NASA flight engineers Chris Williams and Jessica Meir will conduct a spacewalk tomorrow, June 30, to repair the International Space Station's robotic arm [1, 2].
The mission is critical because the Canadarm2 is the station's primary tool for capturing cargo vehicles and assisting with external maintenance. A failure in its movement limits the station's operational flexibility and its ability to manage arriving supplies.
The astronauts will exit the Quest airlock at 8:35 a.m. ET [4]. Their primary objective is to replace a faulty wrist joint that has rendered the robotic arm non-functional since May 27, 2026 [3, 7]. This joint is essential for the arm's precision and range of motion, capabilities that are necessary for the long-term viability of the orbital laboratory.
NASA expects the extravehicular activity to last between six and seven hours [1, 6]. The duration reflects the complexity of removing the damaged hardware and installing the new joint while floating in a vacuum. Live coverage of the event is scheduled to begin at 7 a.m. ET [4].
Williams and Meir have undergone extensive training to handle the specific mechanical requirements of the Canadarm2. The repair is a priority for station management to ensure that all primary systems are operational before future crew rotations or cargo arrivals. The robotic arm serves as the "hands" of the station, making its restoration a high-stakes technical task.
Once the new wrist joint is installed and tested, the arm will return to full service. This will allow the ISS to resume normal operations for docking and external repairs that have been delayed since the malfunction began in May [3].
“The Canadarm2 wrist joint has been non-functional since May 27, 2026.”
The failure of a primary component like the Canadarm2 wrist joint highlights the vulnerability of long-term orbital infrastructure. Because the arm is essential for capturing visiting spacecraft, any prolonged outage increases the risk of docking failures or delays in station upgrades. Successfully replacing the joint in situ demonstrates NASA's continued ability to perform complex orbital replacements, reducing the need to abandon faulty equipment in space.
