Maintainability
Maintainability is the ability of an asset to be inspected, serviced, diagnosed, repaired, and restored within a required time using defined resources and procedures.
What this term means in maintenance
Maintainability is the ability of an asset to be inspected, serviced, diagnosed, repaired, and restored within a required time using defined resources and procedures.
What influences maintainability
Maintainability depends on:
- Physical access
- Modularity
- Diagnostic information
- Standard components
- Lifting and handling arrangements
- Isolation points
- Tool requirements
- Work instructions
- Technician skill
- Spare-parts availability
Practical example
Two pumps have similar reliability, but one can be removed using a dedicated lifting beam and quick-disconnect arrangement. The other requires extensive piping removal. The first design has better maintainability.
Why maintainability matters
Improved maintainability can reduce:
- Repair time
- Safety exposure
- Production downtime
- Labor demand
- Human error
- Damage during maintenance
Relationship to MTTR
MTTR can provide evidence of maintainability, but it is also affected by waiting for parts, approvals, and organizational delays.
Common mistake
Focusing only on component reliability during equipment purchase can create assets that are difficult and unsafe to maintain.
Related concepts
Related maintenance terms
Keep exploring connected CMMS, reliability, and maintenance planning terms.
Mean Time to Repair
Mean Time to Repair, or MTTR, is the average time required to restore a repairable asset after failure.
Equipment Availability
Equipment availability is the percentage of required or scheduled time during which an asset is capable of performing its intended function.
Maintenance Job Plan
A maintenance job plan is a reusable definition of the labor, steps, parts, tools, safety controls, references, and completion requirements for a maintenance task.
Glossary FAQs
- What is maintainability?
It is the ability to inspect, service, diagnose, repair, and restore equipment within a required time.
- How is maintainability related to MTTR?
Better maintainability can reduce repair time, but MTTR also includes organizational and waiting delays.
- Can maintainability be improved after installation?
Yes. Access, lifting, isolation, tooling, job plans, diagnostics, and modularity can often be improved.