Section 7 Pilot’s Operating Handbook
Description of Airplane and Systems EXTRA 500
Important Do not operate the heating elements longer than 10 seconds
when on ground or at outside air temperatures above 20°C
when airborne. The elements can overheat and damage to
the structure can occur.
Note The yellow PITOT HEAT LEFT or PITOT HEAT RIGHT
annunciations are always illuminated when the airplane is
airborne, unless the
PITOT switch is ON and the systems
operating.
7.24 Pneumatic System
Engine bleed air is used as a power source for the pneumatic
system of the aircraft. The air is pressure regulated to a constant
19 psig by the pressure regulator and condensed water is
removed by the downstream water separator.
A pressure switch monitors pneumatic pressure. When
pneumatic pressure drops below 15 psig it activates the yellow
PNEUMATIC LOW annunciation light.
The pneumatic system provides air pressure for the pneumatic
de-ice boots operation and evacuation. Normally a minimal
amount of air is bled though the two ejector valves to provide
suction for boots evacuation. When the pneumatic deicer boots
are activated by the
BOOTS switch, a timer controls the ejector
valves periodically to inflate each of the two boot-circuits for 6
seconds. Thereafter they are evacuated again for 48 seconds.
7-66 26. January 2011
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