Also known as unpredictable occurs when equipment actually suffers a breakdown that often results in downtime.

This unplanned maintenance can be the result of premature parts failure or failure to monitor equipment performance. Either way, it tends to be chaotic because repair procedures are emergency.

Planned, or predicted, correction is the type that occurs when a drop in equipment performance is detected. Interventions are therefore non-emergency and can be scheduled.

However, while the machine is running at lower performance, it is lost in two ways. First, there is the drop in productivity due to poor performance. And finally, the machine in question is virtually a ticking time bomb, meaning it can stop at any time.

Corrective maintenance of machinery in Peru is usually planned but can also occur by managerial choice.