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Windshield Heating System
The windshield is electrically heated. Two windshield heater control units in the forward e-bay independently regulate and monitor the left and right windshields. There are 3 elements on each windshield, 2 connected to the windshield heater control unit (1 is a control sensor, the other an overheat sensor), and 1 spare.
On the ground with 1 AC power source available (eg. the APU only), the windshield heating is inhibited. Inflight with 1 AC power source available, only the left windshield is heated, unless it is failed in which case the right windshield is heated.