Definition
Planned downtime is the actual measured stop time attributable to a scheduled, agreed reason (a maintenance window, changeover, or shutdown) as opposed to unplanned downtime, which results from an unexpected failure. It is a component of total downtime used in availability and OEE calculations.
Key facts
- Measures actual stop time for a scheduled reason, distinct from the maintenance window, which is the time made available rather than the time consumed.
- Contrasted with unplanned downtime, which results from unexpected failures rather than an agreed schedule.
- A defined component of availability and OEE calculations: how planned downtime is bounded affects both metrics' comparability.
- Includes changeovers and non-maintenance planned stops in many definitions, not only maintenance work.
How is Planned downtime calculated?
Planned downtime measures the actual time an asset was stopped for an agreed, scheduled reason (recorded against the specific event, whether that was maintenance work, a product changeover, or a planned shutdown) so it can be separated from unplanned stop time in reliability and production reporting.
What influences Planned downtime?
A maintenance window is the time made available for maintenance work in advance; planned downtime is the measured time actually consumed once the stop occurs, which may be less than, equal to, or (if work overruns) more than the original window.
FAQ
Frequently asked questions
Which portion of downtime is planned in advance?
Planned downtime: the measured stop time attributable to a scheduled, agreed reason such as maintenance or changeover, as opposed to unplanned downtime caused by an unexpected failure.
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