Cessna 1980 172RG Cutlass Pilot Operating Handbook page 144

PILOT'S OPERATING HANDBOOK CESSNA 400 MARKER BEACON
SUPPLEMENT
CESSNA 400 MARKER BEACON
The system consists of a remote mounted 75 MHz marker beacon
receiver, an antenna which is either flush mounted or externally mounted
on the under side of the aircraft and operating controls and annunciator
lights which are mounted on the front of the audio control panel.
Operating controls for the marker beacon system are supplied on the
front of the two types of audio control panels used in this Cessna aircraft.
The operating controls for the marker beacon are different on the two audio
control panels. One type of audio control panel is supplied with one or two
transmitters and the other is supplied with three transmitters.
The marker beacon operating controls and annunciator lights used on
the audio control panel supplied with two or less transmitters are shown
and described in Figure 1. The operating controls consist of three, three-
position toggle switches. One switch is labeled "HIGH/LO/MUTE" and
provides the pilot with HIGH-LO sensitivity selection and marker beacon
audio muting, for approximately 30 seconds, to enable voice communica-
tion to be heard without interference of marker beacon signals. The marker
beacon audible tone is automatically restored at the end of the 30 second
muting period to continue marker audio for passage over the next marker.
Another switch is labeled "SPKR/ OFF/ PHN" and is used to turn the set on
and select the desired speaker or phone position for marker beacon
signals. The third toggle switch labeled, "ANN LT", is provided to enable
the pilot to select the desired DAY or NITE lighting position for annuncia-
tor lights, and also a "TEST" position to verify operation of marker beacon
annunciator lights.
The marker beacon operating controls and annunciator lights used on
the audio control panel supplied with three transmitters are shown and
described in Figure 2. The operating controls consist of two, three-position
toggle switches, and two concentric control knobs. One switch is labeled
"SPKR/PHN" and is used to select the desired speaker or phone position
for marker beacon signals. The other switch is labeled "HI / LO / TEST" and
1 July 1979
SUPPLEMENT
(Type R-402A)
SECTION .
GENERAL
.8
(TYPE R-402A)
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