Which statement about the Emergency Lights is true?

Which statement about the Emergency Lights is true?

• A. They can be activated only if the Emer Light Switch is ON.
• B. They are powered by the DC SHED ESS BUS.
• C. The F/A switch can activate them regardless of the Emer Light Switch position.
• D. They require external power to operate.

Answer: (C)

The key idea is that emergency lighting can be activated independently of the main emer light control. On an A320, the Flight Attendant switch provides a manual override that can switch on the emergency lighting even if the Emer Light Switch is not in the ON position. This ensures immediate illumination of the cabin and escape routes during an evacuation, regardless of the position of the regular emer lights control or the status of normal power. In addition, the emergency lights are backed by their own emergency power sources (so they can operate during a power failure for a limited time), which is why external power isn’t required in an emergency. Statements about activation being limited to the Emer Light Switch or about powering specifically from the DC shed essential bus distract from the override capability and the emergency power design, which is why the override by the F/A switch is the true point.

The key idea is that emergency lighting can be activated independently of the main emer light control. On an A320, the Flight Attendant switch provides a manual override that can switch on the emergency lighting even if the Emer Light Switch is not in the ON position. This ensures immediate illumination of the cabin and escape routes during an evacuation, regardless of the position of the regular emer lights control or the status of normal power.

In addition, the emergency lights are backed by their own emergency power sources (so they can operate during a power failure for a limited time), which is why external power isn’t required in an emergency. Statements about activation being limited to the Emer Light Switch or about powering specifically from the DC shed essential bus distract from the override capability and the emergency power design, which is why the override by the F/A switch is the true point.