Which statement best describes the function of aircraft fuel systems?

Which statement best describes the function of aircraft fuel systems?

• A. All of the above
• B. Store fuel
• C. Supply to engines
• D. Supply to APU

Answer: (A)

The fuel system is designed to keep fuel available where and when it’s needed, in the right condition, for both propulsion and power. Fuel is stored in tanks and then moved through pumps and lines to where it’s required. For engines, pumps and a control/metering unit regulate the flow and pressure to ensure the engines receive the correct amount of fuel across all throttle settings. The APU also needs a reliable fuel feed from the same tanks through its own pump and line so it can start and run when the engines aren’t operating. Since these duties—storing fuel and supplying it to both engines and the APU—are all handled by the fuel system, the best description is that it stores fuel and supplies to the engines and to the APU.

The fuel system is designed to keep fuel available where and when it’s needed, in the right condition, for both propulsion and power. Fuel is stored in tanks and then moved through pumps and lines to where it’s required. For engines, pumps and a control/metering unit regulate the flow and pressure to ensure the engines receive the correct amount of fuel across all throttle settings. The APU also needs a reliable fuel feed from the same tanks through its own pump and line so it can start and run when the engines aren’t operating. Since these duties—storing fuel and supplying it to both engines and the APU—are all handled by the fuel system, the best description is that it stores fuel and supplies to the engines and to the APU.