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ESNTL BUS switch is set to the RUN position. switch and radio select switch.
NOTE b. Controls and Functions. Refer to figure 3-2 for
functions of the CSC switches on the pilot collective
Ensure that the MIC switch is in the proper control head.
position for the type of microphone being
used. c. Operation. The operation of these switches is
covered in detail in the procedural step sections for
(2) Press in all required RADIO MON knobs to each radio beginning with paragraph 3-10.
activate the audio of the communication radios and
adjust volume as desired. During prestart, if hands off
communications are required between crewmembers, 3-8. TRANSMIT SWITCHES AND SELECT
place the rotary switches of both CSC panels in the KNOB  PILOT/CPG CYCLIC GRIP AND FOOT
HOT MIC position (fig. 3-2) or the VOX ON position may be selected. For normal intercom operations, place OPERATED.
the rotary switch to the NORM position and set the
transmit selector switch to the ICS position. This will a. Description. There are two switches on the pilot
allow intercommunications with the cyclic transmit or cyclic grip that are tied into the communication system.
floor mike switches. The DSPL SEL switch allows the pilot to call up the
COMM or FREQ pages on the MFD without taking his
(3) The maintenance crew stations at the nose hands off the controls. The ICS/RADIO switch is used
and left and right pylons are monitored at the pilot and for transmitting on the intercom or radios. The CPG
CPG stations when the CPG rotary switch is in NORM, cyclic is equipped with the same ICS radio switch. The
HOT MIC, or VOX ON position. Placing the CPG rotary function of these switches is covered in figure 3-5. A
switch to the ICS OFF position turns off the audio from foot-operated mike switch (pilot and CPG) is located at
the crew station. Audio volume of the intercom system each side of the center console, between the center
is controlled with the VOL knob of each CSC panel. console and cyclic control stick. The depressed position
3-4
TM 1-1520-248-10
of the foot-operated switch keys the radio or interphone Navigation System (EGI) unit and provides distribution
selected. of all radio and ICS audio signals. The ADU interfaces
with the Control Display Subsystem (CDS), COMSEC,
b. Controls and Function. Refer to figure 3-5 for and ATHS/(IDM). Circuit protection is provided by a
functions of the ICS/RADIO switch and DSPL SEL circuit breaker located in the overhead circuit breaker
switch on the pilot cyclic grip. panel. In the event of an ADU failure, an ADU FAIL
CAUTION message is displayed on the MFD and the
only communication that may be available is through
3-9. AUDIO DISTRIBUTION UNIT (ADU). FM-1 radio. All warning, caution, and advisory audio is also disabled.
The audio distribution unit is located in the avionics
compartment forward of the fuel cell above the
Embedded Global Positioning System/Inertial
3-5
TM 1-1520-248-10
1
23
4
5 P
H
I C
I C
TEST
BRT
PH
I C
PH
406075-719
H0065
1 2
3
4
3
6
P
H
I C
5
CONTROL/INDICATOR FUNCTION
1. Channel indicator
M1-M5 Indicates manual frequency selected and the radio number it is assigned to.
01-17 Indicates channel selected, channels are assigned 17 per radio. HF has 9
transmit and 9 receive channels.
C Indicates cue frequency selected on FM-1 or FM-2 when an AN/ARC-201 is
installed.
FH Indicates frequency hopping.
AJ Indicates anti-jam mode.
EM Indicates emergency mode.
FS Indicates frequency scan.
Figure 3-1. Remote Frequency Display (RFD) (Sheet 1 of 2)
3-6
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
2. CIPH Indicator Appears adjacent to frequency when CIPH mode is selected. CIPH deletes
from display when CIPH mode is deselected.
3. CIPH switches When the upper left switch is pressed, the transceiver controlled by the CPG
becomes encoded. When the upper right switch is pressed, the transceiver
controlled by the pilot becomes encoded. CIPH deletes from display when
cipher mode is deselected.
4. Display screen Displays channel and frequency to which each radio is tuned. Arrows indicate
which radio each crewmember has selected for transmit.
5. TEST switch Momentary pressing changes input from one MCPU to the other. Holding the
switch down will display a test pattern to confirm proper operation of the
display.
6. BRT control rheostat The rheostat is labeled BRT. Turning the BRT control knob in a clockwise
direction increases the back-lighting intensity. Turning the BRT control knob in
　
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