Lightplate and Instrument Lighting Control and Power Distribution Schematic  563 
33-11-0  Figure 2 (Sheet 1)  Nov 15/78 
Page 4 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

503  Lightplate and Instrument Lighting Control and Power 
Oct 20/83  Distribution Schematic  33-11-0 
Figure 2 (Sheet 2)  Page 4A 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

EFFECTIVITY
AIRPLANES WITH
INCANDESCENT LIGHTS

Pilot's Panel Background Lights Simplified Schematic  502 
33-11-0  Figure 3 (Sheet 1)  Oct 20/83 
Page 4B 

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
AIRPLANES WITHOUT
INCANDESCENT LIGHTS

503  Pilot's Panel Background Lights Simplified Schematic 
Oct 20/83  Figure 3 (Sheet 2)  33-11-0 
Page 5 

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

B.  The 115-volt ac transfer bus No. 1 supplies power to operate the fluorescent lamps. The 28-volt ac transfer bus No. 2 supplies power to operate the incandescent background lights where installed. The 28-volt dc battery bus provides power for emergency incandescent light operation.
C.  The captain's knob labeled BACKGROUND on the main instrument panel provides control. Rotating the BACKGROUND control clockwise varies the intensity of the lamps from off to bright.
D.  On airplanes with incandescent lighting, the full BRIGHT position of the BACKGROUND control removes power from the incandescent lamps and turns on the single intensity fluorescent lamps.
4.  Dome Lights
A.  Dome lights located on the aft portion of the control cabin provide general area illumination. Lighting intensity variation is provided by dome light controls on the aft overhead panel. See Fig. 1 for dome light location and controls.
B.  The dome lights are intensity controlled by a three-position (DIM-OFF-ON) toggle switch on the aft overhead panel. A resistor provides voltage drop for lamp dimming. The 28-volt dc battery bus supplies power for dome light operation (Fig. 4).
5.  Control Stand Floodlight
A.  An incandescent light located above a cutout in the forward overhead panel provides general area control stand illumination. Intensity control is provided by a FLOODLIGHT variable transformer control on the aft control stand panel (Fig. 1). The 28-volt ac transfer bus No. 1 supplies power for the control stand floodlight operation (Fig. 4).
6.  Flight Kit Lights
A.  Flight kit lights are located on the control cabin sidewalls next to the captain's and first officer's seats (Fig. 1) . Rotation of the front housing provides either red or white lighting as desired; rotation of the rear housing controls light intensity. A wire catch holds the lens in position; for relamping, remove the catch and replace the lamp. The 28-volt ac transfer bus No. 1 supplies power for light operation (Fig. 5).
508 
33-11-0 Page 6  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/83 

535  Dome Lights and Control Stand FloodLight Simplified Schematic 
Feb 15/72  Figure 4  33-11-0 
Page 7 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

7.  Map Lights
A.  The captain's and first officer's white map lights are in the upper center window cavities. The lights are controlled by a switch and an intensity control on the captain's and first officer's side panels. Rotation of the bottom housing controls the light spot diameter. The 28-volt ac transfer bus No. 1 provides power for light operation. (See figure 5.)
8.  Circuit Breaker Panel Lights
A.  The circuit breakers on P6 load control center-right and P18 load control center-left are illuminated by floodlights. Three floodlights illuminate the P6 panel and two floodlights illuminate the P18 panel. A variable-transformer on the forward overhead panel provides control. (See figure 1.)
B.  The 28-volt ac transfer bus No. 2 supplies power to the variable transformer. The variable transformer supplies 0 to 28 volts ac to the floodlight lamps. (See figure 5.)
9.  Compass Light
A.  The standby compass face is illuminated by a small white light inside the compass. (See  figure 1.)
B.  The light is controlled by an adjacent three-position COMPASS light switch. In the DIM position, a resistor reduces the voltage and causes the light to illuminate dimly and in the BRIGHT position the light illuminates brightly. When in the OFF position, the light is off. (See figure 5.)
　
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