US Patent 7843355 Fluid-gauging systems

An aircraft fuel-gauging system has multiple gauging sensors in each tank divided into two groups. Each group of sensors connects with a respective processor. The processors are linked to provide a display in the cockpit to give an indication of fuel quantity derived from all the sensors. The two processors also provide separate, nominally-identical display indications of fuel quantity on a refuel panel on the exterior of the aircraft. The refueller can compare these two separate quantity indications with the flow meter in the fuel dispenser to confirm that the correct quantity has been dispensed.