B.  On Standard Passenger Airplanes, the window lights are controlled by the window light switch on the attendants’ panel. The switch is a two position (ON-OFF) type. On Passenger/Cargo Convertible Airplanes, the window lights are controlled by two switches, one on the cargo door panel and the other on the aft galley attendant’s panel (Fig. 3).
C.  The 115-volt ac ground service bus provides primary airplane power for window light illumination. When external power is connected to the airplane, the power for window light illumination is automatically transferred by the power switching relay, to the external power source.
D.  Setting the window light switch to ON supplies a ground to the window lights relay connecting 115 volts ac to the window lights autotransformer. The transformer provides 200 volts ac to the window light ballasts causing all window lights to come on.
5.  Entry Lights
A.  On Standard Passenger Airplanes, the forward entry is illuminated by a ceiling mounted light assembly comprised of a ballast, two fluorescent lamps and one incandescent lamp. On Passenger Cargo Convertible Airplanes, the forward entry light assembly is comprised of two ballasts, four fluorescent lamps and one incandescent lamp. In addition, a threshold light is mounted on the forward windscreen (Fig. 1). The lights are controlled by a three position rotary ENTRY switch on the forward attendant’s panel. In the OFF position, all lights are off unless ground power is applied. With ground power applied, control to the dim entry light (incandescent) is bypassed and the light is on. In the DIM position, the dim entry light is on and in the BRIGHT position, the fluorescent lamps and the threshold light are on (Fig. 4).
B.  The aft entry is illuminated by a ceiling mounted light assembly comprised of a ballast, two fluorescent lamps and one incandescent lamp. In addition, a threshold light is mounted on the aft lavatory wall. Power and control are identical to the forward entry lights except the switch is on the aft attendant’s panel.
6.  Passenger Reading Lights
A.  Passenger reading lights are mounted in the PSU’s located above each seat group. A pushbutton switch located adjacent to each reading light enables the passengers to turn their reading lights on and off. Each reading light consists of an incandescent lamp and housing that is attached to a movable lens assembly by two spring clips. The reading lights can be adjusted fore and aft by the passenger; however, lateral adjustment requires lowering of the PSU and loosening the adjusting pins. Lateral adjustment is preset to provide a light beam direction that corresponds to the seat it serves (Fig. 1).
B.  The 28-volt ac buses No. 1 and 2 provide power for reading light operation through circuit breakers on the P18 panel. 
33-21-01 May 15/79 Page 8
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

K79610 K79611
533  Entry Lights Schematic 
May 15/72  Figure 4 (Sheet 1)  33-21-01 
Page 8A/8B 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

533  Entry Lights Schematic 
May 15/72  Figure 4 (Sheet 2)  33-21-01 
Page 9 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Passenger Information Signs
A.  Passenger information signs include the no smoking, fasten seat belt, and return to seat. The 28-volt ac buses provide power for sign operation. The no smoking and fasten seat belt signs are housed in a common module and mounted on forward end of each PSU (Fig. 1) Two incandescent lamps illuminate the no smoking legend and three incandescent lamps illuminate fasten seat belt legend. The sign legends are not readily apparent unless illuminated. The return to seat signs are located in each lavatory and illuminate with the fasten seat belt signs.
B.  The signs are controlled by three-position switches on the overhead panel and by a flap switch in the right main wheel well and the landing gear lever switch in the center instrument panel. With the toggle switches in AUTO position, if the flaps are lowered, the seat belt signs illuminate and if the landing gear is lowered, both the no smoking and seat belt signs illuminate (Fig. 6).
C.  For lavatory occupied lights, refer to par. 8 and for passenger call signs, refer to 33-25-0.
8.  Lavatory Lights and Signs
A.  One dome light in each lavatory is on at all times, providing low level lighting. When the door is locked the fluorescent mirror lights come on (Fig. 7).
B.  The occupied sign adjacent to the lavatory on the lowered ceiling is illuminated when the door is locked. Power is supplied the same as for the dome light (Fig. 1 and 7).
　
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