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Section
VII
BEECHCRAFT Sundowner
180
Systems Description
C23 (M-1285
and
After)
ENVIRONMENTAL
SYSTEMS
CABIN
HEATING
Air
for warming the
cabin
and
defrosting
the windshield
enters through an
intake
on
the forward engine baffle,
passes
through the
heater
and into
a
mixer
box
where
it is
blended
with
cold air to
obtain
the
desired
cabin tempera-
ture. Hot
or cold
air may enter the
cabin
through the
firewall outlets. The knob marked
CABIN AIR regulates
the
quantity
of
air entering
the
cabin
through this firewall
outlet.
With
the
CABIN AIR
knob
in, pull out
the
CABIN
HEAT knob for
heated
air and
push
it in for fresh
air.
There
are 4 outlets
for
cabin
heat
distribution.
Pull out the
DEFROST knob for
maximum
defrost.
Under extremely
cold conditions,
heating
in
the back seats can be
improved
by
partially
pulling
the
defrost
knob.
VENTILATION
M-1285
thru M-IS79 except M-1875:
Fresh
air
for the
cabin
enters two
grill
type
intakes
im-
mediately
forward of the
windshield.
The air is
ducted
to
four
outlets,
one
on either side
of the
instrument
panel
and
to two overhead
outlets
for rear
seat passengers.
The flow
of air
is controlled
by the rotation of these
outlets.
M-1875,
M-1880 and after:
Fresh
air for the cabin enters through two grill type
in-
takes immediately forward of the
windshield
and through a
scoop type
intake
on the dorsal fin. The
grill
type
intakes
supply fresh air to the
outlets
on
each
side
of the
instru-
ment panel.
The
scoop
type
intake
supplies fresh air to the
four
overhead
outlets.
Air
flow through the
outlets
is
regu-
lated
by rotating the
outlet. An
optional fan,
controlled
by a
7-30
January,
1982
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