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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 14.10.7
Oct 05/06
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 14.10.8
Oct 05/06
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.
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