Section 7 Pilot’s Operating Handbook
Description of Airplane and Systems EXTRA 500
WARM
COOL
AIR CON
O
F
F
DUMP
ENV AIR
PRESS
MANUAL
13° 30°
HI
TEMP CTRL
AUTO
21°
OFF
LOW
VENT
CABIN
Figure 7-16
Environmental Control Switches, Part of Left Side Panel
7.20.b Temperature control
Environmental bleed air is used for cabin heating purposes. The
bleed air, exiting the engine is too hot to be used for cabin
heating without prior cooling. The amount of cooling required
is dependent on ambient temperature, airspeed, engine power
setting, desired cabin temperature and adequate changes if these
parameters change.
Cooling effectiveness is controlled by routing the environmental
bleed air through the cabin cooler or directly (bypass) to the
cabin by means of the temperature modulating valve. Operating
mode of this valve is selected by the controls grouped in the
CABIN section of the left side panel. With the TEMP CTRL
switch being set to the AUTO position a computerized cabin
temperature controller compares the actual cabin temperature
(measured by a sensor in the cockpit ceiling) to the selected
temperature. Selection is being done by means of the cabin
temperature rheostat also located in the left side panel
CABIN
section (see
Figure 7-16). Adjustment range is between 13 °C
and 30 °C (55 °F to 86 °F). Depending on the difference
between actual cabin temperature and selected cabin
temperature the controller determines a desirable cabin inflow
temperature for the environmental bleed air. The actual inflow
7-58 26. January 2011
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