What characterizes an out of service fire protection system?

An out-of-service fire protection system is characterized by not being in good working order. This implies that the system cannot perform its intended function of detecting or suppressing fires, which can arise from hardware failures, maintenance issues, or damage incurred over time. When a fire protection system is deemed out of service, it means that there is a significant risk during the period it cannot operate effectively, highlighting the necessity for alternative safety measures or immediate repairs.

The other options describe conditions that indicate a system is operational or being properly maintained, which is contrary to the definition of “out of service.” A fully functional and operational system indicates that it serves its purpose effectively, while regular scheduled maintenance ensures that systems remain operational over time. Temporarily disconnecting a system for inspections suggests it may still be operational, as it only implies a short-term non-usage rather than a failure of components or overall system performance.