Certified Maintenance & Reliability Professional (CMRP) Practice Exam

What does the 10% rule imply for time-based PM on critical assets?

1. It must be completed within 10% of its scheduled frequency

2. It should have no deadline

3. It can be skipped if not necessary

4. It should occur bi-annually

The correct answer is: It must be completed within 10% of its scheduled frequency

The 10% rule in the context of time-based preventive maintenance (PM) for critical assets indicates that maintenance tasks should be completed within 10% of their scheduled frequency. This rule highlights the importance of adhering closely to maintenance schedules to ensure reliability and performance of critical equipment. By allowing a small margin (10%), organizations can accommodate minor discrepancies in scheduling without compromising the effectiveness and integrity of maintenance practices. This approach helps ensure that critical assets receive timely attention, thereby minimizing the risks associated with equipment failures or operational downtime. The focus on maintaining a strict schedule is crucial in industries where asset reliability directly impacts productivity, safety, and costs. In contrast, other options do not reflect the structured maintenance philosophy required for critical assets. For instance, having no deadline undermines the purpose of scheduled maintenance, potentially leading to neglect. Skipping maintenance outright can result in increased risk of failure for critical assets. Lastly, specifying a particular frequency like bi-annually does not provide the flexibility necessary to adjust for specific operational conditions or asset needs, limiting the adaptability of the maintenance program.