T-45A UJPT, E2-C2, ADV, & IUT Eng-21
CNI System
e.
Mode 2: displays a preset four-digit
code with 4,096 combinations for
security identification (not normally
used)
f.
Mode 3/A four-digit reply code number
for air traffic control
g.
Mode 4 controls and lights: not
functional
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-trans-
mitter for the mode selected
i.
RAD TEST switch: permits reply to
test mode interrogations from test
equipment (for maintenance use only)
j.
Test lights (2): functional when RAD
TEST switch is set to RAD TEST or
when mode select/test switch(es) set
to TEST
(1) GO (green): illuminates if system
BIT successful
NOTE: Illuminates when tran-
sponder is transmitting a reply to
an interrogation.
(2) NO GO (red): illuminates if system
BIT fails
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