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The glitch appeared the Tuesday evening, as techniciansResilient Seated Gate Valves filled the shuttle's external tank with liquid hydrogen and liquid oxygen. The valve in question governs filling and draining of the tank holding liquid hydrogen. It's role is critical enough to require a scrub if it appears to be malfunctioning. The valve problem cropped up as technicians were moving into the final stages of filling the shuttle's external tank. The valve was supposed to close, but engineers received no direct confirmation that it had shut from sensors designed to alert them to the valve's status. There are actually two of these valves along the plumbing that lead to the hydrogen tank – one valve backs up the other. If one fails to close at the end of the fill up, the second will keep the tank closed. Problems arise if one of the valves fails to open again. Flight controllers sometimes need to drain the tank in a hurry – for instance, when they have to abort a launch. With the valves open, the tanks can drain in about two hours. Without them, it can take several days for the liquid hydrogen to boil away naturally. During Tuesday evening's fill up, the launch team received other, less direct, evidence that the valve had shut, says Mike Moses, who heads the prelaunch missionAutomatic Control Valves management team. That suggested that the problem involved the sensors and not the valve itself. But strict launch requirements on this component and the approaches to troubleshooting it prevent the mission from proceeding unless the valve is confirmed to be in working order. NASA developed the strict guidelines after the agency experienced problems with similar valves on two previous missions. In order to figure out what went wrong, technicians are required to drain the super-cold fuel and allow the valves to return to warmer temperatures before they can inspect the system. The delay, currently envisioned to last 48 hours, has sent astronauts back into their prelaunch quarantine quarters and their relatives and guests back to motels. Depending on the diagnosis engineers develop, Discovery could launch at 12:22 a.m. Eastern time Friday, with a second attempt possible some 23 hours later. Weather forecasters are now watching tropical storm Danny to see if it could lead to weather-related delays. If those two opportunities are scrubbed, NASA can launch Aug. 30. After that, other launch schedules for Cape Canaveral as well as Russian and Japanese cargo traffic around the space station would push Butterfly Valves a launch to mid-October. Moreover, if the sensors are the problem, managers could still scratch the launch this weekend if they are too uncomfortable with the prospect of relying on indirect evidence that the valve is behaving properly. The mission management team could opt to stand down for repairs.
原文来自： http://www.csmonitor.com/USA/2009/0826/p02s05-usgn.html

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译文：针对阀门的诊断工作
阀门出现了问题，作为技术人员将填补航天飞机的外部燃料箱的最后阶段前进。本来阀门关闭，但没有收到任何直接的工程师证实，它已经从旨在提醒他们阀门关闭状态传感器。实际上有两种管道沿线的这些阀门导致的氢气罐 - 1了其他阀门背。如果不关闭在填补结束，第二个将保留坦克封闭。如果出现问题的一个阀门无法打开了。飞行控制有时需要排急于 - 例如，坦克当他们中止发射。随着阀门打开，坦克可以消耗约两小时。如果没有这些，它可以采取液氢几天的汽化自然。在周二晚上的填补，发射队获得其他非直接的证据表明，该阀门已关闭，迈克说摩西，谁负责的发射前的使命管理团队。这表明，所涉及的问题，而不是传感器本身的阀门。但是，在这部分的严格要求和发射的故障排除它避免因诉讼任务，除非被确认阀在工作状态的方法。美国航天局开发机构后，经历了严格的指导方针与前两个特派团的类似阀门的问题。为了找出什么地方出了错，技术人员必须抽干超低温燃料，并允许阀门回到气温才可以检查系统。延迟，目前的设想，以过去48个小时，已经把宇航员送入回到宿舍的发射前检疫和他们的亲属和嘉宾回到汽车旅馆。根据工程师开发的诊断，发现可以在上午12时22分发射东部时间周五公布，第二次尝试可能的约23小时后。气象预报都在拭目以待热带风暴丹尼，看看它是否会导致与天气有关的延误。如果这两个机会擦洗，美国宇航局8月30日才能发射。在此之后，其他的卡纳维拉尔角发射时间表以及俄罗斯和周围的空间站日本货运量将推动发射到10月中旬。此外，如果传感器的问题，管理人员还可以从头开始推出这个周末如果它们太关于依靠间接证据的前景感到不安的阀门表现正常。特派团的管理团队可以选择站修理了。

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