{"id":468027,"date":"2023-07-25T15:17:07","date_gmt":"2023-07-25T19:17:07","guid":{"rendered":"https:\/\/www.nasa.gov\/?p=468027"},"modified":"2023-07-26T14:25:09","modified_gmt":"2023-07-26T18:25:09","slug":"astronauts-complete-short-spacewalk-to-replace-backup-computer","status":"publish","type":"post","link":"https:\/\/www.nasa.gov\/missions\/station\/astronauts-complete-short-spacewalk-to-replace-backup-computer\/","title":{"rendered":"Astronauts Complete Short Spacewalk to Replace Backup Computer"},"content":{"rendered":"<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"773\" height=\"435\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg?w=773\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"NASA Spacewalker Rick Mastracchio works outside the International Space Station to replace a failed Multiplexer\/Demultiplexer (MDM) back up computer.\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg 773w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg?resize=300,169 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg?resize=768,432 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg?resize=400,225 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg?resize=600,338 600w\" sizes=\"(max-width: 773px) 100vw, 773px\" loading=\"eager\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">NASA Spacewalker Rick Mastracchio works outside the International Space Station to replace a failed Multiplexer\/Demultiplexer (MDM) back up computer.<\/div><div class=\"hds-credits\">NASA TV<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p>NASA Astronauts Steve Swanson and Rick Mastracchio have completed a short spacewalk to replace a failed Multiplexer\/Demultiplexer (MDM) back up computer. They began the re-pressurization of the Quest airlock at 11:32 a.m. EDT signifying the excursion\u2019s end time.<\/p>\n\n\n\n<p>The backup computer failed April 11 after a routine health check by the Mission Control team in Houston. While the primary computer continues operating flawlessly NASA managers ordered Wednesday\u2019s spacewalk repair to ensure redundancy on critical systems. The computer outage did not pose a risk to the six crew members aboard the space station.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.nasa.gov\/content\/back-up-computer-not-responding-to-commands\/\">\u203a Read NASA\u2019s official statement on the backup computer failure<\/a><\/p>\n\n\n\n<p>The duo worked on the S0 truss which is where the backup MDM is located. The truss is located above the Destiny laboratory module and forms the center of the station\u2019s Integrated Truss Structure, or backbone. The MDM provides telemetry and commands to truss systems, solar alpha rotary joints and the Mobile Transporter rail car which rides along the truss structure.<\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214b.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214b.jpg?w=1024\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"NASA spacewalkers Rick Mastracchio and Steve Swanson.\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214b.jpg 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214b.jpg?resize=300,169 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214b.jpg?resize=768,432 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214b.jpg?resize=400,225 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214b.jpg?resize=600,338 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214b.jpg?resize=900,506 900w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">NASA spacewalkers Rick Mastracchio and Steve Swanson.<\/div><div class=\"hds-credits\">NASA TV<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p><a href=\"https:\/\/www.nasa.gov\/mission_pages\/station\/structure\/elements\/its.html\">\u203a Read about the S0 Truss and the Integrated Truss Structure<\/a><\/p>\n\n\n\n<p>Swanson and Mastracchio installed a spare MDM that was housed inside the Destiny lab since April 2001 when it was delivered aboard space shuttle Endeavour. They removed the failed MDM from the S0 truss where it has been located since the truss was delivered with the MDM already inside in April 2002. The station houses 45 MDMs, 24 internally and 21 externally.<\/p>\n\n\n\n<p>Station and SpaceX managers decided the computer failure wouldn\u2019t impact Sunday\u2019s arrival of the Dragon commercial cargo craft on the SpaceX-3 mission. After an engineering review of the station\u2019s systems it was determined the station had enough redundancy for SpaceX-3 to begin its mission when it launched Friday afternoon aboard a Falcon 9 rocket.