Which description matches condition-based maintenance (CBM)?

• A. Maintenance triggered by a fixed calendar.
• B. Maintenance performed only after a major failure.
• C. Maintenance triggered by data indicating equipment health rather than on a fixed calendar.
• D. Maintenance that is no longer necessary.

Answer: (C)

Condition-based maintenance is about acting on the actual state of the equipment, using monitored data to trigger service when health indicators show degradation. Sensors track things like vibration, temperature, oil analysis, or wear trends, and maintenance is scheduled when those indicators reach predefined thresholds. This approach aims to prevent failures while avoiding unnecessary work that would happen on a fixed calendar.

That’s why the description that matches CBM is the one where maintenance is triggered by data indicating equipment health rather than on a fixed calendar. In contrast, a fixed calendar acts on time regardless of condition, waiting for a major failure is reactive, and maintenance being no longer necessary is not a valid concept for ongoing operations.