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Thread: Artemis 1 due to launch today (Saturday 3rd September at 19:17 BST UK time onwards)

  1. #51
    Grand Master markrlondon's Avatar
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    Sad.

    Look like an official scrub may be announced soon according to comments by NASASpaceflight channel. They can't fix the LH leak in time.

  2. #52
    Grand Master markrlondon's Avatar
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    And it's been officially scrubbed for today.


    ** Update **

    Blog post:

    https://blogs.nasa.gov/artemis/2022/...empt-scrubbed/
    Artemis I Launch Attempt Scrubbed

    Rachel Kraft
    Posted on September 3, 2022 11:22 am

    The launch director waived off today’s Artemis I launch attempt at approximately 11:17 a.m. EDT. Teams encountered a liquid hydrogen leak while loading the propellant into the core stage of the Space Launch System rocket. Multiple troubleshooting efforts to address the area of the leak by reseating a seal in the quick disconnect where liquid hydrogen is fed into the rocket did not fix the issue. Engineers are continuing to gather additional data.
    Last edited by markrlondon; 3rd September 2022 at 16:25.

  3. #53
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    Scrubbed again. Next try Monday

  4. #54
    Master Rod's Avatar
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    Sounds like it will need to be moved back to the garage for checking.

  5. #55
    Grand Master PickleB's Avatar
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    Wiki link: "...due to a hydrogen leak on the quick-disconnect connnection of the tail service mast umbilical, the countdown could not reach the planned T-9.3 seconds mark and was stopped automatically at T-29 seconds..."


    And when was that? June 20 and after it "NASA mission managers soon determined they had completed almost all planned test objectives and declared the pre-launch wet dress rehearsal campaign complete." It now seems like that was a premature decision.


    I have to say that I was watching La Vuelta a Espańa and round 6 of the FIM JuniorGP™ World Championship at the time today's scrub was announced.
    Last edited by PickleB; 3rd September 2022 at 17:14.

  6. #56
    Master mr noble's Avatar
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    I wonder how confident the astronauts who are booked to go on Artemis II are feeling!? 😬


    Maybe they need to ask some of the Space X techs for some help. I’m a space launch mega fan but a leak on the H filler that they couldn’t sort in a few hours does sound rather amateur.

    And while congress is watching and are desperate to pull the plug and divert the billions of $$ to other areas…..this third scrub isn’t good.

  7. #57
    Grand Master markrlondon's Avatar
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    Quote Originally Posted by mr noble View Post
    I wonder how confident the astronauts who are booked to go on Artemis II are feeling!? 
    To be honest, about the same as before today I would have thought. Stuff like this is why there are tests and, so far, it's really only been a minor issue.

    Quote Originally Posted by mr noble View Post
    a leak on the H filler that they couldn’t sort in a few hours does sound rather amateur.
    Whilst one would certainly have hoped they could sort it out, nothing is simple when dealing with liquid hydrogen. Hydrogen seems like such a good fuel but cryogenic LH is absolute hell to handle, as I understand it.

    Quote Originally Posted by mr noble View Post
    And while congress is watching and are desperate to pull the plug and divert the billions of $$ to other areas…..this third scrub isn’t good.
    Does Congress want to kill it, or does Congress want it to continue at any cost for pork barrelism? I've not been following the politics closely enough.

  8. #58
    Master mr noble's Avatar
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    You’d think after 60 years of playing with LH and space rockets, they’d have the fuelling nozzles sorted. It’s rather embarrassing for NASA.

    Yes, from a political POV, I think a lot of Americans would prefer to see these billions of dollars spent on helping folk with medicare or filling in potholes, than sending rockets into space.

    I’m a huge fan of all things space and fully appreciate the complexities of sending stuff into orbit and beyond, I’m just gutted they’ve had to scrub three attempts for trivial technical reasons as it doesn’t help their longer term finding goals.

    Fingers firmly crossed for the next launch window.

