Textron Cessna 172R - Page 365

CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
2
-
FAA
APPROVED
1.
IDENT
BUTTON
(IDT)
-
When
depressed,
selects
special
identifier
pulse
to
be
transmitted
with
transponder
reply
to
effect
immediate
identification
of
the
airplane
on
the
ground
controller’s
display.
("R"
will
illuminate
steadily
for
approximately
18
seconds. Button illumination
is
controlled
by
the
avionic
light
dimming
rheostat.
2.
ALTITUDE
DISPLAY
-
Displays
the
pressure
altitude
on
the
left'
side
of
the
display.
The
display
is
in
hundreds
of feet.
"FL"
is annunciated
to
indicate
Flight
Level altitude.
Flight
Level is
a
term
to
indicate
that
the
altitude is
not
true
altitude,
but barometric altitude
which is
not
corrected
for
local
pressure.
For
Example,
"FL-040"
corresponds
to
an
altitude
of
4000
feet,
meaning
sea
level
pressure
of
29.92
inches
of
mercury.
The
Flight
Level altitude
is
only
displayed
when
the altitude
reporting
is
enabled,
i.e.
in
Altitude
mode.
If
an
invalid
code
from
the altimeter
is detected dashes
will
appear
in
the
altitude
window.
Altitude
reporting
is
disabled
if
the altitude
window is blank
or
has dashes.
Figure
1.
Bendix/King
KT
76C
Transponder
with Blind
Encoder
(Sheet
1
of
2)
Dec
2/96
S2-5
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