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a counterclockwise direction decreases the back-lighting intensity.
Figure 3-1. Remote Frequency Display (RFD) (Sheet 2 of 2)
3-7
TM 1-1520-248-10
RADIO MON NAV
VOX MIC
HOT
MIC
VOX ON
NORM
ICS OFF
C
S
C
1 2 3 4 5 A B
1 2
1 2 3
6 5
7 4
VOL
ICS
PVT
RMT
1
2
3
4
5
406075-659-2
G7790
CONTROL/INDICATOR FUNCTION
1. VOL control knob Rotating volume control knob regulates audio output level of the ICS.
Turning the knob clockwise increases volume, counterclockwise decreases
volume.
2. RADIO MON switches Control audio signal of communication radios to the crewmember headsets,
1 (FM-1), 2 (UHF), 3 (VHF), 4(HF), 5 (FM-2). Pushing knobs in turns audio
to associated, radio ON. Pulling outward turns audio OFF. Turning knobs
clockwise increases volume, counterclockwise decreases volume.
3. NAV switches A. Controls audio volume of ATAS signal.
B. Adjusts radar warning and laser detection audio volume
B. Adjusts TACAN audio volume.
4. MIC switch When dynamic mike is being used, this switch is to be used in the “1”
position. When the tempest mike is being used, this switch is to be used in
the “2” position.
Figure 3-2. Communication System Control (CSC) Panel (Sheet 1 of 2)
3-8
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
5. Transmit selector switch Controls radio transmission of the respective crewmember. The PVT position
is not connected. The ICS position allows intercommunication with the use of
the cyclic transmit switches or floor mike switches.
Position 1 through 5 allows transmission on the respective radio when the
cyclic transmit switch is pressed to full detent or when the floor mike switch
is pressed.
RMT position has no function on CPG ICS. If the pilot ICS is in the
RMT position, the five-position radio select switch on collective becomes a
hands-on way of selecting a radio.
6. VOX Control Allows adjustment of threshold required to transmit while operating in VOX
on.
7. Rotary Switch
HOT MIC Allows hands off communication.
VOX ON Allows voice activated communication.
NORM Allows normal communication with both CSC panels set to NORM.
ICS OFF Two-way cockpit communication is disabled.
Figure 3-2. Communication System Control (CSC) Panel (Sheet 2 of 2)
3-9
TM 1-1520-248-10
UP
F
RE
Q
KYB
D
DN
RMT ICS START
CHAN UP
ON
ON
OFF
EXT
RET
ENGA
DISENG
I D L
ER L
E
F
RE
Q L
T
S
RCH
NV
G
OFF
ON
L R
L R
RP
M
+
-
1 2
4 3
5
PILOT
1
2
3
CPG
CONTROL/INDICATOR FUNCTION
1. Communication RMT/ A two-position switch that allows the pilot two ways of selecting the radio
ICS switch (Not installed that is to control transmission. In the RMT (remote) position, transmitter
on helicopters) selection is controlled with the radio select switch on the collective control
head. In the ICS position, transmitter selection is controlled with the transmit
selector switch of the CSC control panel. Communication radios cannot be
monitored with RMT/ICS switch in RMT position and transmit selector switch
in PVT or ICS position.
2. CHAN select switch  A four-position, center spring-loaded to neutral switch that works in
Pilot collective head and conjunction with the MFD, MFK, and RFD.
CPG CSC panel
Pressing the switch to the CHAN UP position changes the channel number
and frequency of the radio currently selected for transmitting to the next
higher channel and frequency stored on the frequency list.
If the COMM page is being displayed, pressing the switch to the right or
FREQ position, brings up the Frequency page with channel numbers and call
signs for the selected radio on the MFD.
Figure 3-3. CSC Switches (Sheet 1 of 2)
3-10
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
Pressing the switch to the DN (down) position changes it to the next lower
channel and frequency stored.
Pressing the switch to the left, or KYBD (keyboard), position activates the
keyboard, if a manual frequency is currently selected on the RFD, to allow
the entry of manual channels and frequencies for the radios selected for
transmitting.
3. Radio select switch A five-position switch that is used to select a radio for transmit. Pressing to
the 1 (upper left) position selects FM-1, 2 (upper right) selects UHF, 3 (lower
　
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