At NASA Kennedy Space Center's Launch Pad 39A removes a cover to provide access for the removal and replacement of the Load Control Assembly-2 LCA-2.

At NASA Kennedy Space Center's Launch Pad 39A, a worker inside space shuttle Endeavour's aft section removes a cover to provide access for the removal and replacement of the Load Control Assembly-2 (LCA-2).

Located in the orbiter's aft avionics bay 5, the LCA-2 assembly, which feeds power to the fuel line heaters, is believed to have caused the heaters for Endeavour's auxiliary power unit-1 (APU-1) to fail April 29 during the first launch attempt for the STS-134 mission. STS-134 will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. The mission also will be the final spaceflight for Endeavour. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Kim Shiflett.