What closes the Engine shutoff valve?

The engine shutoff valve is a critical component in aircraft systems, primarily responsible for stopping fuel flow to the engine in specific situations, such as during an engine fire or when an emergency shutdown is necessary. The correct closing mechanism for this valve is the activation of the Engine Fire Switchlight and the Fuel Valve Switchlight.

When pilots or crew members detect a fire condition, they can use these specific switchlights to initiate a response that involves closing the engine shutoff valve. This action is crucial because it prevents additional fuel from flowing to the fire, thereby minimizing the risk of the situation escalating and enhancing the safety of the aircraft.

In contrast, other options do not directly close the engine shutoff valve, which is why they are not the correct choice. The throttle lever, for instance, primarily controls engine power but does not interact with the shutoff valve in a way that would close it. The technician during maintenance would typically perform checks and service the valve, but this is not an operational procedure during flight. Lastly, fuel feed chamber pressure plays a role in the fuel delivery system's operation but does not serve as a mechanism for closing the shutoff valve directly. Therefore, the correct answer highlights the specific operational procedure that relates to fire safety protocols in aviation.