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Author
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Topic: Launch Scrub
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spacegrl13
Member Posts: 122
From: Portland, Oregon, U.S.
Registered: Aug 2002
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posted 07-13-2005 12:45 PM
   
If the shuttle can't fly today does anyone know when it would be slated to fly next or how long it would take to fix the particular problem.
cheers,
Helen
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zee_aladdin
Member Posts: 781
From: California
Registered: Oct 2004
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posted 07-13-2005 12:52 PM
The shuttle launch has been scrubbed while I was switching channels between the NASA channel and A&E Star Wars 'Empire of Dreams' (the making of Star Wars).... very interesting watching science fiction and real science.I did make a comment that the shuttle should not fly on the 13th ... was a coincidence or something else. Now one will ever know. I hope the Shuttle flies very soon ... I CANT WAIT  |
michaelSN99
Member Posts: 153
From: heilbronn,germany
Registered: Apr 2005
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posted 07-13-2005 01:07 PM
helen,the problem with the fuel sensor cannot be investigated od even fixed with propellants in the tanks, wich have to be drained first. so there is no idea how long the launch delay will be , at this time. ------------------
michael may www.ag-99.de/spacenet/main/main.html |
Robert Pearlman
Editor Posts: 42986
From: Houston, TX
Registered: Nov 1999
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posted 07-13-2005 01:08 PM
The failure was with the LH2 ECO Sensor #2. The sensors presently shows 'WET' with the tank full. At ~L-3 hours, a test command is sent to transition the sensors from WET to DRY to check the sensors out. Sensor #2 failed to transition to DRY. This is in violation of the launch criteria (basically, we are NO GO if there is anything anomalous with these sensors, failed hard, intermittent or transient). |
Madon_space
Member Posts: 667
From: uk
Registered: Sep 2002
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posted 07-13-2005 01:10 PM
Very Very disappointing but as always safety of the crew must come first, can't imagine how the whole Nasa Team must feel in situations like this.Maybe tomorrow ------------------
Best Wishes
ROB
http://hometown.aol.com/robc2412/madonspace.html |
Dwight
Member Posts: 576
From: Germany
Registered: Dec 2003
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posted 07-13-2005 01:19 PM
Bummer...well I didn't dispair, as I took out the Apollo 17 DVD and watched that launch instead, albeit with a significant delay...Here's hoping a laaunch of STS114 happens soon!!! Dwight |
Robert Pearlman
Editor Posts: 42986
From: Houston, TX
Registered: Nov 1999
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posted 07-13-2005 01:22 PM
The crew has left the vehicle and are on their way back to their quarters. Depending on the preliminary findings of the trouble shooting teams, the crew may stay in Florida or choose to return to Houston until such time another launch attempt can be made.A press conference has been called for no earlier than 4:30pm EDT depending on what information is known at that time. |
zee_aladdin
Member Posts: 781
From: California
Registered: Oct 2004
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posted 07-13-2005 01:22 PM
Thanx for the detailed info, Robert. Anything that has to do with FUEL is always a critical issue. |
zee_aladdin
Member Posts: 781
From: California
Registered: Oct 2004
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posted 07-13-2005 01:27 PM
I am now watching the 60 minutes documentary of the last Columbia crew on the Science Channel, and all the training they had to go through. |
michaelSN99
Member Posts: 153
From: heilbronn,germany
Registered: Apr 2005
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posted 07-13-2005 01:29 PM
additional a statement by Dave Wolf explaining how the questionable sensor works and why its critical during the sacent of the shuttle:"We really don't want the engine to be running at high speed and suddenly run out of fuel. That can lead to a devastating breakdown of the engine, even uncontained failure of the engine if that should happen. Therefore, we have four sensors on the vehicle and it requires two of those to detect a low-level fuel in order to cut off the engines early before they would run out. This only comes into play in special conditions on the ascent, not a nominal ascent, so it's essentially a backup for a backup situation.
Even though the odds of needing this sensor are low, very low, in the proper spirit of safety to any really feasible or projectable failure we want a full system, certainly at the point of launch." source: spaceflightnow ------------------
michael may www.ag-99.de/spacenet/main/main.html |
John McGauley
Member Posts: 151
From: Fort Wayne, Indiana USA
Registered: May 2001
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posted 07-13-2005 02:29 PM
This sounds just like the issue that caused the rollback and tank switch. Anyone know if that's the case? If so, certainly makes one want to question to decision not to do a tanking test on this new one. |
michaelSN99
Member Posts: 153
From: heilbronn,germany
Registered: Apr 2005
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posted 07-13-2005 02:39 PM
John,some more informations and much more questions you can read in another posting here ;-) :
http://collectspace.com/ubb/Forum30/HTML/000165.html ------------------
michael may www.ag-99.de/spacenet/main/main.html |
november25
Member Posts: 646
From: Douglas, Isle of Man, UK
Registered: Feb 2004
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posted 07-13-2005 05:12 PM
Its a very great shame about the fuel sensor. The same goes-for when I fly a plane. if I see a Red Light,indicating a
Malfunction on the instrument panel-then I would scub take off- T his is why the same applies to the Space Shuttle instruments-once a pre-flight check has been made,and this is indicated-then No Way-its a go-unless an electrical fault-My Quote on safety- [I WILL NOT FLY THE PLANE-if there is a red light-} BETTER TO BE SAFE-THEN SORRY-after take off.
I expect other pilots on cs board will agree.
All the best to the ST S114 team-better luck next time.
regards from Brenda.
this was posted by november25. |
lb206
Member Posts: 48
From:
Registered: Jul 2005
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posted 07-13-2005 09:09 PM
Well the flight is scheduled for no earlier than Saturday we will know more tommorow afternoon after they drain the tank and look at the situation from there tonight and tommorow morning. They said they should have some idea of the work involved by tommorow afternoon and whether or not it will require another rollback and scrub till september. |
HouseDadX4
unregistered
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posted 07-15-2005 09:46 AM
Looks as though an attempt on Sunday is a No-Go..This story is posted at Florida Today.comDiscovery tanks drained; no try Sunday Sensor trouble may take weeks to locate, repair BY TODD HALVORSON
and CHRIS KRIDLER CAPE CANAVERAL - NASA engineers drained the tanks onboard Discovery that hold liquid hydrogen and liquid oxygen for the shuttle's fuel cell system early today, a move that means the agency will not be making a launch attempt Sunday. We expect an announcement later today on what the new earliest possible launch date is for the first mission since Columbia. The fuel cell system generates electricity to power all spaceship systems during flight. The tanks are located beneath the lining of the shuttle's 60-foot-long cargo bay. Mission managers had said Thursday that it was unlikely engineers would be able to find and fix a problem with fuel gauges in the shuttle's external tank in time to launch Sunday. The off-loading of liquid hydrogen and liquid oxygen from the fuel cell tanks, meanwhile, puts NASA in a position where the agency would not be able to complete all work necessary to have Discovery ready to launch on Sunday. Engineers are meeting at Kennedy Space Center now to plot out a fuel gauge troubleshooting plan. A technical review of the plan is scheduled for 12:30 p.m. The Mission Management Team will meet at 3:30 p.m. to decide on a course of action. A news conference will be held after the management team meeting. |
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