Cessna 172R, Operating Handbook

Page: 259 / 500

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