The first KSC landing opportunity today would begin with a deorbit burn of Endeavour's large orbital maneuvering engines at 10:50 a.m. resulting in an 11:55 a.m. central time (12:55 p.m. eastern) landing. If weather precludes landing on that first opportunity, there is a second opportunity, one orbit later, with an engine firing at 12:28 p.m. resulting in a 1:32 p.m. central (2:32 p.m. eastern) touchdown. The alternate landing site at Edwards Air Force Base in California has not been called up for launch support today.
Just before 7 a.m., the crew will begin its formal deorbit preparations and by 8:10 a.m., Endeavour's payload bay doors should be closed in preparation for reentry. The crewmembers will begin climbing into their seats at 9:50 a.m., with a final "go, no go" call from the Entry Flight Director expected about 10:30 a.m. A landing today in Florida would conclude a voyage of more than 4.8 million miles for Endeavour and a 129-day stay in orbit for Culbertson, Dezhurov and Tyurin.