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SPACE WATCH – NASA TV
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May 6
NASA – New schedule: No earlier than Monday, May 16, 8:56 a.m. EDT.
The root cause of the failure in the switchbox has not been found, technicians are replacing hardware that could have caused the problem. more> http://tinyurl.com/43yd7ge
May 5, 2011
NASA – Technicians are trying to determine what caused the power box to fail. Initial testing from yesterday shows a driver (circuit) inside the LCA-2 shorted out. The LCA-2 feeds power to heaters on the fuel line for Endeavour’s auxiliary power unit-1 (APU-1). Initially, when the shorted out driver was replaced, the LCA-2 appeared to worked as designed.
Technicians are performing additional failure analysis on the driver today to confirm whether the short experienced by the system came from inside or outside the LCA-2. Depending on the results, additional testing of the box may be required.
May 1, 2011 9:40pm PDT
May 1, 2011 8:14am PDT
[VIDEO 4:04] STS-134 Scrub Explanation
Test results indicate the problem is with a power control box, the aft load control assembly-2 (ALCA-2) in Endeavour’s aft compartment. Teams are working on plans to replace the box or any faulty associated hardware. The launch team currently is backing out of launch countdown operations.
There still are numerous factor to be worked out, but just based on the amount of time needed to do the fix, a new launch attempt wouldn’t happen before the end of the week, at the soonest. more> http://is.gd/psa6cy
April 29, 2011
Launch postponed by at least 72 hours.
NASA – The launch was postponed because of a heater issue associated with the shuttle’s hydraulic power system. The shuttle has three Auxiliary Power Units (APUs) that provide hydraulic power to steer the vehicle during ascent and entry. NASA launch commit criteria and flight rules require all three APUs to be fully operational for launch.
The thermostat that controls the heater didn’t kick on when it was called to do so. The APU heaters that keep the hydrazine fuel from freezing in orbit.
Endeavour’s external fuel tank was drained of more than 500,000 gallons of liquid hydrogen and oxygen so engineers can access the area Saturday and evaluate the issue with APU 1. more> http://twurl.nl/dqapwv
Endeavour on Launch Pad 39A, STS-134
NASA – The space shuttle Endeavour sat on Launch Pad 39A as a storm passed prior to the rollback of the Rotating Service Structure, Thursday, April 28, 2011, at Kennedy Space Center in Cape Canaveral, Fla. Endeavour launches on the STS-134 mission on Friday, April 29 at 3:47 p.m. EDT.
During the 14-day mission, Endeavour and the STS-134 crew will deliver the Alpha Magnetic Spectrometer and spare parts including two S-band communications antennas, a high-pressure gas tank. Image Credit: NASA/Bill Ingalls
NASA Ames to Host Live Broadcast of Endeavor’s Final Launch
MOFFETT FIELD, Calif. — News media and the public are invited to observe a live televised broadcast of space shuttle Endeavour’s launch to the International Space Station at 12:47 p.m. PDT on Friday, April 29, in the Exploration Center at NASA’s Ames Research Center, Moffett Field, Calif. The STS-134 mission is Endeavour’s final scheduled flight and the second to last flight for the Space Shuttle Program. more> http://twurl.nl/bixtff
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