Below 230 KIAS, which surfaces are heated by the anti-ice system?

• A. Wings and Cowls
• B. Cowls only
• C. Wings only
• D. Pylons only

Answer: (A)

Ice on the leading edges of the wings and the engine cowls is a major risk because it alters the airfoil shape, increases drag, and can cause early stall. The anti-ice system uses hot bleed-air to heat those leading-edge surfaces, keeping them clear of ice as you fly through moist, cold air. The pylons aren’t heated by this system in this configuration, since they aren’t critical lift surfaces and aren’t the focus of the standard anti-ice protection. So, at subsonic speeds below 230 KIAS, the surfaces that receive anti-ice heating are the wings and the cowls.