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level suitable for anti-icing of the engine intake cowl and T2 probe. The valves are
fail-safed to the open position. Therefore, if electrical power is lost and bleed air is
available, the cowl anti-ice valves will move to the open position.
Selecting a COWL switch/light to ON commands the corresponding cowl anti-ice
valve to open. When the valve opens, the COWL switch/light will illuminate (as
sensed by the pressure switch) and the COWL A/ICE ON advisory EICAS message
will appear.
If the cowl anti-ice valve fails to open, the L (R) COWL A/ICE caution EICAS
message will be displayed, indicating insufficient pressure.
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 the 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 antiice
system are inhibited during thrust reverser operation.
ICE AND RAIN PROTECTION
For Training Purposes Only
May 03
14-7
P I LOT T R A I N I N G GU I D E
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.
In addition to electrically heating the windshields/windows, a footwarmer/demist
system is available, using an electric element and fan, to demist the inside of the
windshields. This system uses recirculated airflow and is discussed in Chapter 2 Air
Conditioning and Pressurization.
Windshield/Window Anti-Ice System
Figure 14-4
LOW LOW
OFF/
RESET
HI HI
L R
WSHLD/WIND
TEST OFF/
RESET
LEFT
WINDSHIELD
LEFT SIDE
WINDOW
RIGHT
WINDSHIELD
RIGHT SIDE
WINDOW
LEFT
CONTROLLER
P604_14_005
RIGHT
CONTROLLER
ICE AND RAIN PROTECTION
14-8 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
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).
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
　
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