Unplanned Maintenance
Unplanned maintenance is work that begins without sufficient preparation of scope, labor, parts, tools, access, or execution method.
What this term means in maintenance
Unplanned maintenance is work that begins without sufficient preparation of scope, labor, parts, tools, access, or execution method.
What unplanned maintenance includes
Unplanned maintenance often begins after an unexpected failure or urgent defect. The team may need to diagnose the problem, locate parts, arrange permits, and define the work while the asset is already unavailable.
Practical example
A conveyor stops because its gearbox fails. No spare gearbox is identified, the lifting arrangement has not been prepared, and the repair procedure is unclear. The team must plan while production is waiting.
Unplanned does not always mean unnecessary
Some failures cannot be economically predicted or prevented. The objective is not to eliminate every unplanned job, but to reduce avoidable unplanned work and improve readiness for likely failures.
Consequences
Excessive unplanned work can increase:
- Downtime
- Overtime
- Safety exposure
- Expedited-parts costs
- Schedule disruption
- Temporary repairs
- Repeat failures
Common mistake
Classifying a job as planned simply because it was entered into a CMMS before execution. Planning quality depends on preparation, not record-creation time.
Related concepts
Related maintenance terms
Keep exploring connected CMMS, reliability, and maintenance planning terms.
Reactive Maintenance
Reactive maintenance is work performed in response to an equipment problem after the condition is reported or the asset has already failed.
Emergency Maintenance
Emergency maintenance is immediate work required to control an unacceptable safety, environmental, quality, compliance, or production consequence.
Maintenance Backlog
Maintenance backlog is approved maintenance work that has not yet been completed, commonly measured by job count, estimated labor hours, age, risk, or weeks of available labor capacity.
Glossary FAQs
- Is all unplanned maintenance caused by breakdowns?
No. Urgent defects and unexpected inspection findings can also create unplanned work.
- Why is unplanned maintenance expensive?
It often creates downtime, overtime, expedited parts, schedule disruption, and inefficient diagnosis or preparation.
- Can all unplanned maintenance be eliminated?
No. The objective is to reduce avoidable unplanned work and improve readiness for remaining failures.