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BEECHCRAFT Sundowner
180
Section VII
C23 (M-1285
and
After)
Systems Description
switch, facilitates
ventilation
for
ground
operation.
The
switch
is located
on
the
pedestal
(M-1875,
M-1880
thru
M-1979,
except
M-1971),
or
on
the
left
instrument
subpanel
(M-1971,
M-1980
and
after). The
fan should
be
off
when the
airplane
is airborne.
EXHAUST VENT
A
fixed exhaust vent
is located
in
the
aft cabin
for flow-
through
ventilation.
PITOT
AND
STATIC SYSTEMS
PITOT SYSTEM
The pitot
system
provides
a
source
of impact
air for opera-
tion of the
airspeed
indicator.
The pitot mast is located
on
the
leading
edge of the
left wing.
PITOT HEAT
The pitot
mast
is provided
with
an
electric
heating
ele-
ment
which
is
turned on and
off
with a switch on the
instrument
panel. The
switch should
be ON when
flying in
visible
moisture,
It is not advisable
to
operate
the
pitot
heating
element on the
ground
except for testing
or
for
short
intervals
of
time to
remove
ice or
snow.
NORMAL
STATIC
AIR SYSTEM
The normal
static air system
provides
a
source
of
static
air
to the flight
instruments
through a flush static fitting
on
each side
of
the aft fuselage.
A
union
located
inside
a
cover plate on
the belly
of
the
airplane
provides
a
drain
point
to remove
moisture
from the system.
January,
1982
7-31
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