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Raumfahrt - Boeing Starliner docks with ISS -Update

21.05.2022

Boeing Starliner docks with ISS marking NASAs first simultaneous use of two crew vehicles

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The uncrewed Boeing Starliner capsule successfully docked with the International Space Station for the first time Friday evening, a long-awaited milestone for a capsule that had fallen far behind its SpaceX Crew Dragon counterpart.

The docking occurred nearly 26 hours after Starliner's liftoff aboard an Atlas V rocket from Launch Complex 41 at Cape Canaveral Space Force Station.

Boeing and NASA teams on the ground in Houston worked in conjunction with NASA astronauts aboard the ISS to send commands to the capsule and eventually guide it in for docking at 8:28 p.m. 

For the first time, both astronaut capsules of NASA's Commercial Crew Program -- Boeing's Starliner and SpaceX's Crew Dragon -- are simultaneously docked with the space station.

The Orbital Flight Test 2 mission is an uncrewed demonstration flight that has been delayed for years as a part of NASA's Commercial Crew Program, the $8 billion venture to develop the Starliner and Crew Dragon.

NASA invested in two companies to develop astronaut capsules to ensure a system of redundancy for crew transportation in an effort to move away from solely relying on Russia to transport its astronauts on Soyuz capsules at $90 million a seat. 

SpaceX's Crew Dragon has been in constant operation transporting a total of 18 astronauts to and from the ISS since its first crewed demonstration flight in May 2020. The Starliner, in contrast, experienced a series of setbacks including an aborted mission in 2019, adding years of delays and costing the company over half a billion dollars to rectify. 

Friday's rendezvous and docking process took about five hours to complete once the capsule caught up with the space station after chasing it for nearly 21 hours.

Upon Starliner's docking, NASA astronaut Bob Hines offered words of congratulations to the joint Boeing and NASA teams, "The crew of Expedition 67 would like to offer our congratulations on this momentous occasion. Today marks a great milestone, providing additional commercial access to low Earth orbit, sustaining the ISS, and enabling NASA's goal of returning humans to the moon and eventually to Mars." 

A screen capture of the Boeing Starliner capsule docked for the first time to the International Space Station during NASA's Commercial Crew Program OFT-2 mission.
A screen capture of the Boeing Starliner capsule docked for the first time to the International Space Station during NASA's Commercial Crew Program OFT-2 mission.  
NASA

Shortly after Satarliner separated from its ULA Atlas V booster on Thursday, two of the 12 thrusters on the backside of the capsule failed to work perfectly. A third thruster was able to pick up the slack and perform correctly for the remainder of the maneuver. 

A cooling system on board the capsule also performed slightly out of expectation on the way to the ISS. The issues with the capsule, however, did not impact its capability to proceed with the mission. 

Furthermore, an issue with the NASA docking system on Starliner caused an additional thirty-minute delay Friday. Starliner controllers on the ground in Houston had to retract the docking mechanism to reset it before a docking attempt with the space station. 

Starliner will remain attached to the space station for the next five days before returning for a parachute-assisted landing in New Mexico at the Army's White Sands Missile Range.

On Saturday, NASA astronauts Kjell Lindgren and Bob Hines of NASA's SpaceX Crew-4 mission who assisted Boeing and NASA teams with the Starliner's approach and docking will open the hatches between the space station and the capsule to unload about 800 pounds of cargo. 

Even with the successful docking under its belt, Boeing still has many issues to work out with Starliner before astronauts will fly on it. 

The final hurdle that Starliner needs to clear before NASA certifies it as a human-rated spacecraft will come as the Crewed Flight Test. That mission is set to occur sometime before mid-2023 and will carry two or three NASA astronauts to the space station and back. 

Once the OFT-2 Starliner lands in New Mexico sometime next week it will be transported back to Boeing's factory at Kennedy Space Center in Florida. 

