What is unplanned downtime?

The stops nobody scheduled — the number reliability work exists to shrink.

Unplanned downtime is production time lost to failures and unexpected stops — as opposed to planned downtime for changeovers, PMs or scheduled shutdowns. It's the costliest kind because it arrives unstaffed, unprepared and usually at the worst moment.

Teams track unplanned hours by line and failure cause. It's the denominator behind most maintenance ROI: cutting unplanned stops is what condition monitoring, PM and spares readiness are all for.

• How it's used