Author Topic: Artemis I Pre-Launch Testing at LC-39B (Leading up to and including all WDR's)  (Read 123049 times)

Offline centaurinasa

  • Senior Member
  • *****
  • Posts: 11099
  • CETI Alpha V
  • Liked: 7469
  • Likes Given: 4154
« Last Edit: 04/14/2022 07:33 pm by centaurinasa »
To boldly go where no human has gone before !

Offline centaurinasa

  • Senior Member
  • *****
  • Posts: 11099
  • CETI Alpha V
  • Liked: 7469
  • Likes Given: 4154
To boldly go where no human has gone before !

Offline centaurinasa

  • Senior Member
  • *****
  • Posts: 11099
  • CETI Alpha V
  • Liked: 7469
  • Likes Given: 4154
« Last Edit: 04/14/2022 07:39 pm by centaurinasa »
To boldly go where no human has gone before !

Offline centaurinasa

  • Senior Member
  • *****
  • Posts: 11099
  • CETI Alpha V
  • Liked: 7469
  • Likes Given: 4154
« Last Edit: 04/14/2022 07:42 pm by centaurinasa »
To boldly go where no human has gone before !

Offline Conexion Espacial

  • Full Member
  • ****
  • Posts: 1766
  • Liked: 2387
  • Likes Given: 1807
I publish information in Spanish about space and rockets.
https://twitter.com/conexionspacial

Offline 2024MoonShot

  • Member
  • Posts: 61
  • Liked: 24
  • Likes Given: 32
Looks like they'll have to try again after figuring out where the leak is.

Offline hektor

  • Senior Member
  • *****
  • Posts: 2425
  • Liked: 1006
  • Likes Given: 42
« Last Edit: 04/14/2022 09:29 pm by hektor »

Offline VSECOTSPE

  • Full Member
  • ****
  • Posts: 985
  • Liked: 3482
  • Likes Given: 2

Hydrogen umbilical leak:

Quote
Controllers, though, stopped liquid hydrogen loading again after detecting a leak in an umbilical line connecting the core stage to the tail service mast on the launch platform. At that point the core stage’s liquid oxygen tank was 49% full but the liquid hydrogen tank only 5% full.

NASA effectively scrubbed the test around 4 p.m. Eastern when it announced it would not continue filling the core stage tanks and instead focus on chilling down propellant lines in the SLS’s upper stage. NASA managers previously decided not to fill the tanks on that upper stage in this test because of a faulty helium check valve in the stage.

It was not immediately clear when NASA would try again to complete the wet dress rehearsal of the SLS. NASA said only it would not proceed with the terminal stage of the countdown and instead “will assess next steps after today’s operations.”

https://spacenews.com/nasa-halts-third-attempt-at-sls-practice-countdown/

Hydrogen leaks dogged STS throughout the program and caused a number of launch delays, sometimes long ones:

2010
https://www.nytimes.com/2010/11/06/us/06shuttle.html

2009
https://www.csmonitor.com/USA/2009/0618/p02s01-usgn.html

2002
https://www.nytimes.com/2002/04/05/us/fuel-leak-delays-launching-of-space-shuttle.html

1995
https://www.latimes.com/archives/la-xpm-1995-09-29-mn-51341-story.html

1990
https://www.latimes.com/archives/la-xpm-1990-09-06-mn-1019-story.html

1988
https://www.upi.com/Archives/1988/07/28/Fueling-of-the-shuttle-Discovery-in-a-twice-delayed-countdown/8022586065600/

1983
https://www.nytimes.com/1983/01/26/us/hydrogen-leak-forces-second-space-shuttle-delay.html

1990 was especially bad:

https://www.americaspace.com/2015/08/01/summer-of-discontent-25-years-since-the-shuttle-hydrogen-leaks-part-1/

https://www.americaspace.com/2015/08/02/summer-of-discontent-25-years-since-the-shuttle-hydrogen-leaks-part-2/

FWIW...

Offline centaurinasa

  • Senior Member
  • *****
  • Posts: 11099
  • CETI Alpha V
  • Liked: 7469
  • Likes Given: 4154
To boldly go where no human has gone before !

Offline Conexion Espacial

  • Full Member
  • ****
  • Posts: 1766
  • Liked: 2387
  • Likes Given: 1807

Artemis I WDR Update: Third Test Attempt Concluded

Teams concluded today’s wet dress rehearsal test at approximately 5:10 p.m. EDT after observing a liquid hydrogen (LH2) leak on the tail service mast umbilical, which is located at the base of the mobile launcher and connects to the rocket’s core stage. The leak was discovered during liquid hydrogen loading operations and prevented the team from completing the test.


Before ending the test, teams also met test objectives for the interim cryogenic propulsion stage by chilling down the lines used to load propellant into the upper stage. They did not flow any propellant to the stage because of an issue with a helium check valve identified several days ago.


When teams paused propellant loading, the rocket’s core stage liquid oxygen tank was about 49% filled and the liquid hydrogen tank had been loaded to about 5% capacity prior to the hydrogen leak.


Teams are now working to drain propellant from the rocket. They will inspect the umbilical connection, review data, and establish a go-forward plan to address the hydrogen leak.


NASA plans to host a media teleconference April 15 to provide updates on troubleshooting and next steps for the wet dress rehearsal test.

