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The ZMU has the logic from the configuration data base. It uses the logic to tell the OEU what light to set on and the level of that light.
See the cabin services system section for more information (SECTION 23-39).
See the passenger service system section for more information about the OEU (SECTION 23-33).
Power for the fluorescent direct ceiling lights is from the ground service bus. These lights come on bright when the ground service bus gets power. They will stay on bright until the ZMU gets power from the transfer bus and another selection is made. If you open the flight comppartment door when the engines are on, the direct celing light immediately aft of the flight compartment door goes off.
Power for the incandescent direct ceiling lights is from the main ac buses.
The ELMS (not shown) uses the ARINC 629 buses to make the fluorescent direct ceiling lights come on bright when the passenger oxygen masks are deployed. They stay on bright until the oxygen system is reset.
These lights operate the same when passenger oxygen is deployed:
*
Indirect ceiling

*
Sidewall

*
Entry.

See the passenger compartment illumination section for more information (SECTION 33-21).
See the passenger oxygen system section for more information (SECTION 35-21).
The transfer buses must have power for the standby lights to operate. The standby lights come on automatically if the ground service bus loses power and the transfer bus has power.
The night lights also come on automatically if the ground service bus loses power and the transfer bus has power.
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PASSENGER LOADING LIGHTS -DIRECT CEILING AND STANDBY LIGHTS -FUNCTIONAL DESCRIPTION

See the passenger compartment illumination section for more information about the night lights (SECTION 33-21).
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PASSENGER LOADING LIGHTS -DIRECT CEILING AND STANDBY LIGHTS -FUNCTIONAL DESCRIPTION

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PASSENGER LOADING LIGHTS -ENTRY LIGHTS

Purpose
The entry lights give light in the airplane entry areas.
Location
The lights are in the overdoor panel at doors 1 and 2 left.
Controls for passenger loading entry lights are on the entry way lights screen. This screen is on the cabin system control panel (CSCP) and the cabin area control panel (CACP).
Physical Description
The entry lights have these components:
*
Fluorescent lamp

*
Lens

*
Bezel

*
Ballast.

Training Information Point
Six holes in the bezel let you use a pin type tool to release the bezel for access to the fluorescent lamp. Four lanyards hold the bezel when it releases from the assembly.
The ballast is an LRU. You lower the overdoor panel for access to it.
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777 AIRCRAFT MAINTENANCE MANUAL

PASSENGER LOADING LIGHTS -ENTRY LIGHTS

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PASSENGER LOADING LIGHTS -ENTRY LIGHTS -OPERATION

Operation
Controls for passenger loading entry lights are on the entry way lights screen. This screen is on the cabin system control panel (CSCP) and the cabin area control panel (CACP).
The area select indicator lets you select the area of the cabin that the entry way light selection will control. The configuration data base that is loaded in the cabin services system (CSS) supplies this information:
*
The area description name

*
The number of area segments.

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PASSENGER LOADING LIGHTS -ENTRY LIGHTS -OPERATION

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PASSENGER LOADING LIGHTS -ENTRY LIGHTS -FUNCTIONAL DESCRIPTION

Functional Description
The configuration data base that is loaded in the cabin services system (CSS) sets the lights that come on in each selection.
Light selections made on the cabin area control panel (CACP) or cabin system control panel (CSCP) go directly to the zone management unit (ZMU).
The ZMU has the logic from the configuration data base. It uses the logic to tell the OEU what light to set on and the level of that light.
See the cabin services system section for more information (SECTION 23-39).
　
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