🔍 Key Concepts

• Difference between condition-based maintenance and planned (time-based) maintenance • What information is used to schedule maintenance before problems occur • How manufacturers specify service intervals for machinery

💭 Think About

• Which option gives you a clear, predictable number you can use to schedule maintenance tasks on a calendar or work list? • Which options are more about detecting an existing or developing problem rather than simply deciding when to do routine service? • Think about how most shipboard planned maintenance systems (PMS) actually trigger a job—what basic parameter do they track?

✅ Before You Answer

• Identify which choice is a direct, primary trigger for standard PMS jobs (like overhauls, filter changes, inspections). • Separate methods that monitor condition (diagnostics) from those that schedule maintenance. • Consider which factor is most commonly specified in manufacturer maintenance manuals as the main service interval basis.