Author Topic: Artemis I Pre-Launch Testing at LC-39B (Leading up to and including all WDR's)  (Read 122296 times)

Offline centaurinasa

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- 03:00:00
To boldly go where no human has gone before !

Offline rdale

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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?

Offline Orbiter

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« Last Edit: 04/04/2022 06:38 pm by Orbiter »
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Offline centaurinasa

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To boldly go where no human has gone before !

Offline ulm_atms

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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

Offline Overwatchfan123

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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.
« Last Edit: 04/04/2022 06:51 pm by Overwatchfan123 »
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Offline oldAtlas_Eguy

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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.
« Last Edit: 04/04/2022 07:09 pm by oldAtlas_Eguy »

Offline cplchanb

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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

Offline cplchanb

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Offline Orbiter

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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
« Last Edit: 04/04/2022 07:25 pm by Orbiter »
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Offline Orbiter

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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!
« Last Edit: 04/04/2022 07:30 pm by Orbiter »
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Offline Conexion Espacial

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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.
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Offline Orbiter

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Offline Orbiter

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At this point we should be well into LH2 chilldown & coming up on LH2 slow fill start.
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Offline RocketLover0119

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"The Starship has landed"

Offline Orbiter

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

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« Last Edit: 04/04/2022 08:52 pm by Orbiter »
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Offline hektor

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Offline Overwatchfan123

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

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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.
« Last Edit: 04/04/2022 09:16 pm by oldAtlas_Eguy »

 

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