Textron Cessna 172R - Page 469

CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
19
-
FAA
APPROVED
6.
NAV/GPS
SWITCH
-
Toggles
from
Nav
1
to
GPS
and vice
versa
to
control the
type
of
navigation
data
to
be
displayed
on
the
CDI
(Course
Deviation
Indicator).
The No.
1
CDI
Omni
Bearing
Selector
(OBS)
provides
analog
course
input
to
the
KLN
94
in
OBS
mode when
the
NAV/GPS
switch/annunciator
is
in
GPS.
When
the
NAV/GPS
switch annunciation is
in
NAV,
GPS
course
selection
in
OBS
mode
is
digital
through
the
use
of
the controls and
display
at
the
KLN
94.
NOTE
Manual
CDI
course
centering
in
OBS
mode
using
the
control
knob
can
be
difficult,
especially
at
long
distances.
Centering
the
Course
Deviation Indicator
(CDI)
needle
can
best be
accomplished
by pressing
the
Direct-To
button and then
manually setting
the No.
1
CDI
course
to
the
course
value
prescribed
in
the
KLN
94
displayed
message.
NOTE
The Directional
Indicator
heading
(HDG)
bug
must
also
be
set
to
provide
proper
course
datum
to
the
autopilot
if
coupled
to
the
KLN
94
in
LEG
or
OBS.
(When
the
optional
HSI
is
installed,
the
HSI
course
pointer
provides
course
datum
to
the
autopilot.)
7.
NAVIGATION
SOURCE
(NAV)
ANNUNCIATOR
~
The
NAV
annunciator
will
illuminate
steady
to
inform
the
pilot
that
NAV
1
information
is
being displayed
on
the
NAV
1
CDI.
8.
NAVIGATION
SOURCE
(GPS)
ANNUNCIATOR
-
The
GPS
annunciator
will
illuminate
steady
to
inform
the
pilot
that
GPS
information
is
being displayed
on
the
NAV
1
CDI.
Figure
1.
GPS
Annunciator/Switch
(Serials
17280852
thru
17280983)
(Sheet
3
of
3)
Jan
22/01
S19-9
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