T-45C TS, ADV & IUT ENG-21
CNI System
(2) KIT: not functional
(3) ANT: illuminates during self test to
indicate antenna function failure
c.
Identification of position (I/P) switch
(1) IDENT: initiates identification reply for
approximately 20 seconds
(2) OUT (spring loaded from IDENT): prevents
triggering of reply
(3) MIC: permits identification reply to be
transmitted by pressing microphone switch
d.
Mode 4 controls and lights: not functional
e.
Mode 3/A code selectors: selects and displays
Mode 3/A four-digit reply code number for air
traffic control
f.
Mode 1 code selectors: selects and displays
Mode 1 two-digit reply number for security
identification (not normally used)
g.
Mode 2: displays a preset four-digit code with
4096 combinations for security identification
(not normally used)
h.
Mode select/test switches (4)
(1) TEST (spring loaded to ON): BIT function
in receiver-transmitter self interrogates
Modes 1, 2, 3/A, or C
(2) ON: permits receiver-transmitter reply to
Modes 1, 2, 3/A, or C interrogations
(3) OUT: disables the receiver-transmitter for
the mode selected
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