737 Flight Crew Operations Manual
Airplane General, Emergency
Equipment, Doors, Windows -
Systems Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 1.40.5
Passenger Cabin Lighting
Passenger cabin lighting is supplied by incandescent and fluorescent lights.
General cabin lighting is provided by window lights, ceiling lights, and entry
lights. Reading lights are located above each passenger seat in the passenger
service unit. Lights are also installed in the lavatories and galleys.
Passenger Cabin Signs
The passenger cabin signs are controlled by a switch on the forward overhead
panel. With Auto selected, the signs are controlled automatically by reference to
landing gear and flap positions:
FASTEN BELTS and RETURN TO SEAT signs:
• illuminate when flaps or gear are extended
• extinguish when flaps and gear are retracted.
YK981 - YK992
NO SMOKING signs:
• are illuminated at all times.
YK993 - YW274
All passenger signs can be controlled manually by positioning the respective
switch to ON or OFF.
YK981 - YK992
The FASTEN BELTS and RETURN TO SEAT signs can be controlled manually
by positioning the respective switch to ON or OFF.
When the passenger cabin signs illuminate or extinguish, a low tone sounds over
the PA system.
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
Attendant 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.
September 15, 2016
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