Cessna 152 - Page 137

CESSNA
MODEL
152
SECTION7
AIRPLANE
&
SYSTEMS
DESCRIPTIONS
SPEAKER SIDETONE VOLUME CONTROL
A
speaker
sidetone
volume
control
is
a
feature
of
audio
control
panels
used
on
airplanes
not
equipped
with
marker
beacon
receivers.
The
control
is
used
to
adjust
the
level
of
sidetone
volume
heard
on
the
airplane
speaker
only.
Sidetone
volume
heard
on
a
headset
is
not
externally
adjustable.
Rotate
the
knob,
labeled
SIDETONE
VOL,
clockwise
to
increase
speaker
sidetone
volume
and
counterclockwise
to
decrease
it.
Be
aware
that
if
the
sidetone
level
is
set
too
high,
it
can
cause
audio
feedback
(squeal)
when
transmitting.
MICROPHONE-HEADSET
INSTALLATIONS
Three
types
of
microphone-headset
installations
are
offered.
The
standard
system
provided
with
avionics
equipment
includes
a
hand-held
microphone
and
separate
headset.
The
keying
switch
for
this
microphone
is
on
the
microphone.
Two
optional
microphone-headset
installations
are
also
available;
these
feature
a
single-unit
microphone-headset
combina-
tion
which
permits
the
pilot
to
conduct
radio
communications
without
interrupting
other
control
operations
to
handle
a
hand-held
microphone.
One
microphone-headset
combination
is
offered
without
a
padded
headset
and
the
other
version
has
a
padded
headset.
The
microphone-headset
combinations
utilize
a
remote
keying
switch
located
on
the
left
grip
of
the
pilot's
control
wheel.
The
microphone
and
headset
jacks
are
located
on
the
pedestal
below
the
instrument
panel.
Audio
to
all
three
headsets
is
controlled
by
the
individual
audio
selector
switches
and
adjusted
for
volume
level
by
using
the
selected
receiver
volume
controls.
NOTE
When
transmitting,
the
pilot
should
key
the
microphone,
place
the
microphone
as
close
as
possible
to
the
lips
and
speak
directly
into
it.
STATIC
DISCHARGERS
If
frequent
IFR
flights
are
planned,
installation
of
wick-type
static
dischargers
is
recommended
to
improve
radio
communications
during
flight
through
dust
or
various
forms
of
precipitation
(rain,
snow
or
ice
crystals).
Under
these
conditions,
the
build-up
and
discharge
of
static
electricity
from
the
trailing
edges
of
the
wings,
rudder,
elevator,
propeller
tips,
and
radio
antennas
can
result
in
loss
of
usable
radio
signals
on
all
communications
and
navigation
radio
equipment.
Usually
the
ADF
is
first
to
be
affected
and
VHF
communication
equipment
is
the
last
to
be
affected.
1
July
1978
7-35