STORY WRITTEN FOR & USED WITH PERMISSIONPosted: September 6, 2006 @ 2:48 a.m. EDT; Updated at 3:55 a.m. with scrubNASA managers stopped the shuttle Atlantis' countdown early today and put launch on hold for at least 24 hours because of problems with one of the ship's three electricity producing fuel cells.Engineers are continuing to troubleshoot the issue in hopes of getting Atlantis off the ground Thursday or Friday, the end of the current launch window. But if the powerplant has to be replaced, NASA could be forced to haul Atlantis back to its hangar for repairs, a move that would delay launch several weeks.Earlier update from 2:48 a.m.:Engineers at the Kennedy Space Center are troubleshooting a problem with fuel cell No. 1 aboard the shuttle Atlantis. The loading of rocket fuel is on hold and if the problem is not resolved by 4 a.m. or so, today's launch attempt likely will be scrubbed, officials said.The shuttle is equipped with three electricity producing fuel cells that combine oxygen and hydrogen to produce electricity. All three must be operating normally for a countdown to proceed.During powerup early today, a problem showed up in fuel cell No. 1's phase A power bus, one of three power sources within the device. Engineers may shut down and restart the powerplant in a bid to clear the problem or at least understand the unexpected "signature."Launch remains targeted for 12:29 p.m., assuming the fuel cell problem can be resolved by 4 a.m. or so. Updates will be posted here as new information becomes available.Additional coverage for subscribers:VIDEO:TUESDAY'S STATUS UPDATE BRIEFING VIDEORE-LAUNCH NEWS BRIEFING VIDEO:MONDAY'S COUNTDOWN STATUS VIDEO:BIOGRAPHY MOVIE ON THE SIX ASTRONAUTS VIDEO:SHORT MOVIE PREVIEW OF ATLANTIS' MISSION VIDEO:OUTLOOK ON UPCOMING STATION ASSEMBLY FLIGHTS VIDEO:CREW ARRIVES IN T-38 TRAINING JETS VIDEO:COMMENTS FROM CREW AFTER ARRIVAL VIDEO:NEWS BRIEFING ON RETURN TO PAD VIDEO:ATLANTIS ROLLBACK BEGINS VIDEO:OFFICIALS EXPLAIN LIGHTNING SCRUB VIDEO:SEE THE LIGHTNING STRIKE AT PAD B VIDEO:ANOTHER VIEW OF LIGHTNING STRIKE VIDEO:COMPLETE PREVIEW OF ATLANTIS MISSION VIDEOETAILS OF THE THREE SPACEWALKS VIDEO:MEET THE SIX ASTRONAUTS MORE: STS-115 patchThe official crew patch for the STS-115 mission of space shuttle Atlantis to resume orbital construction of the International Space Station.Choose your store: - - - Columbia ReportThe official accident investigation report into the loss of the space shuttle Columbia and its crew of seven. Includes CD-ROM. Choose your store: | | | | 2014 Spaceflight Now Inc.Construction of space station to resume with Atlantis BY WILLIAM HARWOOD
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