Textron Cessna 172S Skyhawk SP, Information Manual

Page: 440 / 491

CESSNA
MODEL
172S
,SECTION 9 -.SUPPLEMENTS
SUPPLEMENT20 - FAAAPPROVED
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1. MARKER' BEACON. ANNUNCIATOR L1GHTS'- 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 biue,
amber, and white lighis on the. taceplate, as well as the audio tones,
identify the beacon type .
.OUTER [a] •. Light illuminates blue to indicate passage of outer marker
beacon.
MIDDLE [MJ -- Light illuminates amber to indicate passage of middle
marker beacon.
INNER, AIRWAY and FAN [I] _. Light illuminates white to indicate
passage of ILS itiner, ,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 lohsar the
outer. marker tone about a mile out. At this point you may select the
"La" (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
TIM
position while receiving a marker beacon signal will cause the audio to
be temporarily silenced. ~o action is required
-to
restore the audio in
time for the
n~xt
beacon.
Figure 1. Bendix/King KMA 28 Audio Selector Panel (Sheet 1 of 5)
Dec 30/00
S20-5