KSC-05pd-1564

KENNEDY SPACE CENTER, FLA. - Under evening cloud-filled skies, Space Shuttle Discovery remains on the pad two days after the Shuttle’s launch on Return to Flight mission STS-114 was scrubbed. The July 13 mission was scrubbed when a low-level fuel cut-off sensor for the liquid hydrogen tank inside the External Tank failed a routine prelaunch check during the countdown July 13, causing mission managers to scrub Discovery's first launch attempt. The sensor protects the Shuttle's main engines by triggering their shutdown in the event fuel runs unexpectedly low. The sensor is one of four inside the liquid hydrogen section of the External Tank (ET).