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audio control panel. A headphone and microphone jack are installed at each location. Hand
microphones with a PressToTalk
(PTT) switch are attached to the front of each control wheel.
Microphone and headset jacks are installed at the following external airplane locations:
· Forward and rear externals services panel.
· Aft equipment bay.
· Avionics bay.
Forward External Services Panel Interphone Station
GF0610_003
HDPH MIC
NLG Bay Light
ON
COMMUNICATIONS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
06−10−2
INTERPHONE COMMUNICATION (CONT'D)
Aft External Services Panel Interphone Station
GF0610_004
Aft Equipment Bay Interphone Station
GF0610_005
Avionics Bay Interphone Station
GF0610_006
COMMUNICATIONS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
06−10−3
INTERPHONE COMMUNICATION (CONT'D)
Control Wheel Radio Key / Control Wheel Toggle Switch (If Installed)
Each control wheel has a radio key which activates the selected radio transmitter.
If installed,
each control wheel has a toggle switch which activates the selected radio transmitter or the
interphone.
GF0610_007
(radio key/interphone
toggle switch located
behind)
Pilot control wheel is
shown, copilot’s opposite.
IF INSTALLED
NOTE
(radio key
located behind)
AUDIO CONTROL PANEL
The Audio Control Panels (ACPs) operate independently to the remote COMM and NAV units and
provide onside/
crossside
selection. They also control the audio to and from the radios, intercom,
PA and aural warning system.
AUDIO CONTROL PANEL INPUT SCHEMATIC
GF0610_008
TCAS
EGPWS
INTERPHONE AUDIO
(flight/service)
AURAL WARNING SYSTEM
PA SYSTEM
MICROPHONE AUDIO
(hand, boom and mask
mics.)
AUDIO − OPTIONAL SYSTEMS
AUDIO CONTROL PANEL
COMMUNICATIONS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
06−10−4
AUDIO CONTROL PANEL SWITCH OPERATION
GF0610_009
TRANSMIT/EMER
MICROPHONE
SELECTION
SPEAKER/
HEADPHONE
NAV3
The audio control switch panel operation is as follows:
Transmit/Emer
The channel is active when the associated bar illuminates. Only one push-button can be selected
at a time.
• EMER − When pressed, the microphone is connected directly to the on-side VHF (COMM)
transceiver and the audio is connected directly to the airplane’s headphone. This mode
disables all other audio control unit modes. When the EMER key is pressed, headphones
are required regardless of the position of the MIC/MASK. Both the oxygen mask and
headphones are to be worn simultaneously in EMER and MASK operation with EMER
selected.
Microphone Selection
Connects the MIC audio and PTT to the selected COMM or NAV radios, or PA when pushed in.
• MIC/MASK − When selected in, the headset microphone is available. When selected out,
the mask microphone is available and intercom audio is connected to the speaker
(regardless of the position of the SPKR switch).
• INT − Adjusts the intercom headset audio level. When selected out, the audio panel is
connected to other audio control panel(s) and to external audio jacks.
• ID/BOTH/VOICE − “ID” − Allows only NAV tone ident to be heard . “VOICE” − Allows only
VOICE audio on NAV frequency to be heard. “BOTH” − allows voice and ID to be heard
simultaneously .
Speaker/Headphone
• Speaker − Adjusts the audio level of the flight compartment speakers.
• ST switch − Sidetone switch adjusts the speaker audio level in transmit. Turns the speakers
ON/OFF unless oxygen mask is in use.
• MKR/MUTE − Marker beacon controls on-side receiver sensitivity. Mute silences the marker
beacon audio. Rotating MUTE selects HI or LO SENSitivity.
• H’MIC − Button selected out, interphone functions operate in hot mic mode. Button selected
in, connects microphone to the interphone PTT function.
• Headphone − Adjusts the audio level of headphone (master volume control).
COMMUNICATIONS
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
06−10−5
RADIO COMMUNICATION SYSTEM
The capability for controlling the operating modes, frequencies and codes can be accomplished by
using the Radio Management Unit (RMU) which is the central control unit for the entire radio system.
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