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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
Summary of Contents for 172R
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