Cessna 172S Pilot Operating Handbook page 191

CESSNA
MODEL 1 72S
1 1
1 . MARKER BEACON ANNUNCIATOR LIG HTS -- The three-light marker
beacon receiver built into the KMA
when the ship's antenna passes over a 75 MHz beacon.
amber, and white lights on the faceplate, as wel l as the audio tones,
identify the beacon type.
OUTER [0] -- Light illuminates blue to indicate passage of outer marker
beacon.
MIDDLE [M] -- Light illuminates amber to indicate passage of middle
marker beacon.
I NNER, AIRWAY and FAN [I] -- Light illuminates white to indicate
passage of ILS inner, aiivVay or fan marker beacons.
2.
MARKER BEACON SENSITIVITY
The three-position switch is used to set the receiver sensitivity and to
test the annunciator lamps.
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
"LO" (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.
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.
time for the next beacon.
Figure 1 . Bendix/King KMA 28 Audio Selector Panel (Sheet 1 of 5)
Dec 30100
SUPPLE M E NT 20 - FAA APPROVED
2
1 0
9
When this switch is on "HI" (upper)
No action is required to restore the audio in
SECTION 9 SUPPLEM ENTS
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7
8
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28
gives a visual and aural signal
&
TEST/MUTE SELECT SWITCH
The "T/M" (bottom)
5
The blue,
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S20-5