Which term is used for a test performed before a vehicle is placed into service?

• A. Pressure governor
• B. Pumper
• C. Slow operating valve
• D. Preservice test

Answer: (D)

Preservice testing is the process of verifying all systems on a vehicle are functioning correctly before it goes into service. This check is done after construction, major repairs, or equipment changes to ensure safety and reliability for daily duty. It covers critical functions like pumps, hydraulics, brakes, electrical systems, lights, and sirens so the apparatus is ready for frontline use. The other terms don’t describe a testing process: a pressure governor is a device that regulates engine speed, a pumper is a type of apparatus, and a slow operating valve refers to a valve with delayed action, not a test.