KENNEDY SPACE CENTER, FLA. - Gary King, a test technician, helps test electronic components related to the faulty sensor readings in the liquid hydrogen tank low-level fuel cut-off sensor. The sensor failed a routine prelaunch check during the launch July 13 afternoon, 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).
Album STS-114