Drain mast heating control relies on which signal?

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Multiple Choice

Drain mast heating control relies on which signal?

Explanation:
Drain mast heating is controlled by the aircraft’s 115 VAC electrical supply. The heater controller is energized by an AC signal from the 115 VAC bus and switches the heater on or off based on temperature input, keeping the drain mast from icing. It isn’t driven by 28 VDC, hydraulic power, or cabin air, which is why the AC signal is the correct source for this control.

Drain mast heating is controlled by the aircraft’s 115 VAC electrical supply. The heater controller is energized by an AC signal from the 115 VAC bus and switches the heater on or off based on temperature input, keeping the drain mast from icing. It isn’t driven by 28 VDC, hydraulic power, or cabin air, which is why the AC signal is the correct source for this control.

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