Cessna 172R, Operating Handbook

Page: 435 / 500

CESSNA
MODEL 172R
SECTION 9
-
SUPPLEMENTS
SUPPLEMENT 15
-
FAA APPROVED
4.
HEADING (HDG) MODE SELECTOR BUTTON
-
When
pushed, will
select the Heading mode, which commands the
airplane
to turn to
and
maintain
the heading selected by
the
heading bug
on the Directional Gyro or HSI (if installed). A
new heading may be selected
at
any time and will result in
the airplane turning
to
the new heading. The button can also
be used
to
toggle between HDG and ROL modes. For
airplane serials 17280831 thru 17281118
not
incorporating!
Honeywell Service Bulletin
KC140-M1, this button can also be
used
to
engage the autopilot in HDG mode.
5.
NAVIGATION (NAV) MODE SELECTOR BUTTON
-
When
pushed, will
select
the
Navigation mode. This mode provides
automatic beam
capture
and tracking
of VOR,
LOC, or GPS
signals as
selected
for presentation on the
#1
CDI. NAV
mode is recommended for enroute
navigation tracking.
6. APPROACH (APR) MODE
SELECTOR
BUTTON
-
When
pushed, will select the Approach mode.
This mode
provides
automatic beam
capture
and tracking of VOR, GPS,
LOC and
Glideslope (GS) on an ILS, as selected for presentation on #1
CDI. APR mode tracking
sensitivity is recommended
for
instrument approaches.
7. BACK COURSE APPROACH (REV) MODE BUTTON
-
This
button is active only when the coupled navigation receiver is
tuned
to
a LOC/ILS frequency. When pushed will select the
Back Course approach mode. This mode functions identically
to
the approach mode
except
that the autopilot response
to
LOC signals is reversed. Glideslope is locked
out
with REV
mode.
8. ALTITUDE HOLD (ALT) MODE SELECT BUTTON
-
When
pushed, will select the altitude hold mode. This mode
provides
capture
and tracking of the selected altitude. The
selected
altitude is the airplane altitude
at
the
moment
the
ALT button is pressed. If the ALT button is
pressed with
an
established
VS
rate
present,
there will be about a
10% (of
VS
rate) overshoot. The airplane will
return
positively
to
the
selected altitude. For airplane serials 17280831 thru
|
17281118
not
incorporating Honeywell
Service Bulletin
KC140-M1, this button may be used
to
engage the autopilot in
ALT mode.
Figure
2.
Bendix/King 2-Axis KAP 140 Autopilot, Operating
Controls and Indicators (Sheet 2)
Revision
2
S15-9