33-20-00
ALL ú ú 04 Page 2 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
Passenger Compartment Lighting - Component Location
Figure 1 (Sheet 2)
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33-20-00
ALL ú ú 01 Page 3 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E38920
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A
737-300/400/500MAINTENANCE MANUAL
PASSENGER COMPARTMENT LIGHTS - DESCRIPTION AND OPERATION
________________________________________________________
General
_______
A. Passenger compartment lighting comes from these sources:
(1)
Ceiling Lights
(2)
Night Lights
(3)
Window Reveal (Sidewall) Lights.
B. Relays and transformers for the passenger compartment lighting are on the J5 and the J10 shields in the electronic equipment compartment.
C. For more data about this lighting system, refer to these sources:
(1) SSM 33-21-00 thru 33-22-99
(2) WDM 33-21-11 thru 33-22-99Ceiling Lights
______________
A. The ceiling lights give general lighting to the passenger compartment from above.
B. These lights are installed on the outboard edges of the sculptured ceiling panels.
C. The 115 volts ac of electrical power for these lights comes from the load control center panel, P18.
D. Ballasts supply the electrical power to the lamps in the ceiling lights.
(1) Some ceiling lights do not have a ballast. Each of these lights operate from the ballast in an adjacent ceiling light.
E. You control the ceiling lights with a switch on the attendant's panel.
(1)
When you set the switch to the dim position, a transformer increases the 115 volts ac to 280 volts ac. This electrical power is supplied to each ballast to make the ceiling lights come on dimly. When you set the switch to the bright position, 115 volts ac more electrical power is supplied to each ballast. This makes the ceiling lights come on brightly.
(2)
The ground service switch on the forward attendant's panel controls a relay to change the source of the 115 volts ac of electrical power. The electrical power can come from the ac transfer bus or from the ground service bus.
(3)
AIRPLANES WITH THE CEILING LIGHTS CONNECTED TO THE OXYGEN DEPLOYMENT RELAY; If the air pressure in the passenger compartment decreases to less than the air pressure at 14,000 feet, the ceiling lights will come on brightly automatically.
Night Lights
____________
A. The night lights give dim lighting to the passenger compartment from above.
B. There is a night light installed on an end of some ceiling lights.
C. The 28 volts ac of electrical power for the night lights comes from the P18 panel.
D. You control the night lights with a switch on the attendant's panel.
(1) When you set the switch for the ceiling lights to the NIGHT
position, the night lights come on.
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33-21-03
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