MTTR measures how long a failure actually costs you once it happens — the clock usually starts at fault report and stops when the asset is verified back in production, covering diagnosis, travel to the asset, the repair itself, and testing.
A low MTTR doesn't mean assets fail less often; it means your team finds, diagnoses and fixes failures fast when they do. That distinction matters because MTTR and MTBF answer different questions and get confused constantly — MTBF is about failure frequency, MTTR is about recovery speed.
What actually moves MTTR
In practice, MTTR is driven less by technician skill and more by whether the information needed to fix the fault fast is already where the technician is standing:
- Diagnosis time — whether the failure history, wiring diagrams and known-fault patterns for this exact asset are one search away, or buried in a filing cabinet
- Parts availability — whether the spare is on the shelf or on order, which is why MRO inventory accuracy shows up directly in MTTR trends
- Work order routing — how long a fault sits unassigned before a technician with the right skill set picks it up