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If the cowl anti-ice valve fails to open, the L (R) COWL A/ICE caution EICAS message will be
displayed, indicating insufficient pressure.
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−5
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
ENGINE COWL ANTI-ICE SYSTEM (CONT'D)
When the COWL switch/light is deselected, the cowl anti-ice valve is commanded to close.
Should the cowl anti-ice valve remain in the open position (as sensed by the pressure switch),
the L (R) COWL A/ICE caution EICAS message will be displayed, indicating bleed pressure in the
system (valve failed to close).
Pressure Relief Valves
The pressure relief valves provide overpressure protection in the event of cowl anti-ice valve
malfunction. When an overpressure condition occurs, the respective relief valve plunger
extends, dumping excess pressure overboard. When extended, the relief valve plunger is visible
from the ground during external walkaround.
Thrust Reverser Override Function
The cowl anti-ice system is automatically disabled upon thrust reverser operation, since the
14th-stage bleed air cannot simultaneously supply the demands of the thrust reverser and the
cowl anti-ice system. The EICAS caution messages for the cowl anti-ice system are inhibited
during thrust reverser operation.
WINDSHIELD/WINDOW ANTI-ICE SYSTEM
Description
The windshield/window anti-ice system provides a dual-temperature heating function on the
windshield (LOW and HI), and a single-temperature heating function on the side windows (LOW).
When HI is selected, heating of the windshield provides an anti-ice capability on the outer panel,
while also providing a moderate defogging function on the inner surface. The LOW setting
provides defogging to the windshield and window.
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−6
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
WINDSHIELD/WINDOW ANTI-ICE SYSTEM (CONT'D)
Windshield/Window Anti-Ice System
Figure 14−10−4
Components and Operation
Windshield and Window Construction
The forward-facing windshields and side windows are constructed of two vinyl layers, separated
by a vinyl inner layer. Each windshield and window incorporates electrical resistance coatings
that provide heat for anti-icing the windshields, and low heat for defogging the side windows.
Temperature sensors and temperature controllers for each windshield and window regulate
system temperature to maintain a scheduled surface temperature.
Control Switches and Function
The L and R WSHLD/WIND switches, located on the ANTI-ICE panel, control the
windshield/window anti-ice system. The L WSHLD/WIND switch controls the left windshield and
window. The R WSHLD/WIND switch controls the right windshield and window.
When the WSHLD/WIND switch is set to LOW, the corresponding windshield and side window
will be controlled at the low heat level (41°C/106°F).
ICE AND RAIN PROTECTION
Description
Vol. 2 14−10−7
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
WINDSHIELD/WINDOW ANTI-ICE SYSTEM (CONT'D)
When the WSHLD/WIND switch is set to HI, the controllers and sensors operate to maintain a
high heat level (58°C/137°F) on the corresponding windshield, and a low heat level
(41°C/106°F) on the corresponding side window.
Overheat protection circuits for each windshield or window remove power from the affected
surface during an overheat condition. The applicable L (R) WSHLD HEAT, L (R) WINDOW HEAT
caution EICAS message will also be displayed. Moving the WSHLD/WIND switch to the
OFF/RESET position de-energizes the applicable windshield and window, and resets the
temperature controller.
System Test
The TEST switch is used to test the windshield and window anti-ice systems. With both
WSHLD/WIND switches in the HI position, depressing the TEST switch performs a test of the
windshield and window heat systems. A successful test is indicated by the L (R) WSHLD HEAT
OK and L (R) WINDOW HEAT OK advisory EICAS messages appearing.
With the WSHLD/WIND switches in the LOW position, only the side window heat system will be
tested.
AIR DATA PROBES AND SENSORS ANTI-ICING
Description
The air data probes and sensors are located on either side of the aircraft nose, and are electrically
heated to prevent ice formation. Two air data sensor heat controllers (ADSHCs) provide control
and monitoring of the probe heaters.
Two probe toggle switches, located on the ANTI-ICE panel, provide control of AC power to the left
side and right side heating elements. Activation of the heating elements is determined by probe
　
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