In very general terms, here’s what has to happen to get ATV-3 undocked:
- ‘Wake up’: ATV avionics & on board flight control systems will be powered up
- Demerging: Uncoupling of power & data connections
- ISS transitions to ‘Free Drift’ mode – to avoid any movements/rotations that might interfere with ATV undocking
- ATV Hooks opening – starting to release the vessel’s grasp on the ISS
- ATV Undocking starts – push back of Europe’s cargo vessel by pressure springs.
- ATV Departure manoeuvre – thruster burn to pull Edoardo Amaldi back & away from Station