*
Prerecorded announcement machine (PRAM)
*
Ambient noise sensors (ANSs)
*
Speaker drive modules (SDMs)
*
Zone management units (ZMUs)
*
Cabin attendant handsets (CAHs)
*
Cabin speakers.
These other components and systems connect to the PAS:
*
Audio management unit (AMU)
*
Left systems ARINC 629 bus
*
In-flight entertainment (IFE) system
*
Cabin system management unit (CSMU)
*
Right systems ARINC 629 bus
*
Attendant switch panel (ASP)
*
Audio entertainment player (AEP)
*
Cabin control panels (CCPs).
EFFECTIVITY
BEJ ALL
Audio Inputs
All passenger address audio goes to the PA/CI controller.
The flight crew uses the flight interphone system to make announcements. The announcement audio goes from the AMU to the PA/CI controller.
The PRAM supplies recorded announcements. The PRAM also sends boarding music to the PA/CI controller.
The flight attendants use CAHs to make announcements.
Priorities
The PAS has these priorities:
*
1 -From flight interphone system
*
2A -Direct access
*
2B -From cabin interphone system
*
3A -Recorded announcements
*
3B -Video system audio
*
4 -Boarding music.
Audio Outputs
The PA/CI controller selects the audio with the highest priority and digitizes it. It sends the signal to the SDMs. The SDMs change the signal to analog and send it to up to four speakers.
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PAS -GENERAL DESCRIPTION
The PA/CI controller also sends the announcement audio to the IFE system. This system then sends the audio over the passenger entertainment system so the passengers hear the announcement on their headphones.
The PAS also makes a chime sound for attendant calls and passenger information signs. The PA/CI controller sends chime control signals to the SDMs.
Volume Control
The configuration database gives the normal volume level. The PAS makes automatic adjustments based on either cabin noise level inputs from the ANSs or flight data inputs. In addition, flight attendants use the CCPs to adjust the volume manually.
Pause Signals
When an announcement goes to all areas, the CSMU sends a pause signal to the IFE system.
Other Interfaces
The PA/CI controller has an interface with the left systems ARINC 629 bus. It uses airplane system data to adjust volume and to control chime sounds.
You use the cabin control panels (CCPs) to control the PAS. A CCP operates as a cabin area control panel (CACP) or as a cabin system control panel (CSCP), depending upon it configuration.
The PA/CI controller has an alternate passenger address controller. If there is a failure on the normal passenger address controller, the flight attendants get a message on the cabin control panels (CCPs). The flight attendant pushes a button on the attendant switch panel (ASP) to select the alternate passenger address controller.
The CSMU sends the passenger address controller selection to the PA/CI controller. You use the CSCP to do tests and install software.
The CSMU connects to the IFE system with an ARINC 628 head-end interface. It sends airplane system data and cabin services system (CSS) configuration data to the IFE system.
EFFECTIVITY BEJ ALL 23-31-00
Page 6
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
PAS -GENERAL DESCRIPTION
EFFECTIVITY BEJ ALL 23-31-00
Page 7
D633W101-BEJ Jan 05/2002
PAS -COMPONENT LOCATIONS
PAS Components
These are the types of passenger address system (PAS) components in the cabin and crown:
*
Speaker drive modules (SDMs)
*
Speakers
*
Ambient noise sensors (ANSs)
*
PA NORM/ALT switch.
There are three columns of SDMs.
These PAS components are in the main equipment center:
*
Passenger address/cabin interphone (PA/CI) controller
*
Prerecorded announcement machine (PRAM).
Other Components
These are the other CSS components in the cabin:
*
Cabin system control panel (CSCP)
*
Cabin area control panels (CACPs).
You find the exact locations of the components with the wiring diagram and functional schematic.
EFFECTIVITY BEJ ALL 23-31-00
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