This study seeks to determine the effects of freestream deceleration on gas turbine film cooling. This process of cooling gas turbine blades during operation increases the engine efficiency and power output. Knowing the effect of freestream deceleration on the film cooling effectiveness will allow film cooling to be further optimized. Measurements were recorded at three different blowing ratios for a zero acceleration case and a deceleration case with a K value of -0.5E-6. Two additional cases will be analyzed during the study. Next semester will be focused on measuring the airflow characteristics to determine why these effects are occurring.