What is the primary function of helium in the Starliner's thruster system?

Answer

It pressurizes the lines that feed the actual fuel and oxidizer to the thrusters.

Helium is utilized not as a propellant itself, but as a pressurizing agent within the system lines to ensure the proper delivery of the actual fuel and oxidizer to the RCS thrusters.

What is the primary function of helium in the Starliner's thruster system?

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