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WINDSHIELD ANTI-ICE switches have two
positions:
• ANTI-ICE (up) applies power to both the
defog and anti-ice zones.
• OFF removes power from the system.
CAS Messages
W/S O’HEAT Message
If the controller detects an overheat condition,
power is removed from the overheated zone and
a white W/S O’HEAT message appears in the
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510OM-00 10-9
ANTI-ICE ZONE
TRANSITION REGION
DEFOG ZONE
DEFOG ZONE
UNPROTECTED
REGION
ANTI-ICE ZONES
Figure 10-5. Windshield Anti-Ice/Defog Zones
CAS window until the temperature falls to the
acceptable range. If the overheat condition continues
for more than 5 seconds, the message
becomes amber.
W/S A/I FAIL Message
When an L or R WINDSHIELD switch is in
the ANTI-ICE position and DC power is lost
for that windshield, a white W/S A/I FAIL L
(or R) message appears. If the power failure
continues for more than 5 seconds, the message
becomes amber.
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10-10 510OM-00
LH CONTROLLER
LEGEND
RH CONTROLLER
LH CONTROLLER RH CONTROLLER
1
1
1
2 2 3 3
23 231
DEFOG
DEFOG
MID
A/I
DEFOG
MID
A/I
DEFOG
INNER
A/I
DEFOG
INNER
A/I
DEFOG
UNPROTECTED
AREA
UNPROTECTED
AREA
RTD (TEMP
SENSOR)
UNPROTECTED
AREA
100 AMP 200
AMP
200
AMP
100 AMP
LH FEED BUS CROSSFEED BUS RH FEED BUS
W/S A/I FAIL L-R
W/S O'HEAT
W/S A/I FAIL L-R
W/S O'HEAT
Figure 10-6. Windshield Anti-Ice Power Distribution
Figure 10-7. Windshield Anti-Ice Switches
OPERATION
When WINDSHIELD ANTI-ICE is selected,
the windshield controllers provide a slow increase
in temperature to avoid thermal shock
to the windshield panels.
Each windshield controller monitors the windshield
temperature sensors in the zones it controls.
Using this information, it provides
discrete outputs to the CAS for annunciation
of controller failures or windshield overheats.
SENSOR ANTI-ICE
SYSTEMS
DESCRIPTION AND
COMPONENTS
Electric heat is provided to anti-ice the following
sensors:
• Pitot probes
• Static ports
• Stall warning vane
• T2 probes
The heating element for each sensor is monitored
by a current sensor to detect failures.
Failure of any heating element is indicated on
the CAS display.
CONTROLS AND INDICATIONS
Sensor Anti-Ice Switch
The pitot probes, static ports, and stall warning
vane heaters are all controlled by a single
switch on the ICE PROTECTION panel immediately
left of the landing gear handle (see
Figure 10-2). This switch has three positions:
• RESET STALL WARN—A momentarycontact
position. Resets the stall warning
to the normal stall airspeed. (Use
RESET STALL WARN only when wings
are verified free of ice).
• PITOT STATIC—Applies power to the
sensors (both pitot probes, all four static
ports, and the stall warning vane).
• OFF—Removes all power from those
sensors.
ENGINE ANTI-ICE Switches
The T2 probes are electrically heated when their
respective ENGINE ANTI-ICE switches are in
the L or R position and the engine is running.
CAS Messages
The following amber CAS messages indicate
failure of the heating circuits for the corresponding
sensors:
• P/S HTR L-R—Pitot-static systems
• STALL WARN HTR—Stall-warning vane
• T2 HTR FAIL L-R—T2 probes
OPERATION
The pitot probe, static port, and stall warning
vane heaters are powered by selection of
the PITOT STATIC position on the sensor
anti-ice switch.
In flight, the sensor anti-ice switch should be
in the PITOT STATIC position, which heats the
external sensors.
On ground, except in icing conditions or when
ready for takeoff, the switch should normally
be OFF to prevent overheating of the sensors
and their heating elements.
During preflight, the switch may be set to
PITOT STATIC for 30 seconds to verify the
sensors are heating properly.
Limit ground operation of pitot-static
heat to 2 minutes to preclude damage
to the pitot-static and stall warning
heaters.
CAUTION
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510OM-00 10-11
Stall-Warning System Mode
When surface deice is enabled at any time (the
WING/STAB switch is selected to MANUAL
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