What does ELS stand for?

What does ELS stand for?

• A. Emergency Locator Transmitter
• B. Exterior Lighting System
• C. Emergency Life Support
• D. Emergency Lighting System

Answer: (D)

The term ELS refers to the Emergency Lighting System. This is the system on the aircraft that provides illumination for exits and escape routes when normal power is lost, helping passengers and crew find their way out during an evacuation or electrical failure. It includes exit signs, floor-level proximity lights, and other lighting that automatically activates with a loss of power or when a test switch is used, using battery backup to stay lit.

This is distinct from an Emergency Locator Transmitter, which is a distress beacon used to locate the aircraft after an accident. It’s also not an Exterior Lighting System, which would concern lights on the outside of the airplane, and not a generic Emergency Life Support term. So the Emergency Lighting System best fits the acronym ELS.