Which statement about Emergency Light Switch?

• A. It does not activate the Emergency Signaling System.
• B. It activates both Emergency Lighting and Emergency Signaling System.
• C. It only activates the exterior lights.
• D. It is used to test emergency lighting daily.

Answer: (A)

The emergency light switch is about powering the aircraft’s escape-route lighting when normal power is lost. Its job is to illuminate path lighting and exit signs so passengers and crew can evacuate safely. It does not energize the Emergency Signaling System, which is a separate system used to send alerts. That’s why the statement that it activates both emergency lighting and signaling is not correct. The switch isn’t used to test emergency lighting on a daily basis, either; testing is done with a dedicated test procedure or switch elsewhere, depending on the aircraft version. The option claiming it only reacts exterior lights doesn’t fit because the emergency lighting system covers interior path lighting and exit signs, not just exterior lights.