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pax -passenger
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PIS -passenger information sign
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PSEU -proximity sensor electronics unit
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PSS -passenger service system
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777 AIRCRAFT MAINTENANCE MANUAL
PASSENGER SERVICE SYSTEM -INTRODUCTION
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PSS -GENERAL DESCRIPTION
General
The passenger services system (PSS) has head-end and zone interfaces with the in-flight entertainment (IFE) system for PSS functions.
The PSS gets inputs from the left and right systems ARINC 629 buses and flight attendants to control passenger information signs.
The PSS also gets data from passengers to control reading lights and attendant call lights.
The PSS sends configuration database information and status information to the IFE.
Components
These are the main components of the passenger service system (PSS):
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Zone management units (ZMUs)
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Cabin control panels (CCPs)
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Overhead electronics units (OEUs)
These other systems and components connect with the PSS:
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Cabin system management unit (CSMU)
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Passenger address/cabin interphone (PA/CI) controller
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Right and left systems ARINC 629 buses
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Lavatory modules
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Reading and call lights.
Passenger Service/Entertainment On/Off
Attendants may use the CCPs to enable or disable the reading lights and attendant call lights. They may also use a panel to turn off the attendant call and reading lights.
Passenger Information Signs
The PSS gets inputs from other systems to control passenger information signs. The OEUs send signals to control these types of signs:
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Lavatory
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Return to seat
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Fasten seat belts
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No smoking.
Reading Light Control
Passengers use controls at their seat to control reading lights. The reading light selection goes through the IFE seat components to the ZMU. The ZMU sends the on or off signal to an OEU to control the reading light.
Passenger to Attendant Call
Passengers use controls at their seat to call a flight attendant. When the passenger pushes the attendant call button:
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PSS -GENERAL DESCRIPTION
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A row call light in the passenger service unit (PSU) comes on
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A master call light at an attendant station comes on
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The passenger address system makes a chime.
Chime Cut-Off Function
Attendants use the CCPs to disable the chime related to a passenger-to-attendant call. Each CCP controls the chimes in an area identified by the configuration database.
Lavatory Functions
The lavatories connect with OEUs for lavatory to attendant calls and lavatory status signals.
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PSS -GENERAL DESCRIPTION
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PSS -COMPONENT LOCATION
General
Passenger service system (PSS) components are in the main equipment center and the cabin area.
Cabin Components
These components are in the cabin:
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Zone management units (ZMUs)
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Overhead electronics units (OEUs)
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Cabin system control panel (CSCP)
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Cabin area control panels (CACPs).
Main Equipment Center
The cabin system management unit (CSMU) and the passenger address/cabin interphone (PA/CI) controller are on the E1-4 shelf in the main equipment center.
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PSS -COMPONENT LOCATION
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PSS -POWER INTERFACE -ZONE 1
General
Circuit breakers on the right and left power management panels control power to these zone 1 components:
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Zone management unit (ZMU) 1
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Overhead electronics units (OEUs).
