T-45C TS, ADV & IUT ENG-21
CNI System
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
(2) NO GO (red): illuminates if system BIT fails
k.
Antenna (ANT) switch
(1) TOP: selects forward antenna
(2) DIV: diverse setting, antenna is
automatically selected
(3) BOT: selects aft antenna
4.
Aircraft interfaces--IFF System (Transponder)
a.
Power: 28 VDC essential services bus
Fig 10: CNI Input
Power Sources
b.
Logic that enables and controls selection of the
various RT operating modes including BIT
c.
Receives digitally encoded altitude supplied by
the fwd cockpit barometric altimeter
d.
Transmits signals on fwd or aft antenna
e.
Interfaces with ground-based, shipboard, and
airborne stations for identification and air traffic
control purposes
f.
When activated, ejection seat initiates
transmission of emergency code 7700
Page 21-25
(9-98) Original
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