Cessna 172R, Operating Handbook

Page: 439 / 500

CESSNA
MODEL 172R
SECTION
9 -
SUPPLEMENTS
SUPPLEMENT 15
-
FAA
APPROVED
3.
ALTITUDE ARM (ARM)
BUTTON
-
When pushed, will
toggle altitude
arming on or
off.
When ALT ARM is
annunciated, the
autopilot will
capture
the altitude alerter
displayed altitude (provided
the aircraft is climbing or
descending in VS
to
the displayed altitude). ALT hold
arming when
the autopilot
is
engaged is automatic upon
altitude alerter altitude selection via the
rotary
knobs. Note
that the alerter functions
are independent of the arming
process thus providing full
time alerting, even when the
autopilot is disengaged.
4. ALTITUDE
ALERTERWERTICAL SPEED/BARO SETTING
DISPLAY
--
Normally displays the
altitude alerter selected
altitude. If the UP or DN
button
is
pushed while in VS hold,
the
display changes to
the command reference for the VS
mode in FPM for 3 seconds. If the BARO button is pushed,
the display changes
to
the autopilot baro setting in either IN
HG
or HPA for
3
seconds.
NOTE
This display may be dashed for
up
to 3
minutes on
start
up
if
a
blind encoder is
installed
which requires
a warm-up period.
5. ALTITUDE ALERT
(ALERT) ANNUNCIATION
-
Illuminates
continuously in the region of from
200 to
1
000
feet from the
selected altitude if the airplane was previously outside of this
region. Flashes (1) for
two
seconds the first time the
airplane crossed the selected
altitude and
(2) continuously in
the 200
to
1000 feet region
if the airplane was previously
inside of this region (i.e. at the selected altitude).
Associated with the visual alerting is
an aural alert
(5 short
tones) which occurs
1000
feet from
the selected altitude
upon
approaching
the altitude and
200
feet from the
selected altitude on leaving the altitude.
Figure 3. Bendix/King
2-Axis KAP
140
Autopilot with Altitude
Preselect, Operating Controls
and Indicators (Sheet 2)
Revision 1
S15-13