the atmosphere, particularly at night, can produce vertigo and loss of
orientation.
CABIN HEATING AND VENTILATING SYSTEM.
The temperature and volume of airflow into the cabin can be regulated
to any degree desired by manipulation of the push-pull "CABIN HEAT" and
"CABIN AIR" knobs.
Heated fresh air and outside air are blended in a cabin manifold just
aft of the firewall by adjustment of the heat and air controls; this air is
then vented into the cabin from an outlet on the left side of the manifold.
Windshield defrost air is also supplied by a duct leading from the manifold.
A separate adjustable ventilator near each upper corner of the wind-
shield supplies additional outside air to the pilot and passenger.
PARKING BRAKE SYSTEM.
To set parking brake, pull out on the parking brake knob, apply and
release toe pressure to the pedals, and then release the parking brake
knob. To release the parking brake, apply and release toe pressure on
the pedals while checking to see that the parking brake knob is full in.
STARTING ENGINE.
Ordinarily the engine starts easily with one or two strokes of primer
in warm temperatures to six strokes in cold weather, with the throttle
open approximately 1/4 inch. In extremely cold temperatures, it may
be necessary to continue priming while cranking.
Weak intermittent explosions followed by puffs of black smoke from
the exhaust stack indicate overpriming or flooding. Excess fuel can be
cleared from the combustion chambers by the following procedure: Set
the mixture control in full lean position, throttle full open, and crank
the engine through several revolutions with the starter. Repeat the
starting procedure without any additional priming.
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