Certified Maintenance & Reliability Professional (CMRP) Practice Exam

What is the suggested proportion of time-based PMs among all PMs?

1. About 10%

2. About 20%

3. About 30%

4. About 40%

The correct answer is: About 30%

The suggested proportion of time-based preventive maintenance (PM) among all PMs is approximately 30%. This recommendation is based on the principle that maintenance strategies should primarily focus on a balanced approach, integrating both time-based and condition-based PMs. Time-based maintenance involves performing maintenance tasks at regular intervals regardless of the actual condition of the equipment. This type of maintenance is essential for certain equipment where knowing the right timing for maintenance activities can help avoid unexpected failures. However, it is crucial to also incorporate condition-based maintenance (which adjusts maintenance frequency based on the actual state of the equipment) to optimize resources and minimize downtime or unnecessary work. A proportion of about 30% for time-based PM recognizes the importance of scheduled maintenance while encouraging organizations to invest in condition-based strategies, allowing for responsive actions based on the real-time performance and condition of equipment. This balance can lead to better reliability, efficiency, and cost-effectiveness in maintenance practices, maximizing asset utilization while meeting safety and operational standards.