Patent ID: RE41381

Claim:
A system for determining a safe flight level in an aircraft having a pressurized oxygen supply, comprising: a pressure transducing system sending a data signal indicative of the pressure in the oxygen supply; means for providing a data signal indicative of the amount of fuel in the aircraft; compute computer data storage for maintaining aircraft engine performance data and equal time point (ETP) data between two predetermined diversion airports; a computer processor receiving said pressure and fuel data and calculating (i) fuel usage versus time as a function of the engine performance data, (ii) oxygen usage versus time as a function of altitude, and (iii) ETP versus time as a function of altitude; and a screen for graphically displaying at least one of (i), (ii), and (iii) superimposed , and optionally superimposing at least two of (i), (ii), and (iii) when said at least two are graphically displayed .