Textron Cessna 172R - Page 453

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
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