NASA is currently unable to move the International Space Station's large robotic arm, which has a mass of nearly two metric tons and can handle payloads of up to 116 tons. The arm has been essential for berthing supply vehicles like the first version of SpaceX's cargo vehicle, Northrop's Cygnus, and Japan's HTV-X. Modern versions of Dragon and Boeing's Starliner now dock autonomously, but Cygnus and HTV-X cannot dock without the arm.

If NASA cannot use the arm, cargo missions face serious implications, especially with SpaceX planning to retire the Dragon vehicle within four years. The arm is also used to move large hardware outside the station, like cooling pumps, in preparation for spacewalks. NASA and partners could work around this loss, but operations would become more difficult.

The potential loss, even if temporary due to software issues, highlights that the station is approaching its 30th anniversary, operating beyond its planned lifetime. Aging has been graceful so far, but that may not continue. NASA plans to replace the ISS with privately developed stations, but that contracting process has not gone smoothly. The question remains: what happens if the bedrock of NASA's operations suddenly fails?