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Ariane 6 early combined tests at Latesys in Fos-sur-Mer, in France, in March 2021 simulated the moment of liftoff when the umbilicals separate from the launch vehicle to test the interfaces and mechanical behaviour during separation of upper and lower stage umbilicals.
At liftoff, umbilicals that separate from the lower liquid propulsion stage are pulled back into two mini masts on the launch pad. Steel doors slam shut to shield this cryogenic connector system from the rocket exhaust as ascent begins. This all happens in split seconds in a highly precise, synchronised sequence.