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The announcement will interrupt any entertainment system that may be operating. To
ensure priority access to the system, all other PA transmissions are overridden when
the pilot pushes the PA switch on the intercom control panel.
Passenger Address System --- Block Diagram
Figure 05---20---7
DC
BAT
INTERPHONES,
HANDSET
AUDIO ELECTRONICS
CONTROL UNIT
CABIN
SPEAKER
NETWORK
EICAS DATA
CONCENTRATOR
UNITS
ENGINES
OFF,
VOLUME
PASSENGER
ADDRESS
ELECTRONICS
UNIT/AMPLIFIER
TONE
GENERATOR
(CHIMES)
LAVATORY
SPEAKER
GALLEY
SPEAKER
COCKPIT
VOICE
RECORDER
REV 56, Jan 31/03
Vol. 1 05--20--10
COMMUNICATIONS
Audio Integrating System
Flight Crew Operating Manual MASTER
CSP A--013
E. Intercom Control Panel
The intercom control panel is located on the centre pedestal and is used to select one
of four communication modes. When a button is pressed the labeled mode is activated
and any previous mode is deactivated.
To make an announcement from the flight compartment:
S Set the audio control panel rotary transmit selector to PA
S Press the PA pushbutton on the intercom control panel
S Use any press to talk switch to transmit.
The PA indicator light on both flight attendant handset cradles will illuminate (green)
and the PA pushbutton on the intercom control panel will illuminate (green).
Pressing the CHIME pushbutton, only sounds a high-low chime in the passenger
compartment (there are no indicator lights for this action).
When the CALL is pressed, it illuminates green and sounds a high-low chime in the
passenger compartment. The green FLT indicator light on both flight attendant’s
handset cradles illuminate and a red light comes on in the mid-cabin overhead exit sign.
The EMER button is used to notify the flight attendants of an in--flight emergency.
When activated, the EMER indicator light on the intercom panel, flashes (amber) and a
high-low chime sounds. In the passenger compartment, the amber EMG light on both
flight attendant stations, flashes on the handset cradles and a red light flashes on the
mid-cabin overhead exit sign.
Vol. 1 05--20--11
REV 56, Jan 31/03
COMMUNICATIONS
Audio Integrating System
Flight Crew Operating Manual
CSP A--013
MASTER
Intercom Control Panel
Figure 05---20---8
CHIME Switch
Pressed in to chime cabin
speakers. No visual indicators
come on, either on the pedestal
or at attendants’ handsets.
Public Address (PA) Switch/Light (green)
Normal flight compartment/PA calls on cabin
interphone.
Pressed in -- Flight crew to cabin public
address.
Lit (green) -- In use.
The flight crew have PA priority. Used in
conjunction with PA position on audio control
panels.
Emergency (EMER)
Switch/Light
Emergency call on cabin interphone system.
Pressed in -- Emergency call to flight attendants.
Flashes lamp on attendant’s handset and interphone
control unit and single two--tone chime sounds.
Flashing (amber) -- Emergency call from flight
attendants. Single two--tone chime sounds on flight
compartment speaker.
CALL Switch/Light
Normal attendant/flight compartment calls on cabin interphone.
Pressed in -- Flight compartment call to flight attendant’s, lamp on
attendant’s handset and interphone control unit come on and
single two--tone chime sounds in cabin.
Lit (green) -- Normal call to flight crew. Single two--tone chime
sounds on flight compartment speaker.
F. Passenger Service Units
An attendant call button is installed in each overhead passenger service unit. When a
passenger activates the attendant call button, the cabin speakers sound a high tone
chime and an amber light on the passenger service unit illuminates, a ceiling mounted
call light comes on.
When the flight compartment NO SMKG or SEAT BLTS switch is turned on, the
passenger compartment speakers sound a low tone chime and the NO SMKG and
SEAT BLTS lights are illuminated.
REV 56, Jan 31/03
Vol. 1 05--20--12
COMMUNICATIONS
Audio Integrating System
Flight Crew Operating Manual MASTER
CSP A--013
G. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
AUDIO PILOT DC BAT Q6
AUDIO OBS DC BUS 1 1 Q8
Comm Audio System AUDIO C/PLT DC BAT Q7
Systems
y
AUDIO OBS DC BUS 2 2 H4
AUDIO PILOT DC ESS 4 D1
Tape Player PASS ADDR DC BAT 1 Q5
Vol. 1 05--25--1
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