[RightWhale]

spaceflightnow.com
1448 GMT (10:48 a.m. EDT)

The space station's arm, operated by Expedition astronaut Jeff Williams and Atlantis astronaut Steve MacLean, is moving forward to capture the truss's second grapple fixture. Once the station arm has a firm lock on the truss, the shuttle's arm can let go.

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The ISS arm is an inchworm that can crawl all over the station.

[RightWhale]

spaceflightnow.com
1452 GMT (10:52 a.m. EDT)

Station's Canadarm2 has grappled the Port 3/Port 4 truss.

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17 tons is weightless but not massless

[RightWhale]

spaceflightnow.com
1455 GMT (10:55 a.m. EDT)

Steve MacLean, from the robotics work station inside the Destiny lab module, just radioed to Atlantis' flight deck that Dan Burbank can release the shuttle arm from the truss and back the crane away.

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STS-115 has docked with ISS BTW