This paper investigates the accuracy of Uniform Crystal Temperature Sensors (UCTS) under transient conditions and describes a methodology for addressing sources of systematic error based on the findings. The study applies to the important task of thermal mapping of critical turbine parts during the engine development phase, for which UCTS is particularly well suited. A previous study focused on UCTS in steady state regimes and provided recommendations for optimizing the technique. However, a substantial reduction in engine development costs may be achieved by being able to combine, for instance cyclic endurance tests with thermal mapping assuming that neither task will jeopardize the other.