What is a characteristic of the aircraft's fuel system?

A gravity-fed fuel system utilizes the force of gravity to move fuel from the tank to the engine, typically found in low-wing aircraft designs. This type of system is straightforward and reliable, as it doesn't rely on electrical pumps or pressurization, reducing the risk of mechanical failure. Gravity feeding is beneficial in simpler aircraft, where the weight and complexity of additional mechanical systems can be avoided, allowing for more straightforward operation and maintenance.

The other options present characteristics applicable to different aircraft designs. For instance, an electric pump-fed system is used in high-performance or complex aircraft where positive fuel delivery is necessary, particularly under certain flight conditions. Multiple fuel tanks are often found in larger, more advanced aircraft to balance weight and increase range; however, not all aircraft employ this setup. A pressurized fuel system is utilized in some high-performance aircraft to ensure consistent fuel delivery at various altitudes, but this adds complexity and requires additional maintenance. Each variation serves its purpose depending on the design and operational requirements of the aircraft.