How is the Emergency Lighting System (ELS) activated?

The Emergency Lighting System (ELS) is designed to provide necessary illumination to ensure safe evacuation during emergencies, particularly if the main power supply fails. The system can be activated manually by pressing the EMER button located on the Flight Attendant Panel (FAP). This is the most reliable way to ensure the lights are turned on in urgent situations where immediate action is required.

While automatic activation can occur under certain circumstances, such as loss of power or system malfunctions, relying on manual control allows for a quicker and intentional response by crew members when they assess the need for emergency lighting. This approach gives crew members the ability to manage the lighting system actively rather than having it depend solely on automatic triggers, which may not always function as intended in all scenarios.