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There is a worldwide trend for the evaluation of internal thermal comfort in aircraft cabins. Even nowadays one of the major difficulties found is the development and application of a standardized index of internal thermal comfort evaluation in the complex environment of a passenger cabin. The objective of this paper is the CFD model description to evaluate the thermal environment in an aircraft passenger cabin and its results. For this, a digital thermal manikin was developed. Experimental and numerical global heat transfer coefficients were compared. Precision of less than 10% was achieved. In this evaluation five turbulent models were tested. Latter, two numerically calibrated manikins were put into a typical cabin. As a comfort index it was used the equivalent temperature for eighteen body segments. A study of the manikin equivalent temperatures with the aircraft on the ground, in cruise and with low ventilation conditions is presented.