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#1
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Four sensors, but one dodgy?
Was this the same problem as with the old tank? was it the same sensor?
It smells like an electronic circuit problem, rather than a sensor one, especially if it can be duplicated. Some mileage might be gained by looking at the history of this sensor and if anything has been altered over the last few tanks. If the hysteresis is caused by electronics, and those electronics are in the sensor, then I suppose either might be some faulty units, but if the electronics are in the orbiter, maybe the answer is to switch around the outputs from the sensors to different processing channels and run a tanking test. Brian -- Brian Gaff....Note, this account does not accept Bcc: email. graphics are great, but the blind can't hear them Email: __________________________________________________ __________________________________________________ __________ |
#2
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a good question, did they remove and test the first tanks sensors?
if they failed to do so it shows columbia hasnt taught them much... |
#3
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Only how to waste a lot of time and money having to do it later on.
They did scrub the launch. when I was in QA, if something dodgy came up, we would check all similar items in whatever state of assembly they were. It saved money. Brian -- Brian Gaff....Note, this account does not accept Bcc: email. graphics are great, but the blind can't hear them Email: __________________________________________________ __________________________________________________ __________ "Bob Haller" wrote in message oups.com... a good question, did they remove and test the first tanks sensors? if they failed to do so it shows columbia hasnt taught them much... |
#4
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I believe it is a cover-up for larger issues.
And I know what the problem is on the lower liguid hydrogen tank sensors. It is an analog to digital computational problem on the old A/D chips they are using to feed the newer diagnostic computers. Essentially, it's an interface problem based on the old EPROM drivers of the old A/D devices. They should have replaced the whole system of temperature gauging devices in the ET.. But that Alabama Senator.. What's his name? Has blood on his hands. And so it goes, Rick Brian Gaff wrote: Was this the same problem as with the old tank? was it the same sensor? It smells like an electronic circuit problem, rather than a sensor one, especially if it can be duplicated. Some mileage might be gained by looking at the history of this sensor and if anything has been altered over the last few tanks. If the hysteresis is caused by electronics, and those electronics are in the sensor, then I suppose either might be some faulty units, but if the electronics are in the orbiter, maybe the answer is to switch around the outputs from the sensors to different processing channels and run a tanking test. Brian |
#5
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Well... It's also possible that they just don't want to launch the
whole thing (political reason?) so they probably use every technical reason they could think of, rainging from weather to fuel sensors. |
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