AIRCRAFT ENGINE CONTROL SYSTEM FOR MAINTAINING CONSTANT THRUST BELOW SEA LEVEL

A method of controlling an aircraft engine includes determining a reference thrust that corresponds to a thrust setting parameter at a selected aircraft operating parameter for a current airspeed according to a predefined relationship. An adjustment factor is determined based on a relationship between the current aircraft operating parameter and the selected aircraft operating parameter. A prescribed thrust at the current aircraft operating parameter is determined by applying the adjustment factor to the reference thrust. A value of a thrust setting parameter that provides the prescribed thrust at the current aircraft operating parameter is used to operate the aircraft engine at the prescribed thrust.