Which statement best differentiates preventive maintenance from predictive maintenance in AMQS?

• A. Preventive maintenance is time- or usage-based; predictive maintenance uses data trends to predict failures and optimize intervals.
• B. Predictive maintenance is time- or usage-based.
• C. Preventive maintenance uses data trends to predict failures and optimize intervals.
• D. Predictive maintenance is based on random inspections.

Answer: (A)

The key idea is that preventive maintenance follows a fixed schedule based on time or usage, while predictive maintenance uses data from monitoring and trend analysis to forecast when a failure will occur and adjust the maintenance interval accordingly. This means preventive tasks are planned ahead of time on a calendar or activity basis, whereas predictive tasks are driven by actual condition data to optimize when maintenance is done.

So, the best statement is that preventive maintenance is time- or usage-based, and predictive maintenance uses data trends to predict failures and optimize intervals. This captures the fundamental difference: fixed scheduling versus data-driven prognosis.

The other notions—predictive being just time- or usage-based, preventive using data trends to predict failures, or predictive relying on random inspections—don't fit the real distinction. Predictive is not fixed-interval timing and preventive isn’t based on data trends for prognosis.