Jump to content

[New] Space Launch System / Orion Discussion Thread


Recommended Posts

Hydrogen bleed configuration has been correctly switched on three RS-25, but engine #3 not. Troubleshooting has been ongoing, now they're going to make the engines warm up and then chill them down again hoping this equalizes the temperatures

Link to comment
Share on other sites

8 minutes ago, darthvader15001 said:

Timer paused at t- 00-40-00 for the engineers to discuss the problem with the flight director

I will be posting frequent updates on the launch here.

@Beccab already was, but they seem to have stopped.

Edited by intelliCom
Link to comment
Share on other sites

4 minutes ago, intelliCom said:

@Beccab Already was, but they seem to have stopped.

Yeah I was having launch, it didn't seem to be happening much atm. Good news is that the flange issues has been solved, so the main blocker now other than time is RS-25 hydrogen bleed

Link to comment
Share on other sites

2 minutes ago, Beccab said:

so the main blocker now other than time is RS-25 hydrogen bleed

Do we know any details about the hydrogen bleed? Is there a leak in the pipes from the tank to one of the engines? Or is the engine itself leaking hydrogen? Is this kind of issue a critical one, or is it possible they'll be able to disregard it and launch anyway? Thanks :)

Link to comment
Share on other sites

3 minutes ago, michal.don said:

Do we know any details about the hydrogen bleed? Is there a leak in the pipes from the tank to one of the engines? Or is the engine itself leaking hydrogen? Is this kind of issue a critical one, or is it possible they'll be able to disregard it and launch anyway? Thanks :)

They don’t want to take any risks, so they paused the countdown

Link to comment
Share on other sites

3 minutes ago, linuxgurugamer said:

From what I just heard, that was resolved

I don't think so. Mind citing a source? I've been following NASA TV's stream with operational commentary and I didn't hear anything about that.

Link to comment
Share on other sites

5 minutes ago, michal.don said:

Do we know any details about the hydrogen bleed? Is there a leak in the pipes from the tank to one of the engines? Or is the engine itself leaking hydrogen? Is this kind of issue a critical one, or is it possible they'll be able to disregard it and launch anyway? Thanks :)

I think the problem is that Engine 3 isn't in a hydrogen bleed like the other engines are intentionally doing. I am probably wrong though.

Edited by intelliCom
Link to comment
Share on other sites

3 minutes ago, darthvader15001 said:

Hmm, I’ll try to find him in the crowd:wink: I mean everyday astronaut

Probably pretty bad if they had to pause the timer

Well to be totally fair they pause it when a fly lands on it, but a potential crack and fuel issue sounds pretty bad.

Link to comment
Share on other sites

4 minutes ago, Minmus Taster said:

Well to be totally fair they pause it when a fly lands on it, but a potential crack and fuel issue sounds pretty bad.

That "crack" was basically an optical illusion; nothing to worry about I think. Main issue we've heard of now is Engine 3's lack of hydrogen bleed.

Link to comment
Share on other sites

14 minutes ago, michal.don said:

Do we know any details about the hydrogen bleed? Is there a leak in the pipes from the tank to one of the engines? Or is the engine itself leaking hydrogen? Is this kind of issue a critical one, or is it possible they'll be able to disregard it and launch anyway? Thanks :)

Late reply but, the issue is that an SSME before firing must be chilled down and capable of "bleeding" LH2/LOX when commanded by mission control in order to be started correctly; three RS-25 are working correctly, but engine #3 isn't doing it which led to some delays in the countdown and now the half an hour unplanned hold. This is the part that should have been tested in the Wet Dress Reharsal number four, but wasn't because issues with the fueling operations interrupted the countdown too early making this the first complete hydrogen bleed test on Artemis I (and probably the first time it's done since 2011)

We're now half an hour from the opening of the launch window, and 2 hours and a half from its closure

Uh oh:

 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...