[15] The Lightweight Multi-Purpose Equipment Support Structure Carrier (LMC) carried a refurbished Ammonia Tank Assembly (ATA) to the ISS.

Geometric information contained in successive 3D images is matched against the known shape of the target object to calculate its position and orientation in real-time.

[16] The mission marked:[17] Space Shuttle Discovery was moved from its hangar in the Orbiter Processing Facility (OPF) 3 to the nearby Vehicle Assembly Building (VAB) on February 22, 2010.

[20][21] An earlier plan to move Discovery into the VAB on February 12, 2010, was delayed because of cold weather at the Kennedy Space Center.

[6][22] For the rollover, temperatures in the VAB had to be above 45 °F (7 °C) for more than twelve hours because Discovery was not attached to any heating purges to protect its systems from potential damage from the cold.

Commander Alan Poindexter and pilot Jim Dutton, with help from mission specialist 2 Dorothy Metcalf-Lindenburger, also performed a series of engine firings or burns to adjust their speed and refine their path to the International Space Station.

While the engine burns were going on, the rest of the crew opened the payload bay doors, set up the computers and Ku band antenna.

[27] The crew on board will monitor the inspections of the thermal protection system (TPS) in real time and will note any spots of interest and let the ground know while downlinking the imagery after docking.

After their post sleep activities, commander Alan Poindexter and pilot Jim Dutton fired Discovery's Orbital Maneuvering System (OMS) engines to correct and further refine the shuttle's path to the ISS.

Astronauts Naoko Yamazaki and Dorothy Metcalf-Lindenburger began activating and checking out the Shuttle Remote Manipulator System (SRMS) also known as the Canadarm.

[29] While Metcalf-Lindenburger and Yamazaki were working with Canadarm, Stephanie Wilson was getting equipment together and set up to record the inspections of the shuttle's heat shield.

Once all that work was done, commander Poindexter and pilot Dutton joined Metcalf-Lindenburger, Yamazaki, and Wilson to conduct the inspection of the shuttle's heat shield.

While the inspection was going on, Rick Mastracchio and Clayton Anderson were on the mid-deck of Discovery checking out the Extravehicular Mobility Units (EMU) and getting them ready for their three spacewalks.

On flight day 4, Stephanie Wilson and Naoko Yamazaki grappled and berthed the Multi-purpose Logistics Module (MPLM) Leonardo.

The hatches were opened by station flight engineer Soichi Noguchi and shuttle mission specialist Clayton Anderson at 11:58 UTC (07:58 EDT).

The joint STS-131/Expedition 23 crews began transferring cargo from the MPLM, with the first item being a Rate Gyro Assembly (RGA) which will be replaced on the first spacewalk of the mission.

They also removed an experiment from outside on the Kibo Exposed Facility, replaced a Rate Gyro Assembly (RGA) and performed several get-ahead tasks.

While the spacewalk took place, Naoko Yamazaki was assisted by commander Alan Poindexter, and the Expedition 23 crew to move several of the large science racks from the MPLM Leonardo to their new location on the ISS.

Mission specialist Naoko Yamazaki, along with flight engineer Soichi Noguchi also transferred the Express Rack 7 (ER7) to its final location.

[39] Later in the day commander Alan Poindexter, pilot Jim Dutton and mission specialist Dorothy Metcalf-Lindenburger talked with students at the Naval Postgraduate School in Monterey, California.

After the procedures review spacewalkers Clay Anderson and Rick Mastracchio entered the Quest airlock, closed the hatch and lowered the inside pressure to 10.2 psi.

While Anderson and Mastracchio were outside, members of the STS-131 crew continued transferring items from Space Shuttle Discovery's mid-deck and the MPLM Leonardo.

While the EVA was going on, commander Alan Poindexter and mission specialist Naoko Yamazaki continued transferring items from the MPLM to the ISS.

The delay in unberthing was caused by a set of bolts on the Common Berthing Mechanism (CBM) getting stuck due to a broken pin.

On flight day 12, the crew of Space Shuttle Discovery secured the MPLM Leonardo in the payload bay for return to Earth.

The pair were joined by commander Alan Poindexter and mission specialist Naoko Yamazaki to complete the inspection of the shuttle's Reinforced Carbon-Carbon (RCC) panels on the wings and nose and the heat-resistant tiles.

After Discovery departed from the ISS, pilot Jim Dutton took control of the shuttle and performed a fly around of the space station.

These preparations include closing the payload bay doors, activating the Flash Evaporator System (FES) and getting into their Advanced Crew Escape Suits (ACES).

[1] The main objectives for the three EVAs were as follows: NASA began a tradition of playing music to astronauts during the Gemini program, which was first used to wake up a flight crew during Apollo 15.