Wednesday, January 24, 2018

Astronauts Replace Canadarm2 ‘Hand’ on ISS in First Spacewalk of 2018

Spacewalker Mark Vande Hei took his own photograph during the first spacewalk of 2018. These sky-high pictures are better known as “space-selfies.” Credit: NASA

The first spacewalk of 2018, U.S. EVA 47, is now in the history books after two NASA astronauts completed a nearly 7.5 hour extravehicular activity to replace an aging latching end effector on the International Space Station’s robotic Canadarm2.

Canadarm2 has a latching end effector, also called a LEE, on either side of the 58-foot (17-meter) robotic arm to either grab onto the exterior of the station, move objects around the outpost, or grab visiting spacecraft.

Launched in 2001 during Space Shuttle Endeavour’s STS-100 mission, the Canadian-built arm was designed to be serviced and refurbished in orbit. As such, in 2015, both end effectors, LEE-A and LEE-B, were lubricated during several spacewalks to extend the life of the “hands” of the outpost.

But with the LEEs more than 15 years in age, it was time to replace them. LEE-A was replaced over the course of three spacewalks in October 2017.

LEE-B was replaced during this spacewalk, U.S. EVA-47. LEE-B was originally planned to be replaced first, but a motor stall in the latches of LEE-A prompted NASA to switch the order.

The two Expedition 54 astronauts that performed this spacewalk were NASA’s Mark Vande Hei, who wore the spacesuit with red stripes and was designated EV-1, and Scott Tingle, who wore a space suit with no stripes and was designated EV-2.

After suiting up and squeezing inside the station’s Quest airlock, the chamber that leads to the exterior of the outpost, was sealed off from the rest of the lab with the duo inside and slowly depressurized.

U.S. EVA 47 began at 6:49 a.m. EST (11:49 GMT) Jan. 23, 2018, when Vande Hei and Tingle switched their spacesuits to battery power.

Not long after the start of the spacewalk, the first of several time-delaying issues cropped up. Vande Hei’s Display and Control Module on his suit locked up requiring him to completely reboot his suit.

Once it was verified his equipment was working, he and Tingle moved to External Stowage Platform 2 (ESP-2) to set up their work area. This involved placing two foot restraints on the platform so that the duo would be able to work on Canadarm2 with their feet attached to the station.

LEE-B was also at ESP-2. It was brought to the outpost during Space Shuttle Atlantis’ STS-129 mission in 2009.

The first order of business for the crew was to prepare the spare LEE for installation. This included removing insulation blankets and opening four launch locks to rotate the end effector upright allowing the astronauts to get to the ring where six bolts are holding it to the platform.

The first few bolts were released before the astronauts got onto their foot restraints to focus on the LEE-B attached to Canadarm2.

Just like on the spare, insulation blankets were removed to gain access to the ring attaching LEE-B to the arm’s wrist joint. The first two bolts were removed using the Pistol Grip Tool (PGT), a space-grade power tool. Once the bolts were released, Japanese astronaut Norishige Kanai, who was inside the station, commanded Canadarm2 to rotate LEE-B to give Vandi Hei access to the next set of bolts.

Written by: Derek Richardson
Original source:


  1. NASA has done a great job again. They are working day and night to make this world interplanet. People are talking about their success of a new rocket for Mars at and some other places. Thanks a lot for this interesting information that you have shared with us.

  2. Nasa astronauts have been doing the most amazing missions that I like to know about all the time. It is all about the things they have been doing custom essay writing service in the space while they are staying around.

  3. President Eisenhower established the National and Space Administration in 1958, partially in response to the Russian’s launch of the first artificial satellite the previous year. Reliable Dissertation Writing Service UK is establish for the helping of academic writing.

  4. On November 13, 2008, NASA announced that the Hubble Space Telescope has taken a snapshot of a planet circling the star Fomalhaut.

  5. Many times students are tensed for their projects and assignments, so at that time they can take online assignment help to complete it on time. There are experts available online who prepare the perfect assignment for you. Assignment Help

  6. you can go through reviews. It will help you to know about the services, and it will help you to know whether that site is reliable or not. This is a way of understanding the opinion of users, and it helps the website to maintain its functionality and reliability.

  7. Would like to get assignment help Brisbane in Australia? Get it right from here at

  8. Students Assignment Help offers the best Essay Writing UK understudies by its profoundly qualified and master Essay Writers UK. You can complete your homework task on schedule for all the scholastic dimension at the most reduced cost.

  9. In line with NASA, American and jap astronauts will perform these spacewalks in January to repair a robotic arm at the worldwide area station. Nasa astronauts on Tuesday conducted the first spacewalk of the year while operating on a robotic arm. Knowledge delivered by Get Assignment Help Cheap | All Assignment Help Australia.

  10. I am an academic writer, blogger and an education freak who keeps on exploring the education industry. I am working with GoAssignmentHelp from past few years and have been indulged into delivering quality help with constitutional law assignment for students.

  11. NASA astronauts were doing the most extremely good missions that I love to recognize approximately all the time. It is all about the matters they were doing UK Dissertation Writer in the space whilst they may be staying around. It'll help you to know about the offerings, and it'll assist you to recognize whether or not that website online is reliable or now not.

  12. The best dissertation data analysis writing services online, offered by Dissertation Firm has no bounds. We offer multiple channels of communication, thus allowing our clients to educate themselves about any feature of our service. Our amiable customer service agents have made themselves available via 24-hour live chat, phone line and e-mail. Contact us today to learn more about our service.

  13. According to, "The spaceflight version of unplugging and plugging a device back in – worked. Once the arm was powered back on, ground controllers confirmed all was operating well and the new LEE-B was in a healthy condition. Over the next several days, more checkouts will be performed to verify all is indeed well with the new end effector." Online assignment writing service

  14. Hey, Your blog is very informative. It is nice to read such high-quality content. Attractive information on your blog, thank you for taking the time and share with us. Myassignmenthelp delivers high-quality content related to perfect essay help.

  15. Hey, Your blog is very informative. It is nice to read such high-quality content. Attractive information on your blog, thank you for taking the time and share with us. Myassignmenthelp delivers high-quality content related to how to make a perfect essay.