Predictive tasks entail checking items or components if something is failing.
Preventive maintenance means overhauling items or replacing components at fixed intervals. He is managing director of Aladon Ltd., Lutterworth, UK, a company which together with a worldwide network of licensees has helped maintenance and operating personnel apply RCM at over 700 sites in 37 countries. Corrective maintenance means fixing things either when they are found to be failing or when they have failed. However, there is a whole family of maintenance tasks which falls into none of these categories. For example, when we periodically activate an alarm, we are not checking if it is failing.