Where does the APU get its fuel supply?

Where does the APU get its fuel supply?

• A. Left collector tank
• B. Right collector tank
• C. Main fuel line
• D. Auxiliary tank

Answer: (A)

Fuel for the APU comes from the left collector tank because the APU needs a dedicated, isolated feed that’s reliable even when the main engines are off or when fuel transfer within the wings is changing. The left collector tank feeds the APU through its own pump and valve, keeping the APU’s supply independent from the engine fuel lines and preventing crossfeed issues. The main fuel line is designed to feed the engines, not to provide a guaranteed APU supply, and the auxiliary tank is used for extra fuel storage rather than as the standard APU source. So the left collector tank is the correct source to ensure a stable, controllable APU fuel supply.

Fuel for the APU comes from the left collector tank because the APU needs a dedicated, isolated feed that’s reliable even when the main engines are off or when fuel transfer within the wings is changing. The left collector tank feeds the APU through its own pump and valve, keeping the APU’s supply independent from the engine fuel lines and preventing crossfeed issues. The main fuel line is designed to feed the engines, not to provide a guaranteed APU supply, and the auxiliary tank is used for extra fuel storage rather than as the standard APU source. So the left collector tank is the correct source to ensure a stable, controllable APU fuel supply.