Which statement describes the difference between routine inspections and fault-specific inspections?

• A. They are the same; term is interchangeable.
• B. Routine inspections are optional; fault-specific are mandatory.
• C. Routine inspections are casual checks without defined intervals.
• D. Routine inspections are scheduled at defined intervals; fault-specific inspections occur due to abnormal conditions or events.

Answer: (D)

Routine inspections are planned and carried out at defined intervals as part of the preventive maintenance program. They’re scheduled checks that help ensure systems stay within specification before any issues arise. Fault-specific inspections, on the other hand, are triggered by abnormal conditions or events—such as a fault code, unusual performance, or after an incident—and are performed as needed to diagnose and address the particular problem.

So the correct statement captures that routine inspections happen on a schedule, while fault-specific inspections occur in response to an abnormal condition or event. The other ideas don’t fit because routine checks are not optional and are not casual; they are defined and mandatory in the maintenance program, and fault-specific inspections are not routine—they aren’t defined by a schedule but by a fault or event.