Author Topic: SpaceX’s Crew Dragon spacecraft static fire anomaly - THREAD 3  (Read 161506 times)

Online Chris Bergin

Thread 1:
https://forum.nasaspaceflight.com/index.php?topic=48003.0

Thread 2 opens with the warning from the end of Thread 1:

Quote
...keep your "posts are speculation" hat on. Should we have only updates? No, because the "updates" are MSM speculation articles like that hilarious one on IB Times or the "CLICK ME!" Futurism article. Do we have discussion where everyone has to post a very informed post? Impossible. But it's very important everyone states they are speculating to avoid people getting confused and their knickers in a twist.
https://forum.nasaspaceflight.com/index.php?topic=48047.0

And Thread 3 after that was ignored in later pages.

Baseline article:

https://www.nasaspaceflight.com/2019/04/spacexs-crew-dragon-spacecraft-anomaly-static-fire-testing/

By Michael Baylor

https://twitter.com/NASASpaceflight/status/1119739271374692352

Again, please don't post unless you think that post is going to be useful to a thread that will get over a hundred thousands of reads (like Thread 1).

Think to yourself before posting: "Am I adding something useful/interesting to the debate?" If you like someone's point, just like it.

On topic, civil, interesting or don't post on this thread. Thread will be trimmed if usual suspects try to derail it.
Support NSF via L2 -- Help improve NSF -- Site Rules/Feedback/Updates
**Not a L2 member? Whitelist this forum in your adblocker to support the site and ensure full functionality.**

Offline RocketLover0119

  • Senior Member
  • *****
  • Posts: 2896
  • Space Geek
  • Tampa, Florida
  • Liked: 6802
  • Likes Given: 1609
Feel free to move to a more appropriate thread, wasn't sure which one it belonged in

Julia B took a boat tour this morning and spotted the Crew Dragon Test stand in shambles:

https://twitter.com/julia_bergeron/status/1139884315037356033
"The Starship has landed"

Offline Rondaz

  • Senior Member
  • *****
  • Posts: 27059
  • Liked: 5301
  • Likes Given: 169
NASA boss says 'no doubt' SpaceX explosion delays flight program..

Eric M. Johnson
Published: 6 hours ago

https://www.journalpioneer.com/news/world/nasa-boss-says-no-doubt-spacex-explosion-delays-flight-program-323465/

Offline vulture4

  • Full Member
  • ****
  • Posts: 1101
  • Liked: 431
  • Likes Given: 92
However it is unclear much of the delay is for SpaceX to actually correct the problem and how much is for NASA to decide it is comfortable with the corrective action.

Offline mn

  • Full Member
  • ****
  • Posts: 1119
  • United States
  • Liked: 1006
  • Likes Given: 367
NASA boss says 'no doubt' SpaceX explosion delays flight program..

Eric M. Johnson
Published: 6 hours ago

https://www.journalpioneer.com/news/world/nasa-boss-says-no-doubt-spacex-explosion-delays-flight-program-323465/

Whoever thought the failure will not delay the schedule please raise your hand.

Why is this even news? Which part of this did anyone with a brain not know yet?

Offline ChrML

  • Full Member
  • *
  • Posts: 116
  • Liked: 69
  • Likes Given: 0
However it is unclear much of the delay is for SpaceX to actually correct the problem and how much is for NASA to decide it is comfortable with the corrective action.
Also to determine what oversight caused the explosion in the first place, and whether there is a risk for similar oversights elsewhere on the vehicle that could cause similar issues.

Offline Inoeth

However it is unclear much of the delay is for SpaceX to actually correct the problem and how much is for NASA to decide it is comfortable with the corrective action.
Also to determine what oversight caused the explosion in the first place, and whether there is a risk for similar oversights elsewhere on the vehicle that could cause similar issues.

or if oversight was an issue at all or if it was a 'simple' case of a previously unknown issue that cropped up, quite possibly due to salt water (given the years of successful tests prior to this) or some other unknown defect, or if indeed there was an oversight issue that allowed the RUD to occur...

and yeah, as usual I fully expect quite  a bit of the delay to be SpaceX waiting on NASA to give the offical word that they agree with SpaceX's assessment of what went wrong and what they plan to do to fix it...

I will say that given the latest news about the FCC communications approval for the Crew launch from November 2019 to May 2020 that's a decent sign that SpaceX (and NASA) are fairly comfortable with where they are in the process or else I doubt SpaceX would have sought this application to begin with...

