Textron Cessna 172R - Page 368

SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
2
-
FAA
APPROVED
CESSNA
MODEL
172R
2.
Mode
Selector
Knob
-
ON.
NOTES
•
During
normal
operation
with
Mode
Selector
Knob
in
ON
position,
reply
indicator
flashes,
indicating
transponder
replies
to
interrogations.
•
Mode
A
reply
codes
are
transmitted
in ALT
also;
however,
Mode
C
codes
are
suppressed
when
the
Mode
Selector
Knob
is
positioned
to
ON.
3.
IDT
Button
-
DEPRESS
momentarily
when instructed
by
ground
controller
to
“squawk
IDENT”
("R"
will
illuminate
steadily
indicating
IDENT
operation).
TO
TRANSMIT
MODE
C
(ALTITUDE REPORTING)
CODES
IN
FLIGHT:
1.
Transponder
Code
Selector
Knob
-
SELECT
assigned
code.
2.
Mode
Selector
Knob
-
ALT.
•
When directed
by
ground
controller
to
“stop
altitude
squawk”,
turn
Mode
Selector
Knob
to
ON
for
Mode
A
operation
only.
•
Altitude
transmitted
by
the
transponder
for
altitude
squawk
and
displayed
on
the
KT
76C
panel
is
pressure
altitude
(referenced
to
29.92”)
and
conversion
to
indicated altitude
is
done
in
the
ATC
computers.
TO
SELF-TEST TRANSPONDER
OPERATION:
1
.
Mode
Selector
Knob
-
TST
Check
all
displays.
2.
Mode
Selector
Knob
-
SELECT
desired
function.
NOTES
S2-8
Dec
2/96
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