Textron Cessna 172R, Pilot Operating Handbook

Page: 365 / 500

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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