NASA Astronauts to Go on Emergency Spacewalk Outside International Space Station

Posted May 22, 2017

Stott was in the NASA astronaut corp and flew in space for over 100 days, flying on shuttle and spending time on the International Space Station.

The device failed on Saturday, leaving the laboratory to depend on its backup systems to route commands as necessary to its power systems, radiators and other equipment.

The cause of the MDM failure is not known.

'The other MDM in the truss is functioning perfectly, providing uninterrupted telemetry routing to the station's systems. It is a fully redundant system and ISS is now running as expected using the backup box.

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.

Astronauts on the International Space Station will conduct a spacewalk as soon as Tuesday to replace a malfunctioning data relay box, according to NASA.

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The failure of the box, the reason for which has not been identified yet, has not disrupted the station's activities and the crew is not in any danger.

NASA's last emergency space walk took place in December 2015 when two United States astronauts left the station to release the brakes on a robot arm's mobile transporter. The reason for the March installation was a scheduled software upgrade.

The last spacewalk by astronauts on board was conducted by Fischer and Whitson on May 12.

The last emergency spacewalk on the ISS took place in December 2015, when two crew members were sent out to fix a problem with the satellite's Mobile Servicing System - the robotic arm used for maintenance and receiving cargo payloads sent up from earth.

The station, owned and operated by 15 nations, flies about 400 km above the Earth and orbits the planet about every 90 minutes.

It has been continuously staffed since 2000.