What is the definition of 'on-condition maintenance'?

On-condition maintenance is defined as maintenance that is conducted based on the actual condition of the equipment rather than on a predetermined schedule. This type of maintenance relies on data, inspections, and monitoring to determine whether equipment is functioning within acceptable parameters or if it requires intervention. This approach helps ensure that maintenance activities are only performed when necessary, which can lead to improved efficiency, reduced downtime, and cost savings. It emphasizes the utilization of real-time data and can lead to more effective maintenance management, as it addresses potential issues before they escalate into more critical problems.

By contrast, routine maintenance performed on a fixed schedule does not take into account the current state of the equipment and may not be necessary if everything is functioning well. Maintenance that occurs only in emergencies can lead to unplanned outages and may not address underlying issues in a timely manner. Predetermined maintenance with no exceptions can be inefficient as it may result in unnecessary servicing of equipment that does not require it. Therefore, on-condition maintenance stands out as a proactive and efficient approach to maintaining aviation resources.