Patent ID: 8401719

Claim:
A computerized method for reducing a net amount of fuel consumed during a flight when running a jet engine on an airplane, wherein the jet engine includes a housing having an inlet end and an outlet end, and a compressor located between the inlet end and the outlet end, and wherein the airplane includes an engine-control computer for controlling the engine, the method comprising: measuring a first pressure near the inlet end of the jet engine; measuring a second pressure near the outlet end of the jet engine; and controlling a speed of the compressor with the engine-control computer to maintain a value of the second pressure divided by the first pressure at a controlled first value in a range of 0.9 to 1.15 at a plurality of descent altitudes from cruising altitude to approximately 9,000-11,000 feet at which the jet engine, if set to idle, would have a value of the second pressure divided by the first pressure of less than the first value in order to reduce the jet engine acting as a speed brake for the airplane during a descent of the airplane, in order to reduce the net amount of fuel consumed during the flight.