CESSNA
MODEL 172S
SECTION 9 ~ SUPPLEMENTS
SUPPLEMENT
3 - FAA APPROVED
3
MARKER BEACON SENSITIVITY
LAMP AND TEST SWITCH
--The "MKR" Audio. Select button must be pushed so that the
green
annunciator
is illuminated
for the
marker
beacon
to
receive to provide an audio signal at beacon passage.
When
this
switch
is
on
"HI
SENS"
(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
the "LO SENS"
(middle)
position
to temporarily
silence
the
tone.
It will start to sound again when you are closer to the
marker, giving you a more precise indication of its location.
4. AUDIO SELECT BUTTONS
--
Push button audio selection
is
available
for
three
Communications
receivers
("COM
1",
"COM 2", and "COM 3"), two Navigation
receivers
("NAV 1"
and "NAV 2"), the internal Marker
Beacon
receiver ("MKR"),
one
DME,
one ADF,
and one
additional
auxiliary
receiver
("AUX"). The "AUX" position could be used, for example,
for
a second DME or ADF.
When a receiver's audio is selected,
the green annunciator
illuminates at the bottom of the button.
Push the button again to deselect the receiver's audio.
5. MICROPHONE
SELECTOR
SWITCH
(MIC) -- Used to select
the desired
transmitter
for the
cockpit
microphones.
The
"C1 ",
"C2", and "C3" positions
are for transmitting
on the
Com
1, Com
2, and Coin
3 communications
transceivers,
respectively.
The
'.'EMG" (emergency)
position
is used to
bypass
the KMA 26's audio amplifier
and directly
connects
Com
1 to the
pilot's
microphone
and
headphones.
This
provides a fail-safe
method of communication
should the unit
fail.
The "PA" position
may be selected when the aircraft is
configured
with a passenger
address
capability.
The "Auto
Com"
feature
always
provides
automatic
headphone
audio
selection
to
match
the
Com
transmitter
in use.
To
add
speaker audio, simply push the Speaker Select Switch (inner
right knob) to the "in" position.
Pulling the switch to the "out"
position removes speaker audio.
Figure 1. Bendix/King KMA 26 Audio Selector Panel (Sheet 2 of 4)
July 8/98
S3-5
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