K79549
Passenger Cabin Lighting Components Locations 533
33-21-01 Figure 1 (Sheet 1) Feb 15/72
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
AIRPLANES WITH WIDE-BODY LOOK INTERIOR
K79599
506 Passenger Cabin Lighting Components Location
May 15/79 Figure 1 (Sheet 2) 33-21-01
Page 3
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
AIRPLANES WITH SINGLE
LOUVERED CEILINGS AND
CARRY-ALL COMPARTMENT
INTERIORS
Passenger Cabin Lighting Components Location 515
33-21-01 Figure 1 (Sheet 3) Aug 15/78
Page 4
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
T53398
506 Ceiling Lights Simplified Schematic
Feb 15/79 Figure 2 33-21-01
Page 5
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. The 115-volt ac ground bus provides primary power for fluorescent ceiling light operation and control. Primary and secondary circuit breakers on the P18 load control center panel provide protection. Setting the CEILING lights switch on the attendant's panel to DIM energizes the ceiling light relay R120, which connects 115 volts ac to the ceiling light autotransformers. The autotransformers provide 260 volts ac to terminal A2 of the ballasts. This causes the fluorescent ceiling lights to come on in the dim mode. Setting the ceiling lights switch to BRIGHT energizes R120 as before and provides 75 volts ac, through secondary circuit breakers on P18 panel, to terminal A3 of each ballast and 260 volts ac to terminal A2. This causes the fluorescent ceiling lights to come on in the bright mode. The 75-volt power is obtained from the low voltage terminal of the same autotransformer as the 260-volt power.
3. Night Lights (Fig. 2)
A. Incandescent night light lamps are installed in each ceiling panel adjacent to the inboard fluorescent lamp. The night light lamps perform two functions: one is to provide a low level night illumination and the other is as automatically activated standby lights to provide general area illumination in event of a partial power failure (power to fluorescent ceiling light circuit is lost). Approximately one-half of the lights come on when the night light circuit is energized, however, all of the lights come on in event of partial power failure.
B. The 28-volt ac ground service bus provides power to the night lights for normal operation, and the 28-volt ac bus No. 2 provides power to the standby lights when required. Setting the CEILING light switch on the attendants' panel to NIGHT connects 28-volt ac ground service bus power to the night lights through the normally open contacts of night light relay. In event of partial power failure, the night light relay de-energizes and connects the 28-volt ac bus No. 2 power to the standby lights.
C. When the ceiling light switch is set to DIM or BRIGHT, the night lights are off and power is available to the normally closed contacts of the standby light relay to provide illumination in case of partial power failure.
4. Window Lights (Fig. 3)
A. A fluorescent light assembly is installed in the sidewall panels above each window. The window lights provide soft white sidewall illumination. The window light assemblies are removed for replacement or relamping by releasing two quick-release fasteners and disconnecting an electrical connector. The ballasts for the window lights are mounted on support structure behind the adjacent PSU. Access to ballasts is by releasing two quick-release fasteners and lowering the PSU. One ballast is used to control two fluorescent window lights in most installations.
503
33-21-01 Page 6 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 1/74
K79608
506 Window Lights Schematic
May 15/79 Figure 3 33-21-01
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