The Endeavour crew and Expedition 28 crew woke at 7:56 p.m. EDT to the song “Real World” by Matchbox 20, played for Pilot Greg Johnson.
The focus of today’s activity will be the mission’s third spacewalk, conducted by Drew Feustel and Mike Fincke. At 9:11 p.m., they begin preparations for the In-Suit Light Exercise protocol that is being used instead of camping out in the airlock the night before. At 11:36 p.m., they will begin the process. The spacewalk is scheduled to begin at 1:46 a.m.
The spacewalk will start with Feustel and Fincke doing some setup work at the Zarya module in preparation for the additional of a power and data grapple fixture to its exterior. They will move tools and equipment into place and remove caps covering the installation location. They will then return to the Quest airlock and bring out the grapple fixture and the interface equipment to which it will attach, called the PAMA. The size of the hardware will require both spacewalkers to carry it together.
Once they arrive back at Zarya, they will install the PAMA and the attached grapple fixture. Once it is installed, they will move on to connecting and setting it up.