What is the role of the emergency power source (EPS)?

The role of the emergency power source (EPS) is to provide power during a BATT bus failure. In the context of aircraft systems, the EPS is critical for maintaining essential electrical functions when the primary battery source is compromised or fails. This ensures that vital systems remain operational, thereby enhancing safety during flight.

While regulating battery temperatures, controlling cabin pressure, or activating emergency lighting are important functions in an aircraft, they do not specifically describe the primary purpose of the EPS. The EPS is specifically designed to ensure a continuous flow of power to critical systems that are necessary for the operation of the aircraft and ensuring the safety of passengers and crew during an emergency situation.