Fuel is normally supplied to an APU from

Fuel is normally supplied to an APU from

• A. The airplane's main fuel supply.
• B. A separate APU fuel tank.
• C. Ground support fuel.
• D. The auxiliary power unit's own internal fuel

Answer: (A)

Fuel for the auxiliary power unit is drawn from the airplane’s main fuel system through a dedicated APU fuel line and pump. This arrangement lets the APU share the same fuel as the engines, keeping fuel management centralized, avoiding extra weight and complexity from a separate APU tank, and ensuring the APU has a reliable supply whenever needed. In practice, there isn’t a separate APU fuel tank or reliance on ground-support fuel for normal operation, and the APU does not carry its own internal fuel.

Fuel for the auxiliary power unit is drawn from the airplane’s main fuel system through a dedicated APU fuel line and pump. This arrangement lets the APU share the same fuel as the engines, keeping fuel management centralized, avoiding extra weight and complexity from a separate APU tank, and ensuring the APU has a reliable supply whenever needed. In practice, there isn’t a separate APU fuel tank or reliance on ground-support fuel for normal operation, and the APU does not carry its own internal fuel.