Equipped Propulsion Bay Layout

All the propellant tanks for the spaceship propulsion are located in the ATV Service Module, between the main engines and the avionics bay: there are eight titanium propellant tanks and 2 high pressure helium tanks. The tanks hold up to seven tonnes of MMH and N2O4 propellants, part of which will be used for the station attitude and orbit control. The propellants are pressurized by helium stored in two high-pressure wound carbon-fibre tanks.