ApplicationNo. 05/611270 filed on 09/08/1975
US Classes:244/134D, Electric219/202, Vehicle or vehicle component219/209, Electrical devices219/483, Controlling or regulating plural separate distinct heating resistance elements(i.e., one control system for all elements)219/486, Selectively, sequentially or alternately219/494Thermally responsive
ExaminersPrimary: Blix, Trygve M.
Assistant: Kelmachter, Barry L.
Attorney, Agent or Firm
Foreign Application Priority Data1974-09-10 DT
AbstractIn a method for de-icing aircraft surfaces by means of a plurality of electrical resistance heaters which are sequentially supplied with heating current, the delivery of current to each heater being effectuated during a succession of cycles each constituted by a heating period during which heating current is supplied to the heater and a nonheating period during which no current is supplied to the heater, thereby controlling the average current supplied to the heater, the range of ice accumulation rates to which the de-icing process can adjust is enlarged by controlling the duration of the heating periods in dependence on the temperature at the resistance heaters and by controlling the duration of the nonheating periods in dependence on the water content of the atmosphere surrounding the aircraft.