Abstract: Method and apparatus for de-icing the leading edges of airfoil sections of aircraft embodies a closed circuit conduit having a heat conductive section extending along the leading edge of each airfoil section. The rear side of each heat conductive section is secured to and insulated from its leading edge while the leading side of each heat conductive section defines an exposed, heat emitting surface. A heated liquid is circulated through the closed circuit conduit at a temperature and flow rate to cause heat to be emitted from the heat emitting surface to dislodge ice accumulated thereon as the liquid is cooled.