1-44
Heating
80.
Heated air is supplied by ram air being ducted through a shroud on the exhaust muffler
to a manifold mounted on the firewall above the rudder pedals. Outlet holes in the manifold and
two ducts located just forward of the door posts supply heated air to the cabin. Airflow to the
manifold is controlled by a push-pull knob labelled CABIN HEAT, located on the right hand
instrument subpanel. To select cabin heat, depress the button on the knob and pull the control
out to the desired position.
Figure 1-52 Heat and Air Controls
81.
Windshield defrost air is ducted from the cabin heat manifold to an outlet on the pilot’s
side of the glare shield, and is controlled by a rotary knob labelled DEFROST on the right hand
subpanel.
NOTE
The CABIN HEAT must be ON to get warm defrost air.
Ventilation
82.
Ventilating (cool) air is supplied through the heating manifold by pulling out the CABIN
AIR knob on the right subpanel. Additional (limited) ram air ventilation is available through two
ventilators located in the wing roots on the upper left and right corners of the windshield.
NOTE
The temperature of heated air entering the cockpit may be
moderated by selecting CABIN AIR in conjunction with CABIN
HEAT.
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