I publish information in Spanish about space and rockets.
https://twitter.com/conexionspacial

Offline Targeteer

  • Senior Member
  • *****
  • Posts: 5161
  • near hangar 18
  • Liked: 2110
  • Likes Given: 782
April 14, 2022
MEDIA ADVISORY M22-054
NASA to Discuss Initial Findings from Artemis Moon Mission Modified Test

NASA will hold a media teleconference at 3 p.m. EDT on Friday, April 15, to discuss the wet dress rehearsal test of the agency’s Space Launch System (SLS) rocket and Orion spacecraft at Launch Complex 39B at the agency’s Kennedy Space Center in Florida ahead of the uncrewed Artemis I lunar mission.

The teleconference will stream live on the agency’s website.

Teleconference participants include:

    Charlie Blackwell-Thompson, Artemis launch director, NASA Exploration Ground Systems program, Kennedy
    Mike Sarafin, Artemis mission manager, NASA Headquarters

To participate by telephone, media must RSVP no later than two hours prior to the start of the event to: [email protected] 

NASA’s third test attempt began April 12 with a modified test procedure and concluded April 14. The test focused on using the ground systems at the Kennedy spaceport to load propellant into the Space Launch System (SLS) rocket’s core stage tanks, with minimal propellant operations on the upper stage.

Engineers encountered a liquid hydrogen leak on the tail service mast umbilical that prevented the team from completing the test. Before ending the test, teams were able to collect additional data by chilling down the lines used to load propellant into the upper stage. The rocket remains in a safe configuration as teams asses next steps.

Through Artemis missions, NASA will land the first woman and the first person of color on the Moon, paving the way for a long-term lunar presence and serving as a steppingstone to send astronauts to Mars.

For updates, follow along on NASA’s Artemis blog at:

https://blogs.nasa.gov/artemis
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline zubenelgenubi

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 8455
  • Arc to Arcturus, then Spike to Spica
  • Sometimes it feels like Trantor in the time of Hari Seldon
  • Liked: 4996
  • Likes Given: 45177
Moderator:
I split/merged 20? posts to the Artemis I discussion thread.  They were less directly related to the business at hand.

The WDR should now be easier to follow in this thread.
Support your local planetarium! (COVID-panic and forward: Now more than ever.)
My current avatar is saying "i wants to go uppies!"

Offline centaurinasa

  • Senior Member
  • *****
  • Posts: 11099
  • CETI Alpha V
  • Liked: 7469
  • Likes Given: 4154
To boldly go where no human has gone before !

Offline zubenelgenubi

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 8455
  • Arc to Arcturus, then Spike to Spica
  • Sometimes it feels like Trantor in the time of Hari Seldon
  • Liked: 4996
  • Likes Given: 45177
Quote
Today at 3pm ET, we are sharing details about yesterday’s modified wet dress rehearsal attempt for #Artemis I, where the NASAGroundSys team worked on refining the countdown procedures as they practiced tanking NASA_SLS’s core stage. Listen in at http://nasa.gov/live.

Edit: Briefing is over; I found the YT link after the fact.


« Last Edit: 04/16/2022 03:36 pm by zubenelgenubi »
Support your local planetarium! (COVID-panic and forward: Now more than ever.)
My current avatar is saying "i wants to go uppies!"

Online AnalogMan

  • Member
  • Senior Member
  • *****
  • Posts: 3351
  • Cambridge, UK
  • Liked: 1448
  • Likes Given: 44
Quote
Today at 3pm ET, we are sharing details about yesterday’s modified wet dress rehearsal attempt for #Artemis I, where the NASAGroundSys team worked on refining the countdown procedures as they practiced tanking NASA_SLS’s core stage. Listen in at http://nasa.gov/live.
How did the briefing go?  I found no link a few minutes ago--already over?

Link:



Teleconference starts at 8mins 45 seconds
« Last Edit: 04/15/2022 08:24 pm by AnalogMan »

Offline Khadgars

  • Full Member
  • ****
  • Posts: 1725
  • Orange County, California
  • Liked: 1103
  • Likes Given: 3038
Next opportunity for WDR 4 would be Thursday next week.  Will determine feasibility once they find root cause of the LH2 leak.  Should have access to ML today for troubleshooting.

When asked they said this WDR is within family of STS and even Saturn V.
Evil triumphs when good men do nothing - Thomas Jefferson

Offline centaurinasa

  • Senior Member
  • *****
  • Posts: 11099
  • CETI Alpha V
  • Liked: 7469
  • Likes Given: 4154
To boldly go where no human has gone before !

Offline centaurinasa

  • Senior Member
  • *****
  • Posts: 11099
  • CETI Alpha V
  • Liked: 7469
  • Likes Given: 4154
To boldly go where no human has gone before !

Offline oldAtlas_Eguy

  • Senior Member
  • *****
  • Posts: 5173
  • Florida
  • Liked: 4743
  • Likes Given: 1022
In the Crew 4 FRR it was stated that Crew 4 has priority over Artemis I WDR. Note as well that the Dry Dress rehearsal with crew on the pad is set for Apr 20. Followed afterward that afternoon to night with the Hot Fire test. On April 21 if the range is not busy with some remaining Crew 4 activities then there is a scheduled Starlink launch from LC-40. Then if that is scrubbed it would leapfrog to likely sometime after Crew 4 which at this time is scheduled for Apr 23, weather and Hot Fire results pending. Crew 4 also has launch availability on Apr 24 and 25th.

If a WDR would not be done until Apr 21 then it will be delayed to after Crew 4 at the earliest being likely Apr 26 and could end even being in May. ISS Beta cutout starts May 10. So Crew 3 has to leave before then else it has to stick around until after May 20th.

Here is hopping for clear weather for next week.


 

Advertisement NovaTech
Advertisement SkyTale Software GmbH
Advertisement Northrop Grumman
Advertisement
Advertisement Brady Kenniston
Advertisement NextSpaceflight
Advertisement Nathan Barker Photography
0