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NOTE
e
If warm air is not felt coming out of the
registers within one minute, turn cabin heat
switch OFF, check circuit breaker and try
another start.
If heater still does not
start, no further starting attempt should be
made.
•
During heater operation, defrost and/or
cabin air knobs must be open.
HEATER USED FOR VENTILATION,,-
(1)
Battery Switch - ON.
(2)
Cabin Air Knob - Open as desired.
(3)
Cabin Fan Switch - FAN.
(4)
Heat Registers - As Desired.
VENTILATING SYSTEM
In addition to the ventilation provided by the cabin
heating system, a separate ventilation system obtains ram air
from the wing root leading edge air inlets and ducts it to
the directional vents.
The ventilating system functions only
in flight, since it depends entirely on ram air pressure.
For ground ventilation, the ventilating fan of the heating
system must be used.
STATIC PRESSURE ALTERNATE SOURCE VALVE
A static pressure alternate source valve, installed in
the static system, directly below the parking brake handle,
supplies an alternate static source should the external
source malfunction.
This valve also permits draining con-
densate from the static.lines.
When open, this valve vents
to the static pressure in the cabin.
Since this
pressu~e
is
relatively low, the airspeed indicator and the altimeter will
show slightly higher readings than normal.
Therefore, the
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