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Boeing Starliner launch slips to Could 21 to confirm helium leak repair – Spaceflight Now

May 14, 2024
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Boeing Starliner launch slips to Could 21 to confirm helium leak repair – Spaceflight Now
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Artist’s illustration of Boeing’s Starliner spacecraft in orbit. Credit score: Boeing

Launch of a United Launch Alliance Atlas 5 rocket carrying Boeing’s Starliner capsule is slipping one other 4 days, from Friday to subsequent Tuesday, to present engineers time to ensure a helium leak within the crew ship’s propulsion system has been resolved, officers mentioned Tuesday.

Liftoff from pad 41 on the Cape Canaveral Area Pressure Station is now focused for Could 21 at 4:43 p.m. EDT, establishing a docking on the Worldwide Area Station the next afternoon. The flight is anticipated to conclude with a touchdown at White Sands, New Mexico, round Could 30.

Mission commander Barry “Butch” Wilmore and co-pilot Sunita Williams had hoped to take off on the Starliner’s first piloted flight final Monday. They had been within the means of strapping in when the countdown was referred to as off due to hassle with an oxygen strain aid valve within the rocket’s Centaur higher stage.

Two days later, the Atlas 5 was hauled off the launch pad and moved again to ULA’s close by Vertical Integration Facility the place the suspect valve was changed. Exams confirmed the rocket is nice to go for an additional launch attempt.

The unrelated helium leak within the Starliner’s propellant pressurization system was famous throughout the countdown final week, but it surely remained inside protected limits for flight. After the Atlas 5 and Starliner had been rolled again to the VIF for the oxygen valve alternative, managers determined to take a better take a look at the helium situation.

The leak was detected in plumbing making up a helium manifold inside one in every of 4 “doghouse” assemblies spaced across the exterior of the Starliner’s drum-shaped service module. Every doghouse options 4 orbital maneuvering and perspective management — OMAC — thrusters and 4 small response management system maneuvering jets.

Pressurized helium gasoline is used to push propellants to the rocket motors in every doghouse, in addition to 4 highly effective motors on the base of the spacecraft that might be used throughout an in-flight abort to propel the capsule away from a malfunctioning booster. The leak was traced to a flange on a single RCS thruster.

Bolts had been retorqued and engineers imagine the system is flight prepared. However managers determined to pressurize the helium traces all through the spacecraft so engineers can monitor them over time to ensure the traces are, the truth is, leak free or inside acceptable limits.

“As part of the testing, Boeing will deliver the propulsion system as much as flight pressurization simply because it does previous to launch, after which permit the helium system to vent naturally to validate present knowledge and strengthen flight rationale,” the corporate mentioned in an announcement.

“Mission groups additionally accomplished an intensive overview of the information from the Could 6 launch try and aren’t monitoring every other points.”

Wilmore and Williams, each veteran Navy take a look at pilots and astronauts with 4 flights to the station between them, flew again to the Johnson Area Middle in Houston final Friday for added simulator coaching. They’re anticipated to fly again to Florida late this week to gear up for an additional launch attempt.

The Starliner is one in every of two commercially procured crew ferry ships ordered by NASA within the wake of the shuttle program’s retirement in 2011. SpaceX received a contract valued at $2.6 billion for growth of the corporate’s Crew Dragon spacecraft and Boeing was awarded $4.2 billion to develop the Starliner.

The aim was to spur growth of impartial, commercially-operated spacecraft able to carrying astronauts to and from the Worldwide Area Station. Ordering spacecraft from completely different distributors would permit NASA to proceed sending crews to the area station even when an issue grounded one firm’s ferry ship.

SpaceX launched its first two-man crew in 2020. Since then, the corporate has launched eight NASA-sponsored crew rotation flights to the station, three business analysis missions to the lab and a privately-funded, two-man, two-woman journey to low-Earth orbit. In all, 50 individuals have flown to area aboard Crew Dragons.

Wilmore and Williams would be the first astronauts to fly aboard a Starliner after a collection of technical glitches that included main software program issues throughout an preliminary unpiloted take a look at flight in December 2019 and corroded propulsion system valves that delayed a second uncrewed take a look at mission to Could 2022.

The second take a look at flight, paid for by Boeing, was a hit, however engineers bumped into extra questions on parachute harness connectors and protecting tape wrapped round wiring that posed a fireplace threat in a brief circuit. Work to right these points and others delayed the primary piloted launch to this month.

The Atlas 5 oxygen valve drawback was United Launch Alliance’s accountability. The helium leak accountable for the newest delay goes on the Starliner checklist, but it surely was thought-about a comparatively minor drawback. That mentioned, managers are leaving no stone unturned to make sure flight security.



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