L-1011 Electrical: Emergency Light Switch (24-39)

The Emergency Lighting System Switch is a guarded three-position toggle switch which controls emergency lighting for Flight Station Escape Hatch, Cabin Exits, Cabin Aisle Lights and Emergency Evacuation Slide Areas.

When switch is in the OFF position, the automatic function of all the emergency lights is disarmed and the UNARM light will be illuminated.

All Emergency Lights are illuminated when the switch is in the ON position. An UNARM light illuminated anytime the switch is not in the ARM position.

When the switch is in the armed position, the Emergency lights are armed to illuminate automatically if DC Essential Bus failure is detected, the pilot must manually reset the switch by switching it off and back to the ARM position.