The mission's fourth and final spacewalk with Mike Fincke and Greg Chamitoff is set to begin at 12:46 a.m. EDT and last approximately six and a half hours. The primary task of the spacewalk is to transfer the Orbiter Boom Sensor System from the shuttle to space station.
If all goes as planned, the total number of hours spent spacewalking for International Space Station assembly and maintenance is expected to surpass 1,000.
It will be the last spacewalk by space shuttle crew members. (A spacewalk during the program's final mission, STS-135, is to be conducted by space station residents.)
At about 9 p.m. Friday, Fincke will become the record-holder for the number of days a U.S. astronaut has spent in space, surpassing Peggy Whitson's total of 377 days.
The crew members for space shuttle Endeavour's STS-134 mission are Commander Mark Kelly, Pilot Gregory H. Johnson and Mission Specialists Michael Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori.
During the 16-day mission, Endeavour and its crew will deliver the Alpha Magnetic Spectrometer (AMS) and spare parts including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre.
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