Updated

Updated · NASA · Jun 30

Williams, Meir Replace Canadarm2 Joint in 7-Hour ISS Spacewalk as NASA Restores Power

Updated

Updated · NASA · Jun 30

Williams, Meir Replace Canadarm2 Joint in 7-Hour ISS Spacewalk as NASA Restores Power

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 · NASA · Jun 30

7 hours and 20 minutes after stepping outside the ISS, Chris Williams and Jessica Meir finished replacing a wrist joint on the Canadarm2 robotic arm and ended the spacewalk at 3:40 p.m. EDT.
NASA Mission Control in Houston then powered up Canadarm2 and confirmed initial power and data connectivity, with ground controllers set to begin moving the arm over the coming week as checkouts continue.
The joint was swapped out after a May 27 malfunction, when the arm drew elevated motor current and failed to move as expected during normal operations.
Canadarm2 has operated continuously for more than 25 years and was built for replaceable parts and planned maintenance; the faulty joint will be returned to Earth for inspection and possible refurbishment.