Mission Control has revised the timeline for Atlantis’ crew, moving it 30 minutes earlier beginning with the planned "campout" for spacewalkers Steve Bowen and Michael Good. The schedule change will allow the spacewalkers time to release the snagged portion of the cable on the camera used for imaging the space shuttle’s heat shield. The camera is at the end of the Orbiter Boom Sensor System.
The campout now will begin at 4:45 p.m. EDT, and crew sleep will begin at 6:20 p.m. On May 19, the crew will wake up at 2:20 a.m. and begin the spacewalk at 7:15 a.m.
Bowen and Good will camp out in the station’s Quest airlock at a reduced air pressure, a procedure that helps purge nitrogen from their bloodstreams and prevents the “bends” when they exit the airlock.