Textron Cessna 172R - Page 484

SECTION
9
-
SUPPLEMENTS
SUPPLEMENT
20
-
FAA
APPROVED
CESSNA
MODEL
172R
NOTE
In
this
stereo
installation,
all headset locations
are
wired
in
parallel.
If
a
monaural headset
is
plugged
in
at
any
location,
one
intercom
channel
will
be shorted.
Although
no
damage
to
the
intercom
will
result,
all
stereo
headset
users
will
lose
one
audio channel. The monaural headset
will
perform
normally.
A
crystal-controlled
superheterodyne
marker beacon
receiver
with
3-light
presentation
is
incorporated
within
the unit.
Dimming
circuitry
for
the marker beacon
lamps
automatically
adjusts
brightness
appropriate
to
the
cockpit
ambient
light
level.
HI
and
LO
sensitivity
and
lamp
test/receiver
audio
mute
(T/M)
functions
are
also
provided.
Light dimming
for
the
audio
control
panel
is
manually
controlled
by
the
RADIO
light
rheostat knob.
MARKER
FACILITIES
MARKER
IDENTIFYING TONE
LIGHT
Inner,
Airway
&
Fan
Continuous
6
dots/sec
(3000 Hz)
White
Middle
Alternate dots and dashes
(1300 Hz)
Amber
Outer
2
dashes/sec
(400 Hz)
Blue
*When
the
identifying
tone
is
keyed,
the
respective
indicating
light
will
blink
accordingly.
S20-4
Dec
30/00
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