Textron Cessna 172R - Page 485

CESSNA
MODEL
172R
SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
20
-
FAA
APPROVED
1.
MARKER
BEACON ANNUNCIATOR
LIGHTS
-
The
three-light
marker
beacon
receiver built into the
KMA
28
gives
a
visual and aural
signal
when
the
ship's
antenna
passes
over a
75
MHz
beacon.
The
blue,
amber,
and
white
lights
on
the
faceplate,
as
well
as
the
audio
tones,
identify
the beacon
type.
OUTER
[O]
-
Light
illuminates blue
to
indicate
passage
of
outer
marker
beacon.
MIDDLE
[M]
-
Light
illuminates amber
to
indicate
passage
of
middle
marker
beacon.
INNER,
AIRWAY
and
FAN
[I]
-
Light
illuminates white
to
indicate
passage
of
ILS
inner,
airway
or
fan
marker beacons.
2.
MARKER
BEACON
SENSITIVITY
&
TEST/MUTE
SELECT SWITCH
-
The
three-position
switch
is
used
to
set
the receiver
sensitivity
and
to
test
the
annunciator
lamps.
When this switch
is
on
"HI"
(upper)
position,
the
high
sensitivity
is
selected
which
permits
you
to
hear
the
outer
marker
tone
about
a
mile
out.
At
this
point
you may
select the
°L0‘
(middle)
position
to
give
you
a
more
accurate
location
of
the
Marker.
When
used
only
for
approach
markers,
many
pilots
choose
to
leave
the switch
in
the
LO
sensitivity
position.
The
"T/M"
(bottom)
position
is
a
momentary
switch that
will
illuminate all three
lamps
simultaneously
to
assure
they
are
in
working
order. This switch also
has
a
Marker
Beacon
"mute"
function.
Pushing
the
switch
to
the
T/M
position
while
receiving
a
marker
beacon
signal
will
cause
the
audio
to
be
temporarily
silenced.
No
action
is
required
to
restore
the
audio
in
time
for
the
next
beacon.
Figure
1
.
Bendix/King
KMA
28
Audio
Selector
Panel
(Sheet
1
of
5)
Dec
30/00
S20-5
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