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#460
by
dsmillman
on 06 Jun, 2007 17:54
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#461
by
psloss
on 06 Jun, 2007 17:59
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TFGQ - 6/6/2007 1:54 PM
i know a person in the newsroom they informed me about this
Definitely a head-scratcher without details...
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#462
by
TFGQ
on 06 Jun, 2007 18:11
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i am not getting a reason why eithier
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#463
by
TFGQ
on 06 Jun, 2007 18:27
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because of the disconnect evaluations
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#464
by
dotdk
on 06 Jun, 2007 18:38
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What is the MPS and what is the disconnect issue?
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#465
by
psloss
on 06 Jun, 2007 18:45
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dotdk - 6/6/2007 2:38 PM
What is the MPS and what is the disconnect issue?
MPS is the
Main Propulsion SystemBill Harwood did a summary of the issue this morning:
http://www.cbsnews.com/network/news/space/current.htmlExcerpt from "SR-19 (06/06/07): Countdown underway; weather still 70 percent 'go'":
The only technical issue under discussion involves 2-inch and 4-inch hydrogen pressurization lines on the external tank that will be used by shuttle Endeavour in August that are very slightly - a few ten-thousandths of an inch - out of spec. NASA managers are re-evaluating the results of 400-psi leak checks done after Atlantis' tank was mated with the shuttle to make sure the lines in question are properly seated.
Some engineers have suggested an additional 600-psi leak test to double-check the connections, work in Atlantis' engine compartment that would delay launch three days or so. But given the results of the earlier tests - and normal checks during the fueling process Friday - it appears likely NASA managers will press ahead with the countdown for a launch attempt at 7:38 p.m. Friday.
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#466
by
DaveS
on 06 Jun, 2007 18:47
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#467
by
Peter NASA
on 06 Jun, 2007 19:17
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Management chatter on the issue is being placed into L2.
Could be a delay to launch coming.
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#468
by
Chris Bergin
on 06 Jun, 2007 19:28
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GO FOR LAUNCH. Friday is ON. Dissenting opinion on Disconnects is retracted (rationalized).
(Thanks to the source on L2).
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#469
by
Lee Jay
on 06 Jun, 2007 19:30
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I don't understand this. If the ones on STS-117 are within spec, and if they passed pressure check, what difference does it make *to this mission* if other disconnects on another tank are out of spec?
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#470
by
Namechange User
on 06 Jun, 2007 19:34
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It was a concern by some engineers in the community. In their opinion, since the root cause had not been specifically identified on ET 117 the condition could exist on ET 124 and therefore a cause for concern, regardless of the leak and helium signature checks.
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#471
by
Lee Jay
on 06 Jun, 2007 19:39
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Were these same measurements not collected for the couplings on ET-124/STS-117?
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#472
by
jacqmans
on 06 Jun, 2007 19:40
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Mission: STS-117 - 21st International Space Station Flight (13A) -
S3/S4 Truss Segment Solar Arrays
Vehicle: Atlantis (OV-104)
Location: Launch Pad 39A
Launch Date: June 8, 2007
Crew: Sturckow, Archambault, Reilly, Swanson, Forrester, Olivas and
Anderson
Inclination/Orbit Altitude: 51.6 degrees/122 nautical miles
The countdown for the launch of space shuttle mission STS-117 began as
planned Tuesday at 9 p.m. EDT, when clocks in the Launch Control
Center began counting backward from the T-43 hour mark. Launch is
scheduled for 7:38 p.m. EDT Friday.
Atlantis' astronauts arrived at Kennedy Space Center Monday evening
and have been practicing landings in the Shuttle Training Aircraft,
conducting fit checks of their launch-and-entry suits, reviewing
their timelines and undergoing medical exams.
Launch preparations continue as planned. Following a four-hour
built-in hold at the T-27 hour mark, the countdown resumes at 6:30
p.m. EDT today. Transfer of the hydrogen and oxygen reactants will
then begin. These will flow through the orbiter mid-body umbilical
unit into the power reactant storage and distribution system tanks
located beneath the payload bay. These reactants will be used by
Atlantis to generate power during the mission. The umbilical unit
will be secured once this loading is complete at about 1 a.m. EDT
Thursday, when the countdown enters a hold at the T-19 hour mark.
There is a 30-percent chance that conditions will not meet the weather
criteria for launch Friday. The main concern is thunderstorms with
associated anvil clouds.
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#473
by
Flightstar
on 06 Jun, 2007 19:43
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The leak checks went without issue, so it would have been a tough call to hold this launch back.
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#474
by
Namechange User
on 06 Jun, 2007 19:46
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Lee Jay - 6/6/2007 2:39 PM
Were these same measurements not collected for the couplings on ET-124/STS-117?
They were. However ET 124 was mated to OV-104 at one point in 2003 just prior to the loss of 102. They were remeasured afterward and out of spec. However, we had never done this before and are not 100% sure of the effect on these tolerances after a mate/de-mate cycle.
Although never measured, we have destacked and restacked an orbiter and ET several times before in the past. Every time, we got the expected performance in mating ops, pad ops (leak checks, helium sigs, etc) and flight.
This isn't really a big deal. These dissenting/alternate opinions happen many times a day or during any given vehicle flow. This is why those on here say management supresses alternate opinions are just not correct.
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#475
by
psloss
on 06 Jun, 2007 19:48
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Launch preparations continue as planned. Following a four-hour
built-in hold at the T-27 hour mark, the countdown resumes at 6:30
p.m. EDT today.
Sounds like "lost in translation issue," as this press release misplaced 90 minutes.
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#476
by
DaveS
on 06 Jun, 2007 19:50
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OV-106 - 6/6/2007 9:46 PM
They were. However ET 124 was mated to OV-104 at one point in 2003 just prior to the loss of 102.
Don't you mean ET-117? A stand-up report on L2 mentioned that 104 was mated to ET-117 prior to the loss of 102. I'm just trying not be confused!
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#477
by
Namechange User
on 06 Jun, 2007 19:53
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I do, we've all been tripping up on that now and then during the discussions about this issue over the last several days. OV-104 is mated to ET 124 for STS-117. OV-104 was mated to ET-117 back in 2003.
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#478
by
psloss
on 06 Jun, 2007 19:54
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Chris Bergin - 6/6/2007 3:28 PM
(Thanks to the source on L2).
I second that.
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#479
by
shuttlepilot
on 06 Jun, 2007 19:56
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L-2 Launch Readiness News Conference should begin in 5 minutes. (NASA TV Media Channel)