What is meant by the term 'residual fuel'?

What is meant by the term 'residual fuel'?

• A. The fuel remaining in the tanks, lines, and engine after draining
• B. The fuel remaining in the tanks after draining
• C. The fuel that cannot be burned
• D. The fuel used in flight

Answer: (B)

Residual fuel is the amount of fuel that remains in the tanks after the fuel system has been drained as far as possible. In weight-and-balance calculations, this defined quantity provides a conservative, repeatable value to use for determining aircraft weight and balance. It specifically refers to fuel left in the tanks; fuel that remains in lines or engine feeds isn’t counted in this standard residual amount. The other ideas—fuel in lines/engine, fuel that cannot be burned, or fuel used in flight—do not fit the established definition and use of residual fuel.

Residual fuel is the amount of fuel that remains in the tanks after the fuel system has been drained as far as possible. In weight-and-balance calculations, this defined quantity provides a conservative, repeatable value to use for determining aircraft weight and balance. It specifically refers to fuel left in the tanks; fuel that remains in lines or engine feeds isn’t counted in this standard residual amount. The other ideas—fuel in lines/engine, fuel that cannot be burned, or fuel used in flight—do not fit the established definition and use of residual fuel.