I'm hoping that in the next couple weeks at most we'll hear some more details about the what/why things went wrong, their plan to fix it and an updated TL.

Offline JamesH65

  • Full Member
  • ****
  • Posts: 1574
  • Liked: 1752
  • Likes Given: 10
However it is unclear much of the delay is for SpaceX to actually correct the problem and how much is for NASA to decide it is comfortable with the corrective action.
Also to determine what oversight caused the explosion in the first place, and whether there is a risk for similar oversights elsewhere on the vehicle that could cause similar issues.

It doesn't have to be an oversight. It could be simply a unknown failure mode, which no amount of 'oversight' would have detected. No design of this complexity is perfect.

Online abaddon

  • Senior Member
  • *****
  • Posts: 3176
  • Liked: 4167
  • Likes Given: 5624
Hopefully SpaceX has been able to move forward with some of the "many items" that remained between DM-1 and DM-2 prior to the test article explosion.  This seems plausible given how much stuff there is in the capsule that isn't related to the engines/plumbing/whatever is implicated in the accident.  It seems likely some of the delay due to this accident would have occurred anyway due to those other work items remaining.
« Last Edit: 06/19/2019 02:07 pm by abaddon »

Offline woods170

  • IRAS fan
  • Senior Member
  • *****
  • Posts: 12196
  • IRAS fan
  • The Netherlands
  • Liked: 18496
  • Likes Given: 12573
Hopefully SpaceX has been able to move forward with some of the "many items" that remained between DM-1 and DM-2 prior to the test article explosion.  This seems plausible given how much stuff there is in the capsule that isn't related to the engines/plumbing/whatever is implicated in the accident.  It seems likely some of the delay due to this accident would have occurred anyway due to those other work items remaining.

Rest assured. SpaceX has continued working on most of the items that remained open between DM-1 and DM-2. Only a limited number of people was temporarily reassigned to help out with the anomaly investigation.

Offline FlattestEarth

  • Full Member
  • **
  • Posts: 201
  • Usa
  • Liked: 147
  • Likes Given: 76
Nice satellite image of the area, is this where the test was carried out?

https://mobile.twitter.com/Maxar/status/1144331933788364801

Offline FutureSpaceTourist

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 50841
  • UK
    • Plan 28
  • Liked: 85434
  • Likes Given: 38218
Cross-posting due to potential SpaceX update:

Eric is usually well-informed:

twitter.com/SciGuySpace/status/1145677058821021703

Quote
Here are a couple of things I think I know about commercial crew this morning.

1. NASA will do well to get Boeing's uncrewed test flight, and SpaceX's in-flight abort test done in 2019. Crewed flights are not entirely off the table, but unlikely.

https://twitter.com/SciGuySpace/status/1145677592579715075

Quote
2. SpaceX has been working well with NASA after April's Crew Dragon explosion in Florida. Two sources confirm issue is not with Super Draco thrusters, and probably will cause a delay of months, rather than a year or more.

Offline Norm38

  • Full Member
  • ****
  • Posts: 1724
  • Liked: 1287
  • Likes Given: 2349
“Issue is not with the Super Draco thrusters” just means the engines themselves?  And not the whole fuel system?  It would be nice to know if the tanks, valves and plumbing are still under consideration. I wonder if they’ve been able to narrow it down yet?

Online Vettedrmr

  • Full Member
  • ****
  • Posts: 1686
  • Hot Springs, AR
  • Liked: 2287
  • Likes Given: 3430
“Issue is not with the Super Draco thrusters” just means the engines themselves?

Just the thrusters, IMO.  Problem is most likely in the plumbing, tankage, etc.  My guess is that SpaceX/NASA know the whole story, but they're not going to release anything until they release everything.

Have a good one,
Mike
Aviation/space enthusiast, retired control system SW engineer, doesn't know anything!

Offline vulture4

  • Full Member
  • ****
  • Posts: 1101
  • Liked: 431
  • Likes Given: 92
Fwiw the initial small, 2m diameter fireball was centered on a panel which covers a junction of fuel lines and valves rather than the propellant tanks or thrusters per se. Presumably at least some of these lines were abruptly pressurized at about the time of the explosion, just prior to the SD firing.

Offline SWGlassPit

  • I break space hardware
  • Full Member
  • ****
  • Posts: 852
  • Liked: 902
  • Likes Given: 142
Fwiw the initial small, 2m diameter fireball was centered on a panel which covers a junction of fuel lines and valves rather than the propellant tanks or thrusters per se. Presumably at least some of these lines were abruptly pressurized at about the time of the explosion, just prior to the SD firing.

