Textron Cessna 172R - Page 445

CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
15
-
FAA
APPROVED
3.
Flashing
GS
--
Indication
of
a
flagged
glideslope.
(GS
will
rearm
automatically
if
a
valid
GS
signal
is
received.)
NOTE
To continue
tracking
the
localizer,
observe
the
appropriate
minimums
for
a
nonprecision
approach.
(Press
ALT
twice
in
rapid
succession
to
terminate the
flashing.
Control
the
pitch
axis
in
the
default
VS
mode.)
NOTE
At the
onset
of
mode
annunciator
flashing,
the
autopilot
has
already
reverted
to
a
default
mode
of
operation,
i.e.,
ROL
and
or
VS
mode.
An
immediate
attempt
to
reengage
to
lost
mode
may
be
made
if
the
offending
navigation, glideslope
or
compass
flag
has cleared.
EXCEPTION
The
HDG
annunciation
will
flash for
5
seconds
upon
selection
of
NAV, APR,
or
REV
modes
to
remind
the
pilot
to set
the
HDG
bug
for
use
as course
datum.
Effects of
instrument losses
upon
autopilot operation:
1
.
Loss
of
the
artificial
horizon
--
no
effect
on
the
autopilot.
2.
Loss
of
the
turn
coordinator
--
autopilot inoperative.
3.
Loss
of
the
Directional
Gyro (DG)--
The
directional
gyro
does
not
provide
any
system
valid
flag.
If
the
DG fails
to
function
properly
the
autopilot
heading
and
navigation
mode
will
not
function
correctly.
Under
these
conditions,
the
only
usable
lateral mode is
ROL.
4.
Loss
of
Horizontal
Situation
Indicator
(HSI) (if installed)
--
If
the
HSI
fails
to
function
properly
the
autopilot
heading
and
navigation
mode
will
not
function
correctly.
Under these
conditions,
the
only
usable lateral mode is
ROL.
5.
Loss
of
Blind
Altitude
Encoder
--
Altitude Alerter and Altitude
Preselect
function
inoperative.
Original
Issue
S15-19
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