Where is the Emergency Escape Lighting system (ELS) switch located?

The Emergency Escape Lighting system (ELS) switch is located in both the cabin and flight deck because it is designed to provide illumination and guidance for safe exit during an emergency scenario. This dual placement ensures that both flight crew and passengers have access to emergency lighting to facilitate evacuation and guide them towards the nearest exits, regardless of their location on the aircraft.

Having the ELS switch in the flight deck allows pilots to activate the system in case of an emergency while also ensuring that cabin crew can manage lighting for passengers effectively. The presence of the ELS in the cabin is critical for passenger safety, especially where visibility might be compromised due to smoke or darkness. This comprehensive approach to safety reflects the importance of accessibility and visibility in emergency situations, making it vital for both areas of the aircraft to be equipped with the ELS.