Tag Archives: spacewalk

Short Spacewalk Complete After Successful Installation Work

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Astronaut Jack Fischer

Astronaut Jack Fischer waves while attached to the Destiny laboratory during a spacewalk to replace a failed data relay box and install a pair wireless antennas.

Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer of NASA concluded their spacewalk at 10:06 a.m. EDT. During the spacewalk, which lasted two hours and 46 minutes, the two astronauts successfully replaced a computer relay box, and installed a pair of antennas on station to enhance wireless communication for future spacewalks.

Spacewalkers have now spent a total of 1,250 hours and 41 minutes working outside the station during 201 spacewalks in support of assembly and maintenance of the orbiting laboratory. This was the 10th spacewalk for Whitson, who moves into third place all-time for cumulative spacewalking time, and the second for Fischer.

For more information about the International Space Station, visit www.nasa.gov/station.

Two NASA Astronauts Begin Station Spacewalk

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Astronaut Peggy Whitson

Astronaut Peggy Whitson is pictured May 12, 2017, during the 200th spacewalk at the International Space Station.

Two NASA astronauts switched their spacesuits to battery power this morning at 7:20 a.m., EDT aboard the International Space Station to begin a spacewalk planned to last about 2.5 hours. Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer will replace a critical computer relay box.

The relay box, known as a multiplexer-demultiplexer (MDM), is equipped with upgraded software installed in the truss March 30 during a spacewalk by Whitson and Expedition 50 commander Shane Kimbrough. Whitson prepared a spare data relay box on Sunday and tested components installed in the replacement. She reported the spare MDM was ready to be brought outside to replace the failed unit.

While Whitson is replacing the MDM, Fischer will install a pair of antennas on the U.S. Destiny Laboratory module to enhance wireless communication capability for future spacewalks. That task was deferred from Whitson and Fischer’s May 12 spacewalk.

Whitson is wearing the suit with red stripes as extravehicular crew member 1 (EV 1). Fischer, extravehicular crew member 2 (EV 2), is wearing the suit with no stripes.

Watch the spacewalk on NASA TV and on the agency’s website.

Follow @space_station on Twitter for updates. Learn more about the International Space Station online, including additional information about the current crew members.


Get weekly video highlights at: http://jscfeatures.jsc.nasa.gov/videoupdate/

NASA TV Live Broadcasts Tuesday Spacewalk

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Astronauts Jack Fischer and Peggy Whitson

NASA astronauts Jack Fischer (left) and Peggy Whitson are outfitted in their U.S. spacesuits inside the U.S. Quest airlock before beginning the 200th spacewalk in support of International Space Station maintenance and assembly on May 12, 2017.

Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer of NASA will venture outside the International Space Station for a 2.5-hour contingency spacewalk Tuesday, May 23. The spacewalk will begin about 8 a.m. EDT, with complete coverage on NASA Television and the agency’s website beginning at 6:30 a.m.

Whitson and Fischer will replace a critical computer relay box that failed on Saturday, May 20. The relay box, known as a multiplexer-demultiplexer (MDM), is one of two units that regulate the operation of radiators, solar arrays and cooling loops. They also will route commands to other vital station systems and install a pair of antennas to enhance wireless communication.

Because each MDM is capable of performing the critical station functions, the crew on the station was never in danger and station operations have not been affected.

The spacewalk will be the 201st in support of space station assembly and maintenance, the sixth spacewalk conducted from the Quest airlock this year, the 10th for Whitson and the second for Fischer.

Follow @space_station on Twitter for updates. For more information about the International Space Station, visit www.nasa.gov/station.

Astronauts Review Plans, Ready Gear for Tuesday Spacewalk

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The International Space Station

The International Space Station with its prominent solar arrays and radiators attached to the truss structure was pictured May 2010 from space shuttle Atlantis.

Astronauts Peggy Whitson and Jack Fischer are getting ready for a contingency spacewalk Tuesday morning. Whitson and Fischer are set to begin the spacewalk at 8 a.m. Tuesday for about two hours of maintenance work. NASA Television coverage will begin at 6:30 a.m.

The spacewalkers are gathering their tools and checking their spacesuits today with assistance from Flight Engineer Thomas Pesquet. The trio are also reviewing the contingency spacewalk procedures.

The spacewalk’s primary task is the removal and replacement of a data relay box, known as a Multiplexer-Demultiplexer (MDM), which failed Saturday morning. The MDM controls the functionality of station components such as the solar arrays, radiators, cooling loops and other systems.

Whitson will replace the failed MDM with a spare unit on the Starboard Zero truss. The truss is attached to the space-facing side of the U.S. Destiny lab module and is the centerpiece of the station’s truss structure which houses the solar arrays, radiators and cooling loops. Fischer will install a pair of wireless communications antennas on the Destiny Lab, a task that was postponed during the May 12 spacewalk.

