Author Topic: Artemis I Pre-Launch Testing at LC-39B (Leading up to and including all WDR's) (Read 128470 times)

centaurinasa · « **Reply #80 on:** 04/04/2022 06:32 pm »

- 03:00:00

rdale · « **Reply #81 on:** 04/04/2022 06:35 pm »

Quote from: oldAtlas_Eguy on 04/04/2022 06:00 pm

What concerns me is that since this issue is very close to identical to one encountered by the Green Run and solved then almost 1- 1/2 years ago.

I'm not sure it's close - let alone identical - to that issue. Where are you hearing this?

Orbiter · « **Reply #82 on:** 04/04/2022 06:37 pm »

Into LOX chilldown. Pressing ahead.

https://twitter.com/NASAGroundSys/status/1511049946304327682

centaurinasa · « **Reply #83 on:** 04/04/2022 06:42 pm »

https://twitter.com/SpaceflightNow/status/1511051552664039432?cxt=HHwWkMC9nbPYqvgpAAAA

ulm_atms · « **Reply #84 on:** 04/04/2022 06:47 pm »

Quote from: cplchanb on 04/04/2022 06:15 pm

Quote from: oldAtlas_Eguy on 04/04/2022 06:00 pm
What concerns me is that since this issue is very close to identical to one encountered by the Green Run and solved then almost 1- 1/2 years ago. That brings into question as to whether these procedures had even been revisited and updated since the Green Run with lessons learned.

How is this the same? The green run had the issue during firing while this one is with the LOX sensor.

SLS's first WDR. https://forum.nasaspaceflight.com/index.php?topic=44402.msg2165617#msg2165617

Overwatchfan123 · « **Reply #85 on:** 04/04/2022 06:50 pm »

Quote from: ulm_atms on 04/04/2022 06:47 pm

Quote from: cplchanb on 04/04/2022 06:15 pm
Quote from: oldAtlas_Eguy on 04/04/2022 06:00 pm
What concerns me is that since this issue is very close to identical to one encountered by the Green Run and solved then almost 1- 1/2 years ago. That brings into question as to whether these procedures had even been revisited and updated since the Green Run with lessons learned.

How is this the same? The green run had the issue during firing while this one is with the LOX sensor.
SLS's first WDR. https://forum.nasaspaceflight.com/index.php?topic=44402.msg2165617#msg2165617

I remember that! I was the last person to add to that thread.

oldAtlas_Eguy · « **Reply #86 on:** 04/04/2022 06:54 pm »

Quote from: cplchanb on 04/04/2022 06:15 pm

Quote from: oldAtlas_Eguy on 04/04/2022 06:00 pm
What concerns me is that since this issue is very close to identical to one encountered by the Green Run and solved then almost 1- 1/2 years ago. That brings into question as to whether these procedures had even been revisited and updated since the Green Run with lessons learned.

How is this the same? The green run had the issue during firing while this one is with the LOX sensor.

Based on a tweet by NASA EGS. NASA may have intentionally took note of but ignored intentionally such possible issues encountered during the Green run related to engineering expectations as to how the WDR should run and its limits settings in order to find the ones that do not and to then understand why.

Also as to some of my post is when I tried to trace down details, the exact items as mentioned that would make the two occurrences close to being the same was not found. The NASA EGS tweet has alleviated some of my concerns about thier preparedness and goals for this test. Some of those goals may go against the group that is other than engineering motivated though.

Added: See post below.

That does not change my reevaluation of NASA engineering goals for this test though and how they intentionally pushed the limits to what things domineeringly should be the case vs the experienced ones encountered in the Green Run. Since a similar one occurred again likely means there is some sort of error in the models being used.

cplchanb · « **Reply #87 on:** 04/04/2022 06:56 pm »

Quote from: ulm_atms on 04/04/2022 06:47 pm

Quote from: cplchanb on 04/04/2022 06:15 pm
Quote from: oldAtlas_Eguy on 04/04/2022 06:00 pm
What concerns me is that since this issue is very close to identical to one encountered by the Green Run and solved then almost 1- 1/2 years ago. That brings into question as to whether these procedures had even been revisited and updated since the Green Run with lessons learned.

How is this the same? The green run had the issue during firing while this one is with the LOX sensor.
SLS's first WDR. https://forum.nasaspaceflight.com/index.php?topic=44402.msg2165617#msg2165617

Good spot. We'll... I guess we'll find out during the next press briefing. Until then it's full speed ahead to tanking and hopefully an evening countdown

cplchanb · « **Reply #88 on:** 04/04/2022 07:22 pm »

https://twitter.com/NASAGroundSys/status/1511060935393398789?s=20&t=yWqHFCFtB1M1RCQ5raB_8Q

Finally its happening!!!!!!

Orbiter · « **Reply #89 on:** 04/04/2022 07:22 pm »

Is this the right thread to post WDR updates? A lot of discussion going on.

LOX slow fill has started! Roughly 7 hours behind the original schedule.

https://twitter.com/NASAGroundSys/status/1511060935393398789

Orbiter · « **Reply #90 on:** 04/04/2022 07:29 pm »

Starting to see some vapors ticking up at the bottom of the MLP. This is a good sign that fueling is progressing.

Welcome back to action LC-39B!

Conexion Espacial · « **Reply #91 on:** 04/04/2022 07:30 pm »

Quote from: Orbiter on 04/04/2022 07:22 pm

Is this the right thread to post WDR updates? A lot of discussion going on.

LOX slow fill has started! Roughly 7 hours behind the original schedule.

https://twitter.com/NASAGroundSys/status/1511060935393398789

This is the correct thread, you can see some activity at the base of the rocket due to LOX loading.

Orbiter · « **Reply #92 on:** 04/04/2022 07:32 pm »

LOX fast fill has started.

https://twitter.com/NASAGroundSys/status/1511063772827422726

Orbiter · « **Reply #93 on:** 04/04/2022 07:40 pm »

At this point we should be well into LH2 chilldown & coming up on LH2 slow fill start.

RocketLover0119 · « **Reply #94 on:** 04/04/2022 07:45 pm »

LH2 chilldown has begun!

https://twitter.com/NASAGroundSys/status/1511066952218910729?s=20&t=qYY5J9fZTDc0v7vIL3H0UQ

Orbiter · « **Reply #95 on:** 04/04/2022 08:06 pm »

We've yet to receive word about LH2 filling, but if they're on the original timeline we should be well into it.

Orbiter · « **Reply #96 on:** 04/04/2022 08:14 pm »

https://twitter.com/NASAGroundSys/status/1511074321644597253

https://twitter.com/NASAGroundSys/status/1511080413732782088

hektor · « **Reply #97 on:** 04/04/2022 09:00 pm »

Scrub

Overwatchfan123 · « **Reply #98 on:** 04/04/2022 09:02 pm »

Quote from: hektor on 04/04/2022 09:00 pm

Scrub

I knew it. Countdown clock is holding at T-31:36.

oldAtlas_Eguy · « **Reply #99 on:** 04/04/2022 09:11 pm »

Quote from: Orbiter on 04/04/2022 08:14 pm

https://twitter.com/NASAGroundSys/status/1511074321644597253

https://twitter.com/NASAGroundSys/status/1511080413732782088

A probable pneumatic actuated valve that is controlled via a likely electronic small valve in the ML that pressurizes the tube going up to the bigger on 160 level ML valve. You want a separation from the LH2 valves from electricity. There are multiple failure points that it could be. Hopefully something simple easily found and corrected.