HYDROGEN-FUELLED AIRCRAFT POWER SYSTEM

A hydrogen-fuelled aircraft power system (300) incorporates a gas turbine engine (301) and a fuel cell (302), in which air supply and cooling of the fuel cell (302) is integrated with the gas turbine engine (301) to improve overall efficiency of the power system (300). The system may be part of a turbofan, turboprop or electric propulsion system for an aircraft.