Cessna 172P Pilot's Operating Handbook And Flight Manual page 343

PILOT'S OPERATING HANDBOOK
SUPPI,EMENT
21
CESSNA
4OO
MAR,KE¡R
BEACON
(TYPE n-40U4)
2
AUDIO
CONTROL PANEL FOR USE W¡TH ONE OR TWO
TRANSMITTERS
1,
MARKER, BEACON ANNUNCIATOR, LIGHTS:
OUTER - Light illuminates blue
to
indicate
passa,go
of outer marker
beacon.
MIDDLE
-
Light
iuumlna,tes ember
to indlca,te
passege
of
mlddle
marker
beacon.
INNER
and
FAN
-
l,ight illuminates
white to indica,te
pessa,ge
of innor
and
fan
marker
boaoon,
2.
SPEAKER/OFF/PHONE
SELECTON, SWITCH:
SPEAKER POSITION -
Turns
set on
a,nd
soloats
speakêr
for
eura,l reoeption.
OFF POSITION
-
Turns
set
off.
PHONE POSITION -
Tu¡ns sot on and selects phono
for
aural reception.
3.
ANNUNCIATOF, I,IGHTS
SWITCH:
NITE
POSITION
-
Places the a,nnunciator
líghts in
a
dim lighting
mode
for
night
flying
operations.
Lightintensityofthe NITE position
is
controlledby
the
RADIO LT
dimming
¡hoostat.
DAY POSITION
-
Pla,ces
the anuunciator
lights in
the
full bright
position for
daylight
flying
operations.
TEST POSITION -
Illuminates
all
marker
beacon
annunciator
lights
(a,nd
oth€r
annunciators) in
the
full
bright poeition
to
verify
operation
of
annuncia-
tor lights.
4.
HIGH/LO/MUTE
SELECTOR SWITCH:
HIGH POSITION
-
Roceiver
sensitivit¡¡
ls positionod
for
oirway
flying.
LO POSITION
-
Receiver
sensitivity is poeitioned for ILS
a,pproaches.
MUTE POSITION
-
The
marker
beacon audio
signalÊ
ero
temporerily
blanked out
(for approximetely
30
seoonds) and then
automotically restored,
over the
speaker
or
headset
in
order to provide voice communica,tions without
interference
of
rnarker
bes,con
signals,
Figure
1.
Cessna 400
Marker
Beacon
Operating Controls and
Indicator Lights Supplied with Two or Less Transmitters
3
4
3
30
May
1980