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#320
by
rdale
on 23 Aug, 2008 04:50
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During routine inspections of the Space Shuttle's Main Propulsion System (MPS) Liquid Oxygen (LO2) pre-valve, the mechanism provided to maintain the valve in the open position was found cracked. The mechanism is a Vespel roller held against the valve visor by a stack of Belleville springs. The roller has been found cracked 3 times. All three instances were in the same valve in the same location. There are 6 pre-valves on each orbiter, and only one has exhibited this problem. Every-flight inspections were instituted and the rollers were found to be cracked after only one flight. Engineers at Marshall Space Flight Center, Johnson Space Center and Kennedy Space Center worked together to determine a solution. There were several possible contributors to the failure: a mis-aligned visor, an out of specification edge with a sharp radius, an out of specification tolerance stack up of a Belleville spring stack that caused un-predicted loads on the Vespel SP-21 roller, and a dimple machined into the side of the roller to indicate LO2 compatibility that created a stress riser. The detent assembly was removed and replaced with parts that were on the low-side of the tolerance stack up to eliminate the potential for high loads on the detent roller. After one flight, the roller was inspected and showed fewer signs of wear and no cracks.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20080031529_2008030883.pdf
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#321
by
faustod
on 23 Aug, 2008 11:16
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After the rollout of Atlantis yesterday evening, what is the scheduled date for the rollout on Pad 39A, August 29 or August 30?
Will the rollout take place if the issues on Endeavour and ET-129, are not completely resolved?
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#322
by
DaveS
on 23 Aug, 2008 11:28
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Will the rollout take place if the issues on Endeavour and ET-129, are not completely resolved?
Yes. No need to hold up Atlantis.
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#323
by
faustod
on 23 Aug, 2008 11:36
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Will the rollout take place if the issues on Endeavour and ET-129, are not completely resolved?
Yes. No need to hold up Atlantis.
Okay. Thankyou very much.
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#324
by
cb6785
on 23 Aug, 2008 11:40
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After the rollout of Atlantis yesterday evening, what is the scheduled date for the rollout on Pad 39A, August 29 or August 30?
If there are no bigger issues found with mating and stack closeout I guess it should be August 29. But we will know more when the next processing reports come in on L2.
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#325
by
shuttlefan
on 23 Aug, 2008 14:15
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Any word on whether the lifting process has began yet?
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#326
by
rdale
on 23 Aug, 2008 17:08
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Times are listed in L2. Supposedly beginning at 1pm EDT.
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#327
by
gordo
on 24 Aug, 2008 20:25
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NASA PAO are seriously letting themselves down this weekend.
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#328
by
rdale
on 24 Aug, 2008 20:34
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In the grand scheme of NASA operations, moving the shuttle from one building to another really isn't that worthy of front-page headlines...
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#329
by
psloss
on 24 Aug, 2008 20:40
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NASA PAO are seriously letting themselves down this weekend.
There's that little tropical-storm-flooded-most-of-the-area issue, too...I sure hope it's not a typical weekend when the President declares your county a disaster area.
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#330
by
Justin Wheat
on 25 Aug, 2008 14:31
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#331
by
Chris Bergin
on 25 Aug, 2008 16:07
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Mating of both LO2 and LH2 umbilicals complete - few complications, but nothing past the usual.
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#332
by
Chris Bergin
on 25 Aug, 2008 16:08
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Some official times per L2:
Rollover: First motion was at 21:55 EDT.
The orbiter was spotted in the VAB transfer isle at 22:50.
S0004 Orbiter/ET Mate lift from the Orbiter Transporter began Saturday at 0905 with hard mate completed Sunday at 13:55.
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#333
by
psloss
on 25 Aug, 2008 16:13
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#334
by
Ronsmytheiii
on 25 Aug, 2008 16:14
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NASA PAO are seriously letting themselves down this weekend.
There's that little tropical-storm-flooded-most-of-the-area issue, too...I sure hope it's not a typical weekend when the President declares your county a disaster area.
someone was there to take video and pictures of the storm aftermath...
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#335
by
psloss
on 25 Aug, 2008 16:33
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someone was there to take video and pictures of the storm aftermath...
That was shot on August 21, as noted by PAO; probably by folks on the rideout crew...
ITEM 1 - NASA KENNEDY MINIMALLY DAMAGED BY TROPICAL STORM FAY - KSC (REPLAY)
NASA’s Kennedy Space Center, Fla., sustained minimal damage from Tropical Storm Fay. The storm passed over the
center Aug. 20 and then stalled off shore, bringing with it heavy rain and tropical storm force wind.
Based on initial assessments, there was no damage to spaceflight hardware, such as the space shuttles and Hubble
Space Telescope equipment. Some facilities did sustain minor damage, including the Vehicle Assembly Building, which
had a few exterior panels knocked loose. Most reports are of water intrusion that will require mopping up and a few
partly flooded roads and parking lots.
This video was shot on Aug. 21. Kennedy closed Aug. 19 because of Fay and reopened for normal operations Aug. 22.
TRT: 14:06
The point was to be aware that things don't necessarily return to normal immediately in and/or around work.
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#336
by
Chris Bergin
on 25 Aug, 2008 17:16
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NASA PAO are seriously letting themselves down this weekend.
I would note the time she was moved - and that was after the previous deadline, thus was looking like Saturday for a large part of the day. If PAO started at 9am, then they were into a 13-14 hour day by time she was in the VAB. They aren't robots.
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#337
by
Ronsmytheiii
on 25 Aug, 2008 17:27
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NASA PAO are seriously letting themselves down this weekend.
I would note the time she was moved - and that was after the previous deadline, thus was looking like Saturday for a large part of the day. If PAO started at 9am, then they were into a 13-14 hour day by time she was in the VAB. They aren't robots.
Well, if they need anyone to cover in between, all they need is to send me a plane ticket...
Also, does NASA not do the Blue/Gold teams for PAO?
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#338
by
jacqmans
on 25 Aug, 2008 17:28
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#339
by
psloss
on 25 Aug, 2008 18:34
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