Jessica Meir Begins 5th ISS Spacewalk to Repair 57-Foot Robotic Arm

Q: Does the Canadarm2's 25-year lifespan prove modular design is key for future deep-space missions?

Not by itself, but Canadarm2 is strong evidence that modular design is essential for long-duration space systems. The arm has lasted about 25 years, well beyond its roughly 15-year design life, and NASA says that was possible because it was built with replaceable parts and planned in-orbit maintenance. Today’s repair is a clear example: astronauts are swapping out a failed wrist joint using a spare already stored on the ISS, rather than losing the entire system. That is exactly the kind of resilience future missions will need. Still, Canadarm2 does not “prove” modularity alone is the answer for deep-space missions. The ISS is in low Earth orbit, where astronauts can perform EVAs, mission control can provide continuous support, and spare hardware can be launched. Deep-space missions to the Moon, Mars or beyond will face much longer delays, tighter mass limits, harsher radiation and far fewer rescue options. A modular system is only useful there if crews or robots can actually diagnose, access and replace the failed part. What Canadarm2 does show is that maintainability must be designed in from the start. The broader industry trend supports that view: modular avionics, standardized interfaces and serviceable subsystems are increasingly seen as ways to cut risk, simplify testing and extend mission life. For deep space, the lesson is not just “make it modular,” but “make it repairable with the tools, spares and autonomy available far from Earth.”

3 articles · Updated · WGME · Jun 30

Jessica Meir began a roughly 6.5-hour spacewalk Tuesday at 8:35 a.m. to fix a wrist joint on the International Space Station’s robotic arm.
The 57-foot Canadarm2 is critical for capturing supply spacecraft, and Meir is using a smaller robotic arm during the repair alongside NASA astronaut Chris Williams.
The mission follows a May 27 malfunction in the joint, which drew elevated motor current and failed to move as expected; a 200-pound spare was already aboard the station.
For Meir, the outing is her fifth spacewalk and second with Williams, extending a career that included the first all-female spacewalk in 2019.