Textron Cessna 172R - Page 366

SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
2
-
FAA
APPROVED
CESSNA
MODEL
172R
3.
MODE
ANNUNCIATORS
-
Displays
the
operating
mode
of
theÿv
transponder.
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4.
REPLY
INDICATOR
(R)
-
“R”
is
illuminated
momentarily
when
the
transponder
is
replying
to
a
valid
interrogation
and
during
the
18
±2
seconds
following
the initiation
of
an
Ident.
5.
MODE
SELECTOR
KNOB
-
Controls
application
of
power
and
selects
transponder
operating
mode
as
follows:
OFF-
Turns
set
off.
SBY
-
Turns
set
on
for
standby
power
and
code selection.
“SBY”
is
annunciated.
TST
-
Self-test
function.
The
transmitter is disabled.
All
display
segments
will
illuminate.
ON
-
Turns
set
on
and
enables
transponder
to
transmit
Mode
A
(aircraft identification)
reply
pulses.
ON
is
annunciated.
ALT
-
Turns
set
on
and enables
transponder
to
transmit
either
Mode
A
(aircraft
identification)
reply
pulses
and
>
Mode
C
(altitude
reporting)
pulses
selected
automatically by
the
interrogating
signal.
ALT
is
annunciated.
6.
VFR
CODE
BUTTON
(VFR)
-
Pressing
the
VFR
Button
will
cause
a
pre-programmed
Mode
A
reply
code
to
supersede
whatever
Mode
A
reply
code
was
previously
in
use.
Button
illumination
is controlled
by
the
RADIO
LT
dimming
rheostat
7.
CLEAR BUTTON
(CLR)
-
Pressing
the
CLR
button
will
delete
the last Mode
A
code
digit
entered.
8.
NUMERIC
KEYS
0-7
-
Selects
assigned
Mode
A
reply
code.
The
new
code
will
be transmitted
after
a
5-second
delay.
Figure
1.
Bendix/King
KT
76C
Transponder
with
Blind
Encoder
(Sheet
2
of
2)
S2-6
Feb
28/00
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