How is the emergency lighting system manually activated?

• A. Through the Emergency Light Switch (ELS) located in the flight deck or cabin
• B. By pulling a passenger seat belt sign
• C. By turning on the cockpit red beacon
• D. By pressing a master call panel button

Answer: (A)

The ability to illuminate the cabin quickly in an emergency rests on a dedicated control that directly powers the emergency lighting circuits. This is the Emergency Light Switch, a switch placed in the flight deck or cabin so the crew can arm or activate the emergency lighting as needed. When this switch is used, all emergency lighting—exit signs, floor path lighting, and cabin illumination in key areas—comes on, providing clear guidance for passengers to find exits and for crew to manage evacuation. This manual activation bypasses any automatic lighting logic and ensures immediate illumination even if normal lighting or automatic systems aren’t functioning.

The other actions don’t control the emergency lighting. Pulling a passenger seat belt sign only affects passenger seating indicators, not lighting. The cockpit red beacon is a signaling device, not part of the lighting circuits. Pressing a master call panel button is for notifying crew and coordinating with the cabin, not for turning on emergency lighting.