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#680
by
psloss
on 23 Sep, 2008 13:49
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Very nice article, Chris. Can someone briefly expand on what an Ascent String is, in the context of an Ascent String Reassignment/restring? I'm just not familiar with the term. thanks.
There's a copy of generic flight rules available here (note that it's circa 2002):
http://www.jsc.nasa.gov/news/columbia/fr_generic.pdfAscent string reassignment is discussed on page 568 of the PDF; section A2-63 in the document.
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#681
by
dcbecker
on 23 Sep, 2008 15:16
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Very nice article, Chris. Can someone briefly expand on what an Ascent String is, in the context of an Ascent String Reassignment/restring? I'm just not familiar with the term. thanks.
There's a copy of generic flight rules available here (note that it's circa 2002):
http://www.jsc.nasa.gov/news/columbia/fr_generic.pdf
Ascent string reassignment is discussed on page 568 of the PDF; section A2-63 in the document.
sorry, my question was much more basic than that. what is a string? a particular set of guidance/control elements that are picked from a larger set of redundant elements, such that you have a complete working set to achieve operational capabilities? and per the flight rules, restringing is done when there is a failure in an operational "string" of control elements, so that you regain the complete control (minus the loss of redundancy?)
Dan
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#682
by
psloss
on 23 Sep, 2008 16:08
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sorry, my question was much more basic than that. what is a string? a particular set of guidance/control elements that are picked from a larger set of redundant elements, such that you have a complete working set to achieve operational capabilities? and per the flight rules, restringing is done when there is a failure in an operational "string" of control elements, so that you regain the complete control (minus the loss of redundancy?)
(Probably should migrate to Q & A section...)
Here's one reference:
http://spaceflight.nasa.gov/shuttle/reference/shutref/orbiter/avionics/dps/databus.htmlFlight-critical buses tie the GPCs to flight-critical MDMs, display driver units, head-up displays, main engine interface units and master events controllers. These buses are directed into groups of four compatible with the grouping of four PASS GPCs. Four of these buses-FC1, 2, 3 and 4-connect the GPCs with the four flight-critical forward MDMs, the four aft flight-critical MDMs, the three DDUs and the two HUDs. The other four flight-critical buses-FC5, 6, 7 and 8-connect the GPCs to four forward MDMs, the four aft MDMs, the two mission events controllers and the three main engine interface units. The specific manner in which these units interface is referred to as a string. A string is composed of two flight-critical data buses-one from the first group (FC1, 2, 3 or 4) and one from the second group (FC5, 6, 7 or 8 ).
(I added the emphasis.)
Another reference that I thought was interesting, "Googling" around :
http://klabs.org/DEI/Processor/shuttle/sp-504/section_3/section_3_drivers_requirements.htm
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#683
by
Ronsmytheiii
on 23 Sep, 2008 16:55
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#684
by
Chris Bergin
on 23 Sep, 2008 21:25
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Looking like a three day slip to the launch date at the moment, per meetings today. (Oct 12 late at night)
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#685
by
chezbippy12
on 23 Sep, 2008 22:04
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Thats the best new I have heard all week. Thanks Chris. I will wait for your official Announcement .
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#686
by
C5C6
on 23 Sep, 2008 23:55
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I've only seen ISS payload processing up to this mission (became enthusiast in STS-121), about all the contamination preventions that are being considered...is there any documentation about levels of payload contamination acceptance according to payload function?? Its not the same for the HST compared with the ISS components...what about satellites, or the LDEF, or Spacehab...
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#687
by
Chris Bergin
on 24 Sep, 2008 15:23
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Looking at a five day slip to STS-125 (Evening of October 14). Article shortly.
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#688
by
grafgulch
on 24 Sep, 2008 16:23
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Ouch!!! Nothing like being a newbie & making my reservations early.
live 'n learn.
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#689
by
Chris Bergin
on 24 Sep, 2008 16:47
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#690
by
dsmillman
on 24 Sep, 2008 17:48
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#691
by
mark147
on 24 Sep, 2008 19:24
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That link states a date of Nov 16 for STS-126 but by my reckoning that pushes the STS-126 docked period into the beta angle cutout by a couple of days. Is this therefore likely to push STS-126 into next year or are they looking at other options?
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#692
by
rdale
on 24 Sep, 2008 19:32
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Beta angle cutout is listed based on launch date.
(STS126 questions should probably go in the STS126 thread in the future
)
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#693
by
ShuttleDiscovery
on 24 Sep, 2008 19:32
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The STS-125 delay is okay, but as for STS-126....
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#694
by
Stowbridge
on 24 Sep, 2008 23:03
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#695
by
Chris Bergin
on 25 Sep, 2008 10:32
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Thanks Stowbridge. All thanks to the sources/L2 etc, rather than me.
Large set of articles via FRR will be published in the coming days...as we launch the new news site in about 24/48 hours.
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#696
by
francoisvalenduc
on 25 Sep, 2008 16:31
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Usually, the crew inspect the payload bay during the TCDT. It seems it didn't happen for this mission because of the problem encountered during the transfer to the payload changeout room.
Will this activity occur later or is not absolutely required ?
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#697
by
ShuttleDiscovery
on 25 Sep, 2008 16:44
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Usually, the crew inspect the payload bay during the TCDT. It seems it didn't happen for this mission because of the problem encountered during the transfer to the payload changeout room.
Will this activity occur later or is not absolutely required ?
I don't think it's required, as the crew obviously knows where everything is in the payload bay! I supose it just helps for EVAs seeing the payload bay and all the equipment...
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#698
by
Jim
on 25 Sep, 2008 18:07
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Usually, the crew inspect the payload bay during the TCDT. It seems it didn't happen for this mission because of the problem encountered during the transfer to the payload changeout room.
Will this activity occur later or is not absolutely required ?
The crew walked down the payloads and payload bay during CEIT in the PHSF ands OPF
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#699
by
mkirk
on 25 Sep, 2008 23:52
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Usually, the crew inspect the payload bay during the TCDT. It seems it didn't happen for this mission because of the problem encountered during the transfer to the payload changeout room.
Will this activity occur later or is not absolutely required ?
The crew walked down the payloads and payload bay during CEIT in the PHSF ands OPF
I beleive they will get a chance to do a walkdown and sharp edge inspection after they arrive at KSC for the start of the Launch Count. Final payload bay door closure is currently scheduled for that time frame.
Mark Kirkman
)