Emergency Lighting
Exit lights are located throughout the passenger cabin to indicate the approved emergency
exit routes. The system is controlled by a switch on the overhead panel.
The switch has three positions, OFF, ARMED and ON and is guarded to the ARMED
position. With the switch in the ARMED position, the emergency exit lights are normally
extinguished. If electrical power to DC bus No. 1 fails or if AC power has been turned off,
the emergency exit lights illuminate automatically.
The emergency exit lights may also be illuminated by a switch on the aft attendants panel.
Lifting the guard and pushing the switch ON overrides the flight deck control and illuminates
the emergency exit lights. Control from this panel is available in the event of failure of the
automatic control.
The flight deck aft DOME light contains a separate bulb that is powered by the emergency
lighting system to provide for flight deck evacuation.
