Vertical path control augmentation using lateral control surfaces

A method for reducing vertical position errors of an aircraft is disclosed. The method comprises the steps of comparing an actual position of the aircraft to a commanded position of the aircraft determining altitude error and altitude rate error values; passing the altitude error and altitude rate error values through criteria and following no more steps of the method if the altitude error and altitude rate error values are not outside the criteria; multiplying the altitude error and altitude rate error values by at least one gain signal to produce two delta lift commands; summing the two delta lift commands to produce a single delta lift command; and using the single delta lift command in unison with a conventional vertical position feedback elevator control loop to maintain the commanded position of the aircraft.