<\/p>\n\n\n\n<p>Read about the SpaceX-3 <a href=\"https:\/\/www.nasa.gov\/content\/spacex-dragon-heads-to-space-station-astronauts-prep-for-wednesday-spacewalk\">launch<\/a> and <a href=\"https:\/\/www.nasa.gov\/content\/dragon-delivers-science-station-supplies\">docking<\/a>.<\/p>\n\n\n\n<p>A few hours earlier today an ISS Progress 53 resupply ship undocked from the Zvezda service module. It will back up about 311 miles from the space station so Russian mission controllers can test its upgraded Kurs automated rendezvous system. The Progress will redock again Friday at 8:15 a.m. to the Zvezda service module after the Kurs tests are complete.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NASA Astronauts Steve Swanson and Rick Mastracchio have completed a short spacewalk to replace a failed Multiplexer\/Demultiplexer (MDM) back up computer. They began the re-pressurization of the Quest airlock at 11:32 a.m. EDT signifying the excursion\u2019s end time. The backup computer failed April 11 after a routine health check by the Mission Control team in [...]<\/p>\n","protected":false},"author":133,"featured_media":468040,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"","nasa_hds_core_meta_linked_locations":[],"nasa_hds_core_meta_article_related_articles":[],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"footnotes":""},"categories":[3150,2735],"news-tags":[],"internal-terms":[],"coauthors":[10248],"parsely":{"version":"1.1.0","meta":{"@context":"https:\/\/schema.org","@type":"NewsArticle","headline":"Astronauts Complete Short Spacewalk to Replace Backup Computer","url":"https:\/\/www.nasa.gov\/missions\/station\/astronauts-complete-short-spacewalk-to-replace-backup-computer\/","mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/www.nasa.gov\/missions\/station\/astronauts-complete-short-spacewalk-to-replace-backup-computer\/"},"thumbnailUrl":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg?w=150&h=150&crop=1","image":{"@type":"ImageObject","url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg"},"articleSection":"Missions","author":[{"@type":"Person","name":"Mark A. Garcia"}],"creator":["Mark A. Garcia"],"publisher":{"@type":"Organization","name":"NASA","logo":"https:\/\/www.nasa.gov\/wp-content\/themes\/nasa\/assets\/images\/nasa-logo.svg"},"keywords":["Missions","International Space Station (ISS)","Expedition 39"],"dateCreated":"2023-07-25T19:17:07Z","datePublished":"2023-07-25T19:17:07Z","dateModified":"2023-07-26T18:25:09Z"},"rendered":"<meta name=\"parsely-title\" content=\"Astronauts Complete Short Spacewalk to Replace Backup Computer\" \/>\n<meta name=\"parsely-link\" content=\"https:\/\/www.nasa.gov\/missions\/station\/astronauts-complete-short-spacewalk-to-replace-backup-computer\/\" \/>\n<meta name=\"parsely-type\" content=\"post\" \/>\n<meta name=\"parsely-image-url\" content=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg?w=150&h=150&crop=1\" \/>\n<meta name=\"parsely-pub-date\" content=\"2023-07-25T19:17:07Z\" \/>\n<meta name=\"parsely-section\" content=\"Missions\" \/>\n<meta name=\"parsely-tags\" content=\"Missions,International Space Station (ISS),Expedition 39\" \/>\n<meta name=\"parsely-author\" content=\"Mark A. Garcia\" \/>","tracker_url":"https:\/\/cdn.parsely.com\/keys\/nasa.gov\/p.js"},"read_time":2,"time_ago":"11 months","featured_image":{"id":468040,"file":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2023\/07\/pic-042214a.jpg","title":"NASA Spacewalker Rick Mastracchio","alt":"NASA Spacewalker Rick Mastracchio works outside the International Space Station to replace a failed Multiplexer\/Demultiplexer (MDM) back up computer.","caption":"NASA Spacewalker Rick Mastracchio works outside the International Space Station to replace a failed Multiplexer\/Demultiplexer (MDM) back up computer."},"_links":{"self":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/468027"}],"collection":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/users\/133"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/comments?post=468027"}],"version-history":[{"count":3,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/468027\/revisions"}],"predecessor-version":[{"id":468056,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/468027\/revisions\/468056"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media\/468040"}],"wp:attachment":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media?parent=468027"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/categories?post=468027"},{"taxonomy":"news-tags","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/news-tags?post=468027"},{"taxonomy":"internal-terms","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/internal-terms?post=468027"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/coauthors?post=468027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}