What happens when a/c power is lost regarding the ELS?

When alternating current (A/C) power is lost, the Emergency Lighting System (ELS) is designed to automatically illuminate. This automatic activation ensures that essential areas within the aircraft are adequately lit, allowing the flight crew and passengers to navigate safely in the event of an emergency or power failure. The purpose of the ELS is to enhance safety by providing illumination that guides everyone on board towards exits and provides visibility during critical situations.

Automatically activating the ELS reduces the response time needed for the flight crew to locate and activate backup systems manually. This feature is particularly important in emergencies where darkness or low visibility conditions could pose a significant risk to passenger and crew safety. Therefore, the automatic illuminating function is a crucial aspect of the ELS that enhances overall safety protocols.