Pilot’s Operating Handbook Section 7
EXTRA 500 Description of Airplane and Systems
7.25 Stall Warning System
The aircraft is equipped with a heated vane type stall warning
switch (lift detector) located on the middle of the left wing
leading edge activating the stall warning horn and the red stall
warning light in the cockpit before angle of attack reaches a
critical value. The system operates at all wing flap positions and
will warn the pilot at 5-10 knots above the respective stall
speeds.
7.25.a Lift Detector Heat
The lift detector heat is controlled by
PITOT-R switch located
on the
DEICE section of left side panel. Circuit protection is
integrated in the
PITOT-R circuit breaker on the LOAD BUS
section of the pilot’s left side circuit breaker panel. The lift
detector heat (vane, base plate, and case heat) is deactivated by
the landing gear squat switch to avoid overheating on the
ground. If the
PITOT-R switch is placed in the ON position
while the aircraft is sitting on the ground the STALL HEAT light
will illuminate on the annunciator panel indicating that heating
is not active (compare to 7.23.a). The lift detector can be ground
checked prior to flight by holding the
PITOT-R switch in the
TEST position for no longer than 10 seconds. While the
PITOT-R switch is in the TEST position the STALL HEAT
annunciation will not illuminate if the system is operational,
indicating the system is working.
Important Do not operate the stall warn heat longer than ten 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.
26. January 2011 7-67
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