SPEED LIMITING FOR POWER TURBINE GOVERNING AND PROTECTION IN A TURBOSHAFT ENGINE

A control system (240) for limiting a power turbine torque of a gas turbine engine (100; 300) is disclosed. In various embodiments, the control system (240) includes an engine control module (242) configured to output an effector command signal (268) to a gas generator (102; 202) of the gas turbine engine (100; 300); a power turbine governor module (248) configured to output to the engine control module (242) a power turbine torque request signal (QPT_req); and a power turbine torque limiter module (246) configured to output to the power turbine governor module (248) a power turbine speed rate signal (NPdot_max) to limit a power turbine speed overshoot of the gas turbine engine (100; 300).