Node A6 · Acronym decoder
MTTR
Mean Time To Repair
What it actually means
The average time to restore a failed system to operation — the headline maintainability metric, driven by fault detection and isolation time, accessibility, spares availability, and task design. Paired with MTBF it determines availability: a system that fails rarely but takes weeks to fix can still be unavailable when needed.
Where you'll meet it
Maintainability requirements and demonstrations, availability calculations.