Technicians completed checks of the Ground Umbilical Carrier Plate and the solid rocket boosters aft skirt purge at Launch Pad 39A as space shuttle Discovery is readied for launch on STS-133. Today's tests include a helium signature evaluation and teams will check the space shuttle main engine ball valve for leaks. STS-133 Commander Steve Lindsey and Pilot Eric Boe will fly to Kennedy today to conduct practice landings in a shuttle training aircraft, or STA. Discovery is targeted to launch Nov. 1 at 4:40 p.m. on a mission to take supplies and equipment to the International Space Station.