Abstract: A fuel control system is provided for a gas turbine engine having a core engine comprising at least one core engine spool in which a compressor and a turbine are interconnected by a shaft. The system includes a first engine sensor which determines a power output of the engine. The system further includes a control unit which is configured to compare the determined power output with a value of a power threshold, and to command a reduction in fuel supplied to the engine when the determined power output exceeds the power threshold value. The system further includes a second engine sensor which measures the rate of change of rotational speed of the core engine spool. The control unit is further configured to adjust the power threshold value as a function of the measured rate of change of speed of the core engine spool.