What activates the electric boost pump when the fuel pressure drops below 10 psi?

The electric boost pump is activated by a pressure switch when the fuel pressure drops below 10 psi. This switch is designed to monitor the fuel system's pressure and ensure that it remains within safe operating limits. When the pressure falls below the threshold, the pressure switch sends a signal to activate the electric boost pump, which helps to maintain proper fuel flow and prevent engine starvation.

The other options relate to different components or systems within the aircraft but do not specifically serve the function of monitoring fuel pressure and activating the pump in response to a low-pressure condition. For example, a pressure gauge would simply display the current fuel pressure but would not activate the pump. A flow sensor tracks fuel flow rates and does not directly control the electric boost pump. The fuel management system is responsible for overseeing fuel distribution but relies on components like the pressure switch to function effectively regarding pressure monitoring.