The AVUM stage consists of two different sections – one that hosts the propulsion system (APM: AVUM Propulsion Module), and the other which is devoted to the platform that houses the avionics (AAM: Avum Avionics Module). The APM provides attitude and thrust control functions for
the Vega Launcher during the final stages of flight, in accordance with mission requirements.
The current standard configuration includes a liquid bi-propellant system for primary maneuvers which uses nitrogen tetroxide (NTO) as the oxidant and unsymmetrical dimethylhydrazine (UDMH) as the fuel – both propelled by pressurized helium gas – and a cold gaseous nitrogen system (GN2) for attitude control.
Total propellant load ranges from 476.2 to 572.2 Kg, depending on mission.
The AMM avionics module hosts the main components of the avionic subsystem of the launch vehicle.