Which power source is responsible for discharging the #2 Engine Fire Bottles?

The correct answer is the HOT BAT BUS, which is specifically designed to provide power to critical systems such as the fire bottle discharge circuits. The fire bottles in an aircraft like the Dassault Falcon 7X are essential for fire suppression, particularly in the engines, and are activated using a reliable power source to ensure they can operate effectively in an emergency.

The HOT BAT BUS remains powered even when the aircraft is in a shutdown state, allowing for the discharge of fire extinguishing agents from the fire bottles to occur independently of the main electrical systems. This feature is crucial in ensuring that the crew can act quickly in the event of an engine fire, enhancing safety measures for the aircraft.

In contrast, the left and right battery buses and the main bus do not have the same redundancy and continuous availability designed for emergency situations. Therefore, they do not serve as the primary power source for the fire bottle discharge systems, making the HOT BAT BUS the appropriate choice for this particular function.