Patent ID: 9567093
Date: 2017-02-14
CPC Classifications: B64D,G01F

Claim:
1. An aircraft fuel tank system comprising an aircraft fuel tank; and a time domain reflectometry (TDR) fuel gauge installed in the aircraft fuel tank for measuring a filling level of fuel in the aircraft fuel tank, the TDR fuel gauge comprising an electromagnetic signal generator and a cable, the cable comprising a first cable part a second cable part and a third cable part which are coupled in series to the signal generator, wherein: the first cable part extends downwardly within the fuel tank and the second cable part extends upwardly within the fuel tank; the first and second cable parts are arranged such that for at least one filling level of the fuel in the fuel tank the first cable part extends down into the fuel from an ullage space at a first location and the second cable part extends up out of the fuel into an ullage space at a second location which is spaced apart from the first location; and the fuel tank has two opposite side walls and an upper or lower wall extending between the side walls, and each of the first, second and third cable parts of the cable runs substantially along the length of a respective one of the two opposite side walls and the upper or lower wall.