Overview
Recently, the astronauts on board the International Space Station performed a routine "walk-off" maneuver with the large, 58-foot-long robotic arm attached to the orbiting laboratory.
The robotic arm, known as Canadarm2 because it was supplied by the Canadian Space Agency, is something of a modern engineering miracle—it can effectively move around the exterior of the large space station like an inchworm because both ends are essentially identical.
However, after this particular walk-off maneuver, the robotic arm, along with the mobile transporter that guides it along the main truss of the space station, could no longer be moved.
Details
Source
Originally published at arstechnica.com.