CESSNA
MODEL
172R
SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTION
CABIN HEATING, VENTILATING AND
DEFROSTING
SYSTEM
The
temperature
and
volume of
airflow
into
the cabin
can
be
regulated by
manipulation
of
the push-pull
CABIN
HT and
CABIN
AIR
controls (Refer
to
Figure
7-8).
Both controls are the double¬
button
locking
type
and
permit
intermediate
settings.
For
cabin ventilation, pull the CABIN AIR knob
out.
To
raise
the
air
temperature,
pull the CABIN
HT
knob
out
approximately
1/4
to
1/2
inch
for
a
small
amount of
cabin
heat. Additional heat is
available
by pulling
the knob
out
farther;
maximum heat is available
with the CABIN HT knob
pulled out
and the CABIN
AIR
knob
pushed full
in.
When no
heat is desired in the
cabin,
the
CABIN HT
knob is
pushed full in.
Front cabin
heat and
ventilating
air is supplied
by
outlet holes
spaced
across a cabin
manifold just
forward
of
the pilot's and
copilot’s feet.
Rear cabin heat and air is supplied
by two
ducts
from
the
manifold,
one
extending down
each side
of
the cabin
to
an
outlet
just
aft of
the rudder
pedals
at
floor
level.
Windshield
defrost
air is
also
supplied
by
two
ducts
leading from
the cabin manifold
to
defroster
outlets
near the lower
edge of
the windshield. Two
knobs
control
sliding
valves
in
either
defroster
outlet
to
permit
regulation of
defroster airflow.
V
Separate adjustable
ventilators
supply
additional
air;
one
near
each upper
corner
of the windshield supplies air
for
the pilot and
copilot,
and
two
ventilators
are available for the
rear
cabin area
to
supply
air
to
the rear
seat passengers.
There
are
additional!
ventilators located
in various
positions
in
the
cockpit.
|
Revision
8
7-39
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