Preventive Maintenance is defined as: Maintenance tasks, including inspection, service and or replacement, conducted at...

Preventive Maintenance is defined as: Maintenance tasks, including inspection, service and or replacement, conducted at regular, scheduled intervals of calendar or operating time established to avoid failure based on average statistical anticipated lifetime.

There are cautions regarding the application of PM: No more than "A" percent of total failures are time based, wear out, in nature. .... thus. PM is an ineffective avoidance action for about *'B" percent of probable failures.