Cessna 182 1978 - 14-2 A; Defrosting System; Description; Operation

MODEL 182 & T182 SERIES SERVICE MANUAL
14-7. DEFROSTING
SYSTEM. (See figure 14-1.)
wings. Each plenum chamber is equipped with
a
valve which meters the incoming cabin ventilation
14-8. DESCRIPTION.
The defrosting
system is air.
This provides a chamber
for expansion of cabin
comprised
of a duct across
the aft side of
the fire-
air which greatly
reduces inlet
air noise.
Filters
wall. a defroster
outlet and shut-off
valve assembly
at
the air inlets are
primarily noise
reduction filters.
mounted
on the left side
of the cowl deck
immediately
Forward cabin
ventilation
is provided by a
fresh air-
aft of the windshield,
a shut-off
valve control
on the
scoop door mounted
on the right
side of the fuselage,
instrument
panel and flexible
ducting
connecting
the
just forward
of the copilot
seat.
The scoop
door is
system.
operated
by a control
in the instrument
panel
marked
"CABIN
AIR." Fresh air from
the scoop door
is
14-9. OPERATION.
Air from
the duct across the
aft side of the
firewall flows through a flexible duct
where it is distributed into the cabin. As long as
to the defroster outlet. The temperature
and volume the "CABIN HEAT"
of
this air is controlled
by the settings
of the heater
from the scoop
will flow through the
duct into the
14-10. TROUBLE SHOOTING. Since the
defrosting cabin. As the
system,
refer to paragraph 14-5 for trouble shooting
the fresh air from the scoop and be distributed
into
the defrosting
system.
the
cabin. Either
one,
or both
of the controls
may
14-11.
REMOVAL.
INSTALLATION
AND REPAIR.
be set
at any position
from full open
to full closed.
Figure
14-1 may be
used as a guide
during removal,
14-15.
TROUBLE SHOOTING.
Most
of the opera-
installation and repair
of defrosting system com-
ponents. Cut hose to length and install in the origi-
nal routing.
Trim hose winding shorter than the hose
control. Check the airscoop filter elements
in the
to allow clamps
to be fitted. A
defective defroster
wing leading edges
for obstructions.
The elements
outlet
must
be repaired
or
replaced.
may
be
removed
and
cleaned
or
replaced.
Since
air
passing through
the filters is emitted
into the cabin,
14-12.
VENTILATING
SYSTEM.
(See
figure
14-2.)
do
not use
a cleaning
solution
which
would
contam-
inate the air. The filters may be removed to in-
14-13.
DESCRIPTION.
The
ventilating
system
is
crease
air
flow.
However,
their
removal
will
cause
comprised
of
two airscoops
mounted
in the
inboard
a slight
increase
in noise
level.
leading
edge
of each wing.
a manually-adjustable
ventilator
installed
on each
side
of the cabin
near
the
14-16.
REMOVAL,
INSTALLATION
AND
REPAIR.
upper
corners
of the windshield,
two plenum
cham-
Figure 14-2
may
be used as
a guide
during removal,
bers
mounted
in the rear
cabin wing
root areas,
a
installation
and repair
of the ventilating
system coM-
fresh airscoop
door
on the
right side
of the fuselage
ponents.
A defective
ventilator
or scoop
must be re-
just forward
of the
copilot's
seat, a
control knob
on
paired
or replaced.
Check
for
proper operation
of
the
instrument
panel
and flexible
ducting
connecting
ventilating
controls
after
installation
or
repair.
the system.
14-14.
OPERATION. Air
received from scoops
mounted
in the inboard
leading
edges
of the wing
is
ducted
to adjustable ventilators
mounted on each side
of
the cabin
near the upper
corners
of the windshield.
Rear seat ventilation
is provided
by plenum chambers
mounted
in the left and right
rear cabin wing root
areas. These plenum
chambers receive
ram air from
the airscoops
in the
inboard leading
edges
of the
14-2A/(14-2B blank)