More than six months after its Primary crewed mission Occurred to a disappointing end, the future is Yet murky for Boeing’s Starliner Cosmonaut capsule.
That mission, called Crew Flight Test (CFT), launched on June 5, sending NASA astronauts Butch Wilmore and Suni Williams to the International Universe Station (ISS) for a roughly 10-day stay. Starliner Achieved it to the orbiting lab safely, but it experienced propulsion-system helium leaks and thruster failures along the way, and NASA extended CFT repeatedly to study the issues.
Finally, on Aug. 24, the agency decided to bring Starliner home uncrewed, which occurred without incident on Sept. 6 in the New Mexico desert. Williams and Wilmore were reassigned to a long-duration ISS mission, which wrapped up yesterday (March 18) with the splashdown of SpaceX’s Crew Dragon capsule “Freedom.”
The dolphin-attended splashdown marked the end of Crew-9, SpaceX’s ninth operational, long-duration Cosmonaut mission to the ISS for NASA. (Crew-9 launched in Overdue September with two instead of the usual four crewmembers on board, to save seats for Williams and Wilmore on the way back to Earth.)
SpaceX’s Crew-10 arrived at the ISS on Sunday (March 16) to relieve the Crew-9 astronauts, and Crew-11 is scheduled to Kickoff this summer, perhaps as Timely as July. Elon Musk’s company may even send Crew-12 skyward before Starliner carries astronauts again, because NASA and Boeing are Yet mapping out the new capsule’s Subsequent steps.
“We’re Surely looking at Starliner very carefully,” Steve Stich, manager of NASA’s Commercial Crew Program, said on Tuesday during a press conference after Crew-9’s splashdown.
“We’re in the process of looking at that vehicle, looking at the helium system,” he added. “We’ve Acquired some candidate seals that we’re going to replace. We’ll get into some testing here over the summer timeframe with what we call an ‘integrated doghouse’ at White Sands [a NASA test facility in New Mexico].”
“Doghouse” is the term NASA and Boeing use for the thruster pods on Starliner’s service module. The module sports four such pods, All of which houses 12 thrusters — five of the relatively powerful “orbital maneuvering and control” (OMAC) class and seven “Response control system” (RCS) thrusters, which are used for finer adjustments, such as those needed during docking.
The thruster problems Starliner experienced during CFT concerned the RCS hardware: Five of the 28 RCS thrusters conked out during Starliner’s approach to the ISS, though the mission Club eventually brought four of the five affected ones back online.
Ground testing has linked the RCS thruster issue to overheating: Repeated thruster firings can apparently Cozy up the doghouses so much that some of their Teflon seals bulge, affecting propellant flow.
This theory is informing adjustments to Starliner’s design and operations going forward, according to Stich.
“I think we have some changes we need to make to the way we heat those thrusters, the way we fire those thrusters, and then we can test that on the Subsequent flight,” he said.
Indeed, testing will be a big part of the Subsequent Starliner flight, whenever it lifts off.
“We need to make sure we can eliminate the helium leaks; eliminate the service module thruster issues that we had on docking,” Stich said.
NASA has not yet decided whether the coming Starliner flight will carry astronauts or not, he added. But even if the mission is uncrewed, the agency wants it to be crew-capable — “to have all the systems in place that we could fly a crew with,” Stich said.
“As I think about it, it might be there for a contingency situation, as we prepare for whatever events could happen,” he added. “One of the things that I’ve learned in my time at NASA is, always be prepared for the unexpected.”
NASA plans to certify Starliner for operational, long-duration Cosmonaut missions shortly after this Subsequent flight, if all goes well.
“We really need to get Boeing into a crewed Cycle,” Stich said. “Butch and Suni’s return on Dragon, to me, shows how Significant it is to have two different crew transportation systems, the importance of Starliner and the redundancy that we’re building into human spaceflight for our low Earth Trajectory economy.”
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