"ICPS RL10 engine fires to boost the spacecraft in a higher orbit around the Earth (from 16 miles to 100 miles). When Orion reaches the highest point of its trajectory, the Interim Cryogenic Propulsion Stage, or ICPS, upper stage will fire its engine to raise its perigee to a safe altitude of 100 miles. Once this burn is complete, Orion and the ICPS will be in a stable low-Earth orbit. A system check at 42 hours after the mission began to ensure the orbit was correct, ranging from (112 miles) 185 km at the closest point to Earth and 1,616 miles (2,600 km) at its highest point." "Dlatego właśnie silnik modułu ICPS wykona kontrolowane odpalenie, podnosząc ten minimalny pułap lotu, a czyli perygeum do bezpiecznej, stabilnej wysokości 180 km."