The Icing Technology Branch at NASA-Lewis has been involved in an effort to validate two thermal ice protection codes developed at the NASA-Lewis Research Center: LEWICE/Thermal (electrothermal de-icing & anti-icing), and ANTICE (hot-gas & electrothermal anti-icing). The Thermal Code Validation effort was designated as a priority during a 1994 “peer review” of the NASA-Lewis Icing program, and was implemented as a cooperative effort with industry. During April 1996, the first of a series of experimental validation tests was conducted in the NASA-Lewis Icing Research Tunnel (IRT). The purpose of the April 96 test was to acquire experimental data to validate the electrothermal predictive capabilities of both LEWICE/Thermal, and ANTICE. A heavily instrumented test article was designed and fabricated to simulate electrothermal de-icing and anti-icing modes of operation. Thermal measurements were then obtained over a range of test conditions, for comparison with analytical predictions. This paper presents an overview of the test, including a detailed description of (1) test article design, (2) test matrix development, (3) test procedures, and (4) validation process. Selected experimental results are presented for de-icing and anti-icing modes of operation. Finally, the status of the validation effort at this point is summarized. NOMENCLATURE AOA Angle-Of-Attack (degrees) Beta Collection Efficiency IRT Icing Research Tunnel LWC Liquid Water Content (g/m) MVD Median Volumetric Diameter (μm) ON/OFF Heater On / Off Time (seconds) Q Heater Flux (Watts/in) POI Point Of Interest RTD Resistance Temperature Device S Wrap Distance (inches) Tevap Evaporative Anti-Icing Temp. (°F) Twet Running Wet Anti-Icing Temp. (°F) Ttot Total Temperature (°F) TTMS Test Thermal Management System V Airspeed (mph)