Cessna 182 1973 - Static Dischargers

If
erroneous
instrument
readings
are
suspected
due
to
water
or
ice
in the
static
system ports or
lines,
the
static
pressure
alternate
source
valve
knob
should be
pulled
on,
venting
the
static
system
to
the.
cabin,
However,
cabin
pressures
will
vary
with
open
cabin
ventilators
or
win-
dows.
The
most
adverse
combinations will
result
in
airspeed
and
alti-
meter variations
of
no
more
than
6
MPH
and
50
feet
respectively.
In climb and
cruising
flight,
the
airspeed
and
altimeter
will
read
high.
However,
in
the
landing
approach
(when
instrument
readings are
more
important)
the
instruments
will
generally
read
low.
Therefore,
using
the
normal
published
approach speeds
and
altitudes
will
result
in
a
slightly
faster
approach
speed
and
higher
approach path
than
normal,
giving
an
extra
margin
of
safety.
STATIC
DISCHARGERS
If
frequent
IFR
flights
are
planned,
installation
of
optional
wick-type
static
dischargers
is
recommended
to
improve
radio
communications
during
flight
through
dust
or
various
forms
of
precipitation
(rain,
freez-
ing
rain,
snow
or
ice
crystals).
Under
these
conditions,
the
build-up
and
discharge
of
static
electricity
from the
trailing
edges
of
the
wings,
rud-
der,
elevators,
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).
Installation
of
static
dischargers
reduces
interference from
precip-
itation
static,
but
it
is
possible
to
encounter
severe precipitation
static
conditions which
might
cause
the
loss
of
radio
signals,
even
with
static
dischargers
installed.
Whenever
possible,
avoid
known
severe
precip-
itation
areas
to
prevent
loss
of
dependable
radio
signals.
If
avoidance
is
impractical,
minimize
airspeed
and
anticipate
temporary
loss
of
radio
signals
while in
these
areas.
7-3