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07 Nov 2025, 18:33 [ UTC - 5; DST ]


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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 02 Aug 2024, 10:32 
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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 02 Aug 2024, 10:35 
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ASA says it is “evaluating all options” for the safe return of Starliner crew
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One informed source said it was greater than a 50-50 chance that the crew would come back on Dragon. Another source said it was significantly more likely than not they would. To be clear, NASA has not made a final decision. This probably will not happen until at least next week. It is likely that Jim Free, NASA's associate administrator, will make the call.
I read somewhere that the space station is running low on food.


I don't know about the food, but the underlying problem they're about to have is that there aren't enough parking spaces.

Here's a map of what's currently docked.

There are 2 docking ports that can accommodate US-spec modules. They're both full. They can't send up Crew-9 (currently scheduled for no earlier than 18 August) until they free up one of those two. Starliner is on one, and the Crew-8 Dragon is on the other. They can't undock Crew-8 because that would leave insufficient crew return seats for an emergency evacuation. They can't undock Starliner because, well, vague handwave.

NASA could let Starliner autonomously re-enter and fly Butch and Suni home with the Crew-8 guys. But pretty soon they're going to start pushing Crew-9 to the right if they don't make up their minds. I hope that doesn't lead to get-there-itis.


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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 02 Aug 2024, 13:50 
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Username Protected wrote:
There are 2 docking ports that can accommodate US-spec modules. They're both full.

I know a guy out of docking bay 94 who might be up for the job...


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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 02 Aug 2024, 16:58 
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I read somewhere that the space station is running low on food.

Oh my.

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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 12:06 
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Three separate, well-placed sources have confirmed to Ars that the current flight software on board Starliner cannot perform an automated undocking from the space station and entry into Earth’s atmosphere.


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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 16:14 
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Three separate, well-placed sources have confirmed to Ars that the current flight software on board Starliner cannot perform an automated undocking from the space station and entry into Earth’s atmosphere.

:lol:

I wonder when they would have figured that out if the thrusters hadn't left them stuck. Or, is that a planned "feature"?

Boeing. :rofl:

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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 16:27 
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Three separate, well-placed sources have confirmed to Ars that the current flight software on board Starliner cannot perform an automated undocking from the space station and entry into Earth’s atmosphere.

:lol:

I wonder when they would have figured that out if the thrusters hadn't left them stuck. Or, is that a planned "feature"?

Boeing. :rofl:

I assumed it meant that they need a human onboard to complete re-entry. It wouldn't surprise me to learn that Boeing's design was a bit less automated than the Dragon.
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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 17:31 
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The current software was capable of an automated flight and docking, arguably more difficult than undocking and entry. Yes, Boeing may have just assumed that the crew would manually perform those functions, but really, is that a good idea? Even just as a back up I'd expect the vehicle to be capable of autonomous operation.

If it were a different company I might be inclined to think that there was a conscious, purposeful reason for it, but it's not, it's Boeing.

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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 17:34 
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Would you really want a software glitch to undock the Starship by itself?


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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 17:37 
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Would you really want a software glitch to undock the Starship by itself?

I would expect that a competent company <cough>SpaceX</cough> would design the spacecraft and its software in such a way that it was free of "glitches" and sufficiently redundant that it could work autonomously. Dragon does it all the time.

At this point there may be a few people wishing that it would just undock itself and go away.

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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 18:00 
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Would you really want a software glitch to undock the Starship by itself?

I would expect that a competent company <cough>SpaceX</cough> would design the spacecraft and its software in such a way that it was free of "glitches" and sufficiently redundant that it could work autonomously. Dragon does it all the time.

At this point there may be a few people wishing that it would just undock itself and go away.

Heck, even the Apollo Guidance Computer's software had a tremendous amount of redundancy and the version used for the Lunar Lander saved the day (and the astronauts) by repeatedly and seamlessly rebooting several times during final descent to the moon during the Apollo 11 mission.
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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 21:04 
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Lance, if I recall the overflow was because Buzz decided he knew better and left both the landing and rendezvous radar on at the same time. Had the system been used properly the overflow would not have taken place


Username Protected wrote:
I would expect that a competent company <cough>SpaceX</cough> would design the spacecraft and its software in such a way that it was free of "glitches" and sufficiently redundant that it could work autonomously. Dragon does it all the time.

At this point there may be a few people wishing that it would just undock itself and go away.

Heck, even the Apollo Guidance Computer's software had a tremendous amount of redundancy and the version used for the Lunar Lander saved the day (and the astronauts) by repeatedly and seamlessly rebooting several times during final descent to the moon during the Apollo 11 mission.

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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 21:24 
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Lance, if I recall the overflow was because Buzz decided he knew better and left both the landing and rendezvous radar on at the same time. Had the system been used properly the overflow would not have taken place


This in incorrect.

This was just what CBS news reported because complex issues are just too hard. They essentially made it up.

Both astronauts followed the checklists correctly and the RR was in AUTO per the landing checklist. (Originally the thought was that they could track angles on Columbia during the descent but this was abandoned. Programming was not changed and neither was the checklist. The interface between the RR and the computer was not fully understood at the time.)

At some point in time Aldrin said he left it in auto in case there was an abort but it was on the checklist to be in AUTO so he would have had to go cowboy to put it in SLEW or OFF.

Here are a couple of papers that explain the issue.

https://ibiblio.org/apollo/Documents/Ch ... egesis.pdf

This white paper covers this subject in its entirety.

https://www.doneyles.com/LM/Tales.html

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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 05 Aug 2024, 21:31 
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The current software was capable of an automated flight and docking, arguably more difficult than undocking and entry. Yes, Boeing may have just assumed that the crew would manually perform those functions, but really, is that a good idea? Even just as a back up I'd expect the vehicle to be capable of autonomous operation.

If it were a different company I might be inclined to think that there was a conscious, purposeful reason for it, but it's not, it's Boeing.

In theory it was capable of automated docking, but in the face of the thruster failures it didn't work, and had to be done manually by Butch.


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 Post subject: Re: Boeing Starliner: 80 Problems
PostPosted: 06 Aug 2024, 09:05 
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Yes, but on a prior uncrewed test flight it flew, docked, undocked, and returned to Earth autonomously. The code was there then. Why isn’t it there now?

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