    I can’t wait to see humans on the moon again. So excited to see that.

  9. #59
    Grand Master markrlondon's Avatar
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    Quote Originally Posted by mr noble View Post
    I’m just gutted they’ve had to scrub three attempts
    'Just' two attempts for Artemis 1. Next launch attempt will be the third try.

  10. #60
    Master mr noble's Avatar
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    Yes, you’re right. My bad. 2nd attempt.

    Feels like the 3rd for some reason.

    Hopefully the third attempt will be a success.

  11. #61
    Grand Master markrlondon's Avatar
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    Quote Originally Posted by mr noble View Post
    Hopefully the third attempt will be a success.
    I really hope so!

  12. #62
    Master Sinnlover's Avatar
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    There is no rush and I am pretty sure any perimeters outside of 100% perfect will mean a scrub.
    Better to delay than have egg of your face because it went up like a Roman candle.

  13. #63
    Grand Master markrlondon's Avatar
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    There's a news conference ongoing right now here: https://www.youtube.com/watch?v=GNpR...b_channel=NASA



    Some brief notes from the conference:-

    Issue is (probably) a quick disconnect seal.
    Not sure exactly what they need to do to fix it yet.
    Going to examine it in more detail.
    How large is the leak? They were seeing two or three times the flammability risk 4% H2 concentration in the area of the connection.
    Nature of what needs to be replaced? Maybe need to replace the hardware but they don't know yet. Needs direct eyes on investigation.
    Their experience of component testing tells them that a leak of this magnitude is typically resolved through a replacement of the seal, but they need to investigate first.

    Oh dear, if I infer correctly from what they are now saying, there may have been an accidental over-pressure event (due to an incorrect command) at the 'interface' that was leaking. They are looking into whether or not that might have caused the problem.

    They've tested the quick disconnect, it's worked "a couple of times" (i.e. 100%) in testing, but it didn't work today.

    The inadvertent command that caused an over-pressurisation event was part of a manual sequence, could be that it wasn't automated caused it, all subject to investigation.

    It is a non-metallic seal that is in question.

    Artemis 2 is still planned for 2024. No change due to this.

    Costs? They aren't sure. Lots of tankers though for topups when they de-tank. "The cost of two scrubs is a lot less than the cost of failure". :-)

    Cubesats (apparently there are some cubesats hitching a ride) might have some battery charging issues but it's not a big deal at the moment.

    They claim not to be feeling any external pressure on this!

    If they need to cryoload the interface they'd need to get to fast fill the tank no more than 5% full, so not too long if they needed to do that. Difficult to tell how long they could turn for a launch though.

    They can turn around between 48-72 hours simply depending on commodity (i.e. gases) re-supply.

    If they have to do engineering work then obviously that will extend things.

    22:30 UK time: Conference ends.




    Mark's summary:-
    It pretty much (predictably) boils down to: "We need to investigate". However, two things that stood out for me were (a) the erroneous manual command that, if I understand correctly, resulted in an over-pressure at the interface that had problems and (b) based upon their experience with previous testing, a leak of this magnitude is typically caused by a faulty seal. In other words, it's very, very early days but it looks like it may be a damaged seal. However, they won't leap to conclusions without carrying out the necessary investigations to know for sure.
    Last edited by markrlondon; 3rd September 2022 at 22:34.

  14. #64
    Grand Master PickleB's Avatar
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    September 3, 2022 6:26 pm: "...mission managers met and decided they will forego additional launch attempts in early September. Over the next several days, teams will establish access to the area of the leak at Launch Pad 39B, and in parallel conduct a schedule assessment to provide additional data that will inform a decision on whether to perform work to replace a seal either at the pad, where it can be tested under cryogenic conditions, or inside the Vehicle Assembly Building..."

  15. #65
    Grand Master Neil.C's Avatar
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    I'll be out at my son's place on the space coast in just over a week so I might see the launch from his back yard again!

