T-45C TS, ADV & IUT ENG-21
CNI System
b.
Provides master volume control for COMM
radios, the ICS, and VOR/ILS, TACAN, and
MKR audio and identification signals
c.
Allows selection of COMM 1, COMM 2, VOR,
TACAN, or MKR audio
(1) Switch Up turns on audio of selected
COMM/NAV
(2) Switch Down turns off audio of selected
COMM/NAV
d.
Provides HOT/COLD MIC selection
e.
MIC switch: two-position toggle switch
(1) HOT: permits intercom between cockpits/
ground crew without depressing
microphone switch
(2) COLD: permits intercom between cockpits/
ground crew only when microphone switch
is depressed
f.
ALT-NORM switch: two-position toggle switch
(1) ALT: selects alternate audio amplifier for
use when normal amplifier fails. Amplifies
all inputs at fixed audio level, i.e. receiver
volume inoperative
(2) NORM: selects normal audio amplifier
g.
ICS volume control knob: When ALT-NORM
switch in NORM, adjusts intercom reception
volume independent of individual equipment
volume settings
h.
RCVR volume control knob: adjusts volume of
all receiver audio signals delivered to headsets.
With exception of marker beacon audio, volume
of all COMM/NAV signals is adjustable on
individual control panels
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