CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Launch Pad 39A, the Load Control Assembly-2 (LCA-2) is removed from inside space shuttle Endeavour's aft section. 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. The assembly will be replaced and systems will be retested before the launch is rescheduled. 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/Troy Cryder

CAPE CANAVERAL, Fla. --The Load Control Assembly-2 (LCA-2) is outside at NASA Kennedy Space Center's Launch Pad 39A after it was removed from inside space shuttle Endeavour's aft section. 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. The assembly will be replaced and systems will be retested before the launch is rescheduled. 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/Troy Cryder

CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Launch Pad 39A, technicians carry away the Load Control Assembly-2 (LCA-2) after it was removed from inside space shuttle Endeavour's aft section. 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. The assembly will be replaced and systems will be retested before the launch is rescheduled. 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/Troy Cryder

CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Launch Pad 39A, technicians work to remove the Load Control Assembly-2 (LCA-2) from inside space shuttle Endeavour's aft section. 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. The assembly will be replaced and systems will be retested before the launch is rescheduled. 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/Troy Cryder

CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Launch Pad 39A, technicians begin to remove the Load Control Assembly-2 (LCA-2) from inside space shuttle Endeavour's aft section. 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. The assembly will be replaced and systems will be retested before the launch is rescheduled. 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/Troy Cryder

CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Launch Pad 39A, technicians use a borescope to inspect wiring after installing a new aft load control assembly (ALCA-2) in the aft compartment of space shuttle Endeavour. The ALCA-2, which feeds power to the fuel line heaters, 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. The assembly was replaced and systems will be retested before the next launch attempt, which now is no earlier than May 16 at 8:56 a.m. EDT. 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 will be the final spaceflight for Endeavour. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- The Load Control Assembly-2 (LCA-2) is outside at NASA Kennedy Space Center's Launch Pad 39A after it was removed from inside space shuttle Endeavour's aft section. 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. The assembly will be replaced and systems will be retested before the launch is rescheduled. 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/Troy Cryder

CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Launch Pad 39A, technicians use a borescope to inspect wiring after installing a new aft load control assembly (ALCA-2) in the aft compartment of space shuttle Endeavour. The ALCA-2, which feeds power to the fuel line heaters, 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. The assembly was replaced and systems will be retested before the next launch attempt, which now is no earlier than May 16 at 8:56 a.m. EDT. 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 will be the final spaceflight for Endeavour. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Launch Pad 39A, the Load Control Assembly-2 (LCA-2) is removed from inside space shuttle Endeavour's aft section. 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. The assembly will be replaced and systems will be retested before the launch is rescheduled. 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/Troy Cryder

CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Launch Pad 39A, technicians use a borescope to inspect wiring after installing a new aft load control assembly (ALCA-2) in the aft compartment of space shuttle Endeavour. The ALCA-2, which feeds power to the fuel line heaters, 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. The assembly was replaced and systems will be retested before the next launch attempt, which now is no earlier than May 16 at 8:56 a.m. EDT. 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 will be the final spaceflight for Endeavour. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Jim Grossmann

CAPE CANAVERAL, Fla. -- At NASA Kennedy Space Center's Launch Pad 39A, the Load Control Assembly-2 (LCA-2) is removed from inside space shuttle Endeavour's aft section. 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. The assembly will be replaced and systems will be retested before the launch is rescheduled. 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/Troy Cryder