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Forum:Soviet - Russian Space
Topic:Soyuz MS-02: Viewing, comments, questions
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Robert PearlmanThe hatch between the Soyuz MS-02 spacecraft and the International Space Station was closed at 11:45 p.m. EDT on Sunday (April 9) as NASA astronaut Shane Kimbrough and Roscosmos cosmonauts Sergey Ryzhikov and Andrei Borisenko prepared to depart the outpost for their return to Earth.

The following times are in Central Daylight Time (CDT, GMT+5) on April 10:

  • 2:56 a.m.: Soyuz Undock Command Sent
  • 2:57 a.m.: Soyuz Undocking from Space Station
  • 3:00 a.m.: Separation Burn 1
  • 3:01 a.m.: Separation Burn 2
  • 5:28 a.m.: Soyuz Deorbit Burn (4 minutes, 38 seconds duration)
  • 5:55 a.m.: Soyuz Module Separation (altitude ~87 miles)
  • 5:58 a.m.: Soyuz Atmospheric Entry (altitude ~62 miles)
  • 6:06 a.m.: Command to Open Chutes (altitude 6.7 miles)
  • 6:21 a.m.: Soyuz MS-02 landing southeast of Dzhezkazgan, Kazakhstan
Robert PearlmanAn on-target, on-time (6:20:35 a.m. CDT) landing for Soyuz MS-02.

Live video from Kazakhstan caught seldom-seen views the venting of hydrogen peroxide from the spacecraft's control system and the jettison of the heat shield soon after the main parachute deployed.

Robert PearlmanShane Kimbrough, Sergey Ryzhikov and Andrei Borisenko seen after landing. Credit: NASA/Bill Ingalls

Robert PearlmanShane Kimbrough has arrived back in Houston. This was the first operational use of NASA's new Gulfstream V (NASA5), acquired from Nike.

GACspaceguyAlways good to see a Gulfstream supporting NASA!
Robert Pearlman
quote:
Originally posted by Robert Pearlman:
Live video from Kazakhstan caught seldom-seen views the venting of hydrogen peroxide from the spacecraft's control system...
From NASA photographer Bill Ingalls on Facebook:
I was looking at my landing photos from last week with fresh eyes. The first frames I shot had the Soyuz so small in the frame that I dismissed them. After a more careful review, and zooming in like crazy, I noticed that I had caught the hydrogen peroxide purge which I had never seen before.
Robert PearlmanSoyuz MS-02 experienced a partial loss of pressure during the final stages of its descent, but did not put the crew's lives in danger, SpaceNews reports.
...Thomas Stafford, a former astronaut, said the incident took place when the main parachute of the Soyuz spacecraft deployed about eight kilometers above the landing site in Kazakhstan. A buckle that is part of the parachute system struck the capsule.

"The buckle struck a welding seam and, as a result, there was a depressurizing event that resulted in some air escaping the capsule," he said.

...The partial loss of pressure did not put the crew in jeopardy, Stafford said. A valve normally opens once the capsule descends to an altitude of five kilometers to allow outside air into the capsule. The crewmembers were also wearing pressure suits, as is standard procedure on Soyuz landings.

"Since the crew was suited, the depressurization presented no issue for the crew," Stafford said, adding that they knew about the issue from sensors in the spacecraft.

At a June meeting of Stafford's committee with its Russian equivalent, Stafford said that Russian officials believed that the way the parachute was folded inside the Soyuz may have caused the buckle to hit the capsule during deployment, with the angle of the spacecraft during reentry also possibly playing a role.

Stafford said there was no record of a similar event taking place in previous Soyuz landings. "Work has been done to review the anomaly, and mitigation steps were implemented to ensure it will not happen in the future," he said.

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