ptfrd

as far as I’m aware, they’ve done 1 EVA to look at the thing

Don't think so.

They do have access to camera imagery, but as you say, most problems like this probably need much more intrusive investigation.

A landing leg failure, for example, likely could be quickly cleared because it is not used in other phases of flight

I assume SpaceX wouldn't make any big assumptions along these lines though?

I imagine, for example, that a worn component that could fail catastrophically on landing might also be at risk of some kind of failure during max Q, in a way that affects the primary mission.

Of course, there could come a point where you judge that so unlikely as to be not worth wasting any (further) time on.

But as an armchair observer I'm fairly glad to see a pause at this point before Polaris Dawn, even just a couple of days ...

“We’re just focused on recovery weather at this point,” he said after the announcement of the FAA investigation into the booster landing anomaly. “I think that is still gate to our launch.”

Surprising. Does this mean they have good reason to think they'll get a Public Safety Determination in a matter of days? Does the FAA work weekends?

P.S. If a landing leg realistically could, say, pop open at max Q, I guess that further strengthens the argument in favour of rocket 'catchings' rather than rocket landings!

the host says they’re going to higher altitudes than the Apollo program

Ah, yes, well normally that would be my opportunity to remind people of Gell-Mann amnesia.

But this time it’s unfair to the host. Isaacman has made that mistake himself on (I think) multiple occasions. She might have got it from him. (Perhaps indirectly.) Here’s one: https://youtu.be/aASZ2rKdS6I?t=1m2s (He meant “since”, not “than”.)

One source of confusion might be if this crew is planning to be in the highest 'free' orbit of Earth ever occupied by humans. Where I'm using 'free' as a vague way of trying to exclude, for example, the astronauts who were actually on the moon (which is of course orbiting the Earth).

Is that a scientifically/technically legitimate & meaningful distinction? If so, is there a better term for it?

the host says they’re going to higher altitudes than the Apollo program

Ah, yes, well normally that would be my opportunity to remind people of Gell-Mann amnesia.

But this time it's unfair to the host. Isaacman has made that mistake himself on (I think) multiple occasions. She might have got it from him. (Perhaps indirectly.) Here's one: https://youtu.be/aASZ2rKdS6I?t=1m2s (He meant "since", not "than".)

this one doesn’t really have anything that makes it fundamentally unsafe.

You're probably right, but we'll see. The altitude and the spacewalk are the first big new initiatives for SpaceX's human spaceflight work that haven't been done under close NASA supervision. That's probably a good thing but ... I'm nervous.

Talking of the altitude, this is from the article:

The mission is scheduled to launch between 3:30 and 7 a.m. Eastern Aug. 26 in one of three instantaneous launch windows. Isaacman said the launch times were selected by SpaceX to minimize the micrometeoroid and orbital debris impact risk to the mission given its unconventional orbit.

He said it during the event (which is available to watch here), and I don't think any further explanation was given for why certain launch times are better than others for MMOD. Does anyone understand why? Is it obvious? Any resources I could check out to learn more?

Talking of the article, they still haven't fixed the first sentence!:

spacewalk on a is ready

If Jeff or anyone else from Space News is reading this, hire me as your proofreader!

Interesting title on the video about this, just uploaded to YT by CBS News: SpaceX sending private citizens on risky mission that includes spacewalk attempt

I find myself agreeing with the sentiment. I'm fairly nervous about this mission.

Don't get me wrong, I'd jump at the chance to join it. I'd choose it over a routine trip on Starliner, but not for the reason you might be thinking. ... I can't help wondering if Polaris Dawn is both higher risk and reward than a routine trip on Starliner.

No, that's this one, funded by a crypto billionaire, announced a week ago and launching in ~4 months.

Polaris Dawn is funded by a payments processing billionaire, announced 2.5 years ago, and launching this month.

That has to be a requirement regardless I guess since a depressurization could happen on any flight.

Yes, this has been pointed out by the crew (IIRC) in an interview about the mission. (Not to suggest that no work was needed on the issue, just less work than people might expect. Obviously it can be the case that taking an unlikely contingency scenario and making it a deliberate part of a mission, raises the level of assurance needed.)

In the implication here that it is Congress who want a diversity of suppliers, whereas NASA doesn’t care as much?

Yes, I think that's the implication. I realized it's not correct but decided to leave it like that. I'm a big picture kinda guy; someone else can sort out the details!

I guess it might be more like a combined NASA / Space Force high level strategic fund providing the subsidy. So that individual 'low level' programmes within NASA / Space Force then don't have to worry too much about the long term strategic goals like dissimilar redundancy, and can mostly just focus on their own needs.

If NASA decides to send Starliner back empty, it's a vote of no confidence in Boeing that may lead the company to cut its losses and withdraw from the program.

How would this work, contractually? Would they have to give back the whole $4.1 billion (or whatever)? And pay penalties on top to cover NASA's costs?

the most likely alternative would be to bring the astronauts back using SpaceX's Crew Dragon by removing two astronauts from the Crew-9 mission

The most likely? Not convinced. Wouldn't anyone removed from Crew-9 just be shifted to Crew-10? So it'd seem silly to announce Crew-10 only to have to change it a week later.

And even if they don't care about looking silly in that way, they might instead just go with one empty seat 'uphill' for each of Crew 9 and 10. Because that's a less drastic change to make to Crew 9 at such short notice.

But maybe I'm wrong. So, assuming the quoted scenario actually is what happens ...

I guess they'd have to keep the Russian (Gorbunov)?

And keep the capsule commander (Cardman)? But she's never been to space, so maybe the pilot (Hague)? I can't immediately see if he was expected to be the ISS commander, but if so, I guess that would give them a good excuse to 'promote' him over Cardman?

Wilson has had more launches than Hague (3 versus 2ish) but a lot less time in space, and I don't know if she would be as well trained for Dragon as the commander & pilot.

They say they really like Starliner, and I think they mean it. After all, it's not that bad! If you offered me a free trip to space in it, I'd jump at the chance.

In fact I'd offer to pay at least 1/3 of my net worth. (Sadly this doesn't quite equate to the current cost-per-astronaut of, what, $150m?)

Turns out that some of the later parts of the video I posted largely negated my above comment.

What do you think will happen to the other one? Do you think they’ll maintain a Florida splashdown capability indefinitely, as a backup

Question at 43:08.

43:56 "There may be a small transition period as we're moving vessels through the Panama Canal ... where we can support either Coast ..." (implying not indefinite)

e.g. in case of bad weather in all the new West Coast splashdown zones

51:15 "one benefit of moving to the West Coast is much better weather"

Also of interest ...

30:39. Sounds like they didn't bother with a Public Safety Determination in the end, and just went directly to full(?) approval.