    Here's an earlier launch over morning coffee.

    Cheers,
    Neil.

    My Speedmaster website:

    http://www.freewebs.com/neil271052

  16. #66
    Grand Master markrlondon's Avatar
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    Quote Originally Posted by Neil.C View Post
    I'll be out at my son's place on the space coast in just over a week so I might see the launch from his back yard again!

    Here's an earlier launch over morning coffee.
    That is lovely. :-)

  17. #67
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    Quote Originally Posted by PickleB View Post
    September 3, 2022 6:26 pm: "...mission managers met and decided they will forego additional launch attempts in early September. Over the next several days, teams will establish access to the area of the leak at Launch Pad 39B, and in parallel conduct a schedule assessment to provide additional data that will inform a decision on whether to perform work to replace a seal either at the pad, where it can be tested under cryogenic conditions, or inside the Vehicle Assembly Building..."
    Based on what I read (and posted before) they have to go back to the VAB anyway due to the FTS now needing to be replaced.

  18. #68
    Looks like they've got the fuelling situation under control:

    https://www.bbc.co.uk/news/science-environment-62982986

  19. #69
    Grand Master PickleB's Avatar
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    Quote Originally Posted by jools View Post
    Looks like they've got the fuelling situation under control:

    https://www.bbc.co.uk/news/science-environment-62982986
    If it's a go for Tu 27 Sep then the launch window is:

    15:37-16:47 UT, 16:37-17:47 BST, 11:37-12:47 EDT


    The next one is on Su 02 Oct.

  20. #70
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    Sounds like the FTS I mentioned before (and weather) is now the factor that will determine launch.

  21. #71
    Grand Master Neil.C's Avatar
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    Quote Originally Posted by PickleB View Post
    If it's a go for Tu 27 Sep then the launch window is:
    15:37-16:47 UT, 16:37-17:47 BST, 11:37-12:47 EDT


    The next one is on Su 02 Oct.

    I'm on the space coast now so I hope to see the launch.
    Cheers,
    Neil.

    My Speedmaster website:

    http://www.freewebs.com/neil271052

  22. #72
    Quote Originally Posted by Neil.C View Post
    I'm on the space coast now so I hope to see the launch.
    Good timing!

  23. #73
    Grand Master Neil.C's Avatar
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    Quote Originally Posted by reecie View Post
    Sounds like the FTS I mentioned before (and weather) is now the factor that will determine launch.
    They are talking about a hurricane on Wednesday!
    Cheers,
    Neil.

    My Speedmaster website:

    http://www.freewebs.com/neil271052

  24. #74
    Grand Master PickleB's Avatar
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    Quote Originally Posted by Rod View Post
    Sounds like it will need to be moved back to the garage for checking.
    Link:

    ...During a Sept. 23 teleconference, NASA announced an extension for the flight termination system battery certification, which expired after 25 days on Sept. 6. Now the Space Force’s Eastern Range has granted a waiver to allow the rocket to launch as late as Oct. 2 before needing to be returned to the Vehicle Assembly building to recertify the batteries...


    Hmmm...fingers crossed.

  25. #75
    Grand Master PickleB's Avatar
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    Quote Originally Posted by Neil.C View Post
    They are talking about a hurricane on Wednesday!
    Blog:

    ...Managers met Sunday evening to review the latest information on the storm from the National Oceanic and Atmospheric Administration, the U.S. Space Force, and the National Hurricane Center and decided to meet again Monday to allow for additional data gathering overnight before making the decision on roll back...

    When I looked at www.hurricanes.gov half an hour ago Ian was a storm. Now it's a hurricane.

  26. #76
    Grand Master PickleB's Avatar
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    Back to the VAB for shelter it is...link.

    They've been streaming for many hours...so you can watch the rollback live.
    Last edited by PickleB; 26th September 2022 at 17:40.

  27. #77

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