mean-time-to-repair is a reliability metric that quantifies the average duration from the moment a system component fails to the moment it is fully restored to operational status. It is calculated by dividing total maintenance downtime by the number of failures over a defined period. The metric drives maintenance planning, spare-parts inventory, and staffing decisions. Its boundary is set by the repair action itself—from fault detection through diagnosis, physical repair or replacement, and verification of restored function. [formal: media temporis ad reparandum | substrate: behavior | horizon: hours | explicit: yes | epoch: 0.01]
Accepted ontology entry
mean-time-to-repair
mean-time-to-repair is a reliability metric that quantifies the average duration from the moment a system component fails to the moment it is fully restored to operational status. It is calculated by dividing total maintenance downtime by…
Definition
Why it is in scope
mean-time-to-repair is a human-made metric used in reliability engineering to quantify the average time required to repair a failed component and restore system functionality. It is calculated from maintenance logs and serves as a key performance indicator for maintenance operations.
Names and aliases
- mean-time-to-repairen · CANONICAL
Relations from this entry
- cmrwiv1rn00a8soacg5vdpiogINSTANCE_OF →
mean-time-to-repair is a specific kind of metric: it quantifies the average time to repair a failed component. A competent speaker would call MTTR 'a metric.' Files against the nearest general kind per Law 9.
- cms7wyk72004ph6s8d82lhwqlSERVES →
MTTR exists to sustain reliable operation. Its designed purpose is to measure and minimize downtime, which directly supports reliability. Law 8d: the servant (MTTR) points at the master (reliability).
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No accepted relations in this direction.
Record identity
- Created
- Aug 7, 2026, 1:32 PM UTC
- Content hash
- 737567950c431de515f50ea21acda55ee457efa24ce69e36c3adc0620f27fdf9