Tuesday’s spacewalk will be the 201st in support of station assembly and maintenance. This will be Commander Whitson’s 10th spacewalk likely moving her to third place all-time in cumulative spacewalking time. Flight Engineer Fischer will be embarking on his 2nd spacewalk.

Station Managers Give Go for Tuesday Spacewalk

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The International Space Station

This picture of the International Space Station was photographed from the space shuttle Atlantis as the orbiting complex and the shuttle performed their relative separation in the early hours of July 19, 2011.

International Space Station Program managers have given the green light for a contingency spacewalk on Tuesday by two Expedition 51 crewmembers to change out a multiplexer-demultiplexer (MDM) data relay box on the S0 truss that failed on Saturday morning. The cause of the MDM failure is not known. After a review of spacewalk preparations and crew readiness throughout the day Sunday, the decision was made to press ahead with the spacewalk on Tuesday. It will be conducted by Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer of NASA.

The data relay box is one of two fully redundant systems housed in the truss that control the functionality of radiators, solar arrays, cooling loops and other station hardware. The other MDM in the truss is functioning perfectly, providing uninterrupted telemetry routing to the station’s systems. The crew has never been in any danger, and the MDM failure, believed to be internal to the box itself, has had no impact on station activities.

On Sunday morning, Whitson prepared a spare data relay box and tested components installed in the replacement. She reported that the spare MDM was ready to be brought outside to replace the failed unit. Back on March 30, Whitson and Expedition 50 commander Shane Kimbrough of NASA conducted a spacewalk to install the same MDM with upgraded software tat failed Saturday.

A similar MDM replacement spacewalk was conducted in April 2014 by Expedition 39 crewmembers Steve Swanson and Rick Mastracchio of NASA.

Tuesday’s spacewalk will last about two hours in duration to replace the failed box. An additional task was added for Fischer to install a pair of wireless communications antennas on the Destiny Lab while Whitson replaces the failed data relay box. The antenna installation task was originally planned for the last spacewalk on May 12.

The contingency spacewalk will be the 201st in support of space station assembly and maintenance and the sixth conducted from the Quest airlock this year.

This will be the 10th spacewalk in Whitson’s career and the second for Fischer. Whitson will be designated as extravehicular crewmember 1 (EV 1) and will wear the suit with the red stripes. Fischer will be extravehicular crewmember 2 (EV 2) and will wear the suit with no stripes.

Tuesday’s spacewalk is expected to begin around 8 a.m. EDT, or earlier, if the crew is running ahead of schedule with its spacewalking preparations. NASA Television coverage will begin at 6:30 a.m.

Spacewalk Planned to Change Out Failed Relay Box

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Astronaut Peggy Whitson

Astronaut Peggy Whitson is pictured with the Orbital ATK Cygnus resupply ship behind her during a spacewalk on May 12, 2017.

International Space Station Program managers met Sunday and gave approval for a contingency spacewalk no earlier than Tuesday by two Expedition 51 crewmembers to change out a multiplexer-demultiplexer (MDM) data relay box on the S0 truss that failed on Saturday morning. The cause of the MDM failure is not known. A final decision on a firm date for the spacewalk and who will conduct the spacewalk will be made later in the day Sunday.

The data relay box is one of two fully redundant systems housed in the truss that control the functionality of radiators, solar arrays, cooling loops and other station hardware. The other MDM in the truss is functioning perfectly, providing uninterrupted telemetry routing to the station’s systems. The crew has never been in any danger and the MDM failure, believed to be internal to the box itself, has had no impact on station activities.

On Sunday, shortly before managers met to discuss the forward plan for dealing with the failed MDM, station commander Peggy Whitson of NASA prepared a spare data relay box and tested components installed in the replacement. She reported that the spare MDM was ready to be brought outside to replace the failed unit. Back on March 30, Whitson and Expedition 50 commander Shane Kimbrough of NASA conducted a spacewalk to install the MDM with upgraded software that failed Saturday.

A similar MDM replacement spacewalk was conducted in April 2014 by Expedition 39 crewmembers Steve Swanson and Rick Mastracchio.

The spacewalk will last about two hours in duration to replace the failed box. No other tasks are planned for the excursion. It will be the sixth spacewalk conducted from the Quest airlock this year.

200th Station Spacewalk Comes to an End

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Astronaut Jack Fischer

Astronaut Jack Fischer is tethered to the outside of the International Space Station during the 200th spacewalk to install and repair gear with astronaut Peggy Whitson.

Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer of NASA concluded their spacewalk at 1:21 p.m. EDT. During the spacewalk, which lasted just over four hours, the two astronauts successfully replaced a large avionics box that supplies electricity and data connections to the science experiments.

The astronauts also completed additional tasks to install a connector that will route data to the Alpha Magnetic Spectrometer, repair insulation at the connecting point of the Japanese robotic arm, and install a protective shield on the Pressurized Mating Adapter-3. This adapter will host a new international docking port for the arrival of commercial crew spacecraft.

Spacewalkers have now spent a total of 1,247 hours and 55 minutes working outside the station during 200 spacewalks in support of assembly and maintenance of the orbiting laboratory. The first spacewalk in support of International Space Station assembly and maintenance was conducted on Dec. 7, 1998, by NASA astronauts Jerry Ross and Jim Newman during space shuttle Endeavour’s STS-88 mission. Astronauts completed attaching and outfitting of the first two components of the station, the Russian Zarya module and the U.S. Unity module.

 

For more information about the International Space Station, visit www.nasa.gov/station.

200th Spacewalk at Station Begins

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Astronaut Peggy Whitson

Astronaut Peggy Whitson is pictured during her eighth spacewalk which took place March 30, 2017.

The 200th spacewalk aboard the International Space Station began this morning at 9:08 a.m. EDT for a spacewalk planned to last about four hours.

Managers in mission control decided to shorten the spacewalk from the original six and a half hour plan, due to available battery power for the spacesuits. During earlier spacewalk preparations, Whitson and Fischer shared a service and cooling umbilical (SCU) after a small water leak was detected in a second SCU that was connected the Fischer’s suit. This was not a leak in Fischer’s suit. The SCU is an airlock component used to provide electricity, cooling and communications to the crew while performing their pre-breathe activities in the Equipment Lock. The sharing of the SCU resulted in additional draw in battery power from the suits during preparations while in the Equipment Lock, reducing the battery power available for use during the spacewalk.

During the abbreviated spacewalk, Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer of NASA will tackle the principle objective to replace a large avionics box that supplies electricity and data connections to the science experiments, and replacement hardware stored outside the station. The ExPRESS Carrier Avionics, or ExPCA is located on the starboard 3 truss of the station on one of the depots housing critical spare parts.

Watch the spacewalk on NASA TV and on the agency’s website.

Whitson is wearing the suit with red stripes as extravehicular crew member 1 (EV 1). Fischer, extravehicular crew member 2 (EV 2), is wearing the suit with no stripes.

Two Astronauts Set For 200th Station Spacewalk Today

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Space Selfie

This space selfie was taken during the last spacewalk on March 30 with astronauts Peggy Whitson and Shane Kimbrough.

Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer of NASA will venture outside the International Space Station for a six-and-a-half hour spacewalk Friday, May 12. The spacewalk will begin at about 8 a.m. EDT, with complete coverage on NASA Television and the agency’s website starting at 6:30 a.m.

Whitson and Fischer will replace a large avionics box that supplies electricity and data connections to the science experiments, and replacement hardware stored outside the station. The ExPRESS Carrier Avionics, or ExPCA is located on the starboard 3 truss of the station on one of the depots housing critical spare parts. It will be replaced with a unit delivered to the station last month aboard the Orbital ATK Cygnus cargo spacecraft.

This will be the 200th spacewalk in support of space station assembly and maintenance. Whitson, who already holds the U.S. record for most spacewalks by a female astronaut, will make this ninth excursion as extravehicular crew member 1, wearing the suit with red stripes. Fischer, extravehicular crew member 2, will wear the suit with no stripes on his first-ever spacewalk.

Astronauts Wrap Up Preps for 200th Station Spacewalk

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Astronaut Jack Fischer

Astronaut Jack Fischer is pictured wearing a U.S. spacesuit during a fit check in preparation for his first spacewalk.

Commander Peggy Whitson will work outside the space station for the ninth time in her career on Friday. She will be joined by Flight Engineer Jack Fischer who will embark on his first spacewalk. The duo will exit the Quest airlock around 8 a.m. EDT for about 6.5 hours of external tasks.

They will replace an avionics box that provides power to science experiments, install a shield on the Pressurized Mating Adapter-3 and rig a new high-definition camera and pair of wireless antennas. NASA TV will broadcast live the 200th spacewalk at the station for assembly and maintenance starting at 6:30 a.m.

Whitson is also in the second week of a study that explores the differences in bone structure on Earth and in space. She swapped bone cell media inside the Microgravity Science Glovebox which is then stowed inside a science freezer. The experiment samples will be returned to Earth on a future SpaceX Dragon mission for analysis by scientists.


Get weekly video highlights at: http://jscfeatures.jsc.nasa.gov/videoupdate/

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