Patent ID: 6347767
Filing Date: 2002-02-19
Classification: B64D

Abstract:
Method for detection of conditions involving a risk of ice formation on the surface of aircraft in movement, based on temperature measurement, characterized in that the surface temperature is measured with temperature measuring elements (Dt1, Dt2, Dt3) disposed in at least two surface points (P1, P2, P3, P4) having different air pressures,that a recording of the temperature difference between the points depending on time (61-64) is taken as a basis for the detection and a corresponding indication being presented to the aircraft pilot or crew, at least one temperature measuring element (Pt100) giving a measure of absolute temperature, that constitutes a check of the validity of the detection and the indication when the absolute temperature is between 0Â° C. and âˆ’55Â° C.; and the recording of the time curve or development comprises the temperature difference in a normal situation for the aircraft concerned and its velocity, altitude, climbing/descending relationships as well as normal, dry air, and that subsequently recorded temperature differences are related to the temperature difference in the normal situation, for detection and indication of risk of ice formation.