In flight with visible moisture and a total air temperature range of 10°C to -39°C, which surfaces are heated when airspeed is at or above 230 KIAS?

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Multiple Choice

In flight with visible moisture and a total air temperature range of 10°C to -39°C, which surfaces are heated when airspeed is at or above 230 KIAS?

Explanation:
Ice can form on surfaces exposed to visible moisture when temperatures are near or below freezing, so aircraft use anti-ice heating to keep those surfaces warm enough to prevent ice buildup. In this scenario, the engine nacelle cowls are heated by the anti-ice system using hot bleed air. At or above 230 KIAS, that heat is directed to the cowls to protect the nacelle surfaces and especially the intake area from ice, which could affect engine performance. The wing leading edges and pylons aren’t heated in this specific condition, so the cowls are the surfaces receiving heat.

Ice can form on surfaces exposed to visible moisture when temperatures are near or below freezing, so aircraft use anti-ice heating to keep those surfaces warm enough to prevent ice buildup. In this scenario, the engine nacelle cowls are heated by the anti-ice system using hot bleed air. At or above 230 KIAS, that heat is directed to the cowls to protect the nacelle surfaces and especially the intake area from ice, which could affect engine performance. The wing leading edges and pylons aren’t heated in this specific condition, so the cowls are the surfaces receiving heat.

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