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MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 256
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23 - COMMUNICATIONS
23-73-00 PASSENGER ADDRESS SYSTEM
DESCRIPTION
CONTENTS:
General
Sources
Priority
PA level
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MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
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PASSENGER ADDRESS SYSTEM DESCRIPTION
GENERAL
The CIDS directors accept audio signals from the
various PA sources in the aircraft. The active director
assigns priorities to each source.
It transmits the signal in digital form via the four
top-line data buses to the type A DEUs and, OPTIONALLY
via the Passenger Entertainment System Controller
(PESC), to each Passenger Control Unit (PCU).
The type A DEUs send the signal to the cabin
loudspeakers for broadcasting.
The announcements can be heard, at each passenger seat,
with a headset.
SOURCES
A PA announcement can be manually initiated from the
cockpit and from the cabin.
The announcement from the cockpit can be initiated
with :
- the cockpit handset,
- other equipment: handmic, boomset mic,
oxygen-mask mic in conjunction with the Audio
Control Panels (ACPs),
- the N/S and FSB switches set to ON,
The announcement from the cabin can be initiated with:
- the attendant handsets,
- the Forward Attendant Panel (FAP): from which
the prerecorded announcements, stored in the
PRAM, can be selected and initiated, as the
Boarding Music (BGM),
- If a Video System is installed, PA
announcements can be initiated from the Video
Control Unit (OPTIONAL).
A PA announcement can be automatically initiated from
the PRAM when:
- the N/S or FSB cockpit switches are set to AUTO
and according to the airline definition,
- a cabin decompression occurs.
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TMUCI2N03-P01 LEVEL 3
PASSENGER ADDRESS SYSTEM DESCRIPTION
EFFECTIVITY 23-73-00 Page 3
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PASSENGER ADDRESS SYSTEM DESCRIPTION
PRIORITY
The following are the basic levels of priority:
- 1st priority: FLIGHT COMPARTMENT,
- 2nd priority: CABIN ATTENDANT STATIONS,
- 3rd priority: PRERECORDED ANNOUNCEMENT (if
installed),
- 4th priority: BOARDING MUSIC and/or
ENTERTAINMENT SYSTEM (if installed).
As an OPTION the FWD ATTND STATION could have the 2nd
level of priority, in this case the other ATTND
STATIONS will have the 3rd level of priority.
The levels of priority and the defined options are
programmed in the CABIN Assignment Module (CAM).
PA LEVEL
The volume of PA announcements can be automatically
adjusted if several conditions are met.
It is the active Director which establishes the level
according to the software, sending the level setting
to each individual type A DEU. Then the type A DEUs
perform the required amplification.
When an engine is running, the PA volume is increased
automatically by +6dB.
The PA volume is also increased by +4dB in the event
of cabin depressurization.
Depending on software, PA level may be adjustable via
PTP menu screens.
TMUCI2N03-T01 LEVEL 3
EFFECTIVITY 23-73-00 Page 4
Apr 30/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 260
ALL
23 - COMMUNICATIONS
23-73-00 PASSENGER ADDRESS SYSTEM
OPERATION
CONTENTS:
Passenger Announcement from Cockpit
Passenger Announcement from Cabin
TMUCI2O03 LEVEL 3
EFFECTIVITY 23-73-00 Page 1
Apr 30/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 261
ALL
PASSENGER ADDRESS SYSTEM OPERATION
PASSENGER ANNOUNCEMENT FROM COCKPIT
HANDSET
A handset is mounted on the cockpit center pedestal
and contains a Push To Talk (PTT) switch.
Pressing on the Push To Talk switch keys the Passenger
Address system, overriding lower priority Passenger
Address sources and broadcasting the speech over all
Passenger Address loudspeakers.
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