TM 1-1510-224-10
(5)
Transmitter-intercom selector switch. The
transmitter-intercom selector switch, placarded PVT,
ICS, 1 5, is used to select which transceiver the
microphone is connected to when the user's control
wheel microphone switch is depressed to the second
level or the respective cockpit floor microphone switch is
depressed,
and
routes
the
selected
transceiver's
received audio to the headset, regardless of the whether
transceiver audio monitor control is on or off.
(a)
PVT. This position is not used in
this installation.
(b)
ICS. Selects intercom system.
Intercom
will
be
activated
when
control
wheel
microphone switch is depressed to the first or second
level, or when cockpit floor microphone switch is
depressed.
(c)
Position 1. Selects VHF-AM # 1
transceiver.
(d)
Position
2.
Selects
VHF-FM
(SINCGARS) transceiver or VHF-AM # 2 transceiver
depending upon the position of the AM/FM alternate
communication selector switch (pedestal extension, fig.
2-14.
(e)
Position 3. Selects # 1 UHF
transceiver.
(f)
Position 4. Selects HF transceiver
or VOW transceiver.
(g)
Position 5. Selects # 2 UHF
transceiver (BU VOW).
(6)
Intercom mode selector switch. The
three-position intercom mode selector switch, placarded
HOT MIC, NORM, ICS OFF, controls the operating
mode of the intercom system.
(a)
HOT MIC. Microphone will be
continuously connected to intercom system except when
transmitter-intercom
selector
switch
is
set
to
a
transceiver, and control wheel microphone switch is
depressed to the second level, or cockpit floor
microphone switch is depressed.
(b)
NORM.
Microphone
will
be
connected to intercom system only when the control
wheel microphone switch is depressed to the first level.
If the transmitter-selector switch is set to the ICS
position, the intercom will also be activated when the
control wheel microphone switch is depressed to the
second level.
(c)
ICS OFF. Deactivates intercom
system.
AP01565 C
Figure 3-2. VHF-FM/VHF/AM Alternate Communication Switch Panel
3-4
