The Monitoring and Safing Unit (red) and Fault Tolerant Computer electronic boxes (yellow) inside the ATV's avionics bay

The ATV's Monitoring and Safing Unit (MSU) (outlined in red) and the three electronic boxes (outlined in yellow) for the Fault Tolerant Computer (FTC) inside Jules Verne ATV avionics bay.

The triple FTC, which is the main computer, plays the role of a pilot that navigates the ATV. The Monitoring and Safing Unit (MSU) can be compared to a pilot responsible for safety, hidden inside the automated spaceship responsible for the mission.