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Boeing Starliner launch Saturday ruled out as helium leak analysis continues

May 22, 2024
in Science
Boeing Starliner launch Saturday ruled out as helium leak analysis continues
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The United Launch Alliance Atlas 5 rocket that will carry Starliner, pictured on pad 40 at Cape Canaveral prior to its first launch attempt in early May 2024. Image: Michael Cain/Spaceflight Now.

Plans to launch Boeing’s oft-delayed Starliner spacecraft on its first crewed test flight Saturday were put on hold Tuesday night to give managers more time to evaluate a small helium leak in the ship’s propulsion system. A new launch target was not announced.

The Starliner’s crew — commander Barry “Butch” Wilmore and co-pilot Sunita Williams — remained at the Johnson Space Center in Houston awaiting word on when to head for the Kennedy Space Center to make final preparations for launch to the International Space Station.

They had hoped to blast off at 3:09 p.m. EDT Saturday, assuming NASA and Boeing managers agreed it would be safe to launch the spacecraft “as is,” with a small-but-persistent leak in the ship’s propulsion pressurization system.

But multiple sources said earlier Tuesday that option was no longer on the table as additional meetings were planned to discuss the rationale for launching the spacecraft assuming the leak would not worsen in flight.

In a short statement late Tuesday, NASA said “the team has been in meetings for two consecutive days, assessing flight rationale, system performance and redundancy. There is still forward work in these areas, and the next possible launch opportunity is still being discussed.”

NASA did not announce when the analysis might be complete or when another launch attempt might be made. Near-term launch opportunities beyond Saturday and Sunday, based on the Starliner’s ability to match the station’s orbit, are May 28, June 1 and 2 and June 5 and 6.

The latest delay was a familiar setback for the hard-luck Starliner, which has suffered a steady stream of frustrating setbacks since an initial unpiloted test flight in 2019 was derailed by software problems and communications glitches. A second uncrewed test flight was launched and while it was generally successful, more problems were discovered after its return to Earth.

The helium leak was first detected during a launch attempt on May 6. At the time, engineers concluded the leak rate was small enough to permit launch, but the countdown was called off after engineers with Atlas-builder United Launch Alliance noted unusual behavior in an oxygen pressure relief valve in the rocket’s Centaur upper stage.

Managers eventually decided to haul the rocket back to the company’s Vertical Integration Facility to replace the valve. That work was completed without incident and the new valve was cleared for flight.

Boeing engineers took advantage of delay to carry out a more thorough assessment of the helium leak, which was traced to a specific reaction control system thruster in one of four “doghouse” assemblies mounted around the exterior of the Starliner’s drum-shaped service module.

Each doghouse features four orbital maneuvering and attitude control — OMAC — thrusters and four smaller reaction control system maneuvering jets. Pressurized helium gas is used to push propellants to the rocket motors in each doghouse as well as to four powerful launch abort engines that would only be fired in the event of a catastrophic booster failure.

Engineers tightened bolts around the flange where the leak was detected, pressurized the lines and then ran tests to determine if the leak was still present. In the meantime, launch was re-targeted for May 21 and then, when tests revealed the leak was still present, to Saturday to give engineers more time to assess the data.

The flight is now on hold indefinitely, pending results of the ongoing analysis.

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Copyright for syndicated content belongs to the linked Source : Spaceflight Now – https://spaceflightnow.com/2024/05/22/boeing-starliner-launch-saturday-ruled-out-as-helium-leak-analysis-continues/

Tags: BoeingscienceStarliner
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