NASA astronauts Chris Williams and Jessica Meir are set to conduct a spacewalk outside the International Space Station (ISS) on June 30 to replace a malfunctioning component on the Canadarm2 robotic arm, a key piece of equipment that supports a wide range of station operations. The mission is expected to last approximately six hours and 40 minutes and is aimed at restoring the arm's full functionality after engineers identified a problem with one of its wrist joints.
According to NASA, the spacewalk is scheduled to begin at 8:35 a.m. EDT on June 30, which corresponds to 6:05 p.m. IST. During the operation, Williams and Meir will remove a faulty wrist joint assembly and install a spare unit that is already stored aboard the orbiting laboratory. The repair follows an investigation conducted jointly by NASA and the Canadian Space Agency (CSA), which determined that the damaged component could not be fixed remotely and required direct intervention by astronauts.
Canadarm2 is one of the most important robotic systems aboard the ISS. Built and operated with support from Canada, the robotic arm is used for a variety of critical tasks, including moving cargo spacecraft, assisting astronauts during spacewalks, relocating station hardware, and supporting maintenance activities. Having been in service for more than 25 years, the arm has played a central role in the assembly, expansion, and ongoing operation of the space station. The wrist joint being replaced is essential for providing the flexibility and range of motion required for the arm to perform these tasks effectively.
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Preparations for the spacewalk are already underway as mission teams work to ensure the astronauts are ready for the demanding repair mission. NASA recently conducted spacesuit checks and equipment tests to verify that all systems are functioning properly. Chris Williams completed a spacesuit fit and functionality assessment inside the station's Quest airlock, with assistance from European Space Agency astronaut Sophie Adenot. The checks included communications testing, mobility assessments, and evaluations of life-support systems that are crucial for astronaut safety during operations in the vacuum of space.
Spacewalks, also known as extravehicular activities (EVAs), remain among the most challenging tasks undertaken by astronauts. Working outside the station requires careful planning, extensive training, and coordination with mission controllers on the ground. Even routine maintenance operations can become complex due to the harsh conditions of space, where astronauts must contend with extreme temperatures, limited mobility, and the need to secure tools and equipment while floating in microgravity.
The upcoming mission highlights the importance of ongoing maintenance aboard the ISS as the station continues to support scientific research, technology demonstrations, and international collaboration in space. By replacing the damaged wrist joint, NASA and its international partners aim to ensure Canadarm2 remains fully operational for future missions and station activities. The successful repair will help maintain one of the ISS's most valuable assets as the orbiting laboratory continues its work more than two decades after its first modules were launched into space.
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