The company will spend the next several months processing the capsule and developing long-term solutions to the issues that were encountered during the OFT-2 mission to prepare for the highly-anticipated first crewed mission.    Quelle: Florida Today                                                                                                                                    +++                                                                                                                                                                  

Starliner docks with ISS for the first time                        oft2-docking-879x485           Boeing's CST-100 Starliner approaching the International Space Station shortly before its docking. Credit: NASA TV

Updated 10:45 p.m. Eastern with post-launch briefing comments.

TITUSVILLE, Fla. — Boeing’s CST-100 Starliner spacecraft successfully docked with the International Space Station May 20, a little more than 24 hours after its launch.

The spacecraft docked with the forward docking port on the Harmony module of the station at 8:28 p.m. Eastern. Controllers reported a hard docking securing the spacecraft to the station about 20 minutes later, although hatches separating the spacecraft from the station won’t open until around 11:45 a.m. Eastern May 21.

The docking took place more than an hour later than the original schedule as controllers worked through several minor issues. That included the spacecraft’s docking ring, which needed to be retracted and extended again before the spacecraft could make its final approach.

“To the joint Boeing and NASA team, the crew of Expedition 67 would like to offer our congratulations on this momentous occasion,” NASA astronaut Bob Hines, currently on the station, said after the docking was confirmed. “Today marks a great milestone towards providing additional commercial access to low Earth orbit, sustaining the ISS and enabling NASA’s goal of returning humans to the moon and eventually to Mars.”

“This was a really critical demonstration mission,” Kathy Lueders, NASA associate administrator for space operations, said in a briefing an hour after docking. “Seeing that vehicle docked now to the ISS is just phenomenal.”

Neither NASA nor Boeing provided updates about the status of the Orbital Flight Test (OFT) 2 mission for more than 17 hours after a postlaunch briefing May 19, an unusual silence that raised concerns that there was a problem with the spacecraft. A Boeing spokesperson told SpaceNews that the company would provide an update about the mission “in a bit” but the company did not release that update until more than three hours later.

In that update, Boeing confirmed that the spacecraft was generally in good condition, having conducted several tests as planned. One issue was “off-nominal behavior” of a thermal cooling loop on the spacecraft, but the company said the system was still maintaining stable temperatures.

“The ground team did a great job of managing those loops,” said Steve Stich, NASA commercial crew program manager, at the post-docking briefing. He said some moisture may have gotten into the coolant loops that froze out and clogged a filter, causing a pressure rise in the loop. Controllers were able to manage the temperature of those coolant loops, and there was plenty of margin in the system.

The other issue was the failure of 2 of 12 aft-facing Orbital Maneuvering and Attitude Control (OMAC) thrusters during the spacecraft’s orbit insertion burn shortly after launch. In the statement, Boeing said a drop in chamber pressure likely caused the thrusters to shut down.

Mark Nappi, Boeing vice president and commercial crew program manager, said engineers developed a fault three and identified “three or so” plausible causes, which he did not identify, later suggesting the two thrusters may have failed for different reasons. “We may never know what the real cause of what this is because we don’t get this vehicle back,” he said. The thrusters are located in the service module, which is jettisoned before reentry and burns up in the atmosphere.

Other OMAC thrusters continued to work well, performing several maneuvers as the spacecraft approached the station before smaller reaction control system (RSC) thrusters took over for the final approach. The OMAC thrusters will not be used again until the spacecraft’s deorbit burn at the end of the mission.

In addition to the two OMAC thruster failures, two RCS thrusters also shut down during the approach to the station after suffering a drop in chamber pressure. “I don’t think we know quite yet what happened to those thrusters, but the vehicle has plenty of redundancy,” Stich said, including for undocking and landing.

Starliner is expected to remain at the station until at least May 25. Stich said the earliest undocking opportunity would set up a landing at White Sands Space Harbor in New Mexico at 6:46 p.m. Eastern that day, weather permitting. “We’re not in any hurry to come back. We want to learn as much from this vehicle as we can while it’s on orbit.”                                                                                                                                                        Quelle: SN                                                                                                                                                           ----                                                                                                                                                                       Update: 23.05.2022                                                                                                                                           .                                                                                                                                                                          

Boeing's Starliner spacecraft is open for astronauts at space station for 1st time

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