SYSTEM AND METHOD FOR DETECTING A SHAFT EVENT ON A GAS TURBINE ENGINE

Methods and systems for detecting a shaft event of a gas turbine engine (10) are described. The method comprises monitoring at least one engine parameter and comparing the at least one engine parameter to a schedule for the at least one parameter defining a first threshold (302) and a second threshold (304) greater than the first threshold (302); applying a limit to the at least one engine parameter when the at least one engine parameter is inside a parameter limiting region between the first threshold (302) and the second threshold (304), the first threshold (302) separating the parameter limiting region from a normal operating region, the second threshold (304) separating the parameter limiting region from a hazardous operating region; and detecting the shaft event when the at least one engine parameter crosses the second threshold (304) and issuing a signal in response to the detecting.