A worker prepares to remove the quick disconnect and flight seal on space shuttle Endeavour's external fuel tank.

On Launch Pad 39A at NASA's Kennedy Space Center in Florida, a worker prepares to remove the 7-inch quick disconnect and flight seal from the Ground Umbilical Carrier Plate, or GUCP, on space shuttle Endeavour's external fuel tank. Teams are removing the hardware to change out seals in the internal connection points. A leak of hydrogen at the location during tanking June 12 for the STS-127 mission caused the mission to be scrubbed at 12:26 a.m. June 13. The GUCP is the overboard vent to the pad and the flare stack where the vented hydrogen is burned off. Endeavour is scheduled to launch on its STS-127 mission on June 17 at 5:40 a.m. EDT. Photo credit: NASA/Tim Jacobs