ABSTRACT
Complex systems need to be maintained to be able to continuously operate in working order because components wear out, cables stretch, bolts loosen, fluids become depleted or dirty, and critical elements fail. Preventive maintenance reduces the likelihood of such occurrences resulting in component failures or malfunctions during system operations. Systems generally undergo two types of maintenance, scheduled and unscheduled. Scheduled maintenance is preventive, intended to inspect and replace components, fluids, belts, etc., before they wear out or fail. Unscheduled maintenance is directed to repair equipment anomalies.