Huh.  Wonder if there was a water hammer thing going on...  Those can sometimes show up in surprising ways.

Offline su27k

  • Senior Member
  • *****
  • Posts: 6414
  • Liked: 9104
  • Likes Given: 885
Bridenstine is still not too happy about the communication issue: https://spacenews.com/bridenstine-says-leadership-changes-linked-to-urgency-in-nasas-exploration-programs/

Quote
SpaceX suffered the loss of that Crew Dragon spacecraft in April during preparations for an in-flight abort test. Both the company and the agency faced criticism for the lack of openness in the ongoing investigation into that incident, and Bridenstine vowed that the process will work differently in the future.

“That criticism largely comes from me as well,” he said, noting there was “no communication” from SpaceX immediately after the accident. “That can’t happen again.”

Bridenstine said that a new process is now in place for communications in the event of another mishap. “Within a couple of hours, we’re going to do a press conference and get as much information out to the public as soon as possible.”

Offline mmeijeri

  • Senior Member
  • *****
  • Posts: 7772
  • Martijn Meijering
  • NL
  • Liked: 397
  • Likes Given: 822
Is he also still unfazed about the earlier Boeing mishap that wasn't communicated either?
Pro-tip: you don't have to be a jerk if someone doesn't agree with your theories

Offline rockets4life97

  • Full Member
  • ****
  • Posts: 800
  • Liked: 538
  • Likes Given: 367
Bridenstine is still not too happy about the communication issue: https://spacenews.com/bridenstine-says-leadership-changes-linked-to-urgency-in-nasas-exploration-programs/

Quote
SpaceX suffered the loss of that Crew Dragon spacecraft in April during preparations for an in-flight abort test. Both the company and the agency faced criticism for the lack of openness in the ongoing investigation into that incident, and Bridenstine vowed that the process will work differently in the future.

“That criticism largely comes from me as well,” he said, noting there was “no communication” from SpaceX immediately after the accident. “That can’t happen again.”

Bridenstine said that a new process is now in place for communications in the event of another mishap. “Within a couple of hours, we’re going to do a press conference and get as much information out to the public as soon as possible.”

It seems Bridenstine means communication with the public. It's been previously reported there was lots of communication immediately between SpaceX and NASA.

I'm a bit ambivalent about communication with the public for tests failures. Most folks in the public don't seem to have a proper appreciation for the role of failure in tests.

Offline Robotbeat

  • Senior Member
  • *****
  • Posts: 39364
  • Minnesota
  • Liked: 25393
  • Likes Given: 12165
Bridenstine is still not too happy about the communication issue: https://spacenews.com/bridenstine-says-leadership-changes-linked-to-urgency-in-nasas-exploration-programs/

Quote
SpaceX suffered the loss of that Crew Dragon spacecraft in April during preparations for an in-flight abort test. Both the company and the agency faced criticism for the lack of openness in the ongoing investigation into that incident, and Bridenstine vowed that the process will work differently in the future.

“That criticism largely comes from me as well,” he said, noting there was “no communication” from SpaceX immediately after the accident. “That can’t happen again.”

Bridenstine said that a new process is now in place for communications in the event of another mishap. “Within a couple of hours, we’re going to do a press conference and get as much information out to the public as soon as possible.”

It seems Bridenstine means communication with the public. It's been previously reported there was lots of communication immediately between SpaceX and NASA.

I'm a bit ambivalent about communication with the public for tests failures. Most folks in the public don't seem to have a proper appreciation for the role of failure in tests.
Keep in mind Bridenstine is a politician. That has helped him in some ways, but it also means he has an instinct with what plays well in the public eye. One of the favorite bipartisan pastimes of Congress, for instance, is calling up someone to testify and grill them. Asking tough questions, fair or not, looks good on TV.
Chris  Whoever loves correction loves knowledge, but he who hates reproof is stupid.

To the maximum extent practicable, the Federal Government shall plan missions to accommodate the space transportation services capabilities of United States commercial providers. US law http://goo.gl/YZYNt0

Tags:
 

Advertisement NovaTech
Advertisement Northrop Grumman
Advertisement
Advertisement Margaritaville Beach Resort South Padre Island
Advertisement Brady Kenniston
Advertisement NextSpaceflight
Advertisement Nathan Barker Photography
1