Impromptus maintenance service that is required due to a failure is referred to as what?

The term that describes impromptu maintenance service required due to a failure is unscheduled maintenance. This type of maintenance occurs unexpectedly and usually arises from unforeseen equipment or system failures that need immediate attention to restore functionality. Unscheduled maintenance often tackles urgent repairs, preventing further damage and ensuring safety and operational efficiency.

In contrast, scheduled and preventive maintenance involve pre-planned activities designed to maintain equipment and prevent failures from occurring in the first place. Emergency maintenance is similar to unscheduled maintenance but often refers specifically to situations that require immediate action due to safety concerns or critical operations being jeopardized. Thus, while all these terms are related to maintenance practices, unscheduled maintenance uniquely addresses the reactive nature of dealing with unexpected failures.