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When the pilot’s audio control panel EMER/NORM switch is set to EMER, the pilot’s
headset is connected directly to NAV 1 navigation radio and VHF 1 communication
radio. Most of the system is bypassed making most audio control panel functions
inoperative. Cockpit speakers are disabled and all warnings and tones are heard
through the headsets. The observers station, passenger address and interphones are
disabled in emergency mode.
Vol. 1 05--20--2
COMMUNICATIONS
Audio Integrating System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Passenger Address System Interface Diagram
Figure 05---20---1
STA
LAVATORY
28 VDC BATT BUS 1
PASSENGER
ADDRESS/CABIN
INTERPHONE
CONTROLLER
SEAT BLT
NO SMKG
RAMP
PASSENGER
SERVICE
UNITS
ATTENDANT SWITCHES
PA MIC
PA IN
PA PTT
CHIME IN
PA SWITCH
EMG SWITCH
CALL SWITCH
CHIME
SWITCHES CALL,
EMERG, ATT, PA ENG 1 & 2 VIB
MON UNIT
PWR / FUEL
SWITCH
CRV CH 1
BOARDING
MUSIC
PASS BRIEFER
TAPE
BOARDING
MUSIC MUTE
2ND LAVATORY
GALLEY
CABIN
SPEAKERS
ATTENDANT HANDSET
AUDIO
ELECTRONICS
CONTROL UNIT
COCKPIT
INTERPHONE
CONTROL UNIT
Vol. 1 05--20--3
COMMUNICATIONS
Audio Integrating System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Audio Control Panel
Figure 05---20---2
Audio Control Panel
Center Pedestal
Transmit Selector
Selects desired communications system and
energizes channel. Only one channel at a
time may be selected.
Receive Pushbuttons
Press to monitor respective
navigation or communication
system. Press again to deselect.
Switches are lit when pressed.
Any number of audio sources can
be monitored at the same time.
Rotate clockwise to increase
volume.
Inoperative at observer’s
audio control panel.
NOTE
SPKR
Press to select and deselect audio on
the flight compartment speakers.
Rotate to adjust volume.
Inoperative at observer’s
audio control panel.
NOTE
Radio Transmit (RT)
Intercom (IC)
Used to transmit on radios or
passenger address system.
RT -- When held, permits
communication using
headset or oxygen mask
microphones.
IC -- Provides hot mic talk
through interphone system.
MASK/BOOM
MASK -- Oxygen mask microphone
of respective station is active.
BOOM -- Boom microphone of
respective station is active.
VOICE/BOTH
VOICE -- Station
identification is filtered
out allowing only voice
signals to be audible.
BOTH -- Station
identification and voice
signals are audible.
EMER / NORM (Lever--locked)
NORM -- Normal functions.
EMER -- Bypasses audio electronics
control unit.
Pilot has two--way communication
on VHF 1, audio on NAV 1 and
aural warnings.
Copilot has two--way communication
on VHF 2, audio on NAV 2 and
aural warnings.
Observer has aural warnings only.
Vol. 1 05--20--4
COMMUNICATIONS
Audio Integrating System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Pilot’s Control Wheel (Copilot’s opposite)
Figure 05---20---3
Pilot’s Control Wheel
(Copilot’s Opposite)
Radio Transmit (RT)
Intercom (IC)
Used to transmit on radios
or passenger address
system.
RT -- When held, permits
communication using
headset or oxygen mask
microphones.
IC -- Provides hot mic talk
through interphone
system.
Vol. 1 05--20--5
COMMUNICATIONS
Audio Integrating System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
B. Ground Crew Interphone
There are four external interphone stations in the aircraft in the following locations:
S External service panel
S Refuel/defuel panel
S Avionics bay
S Aft equipment bay
When pressed, the CALL switch on the interphone or external service panels allows
either position to call the other. When either switch is pressed and released, both lights
are illuminated for 30 seconds and a two tone chime sounds in the aircraft.
GND Crew Interphone <2040,1205>
Figure 05---20---4
Typical Interphone Panel
Avionics Bay,
Rear Equipment Bay,
Refuel/Defuel Panel
Interphone Panel
Center Pedestal
External Service Panel
Right Forward Fuselage
CALL
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