The S1 segment is one of three segments for the Ariane 5 booster and is fully manufactured in Avio’s Colleferro plant (Rome, Italy), except for the metallic component, manufactured by MT Aerospace.
The manufacturing process is:
• application of thermal protection;
• loading with 25 tons of solid propellant;
• inspections of forward and back chicanes – (in a series of inspections and checks to verify its compliance to the project).
The loaded segment is then shipped to French Guiana, where it is assembled to the S2 and S3 segments.