Abstract :
THE requirement of totalizing two or more liquid levels in aircraft fuel tanks falls into two broad classifications. The first involves the addition of levels where the sequence of use is definitely established. This type is best exemplified by considering a long wing tank where the dihedral angle makes it necessary to have more than one transmitter in the tank to obtain complete coverage of the fuel contents. Figure 1 shows such an arrangement. With the fuel outlet as shown, transmitter 2 must function first. In other words, the sequence of operation is fixed so that the operation of transmitter 2 is always followed by that of transmitter 1 as fuel is withdrawn from the tank.
