Seals responsible for a hydrogen leak

2009-06-14 – Seen in the photo is the Ground Umbilical Carrier Plate, or GUCP, on Space Shuttle Endeavour's external fuel tank. Technicians have started to change out the seals responsible for a hydrogen leak that was discovered during tanking on June 12 and that caused the STS-127 mission to be scrubbed at 12:26 a.m. EDT on June 13. (Credit: NASA/Tim Jacobs)