Cessna 172R, Operating Handbook

Page: 453 / 500

CESSNA
MODEL 172R
SECTION
9 -
SUPPLEMENTS
SUPPLEMENT 15 - FAA APPROVED
NOTE
Altitude preselect
captures
are
not
recommended on
nonprecision approaches
to capture the MDA.
Glideslope coupling will preclude a preselect altitude
capture
on
an ILS.
b. Altitude (ALT) Hold Button:
1) ALT Hold Selector Button
--
PRESS.
Note ALT hold
annunciator ON. Autopilot will maintain the selected
altitude.
NOTE
It is recommended by the FAA (AC00-24B)
to
use basic
"PITCH ATTITUDE HOLD" mode during operation in
severe
turbulence. However, since this autopilot
does
not
use
the attitude gyro as a pitch reference, it is
recommended that the autopilot be disconnected and
that the airplane be
flown by
hand in severe
turbulence.
c.
Changing
altitudes:
1) Using Vertical Speed (Recommended
for altitude
changes less than
1 00 ft.)
a)
VERTICAL SPEED
Control
-
PRESS and HOLD
either the UP or DN button. Vertical
Speed will seek
a
rate
of change of about
500 fpm.
b) VERTICAL
SPEED
Control
-
RELEASE when
desired altitude is reached.
The autopilot will
maintain the desired altitude.
NOTE
As an alternative, a series of quick
momentary
presses
on the UP or DN button will program either an increase
or decrease of the
altitude
reference, 20 feet each time
the button is
pressed.
Original Issue S15-25