What does the term "down equipment" refer to in maintenance?

The term "down equipment" specifically refers to equipment that is unable to function and is out of service, requiring maintenance or repair to restore its operational capability. In the context of maintenance management, identifying down equipment is crucial because it helps prioritize repair efforts and allocate resources effectively to minimize downtime.

When equipment is categorized as "down," it indicates that it is not just inactive but needs specific attention to fix issues preventing it from being operational. Recognizing this term is vital in ensuring proper maintenance protocols are followed and that the necessary corrective actions are taken promptly to return the equipment to a functional state.

The other options relate to equipment in different states, such as being regularly checked without maintenance, being due for replacement, or being surplus, but they do not encompass the definition of "down equipment" which centers specifically on non-operational status requiring repair.