What type of system consists of three or more large, interconnected air cylinders for recharging small SCBA cylinders?

A cascade system is designed specifically to store and regulate high-pressure air for the purpose of recharging smaller self-contained breathing apparatus (SCBA) cylinders. This system utilizes three or more large interconnected air cylinders, which allows for a continuous supply of air. As smaller cylinders are filled from the cascade system, the higher pressure from the larger cylinders forces air into the smaller units.

The cascade system operates efficiently due to its ability to equalize pressure among the large cylinders, while also providing a quick and effective way to refill SCBA cylinders on the scene or at a fire station. It plays a crucial role in ensuring that firefighters have access to the necessary breathable air while operating in hazardous environments.

In contrast, the other choices do not accurately represent a system designed for recharging SCBA cylinders. An airborne system typically refers to operations involving air transport, a filling system is too vague and general, and a stationary dock doesn’t pertain to the specific purpose of providing a cascade of air for SCBA refill.