the Space Shuttle robot arm using the station's SSRMS or Canadarm2. The shuttle arm was operated by Kay Hire and pilot Terry Virts. February 11 (Flight Day 4: Spacewalk 1 preparation) Flight day 4 saw Nick Patrick and Bob Behnken get all the tools they need ready for their spacewalk on flight day 5. While Patrick and Behnken were getting the tools ready, commander George Zamka and ISS flight engineer Soichi Noguchi swapped out the Hard Upper Torso (HUT) on Bob Behnken's suit, since the original HUT had developed a problem with a wire harness and was not powering the Wireless Video System (WVS) or the heaters in his gloves and boots. Once the swap was complete, Zamka and Noguchi tested the suit successfully. The crew also performed a number of transfer related activities during the morning of their work day. After a joint meal together, the crew of STS-130 and ISS commander Jeff Williams and flight engineer T.J. Creamer conducted a PAO event with T.V. stations in Sacramento, California, Mobile, Alabama and a radio station in St. Louis, Missouri. Once the PAO event was finished, the joint crews had some off duty time for the rest of the day. Before the two crews went to bed they conducted a spacewalk procedures review, then got Nick Patrick and Bob Behnken into the Quest Airlock. Behnken and Patrick spent the night there at 10.2 psi instead of at the station's 14.6 psi, breathing pure oxygen for an hour before and after their sleep period in order to prevent decompression sickness. February 12 (Flight Day 5: Spacewalk 1) Flight day 5 saw astronauts Nick Patrick and Bob Behnken perform the mission's first spacewalk, which began on time at 02:17 UTC. Their first task was to move the payload bay of Endeavour and prepare and release launch locks on the Tranquility module and Cupola. Once Behnken and Patrick were clear of its path, the Tranquility module was moved to the port side of the Unity node using the space station's robot arm. Before Tranquility was installed the spacewalkers removed Dextre's ORU platform and secured it to one of the truss segments to function as a backup for a platform to be installed on STS-132. Once the new module was in place, the spacewalkers proceeded to connect temporary heater and data cables between Unity and Tranquility. Behnken and Patrick were ahead of the timeline