Maintenance operations aimed at maintaining the expected efficiency and performance values in systems, usually carried out after the cycle of the Perfective Tests, their objective is to prevent the reduction of the parameters of efficiency and system performance, Using the indicators obtained from the last perfective maintenance, as many preventive programmes can be programmed as the stability of the efficiency and performance parameters allows. Preventive maintenance generally generates alarms to perform repairs, support or technical assistance to systems well in advance of the dates of possible failures.
