WINDSHIELD ANTI-ICING AND DEFOGGING

ATA30
  • The anti-icing and defogging system of the windshield keeps a clear visibility through the windshield and windows in icing or foggy conditions is achieved by electrical heating of the windshield and windows.
  • The system is automatically started at engine start-up. A pushbutton switch also controls operation of the system (pushbutton switch in ON configuration).
  • Final : hoạt động khi ít nhất 1 Eng hoạt động hoặc manual khí ấn vào PROBE/WINDOW HEAT pushbutton switch
  • The system is made up of two independent sub-systems, left and right.
  • Each sub-system includes:
    • one windshield,
    • two windows: one sliding and one fixed (aft),
    • one Window Heat Computer (WHC).
    • In each sub-system, the windshield temperature regulation and the window temperature regulation are independent.
  • Two temperature sensors are installed inside each windshield (one sensor active, the other(s) spare).
  • Two temperature sensors (one is in spare, which can be used permanently if the first one fails) are installed in each of the fixed and sliding side windows.
  • The regulation threshold of the WHC is between 35 and 42 deg.C.
  • Detection of window extreme temperatures or failure of associated temperature sensor causes:
    • activation of a warning in the cockpit,
    • automatic cut off of the heating of the defective window.
  • These extreme temperatures are given below:
    • +60 deg.C (140 deg.F): corresponds to an overheat or to the sensor in open circuit,
    • -60 deg.C (-76 deg.F): corresponds to the sensor in short circuit.
  • The faults of the heating system of each window are shown on the ECAM display unit. The WHC automatically stops heating.The WHC serves to:
    • identify the faulty component(s),
    • store the fault(s) in a memory which is not erased after supply cut-off.
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