Cessna 172P - 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