PAS -DIRECT ACCESS AND CABIN INTERPHONE ANNOUNCEMENT -OPERATION

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PAS -BOARDING MUSIC SELECTION

General
Flight attendants use the cabin system control panel (CSCP) or cabin area control panels (CACPs) to select boarding music (priority 4).
Access
Touch BOARDING MUSIC on the cabin controls main menu to show the boarding music screen.
Controls
The boarding music selection screen gives control of these functions:
*
Boarding music on/off

*
Channel selection

*
Volume.

Touch ON to cause the boarding music to come on. Touch OFF to cause the boarding music to go off.
There are four channels of boarding music from each. Touch 1, 2, 3, or 4 to select a channel.
The volume indication shows green vertical bars to show the current volume.
Touch the left arrow to decrease the volume. Touch the right arrow to increase the volume.
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777 AIRCRAFT MAINTENANCE MANUAL

PAS -BOARDING MUSIC SELECTION

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777 AIRCRAFT MAINTENANCE MANUAL

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PAS -CONFIGURATION DATABASE PROGRAMMED ITEMS

General
The configuration database supplies details of the system operation. For the PAS, the database gives configuration data for:
*
Speaker drive modules (SDMs)

*
Speakers

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Ambient noise sensors (ANS)

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Passenger address areas

*
Volume

*
Chimes.

SDMs, Speakers, and ANSs
The configuration database identifies the number of SDMs, speakers, and ANSs. It assigns as many as four speakers to a SDM and identifies the type of announcements each speaker transmits. The database assigns each ANS to a SDM.
The database also identifies the location of each component.
Speaker Mute Assignments
When an attendant makes an announcement, the PAS mutes up to three nearby speakers. This prevents speaker feedback. The configuration database assigns the speakers to a cabin attendant handset.
Passenger Address Areas
The PAS can have up to six passenger address areas. The configuration database assigns each speaker to a PA area.
Announcement Types for Each Speaker
The configuration database identifies the announcement types (priority 1, 2A, 2B, 3A, 3B, 4) each speaker plays.
Volume Control Areas
The PAS adjusts the volume in an area. The configuration database identifies the speakers assigned to a volume control area.
Volume Reference Level
The PAS uses a volume reference level to adjust the volume above or below reference level. The reference level is the normal in-flight volume. The configuration database gives the reference level.
ANS Reference Level
The configuration database identifies the reference level each ANS uses to measure noise.
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PAS -CONFIGURATION DATABASE PROGRAMMED ITEMS

Chimes Types and Count
The configuration database identifies the types of chimes the PAS makes for each chime condition. It also identifies the number of chimes for each chime condition.
PA Area to Video Area Assignment
The configuration database matches PA areas to video areas. The configuration database assigns each PA area to one video area. It assigns each video area to one or more PA areas.
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PAS -CONFIGURATION DATABASE PROGRAMMED ITEMS

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PAS -PASSENGER ADDRESS FAILURE MESSAGE

Operation
The passenger address controller (PAC) of the PA/CI controller has continuous BITE. If the BITE finds a failure, the PAC sends a message to the cabin system control panel (CSCP) and the cabin area control panels (CACPs). This causes the CSCP and all CACPs to show a PA failure message on a pop-up window.
The pop-up window tells the flight attendants to push the PA NORM/ALT switch.
To clear the pop-up window, touch CLEAR or push the PA NORM/ALT switch. The PA NORM/ALT switch makes the alternate PAC operational. The PA NORM/ALT switch is on the attendant switch panel (ASP) at door 2 left.
　
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