A method of operation is provided during which fuel is delivered to a powerplant using a fuel system. The powerplant and the fuel system are arranged onboard an aircraft. The fuel system includes a first fuel reservoir and a second fuel reservoir. The first fuel reservoir contains a quantity of the fuel. At least some of the quantity of the fuel contained in the first fuel reservoir is transferred into the second fuel reservoir when a fault is identified associated with the first fuel reservoir.

A fuel level control system and method for an aircraft to passively manage fuel center of gravity during consumption includes an upper tank, a lower tank disposed below the upper tank, a fuel transfer line connecting the tanks, an upper fuel transfer line outlet in the lower tank and a lower fuel transfer line outlet in the lower tank. The outlet outlets are in fluid communication with the upper tank via the fuel transfer line. An upper line outlet valve is associated with the upper fuel transfer line outlet for opening and closing the upper fuel transfer line outlet. A lower line outlet valve is associated with the lower fuel transfer line outlet for opening and closing the lower fuel transfer line outlet. A control shutoff valve is disposed on the fuel transfer line for selectively limiting flow through the fuel transfer line.

A fuel level control system and method for an aircraft to passively manage fuel center of gravity during consumption includes an upper tank, a lower tank disposed below the upper tank, a fuel transfer line connecting the tanks, an upper fuel transfer line outlet in the lower tank and a lower fuel transfer line outlet in the lower tank. The outlet outlets are in fluid communication with the upper tank via the fuel transfer line. An upper line outlet valve is associated with the upper fuel transfer line outlet for opening and closing the upper fuel transfer line outlet. A lower line outlet valve is associated with the lower fuel transfer line outlet for opening and closing the lower fuel transfer line outlet. A control shutoff valve is disposed on the fuel transfer line for selectively limiting flow through the fuel transfer line.

A hydrogen-powered aircraft with a fuselage with an unpressurised aft portion containing or configured to contain at least one hydrogen tank. A roof portion of the fuselage at least partially covers the unpressurised aft portion and integrates an antenna for satellite internet access from within the aircraft. The antenna may be counter sunk and/or covered by a skin.

A hydrogen-powered aircraft with a fuselage with an unpressurised aft portion containing or configured to contain at least one hydrogen tank. A roof portion of the fuselage at least partially covers the unpressurised aft portion and integrates an antenna for satellite internet access from within the aircraft. The antenna may be counter sunk and/or covered by a skin.

A vacuum-insulated pipe assembly including an outer pipe and an inner pipe within the outer pipe, the inner and outer pipes concentric along a common central axis, the outer pipe spaced from the inner pipe to define a space, the space evacuated to define a vacuum. The outer pipe includes first and second outer pipe sections, the first outer pipe section includes a first outer connector, and the second outer pipe section includes a second outer connector, the first outer connector removably connected to the second outer connector at an outer connection interface. The inner pipe includes first and second inner pipe sections, the first inner pipe section includes a first inner connector, and the second inner pipe section includes a second inner connector, the first inner connector removably connected to the second inner connector at an inner connection interface.

A vacuum-insulated pipe assembly including an outer pipe and an inner pipe within the outer pipe, the inner and outer pipes concentric along a common central axis, the outer pipe spaced from the inner pipe to define a space, the space evacuated to define a vacuum. The outer pipe includes first and second outer pipe sections, the first outer pipe section includes a first outer connector, and the second outer pipe section includes a second outer connector, the first outer connector removably connected to the second outer connector at an outer connection interface. The inner pipe includes first and second inner pipe sections, the first inner pipe section includes a first inner connector, and the second inner pipe section includes a second inner connector, the first inner connector removably connected to the second inner connector at an inner connection interface.

A cover for covering an access port of a fuel storage structure of an aircraft, the access port is configured to allow a human operator to access an interior of a first container of the fuel storage structure. The cover comprises an inlet port configured to interface with and receive fuel from an aircraft refueling apparatus, and an outlet port fluidically connectable to the inlet port and operable to provide the fuel received at the inlet port to the interior of the first container when the cover is arranged to cover the access port.

A cover for covering an access port of a fuel storage structure of an aircraft, the access port is configured to allow a human operator to access an interior of a first container of the fuel storage structure. The cover comprises an inlet port configured to interface with and receive fuel from an aircraft refueling apparatus, and an outlet port fluidically connectable to the inlet port and operable to provide the fuel received at the inlet port to the interior of the first container when the cover is arranged to cover the access port.