How many tanks have electrical boost pumps?

How many tanks have electrical boost pumps?

• A. 2
• B. 3
• C. 4
• D. 6

Answer: (B)

Electrical boost pumps are used to ensure a steady, pressurized flow of fuel from the tanks to the engine, even when gravity or suction might not be enough. They also make it possible to transfer fuel between tanks and to prime the system for engine start. In this system, three tanks are equipped with electrical boost pumps—one in each wing tank and one in the centerline/auxiliary tank. This arrangement provides redundancy so that if one pump or tank has an issue, the engine still has a reliable fuel supply from the other pumps. It also supports efficient cross-feed and fuel management during different flight phases and maneuvering, which helps prevent engine fuel-starvation. Tanks that lack boost pumps would rely more on gravity feed or the primary engine-driven pump, which is less reliable under certain attitudes or high-demand conditions.

Electrical boost pumps are used to ensure a steady, pressurized flow of fuel from the tanks to the engine, even when gravity or suction might not be enough. They also make it possible to transfer fuel between tanks and to prime the system for engine start.

In this system, three tanks are equipped with electrical boost pumps—one in each wing tank and one in the centerline/auxiliary tank. This arrangement provides redundancy so that if one pump or tank has an issue, the engine still has a reliable fuel supply from the other pumps. It also supports efficient cross-feed and fuel management during different flight phases and maneuvering, which helps prevent engine fuel-starvation.

Tanks that lack boost pumps would rely more on gravity feed or the primary engine-driven pump, which is less reliable under certain attitudes or high-demand conditions.