Cessna 172P - CESSNA 400 MARKER BEACON (Type R-402 A)

PILOT'S
OPER,ATING
HANDBOOK
SUPPLEMENT
21
CESSNA
4OO
MAR,KER,
BEACON
(TYPE n-4024)
SUPPLEMENT
CESSNA
4OO MARKER
BEACON
(Type
R-4o24)
sEciloN
I
GENERAL
The
system
consists of a rgmote
mounted 7ó IllÁIIz 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 coäirols
for tho marker beaoon
are different
on
the two
audio
control
panels.
One
type
of
audio control
panel
is
supplied
with
one
ortwo
transmitters and
the other is supptied with
three
transmitters'
The marker beacon operating
controls
and
annunciator
Iights
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 tabeled "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
onable
the
pitot
to select the desired
DAY or
NITE lighting
position
for annuncia-
tor lights, and
al.so
a
"TEST"
positÍon
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
contrgl
knobs. One
switch is
labeled
"SPKF,/PHN"
and is used to select the
desired
speaker or
phone
position
for marker
beacon signals.
The other switch
is labeled
"Hl/LO/TEST" and
30 May 1980
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