MTBF (Mean Time Between Failures)
A reliability metric for repairable assets — the average operating time between unplanned failures.
Definition
MTBF (Mean Time Between Failures) is the average operating time between two unplanned failures on a repairable asset. It is a leading indicator of asset reliability and PM program effectiveness.
The MTBF formula
MTBF = total operating time ÷ number of failures, over a chosen window.
Higher is better. MTBF applies to repairable assets. For non-repairable items (e.g. bearings), the equivalent concept is MTTF (Mean Time To Failure).
Why MTBF matters
MTBF trends reveal whether a PM program is working. A rising MTBF means failures are becoming less frequent. A falling MTBF — especially after a PM change — is an early signal that a strategy adjustment is needed.
How FacilityLane tracks MTBF
FacilityLane computes MTBF per asset and asset class using failure-tagged work orders. Pair it with MTTR to see both failure frequency and recovery time in one view, and use LAYLA to surface assets whose MTBF is trending in the wrong direction.
FAQ
Common questions about MTBF (Mean Time Between Failures).
In isolation, yes — but context matters. MTBF on an asset that rarely runs can look great while telling you nothing. Combine MTBF with utilization data for a reliable picture.
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