T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
(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)
(i)
TEST (spring loaded to ON): BIT
function in receiver-transmitter self
interrogates Modes 1, 2, 3/A, or C
(ii) ON: permits receiver-transmitter
reply to Modes 1, 2, 3/A, or C
interrogations
(iii) OUT: disables the receiver-
transmitter 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
(i)
GO (green): illuminates if system
BIT successful
(ii) NO GO (red): illuminates if
system BIT fails
(9-98) Original
Page 27-126
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