An aircraft flight control system includes at least two flight control computers at least one of which is utilized at any one time to control aircraft flight, each of the at least two flight control computers having at least two processors, each processor being responsive to an aircraft input signal indicative of at least one of a plurality of aircraft flight parameters and being responsive to control laws to provide a control output command signal indicative of a desired control of an aircraft flight control surface. Also, at least one of the at least two processors for each of the at least two flight control computers comprises an abnormal response monitor that is responsive to at least one aircraft input signal indicative of at least one of a plurality of aircraft flight parameters to determine whether the control output command signal is within an acceptable value.