At 8:26 a.m. EST, Discovery Mission Specialists Mike Barratt and Nicole Stott inched the 58-foot-long space station robotic arm onto a grapple fixture on the Permanent Multipurpose Module (PMM). The arm will lift the fully-loaded 28,353 pound PMM from space shuttle Discovery’s cargo bay and carry it to the Earth-facing port on the Unity node, where it will be permanently attached.