 The Spaceflight Meteorology Group at Johnson Space Center was predicting less than favorable weather for Friday's landing, so managers asked the crew to power down some non-critical systems to help conserve power, in the event that the orbiter is not able to land until Saturday.After evaluating the imagery sent down from the late inspection, the ground team officially cleared the orbiter's thermal protection system for re-entry.Initially, NASA had planned on releasing "Endeavour" from its stand-by status following the late inspection, but managers on the ground decided to wait until "Atlantis" had performed the de-orbit burn before standing down the STS-400 rescue mission officially.