NASA clears path for Sunita Williams’ return from space

In a crucial milestone for the return of astronauts Sunita Williams and Butch Willmore to Earth, NASA and Boeing successfully conducted a hot fire test of the Starliner spacecraft. The astronauts were aboard the docked spacecraft during the test, which was a critical milestone in their preparations for the return flight from the International Space Station (ISS).

The test fired 27 of the spacecraft’s 28 jets in short bursts to assess thruster performance and helium leak rates. Initial results show that all tested thrusters operated at preflight levels in terms of thrust and chamber pressure, confirming the spacecraft’s readiness for the return journey.

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During the test, engineers opened all helium manifolds to assess the supply and check for leaks

After the test, the manifolds were closed and will remain sealed until Starliner activates its propulsion system for undocking. The helium system remained stable, and a previously malfunctioning. RCS oxidizer isolation valve was cycled multiple times and is now functioning normally.

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NASA and Boeing teams are currently reviewing data from the docked hot fire test and recent ground testing of a Starliner thruster at NASA’s. White Sands Test Facility in New Mexico. This review will inform the agency’s return readiness review, after which a target return date will be set.

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While ground teams finalize preparations for Starliner’s return. Wilmore and Williams continue their work aboard the ISS with the Expedition 71 crew. On July 29, they checked the spacecraft’s water systems, communicated with Boeing mission personnel, and performed a pressure test in their space suits.

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The Starliner mission, originally planned for a short duration, was extended due to thruster malfunctions and helium leaks. Despite these challenges, the spacecraft safely docked at the ISS, and engineers have diligently addressed the issues. The recent successful hot fire test marks a major milestone in ensuring. The spacecraft’s readiness for a safe return to Earth.

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The primary focus remains on bringing Wilmore and Williams home safely. The results of the recent tests will be crucial in determining the exact timing of their return, with potential undocking dates available throughout August.