Maintenance performed once a deficiency occurs in the pavement; e.g., pothole filling or spall repair.
Maintenance work intended to correct an existing problem (as opposed to preventive maintenance which is intended to prevent future problems)
A call out, or engineer attendance to correct a fault.
maintenance performed to correct faults in hardware or software [ IEEE 90].
Maintenance performed to correct faults in hardware or software system.
All maintenance performed to correct a break down or failure.