Altitude (Alt) Hold Button; Changing Altitudes - Cessna 172R Operating Handbook

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