Backup Computer Glitches On Space Station But Crew Safe, NASA Says

A backup computer that controls “some systems associated with robotics” on the International Space Station is not “responding to commands”, NASA said in a late-night statement Eastern time Friday (April 11).

The crew is safe, there’s no “immediate” change to space station operations, and because the primary computer is working, there’s also no alteration to the SpaceX Dragon launch to the station on Monday — which requires the robotic Canadarm2 for berthing. NASA added, however, that there are “further evaluations” going on, meaning the date could change depending on what controllers figure out.

If the computer does need to be replaced, crew members of Expedition 39 will need to do at least one spacewalk, the agency added. NASA is allowing contingency spacewalks in American spacesuits to go forward as the agency addresses problems raised in a report about a life-threatening spacesuit leak in July.

Below the jump is the statement NASA put out tonight concerning the situation.

The Mission Control team at NASA’s Johnson Space Center in Houston confirmed Friday night that a backup computer on the exterior of the International Space Station (ISS) called a Multiplexer-Demultiplexer (MDM) is not responding to commands. The station’s MDM computers control some systems associated with robotics aboard the space station.

The primary MDM operating aboard the space station is functioning normally and there is no immediate impact to space station operations. The computer outage does not pose a risk to the six crew members aboard the space station. ISS teams are assessing next steps to attempt to bring the computer back online or replace it.

Replacing the backup MDM, if needed, would require a spacewalk. The backup MDM would provide redundancy for robotic systems that will be needed to attach the SpaceX Dragon spacecraft currently scheduled to launch on Monday and rendezvous with the ISS on Wednesday. NASA is continuing to work toward a Monday launch of the SpaceX cargo resupply mission pending further evaluations by the ISS Program. The latest information will be available here at

We will keep you apprised as the situation progresses.

Expedition 39’s crew portrait. Front row: commander Koichi Wakata (Japan Aerospace Exploration Agency) at right, and NASA astronaut Steve Swanson. Back row, left to right: Russian cosmonauts Oleg Artemyev, Alexander Skvortsov, Mikhail Tyurin and NASA astronaut Rick Mastracchio. Credit: NASA
Elizabeth Howell

Elizabeth Howell is the senior writer at Universe Today. She also works for, Space Exploration Network, the NASA Lunar Science Institute, NASA Astrobiology Magazine and LiveScience, among others. Career highlights include watching three shuttle launches, and going on a two-week simulated Mars expedition in rural Utah. You can follow her on Twitter @howellspace or contact her at her website.

Recent Posts

Astronomers Might Have Detected the Background Gravitational Waves of the Universe

A new data release from a gravitational wave consortium has revealed indications of the long…

15 hours ago

A Worldwide Search for Dark Matter Fails to Turn up a Signal for This Mysterious Particle

A global search for dark matter turns up nothing, but than in itself is useful.

18 hours ago

With Webb Safely Launched, Focus Shifts to the Ariane 6

Last month, an Ariane 5 rocket carried the James Webb Space Telescope (JWST) safely to…

19 hours ago

Curiosity Sees a Strong Carbon Signature in a Bed of Rocks

Carbon is critical to life, as far as we know. So anytime we detect a…

3 days ago

Bad Weather Postpones Ingenuity’s 19th Flight on Mars

The first flight of 2022 for the Ingenuity Helicopter has been delayed due to a…

3 days ago

If Launched by 2028, a Spacecraft Could Catch up With Oumuamua in 26 Years

A new study by the Institute of Interstellar Studies (i4is) shows that with the right…

3 days ago