Which category of maintenance is performed according to a predetermined schedule?

Preventative maintenance is performed according to a predetermined schedule to ensure that equipment and systems are kept in good working order and to prevent unexpected failures. This type of maintenance includes routine inspections, servicing, and repairs that are planned based on time intervals or usage metrics. By adhering to a schedule, organizations can proactively manage their equipment, reduce downtime, improve reliability, and extend the lifespan of their assets. This approach is key to maintaining safety and efficiency in operations.

In contrast, proactive maintenance focuses on identifying and addressing potential issues before they lead to failures, but it is not strictly tied to a specific schedule. Corrective maintenance is reactive and occurs after equipment has already failed, addressing issues that have already arisen. Emergency maintenance is unplanned work that is performed in response to critical failures or hazardous situations that require immediate attention.