Maintenance 23
Maintenance 23 : The organized activity, both administrative and technical, of keeping structures, systems and components in good operating condition, including both preventive and corrective (or repair) aspects. Corrective Maintenance: Actions that restore, by repair, overhaul or replacement, the capability of a failed structure, system or component to function within acceptance criteria. Contrasted with preventive maintenance. Periodic Maintenance: Form of preventive maintenance consisting of servicing, parts replacement, surveillance or testing at predetermined intervals of calendar time, operating time or number of cycles. Also termed time based maintenance. Planned Maintenance: Form of preventive maintenance consisting of refurbishment or replacement that is scheduled and performed prior to unacceptable degradation of a structure, system or component. Predictive Maintenance: Form of preventive maintenance performed continuously or at intervals governed by observed condition to monitor, diagnose or trend a structure, system or component's condition indicators; results indicate present and future functional ability or the nature of and schedule for planned maintenance. Also termed condition based maintenance. Preventive Maintenance: Actions that detect, preclude or mitigate degradation of a functional structure, system or component to sustain or extend its useful life by controlling degradation and failures to an acceptable level. Preventive maintenance may be periodic maintenance, planned maintenance or predictive maintenance. Contrasted with corrective maintenance. Reliability Centred Maintenance (RCM): A process for specifying applicable preventive maintenance requirements for the safety related systems and equipment in order to prevent potential failures or to control the failure modes optimally. The RCM utilizes a decision logic tree to identify the maintenance requirements according to the safety consequences and operational consequences of each failure and the degradation mechanism responsible for the failures
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