Electrical circuitry for monitoring the current flow through resistance elements on the leading edge of an aircraft wing or horizontal stabilizer. The resistance elements are individually and sequentially activated for heating to thereby effect a de-icing or anti-icing function. The non-activated elements...http://www.google.de/patents/US4514619?utm_source=gb-gplus-sharePatent US4514619 - Indirect current monitoring via voltage and impedance monitoring
