What are the four types of maintenance?

• A. Preventative, Corrective, Predictive, Reliability Centered
• B. Preventative, Corrective, Predictive, Reactive
• C. Preventive, Corrective, Predictive, Risk-Based
• D. Preventive, Corrective, Predictive, Proactive

Answer: (A)

Maintenance strategies determine when and how to service equipment to prevent failures and manage risk and cost. The four commonly recognized types are preventive maintenance, corrective maintenance, predictive maintenance, and Reliability Centered Maintenance. Preventive maintenance involves scheduled tasks designed to prevent failures before they happen. Corrective maintenance is performed after a failure to restore service. Predictive maintenance uses data from monitoring equipment condition to estimate remaining useful life and schedule maintenance just in time. Reliability Centered Maintenance applies a systematic analysis of functions, failure modes, and consequences to decide the most effective maintenance tasks, often guiding and optimizing the use of the other strategies. The other options swap in reactive, risk-based, or proactive ideas, which aren’t the standard fourth type alongside preventive, corrective, and predictive maintenance in this framework.