SCRUB: STS-115: Launch Day - September 8

• #360 by DaveS on 08 Sep, 2006 19:35
• Quote

  Mark Nguyen - 8/9/2006  9:19 PM
  
  And has anyone heard anything on the fuel cell of late?
  
  Mark

  FC#1 operated nominally throughout the countdown. No problems noted on it when the scrub was called during T-9 minute hold.
• #361 by dbhyslop on 08 Sep, 2006 19:36
• Quote

  astrobrian - 8/9/2006  2:34 PM
  
  Wayne Hale made a comment the other day about having enough clean articles of clothing to go through the entire launch window, Saturday was originally out of the window so his manifest is going to need a recharge hehe

  
  We could have a pair of underwear and socks delivered to him with a card, "Re: 09/06/06 MMT press briefing, courtesy of NASAspaceflight.com"
• #362 by strut on 08 Sep, 2006 20:11
• Okay everybody is worried about WH UW, Wayne is going to have to wait behind me for the washing machine
• #363 by Chris Bergin on 08 Sep, 2006 20:49
• Quote

  DaveS - 8/9/2006  8:12 PM
  
  Chris, could you check with your ET sources what the status of the ECO sensors are now that they have drained the ET?
  
  If they all went "dry" when the ET was drained it would indicate that they do have a good set of sensors and that they can proceed with a launch tommorow if LH2 sensor#3 would fail "wet" again.

  
  They all started work in the early hours, so no one is around who worked on the tank for this launch. Seeing what I can find out from KSC.
• #364 by DaveS on 08 Sep, 2006 20:52
• Quote

  Chris Bergin - 8/9/2006  10:36 PM
  They all started work in the early hours, so no one is around who worked on the tank for this launch. Seeing what I can find out from KSC.

  Thanks. I just hope that we will either see the same failure tommorow or 4 working sensors.
• #365 by psloss on 08 Sep, 2006 20:58
• FWIW, Bill Harwood's latest update ("04:00 p.m., 09/08/06, Update: Launch delayed by ECO sensor failure; Hale says team made right decision") says LH2 ECO #3 continued to show wet during drain after the other three went dry "as expected":
  http://www.cbsnews.com/network/news/space/current.html
  
• #366 by Chris Bergin on 08 Sep, 2006 21:07
• Good. That saves a search and a half. Also I'll be able to write my Sat launch preview article with basis on the ECO troubleshoot document we've got on L2.
  
  Remember, we don't - via sources - think it's the sensor, we think it's wiring between the PSB and the sensor....but excluding it and bringing in the 3/4 LCC as per troubleshoot is at least hopeful for tomorrow.
• #367 by DaveS on 08 Sep, 2006 21:07
• Well that answers my question. Same behaviour as after the first scrub of STS-114, but different LH2 sensor. I wonder if this was an expected behaviour?
• #368 by Chris Bergin on 08 Sep, 2006 21:36
• Ironic image from Sky News TV (the best Shuttle coverage by mass media by far)
  
  

  ---

  
• #369 by DaveS on 08 Sep, 2006 21:40
• Well, I don't think they're going to do any RSS operations. Those are generally done during the T-11 hold which ends in about an hour.
• #370 by rdale on 08 Sep, 2006 21:40
• "I wonder if this was an expected behaviour?"
  
  Is your question -- Did they expect this sensor to fail? Of course not.
• #371 by DaveS on 08 Sep, 2006 21:42
• Quote

  rdale - 8/9/2006  11:27 PM
  
  "I wonder if this was an expected behaviour?"
  
  Is your question -- Did they expect this sensor to fail? Of course not.

  Not the question. Question was in reponse to that sensor#3 remained "wet" even after draining operations.
• #372 by psloss on 08 Sep, 2006 21:50
• Quote

  Chris Bergin - 8/9/2006  4:54 PM
  
  Remember, we don't - via sources - think it's the sensor, we think it's wiring between the PSB and the sensor....but excluding it and bringing in the 3/4 LCC as per troubleshoot is at least hopeful for tomorrow.

  Assuming I heard it correctly, I thought one of the interesting comments from the briefing relating to this was what Leroy Cain said about the theory that cryogenic conditions are a factor in this behavior and that the timing of the initial failure pointed to one side of the monoball versus the other...
  
• #373 by Avron on 08 Sep, 2006 21:52
• David
  
  Do you have a time for comming out of the T-11 hold?
• #374 by DaveS on 08 Sep, 2006 21:56
• 6:25 pm EDT(2225 UTC).
• #375 by psloss on 08 Sep, 2006 22:10
• Here's how I have it -- all EDT -- based on a target T-0 of 11:09 am (window open, rounded "back" to the minute), a one-hour hold at T-6 hours, and then everything else "standard":
  
  T-11 hours counting: 7:19 pm
  T-6 hours holding:  12:19 am
  T-6 hours counting:  1:19 am
  T-3 hours holding:   4:19 am
  T-3 hours counting:  7:19 am
  T-20 min. holding:   9:59 am
  T-20 min. counting: 10:09 am
  T-9 min. holding:   10:20 am
  
  (Can't confirm, but that's the way I have it.)