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Four sensors, but one dodgy?



 
 
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  #1  
Old July 15th 05, 10:24 AM
Brian Gaff
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Default 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

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  #2  
Old July 15th 05, 12:05 PM
Bob Haller
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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  
Old July 15th 05, 07:07 PM
Brian Gaff
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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

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Brian Gaff....Note, this account does not accept Bcc: email.
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"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  
Old July 16th 05, 01:03 AM
Rick Nelson
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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  
Old July 21st 05, 10:01 PM
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Default

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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