*Advanced Applications of Hydrogen and Engineering Systems in the Automotive Industry*

**Figure 1.** *Symmetrical structures of classical and hybrid electrohydraulic servos.*

*Structure of a hybrid servomechanism designed for actuating the ailerons of A380: (a) Basic hydraulic diagram; (b) Main view of assembly.*

b. The replacement of any kind of servo valves by a bidirectional reversible volumetric pump driven with a brushless motor controlled by power electronics (Airbus, from 2005). This evolution is presented in **Figure 1** for symmetric actuators [1, 2]. **Figure 2** shows the hydraulic diagram, and the main view of A380 ailerons servos [1, 2].
