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AUDIO CONTROL PANEL
TRANSMIT EMER
VHF 1
NAV 1
SPEAKER HEADPHONE
NAV 2 ADF DME
ST MKR MUTE H'MIC
INT
VHF 2 HF 1 HF 2 PA
1 21 2
SPKR
ON
SPKR
OFF
MIC MASK
HI
SENS
LO
SENS
VHF 3
BOTH
I
D
V
O
I
C
E
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
5-6 For Training Purposes Only
Sept 04
Audio Control Panel Switch Operation
GX_05_009
TRANSMIT
EMER
Channel active - bar illuminates.
Only one pushbutton can be selected at a time.
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.
–
–
Microphone Selection
MIC/MASK
INT
ID/BOTH/VOICE
ID
Connect the MIC audio and PTT to the selected
COMM or NAV radios, or PA when pushed in.
– When pushed in, the headset
microphone is available. When pulled out, the
mask microphone is available.
– Adjusts the headset audio level. Connects
audio control panel(s) and external audio jacks.
Allows only NAV tone ident to be heard.
VOICE
BOTH
Allows only VOICE audio on NAV
frequency to be heard.
allows voice and ID to be heard
simultaneously.
• –
• –
• –
Speaker/Headphone
Speaker
ST switch
MKR/MUTE
H’MIC
Headphone
– Adjusts the audio level of the flight
compartment speakers.
Sidetone switch adjusts the level on
the speaker audio. Turns the speaker ON/OFF
unless oxygen mask is in use.
Marker beacon controls on-side
receiver sensitivity. Mute silences the marker
beacon audio.
Button out, interphone functions operate
in hot mic mode. Button in, connects microphone
to the radio key/interphone toggle switch on the
control wheel.
Adjusts the audio level of
headphone (master volume control).
–
–
–
–
TRANSMIT EMER
VHF 1 VHF 2 VHF 3 HF 1 HF 2 PA
VHF 1
NAV 1 NAV 2 ADF DME INT BOTH
VHF 2 HF 1 HF 2 PA
I
D 1 21 2
V
O
I
C
E
MIC MASK
VHF 3
SPEAKER HEADPHONE
ST MKR MUTE H'MIC
SPKR
ON
SPKR
OFF
HI
SENS
LO
SENS
As many radios frequencies can be
monitored by pulling out appropriate
button. (Listen only)
Single Channel Controls
NAV 1
NAV 2
– Idents from RMU 1.
– Idents from RMU 2.
Dual Channel Controls
Mid Position
1 Position
– Silent
– Ident RMU 1.
2 Position – Ident RMU 2.
TRANSMIT EMER
VHF 1
NAV 1
SPEAKER HEADPHONE
NAV 2 ADF DME
ST MKR MUTE H'MIC
INT
VHF 2 HF 1 HF 2 PA
1 21 2
SPKR
ON
SPKR
OFF
MIC MASK
HI
SENS
LO
SENS
VHF 3
BOTH
I
D
V
O
I
C
E
For Training Purposes Only
Sept 04
5-7
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
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.
The RMU controls all of the VHF COM tuning functions and allows emergency
tuning by the FMS. When an FMS tunes the radios, the digital signals from the FMS
enter the system where they act in much the same manner as if the RMU tuning knob
was being operated. This will allow the FMS to enter into the system in an organized
manner. For FMS operation, refer to the Honeywell Pilot’s Operating Manual.
The audio section of the VHF COM provides SELCAL outputs used for airplane
addressing by transmitting tones across a VHF COM channel.
VHF 1 AND 2 COMMUNICATIONS SYSTEMS
Two separate, but identical narrow bandwidth VHF communications systems (VHF 1,
VHF 2) which can be operated separately or simultaneously, are provided. These
systems are used to provide AM voice communication between the airplane and a
ground station and/or another airplane. Frequency tuning and mode selection is by
CRT pages and controls on the RMU.
The integrated communications units with transceivers (located in the forward
fuselage avionics bay) provide VHF communication (VHF COM) and Mode S
Transponder data link capabilities. The communication transceiver tuning range is as
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