An aircraft propulsion system 2 has a gas turbine engine 10 supplied with fuel contained in a fuel tank 53, a flight profile adjuster (fig.6,212), and a fuel composition determination module 210. A method of operating the aircraft involves proposing or initiating a change to the aircrafts flight profile based on a determined fuel characteristic. The change to the flight profile may change the intended altitude or route. The fuel characteristic may be one or more of: percentage of sustainable aviation fuel, percentage of nitrogen-containing species, and/or presence of tracer species or trace element in the fuel; aromatic or multi-aromatic hydrocarbon content, hydrogen to carbon ratio, hydrocarbon distribution, thermal stability and/or level of coking of the fuel; naphthalene, sulphur, cycloparaffin and/or oxygen content of the fuel; level of non-volatile particulate matter emissions on combustion; an indication that the fuel is a fossil fuel, density, viscosity, calorific value and or heat capacity. Preferably, a fuel characteristic of any fuel already present in the fuel tank prior to refuelling, and of a fuel added to the tank on refuelling is determined, and a fuel characteristic of the resultant fuel mix in the tank after refuelling calculated.


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    Title :

    Flight profile


    Contributors:

    Publication date :

    2023-07-19


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS / B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT



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