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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
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.
ICE AND RAIN PROTECTION
For Training Purposes Only
Sept 04
14-9
P I LOT T R A I N I N G GU I D E
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 left side and right side heating elements. Activation of the heating elements is
determined by probe switch positions, engine generator operation, and passenger door
status.
Air Data Probes and Sensors Anti-Icing System
Figure 14-5
Left Static
Port
OFF
ON
OFF
ON
LOW LOW
OFF/
RESET
HI HI
L R L R
WSHLD/WIND PROBES
TEST OFF/
RESET
Left
Pitot-Static
Probe
Right
Pitot-Static
Probe
Standby
Pitot Probe
Total Air
Temp Probe
Left
Angle-of-Attack
Vane
Right
Angle-of-Attack
Vane
Right Static
Port
Auxiliary
Angle-of-Attack
Vane
RIGHT
CONTROLLER
(ADSHC)
P604_14_006
LEFT
CONTROLLER
(ADSHC)
ICE AND RAIN PROTECTION
14-10 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Components and Operation
Primary Pitot-Static Probes
There are two pitot-static masts, one on either side of the nose. The pitot static mast
consists of a head and mounting base. The mast has two heaters, one in the head and
the other in the base.
Standby Pitot Probe
There is one standby pitot probe on the left side of the nose which contains one
integral heating element.
Alternate Static Ports
Two flush alternate static ports are located on each side of the aircraft and each
contains an integral heating element.
Angle-Of-Attack (AOA) Vanes
Two angle-of-attack vanes are located on each side of the aircraft and each contains an
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