-10C Rev. 1 — function
- ECSS-Q-ST-10-09C Rev. 1 — major nonconformances
- ECSS-E-ST-70C — mission
- ECSS-E-ST-70-11C — observability
- ECSS-E-ST-70-11C — operability
- ECSS-Q-ST-20-10C — RAM
- ECSS-Q-ST-30-09C — RAM
- ECSS-E-ST-10C Rev.1 — RAMS
- ECSS-E-ST-35C Rev. 1 — RAMS
- ECSS-E-ST-20-08C Rev. 1 — RAMS
- ECSS-Q-ST-30-02C — RAMS
- ECSS-Q-ST-10-09C Rev. 1 — RAMS
- ECSS-S-ST-00-01C — RAMS
- ECSS-E-ST-50-15C — redundant bus
- ECSS-E-ST-10-03C — residual life
- ECSS-Q-ST-30-09C — steady-state availability (asymptotic availability)
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