When do the electric boost pumps turn on?

The electric boost pumps are designed to provide reliable fuel flow and pressure to the engine, particularly under circumstances where the fuel supply might be compromised or insufficient. They typically activate during specific conditions that are crucial to the safe operation of the aircraft.

The correct answer reflects that the electric boost pumps operate either when the pilot manually activates them or when automatic conditions trigger their operation. For instance, they may function during engine start-up, during low fuel pressure situations, or when the aircraft is at low altitude where gravity-fed fuel flow may not be adequate. This versatility helps ensure that the engines receive a steady fuel supply, critical for safe flight operations.

Other choices do not encompass the full operational characteristics of the electric boost pumps. For instance, stating that the boost pumps operate only during takeoff would ignore their importance during various phases of flight, such as engine start or in the event of a fuel pressure drop. Similarly, indicating that they run only when the engine is running does not account for their role during engine start or potential issues that arise while in flight. Understanding the conditions under which the boost pumps activate is vital for pilots to manage fuel system integrity effectively.