The control function permits both display and selection. These are some of the systems controlled by the CSS:
*
Cabin temperature selection
*
Air/ground communication.
CSS Maintenance
Maintenance personnel use the cabin system control panel (CSCP) to test and to install software in the CSS. The CSCP has a touch sensitive screen for selections.
The CSCP sends test selections to the CSMU. The CSMU sends the test selection to the CSS components. The CSCP keeps test results in memory and shows them on the screen.
The CSCP also sends failure data through the in-flight entertainment system to the cabin printer for a paper copy.
The CSCP has a disk drive. You use the CSCP to install software for the configuration database and LRU operational programs.
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CABIN SERVICES SYSTEM -GENERAL DESCRIPTION
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CSS GENERAL -COMPONENT LOCATIONS
General
* Cabin system management unit (CSMU)
CSS components are in the main equipment center and the * Passenger address/cabin interphone (PA/CI) controller. cabin area.
A typical passenger cabin has these three zones:
*
Zone 1 starts at the forward part of the cabin and ends at
door 2
*
Zone 2 is between doors 2 and 3
*
Zone 3 is from door 3 to the aft end of the cabin.
Cabin Components
These components are above the cabin ceiling panels:
*
Zone management units (ZMUs)
*
Speaker drive modules (SDMs)
*
Ambient noise sensors (ANSs).
These components are in the passenger cabin:
*
Overhead electronics units (OEUs) (in the passenger service
units)
*
A cabin system control panel (CSCP)
*
Cabin area control panels (CACPs)
*
Cabin printer
*
Cabin attendant handsets (CAHs) (near each door).
Main Equipment Center Components
These components are in the main equipment center:
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777 AIRCRAFT MAINTENANCE MANUAL
CSS GENERAL -COMPONENT LOCATIONS
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CSS GENERAL -COMPONENT LOCATIONS 2
General
CSS components are in the main equipment center and the cabin area. The cabin diagram shows a typical configuration.
The passenger cabin has three zones:
*
Zone 1 starts at the forward part of the cabin and ends at door 2
*
Zone 2 is between doors 2 and 3
*
Zone 3 is from door 3 to the aft end of the cabin.
Each zone has three columns of overhead electronics units (OEUs) and one column of speaker driver modules (SDMs).
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777 AIRCRAFT MAINTENANCE MANUAL
CSS GENERAL -COMPONENT LOCATIONS 2
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CSS GENERAL -CONFIGURATION DATABASE GENERATOR
General
The CSS uses a database to identify the interior configuration and optional features of the system. The database software has programmable selections that permit changes to the interior configuration and optional features.
Many CSS components keep configuration data in nonvolatile memory. If you replace a component, you must install the configuration database.
The database controls many functions, including:
*
Passenger seating area
*
Cabin light levels
*
Passenger address areas
*
Cabin interphone handset locations and dial codes
*
CSCP and CACP screen selections.
Configuration Database Generator
The configuration database generator (CDG) is a software tool that operates on a personal computer. Boeing uses the CDG to write the original configuration database.
Boeing copies the database onto 3 1/2 inch floppy diskettes and carries them to the airplane to install into the CSS.
The airline engineering organization also has a copy of the Boeing CDG. If the airline chooses to change the interior configuration or change an optional feature, they change the configuration database using the CDG. They copy the new database to a floppy disk and carry it to the airplane to install it into the CSS.
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