Spaceflight

625 readers

24 users here now

Your one-stop shop for spaceflight news and discussion.

All serious posts related to spaceflight are welcome! JAXA, ISRO, CNSA, Roscosmos, ULA, RocketLab, Firefly, Relativity, Blue Origin, etc. (Arca and Pythom, if you must).

Other related space communities:

Related meme community:

!spaceflightmemes@sh.itjust.works

founded 1 year ago

MODERATORS

threelonmusketeers@sh.itjust.works

llamacoffee@lemmy.world

NASA knew that Boe-CFT Starliner couldn't return autonomously without significant delay (youtu.be)

submitted 3 months ago by ptfrd@sh.itjust.works to c/spaceflight@sh.itjust.works

2 comments fedilink hide all child comments

A Youtuber called Ellie in Space claims that a NASA source sent her the following message. It was in response to a question about when NASA knew that the Boe-CFT mission's Starliner vehicle would not be able to undock and return to Earth autonomously without being reconfigured.

So if you want to know when??? Well always, but it wasn't a reasonable consideration to retain the unmanned Starliner capsule software to work in the manned version of the capsule as a contingency. Would you call that a mistake?? Maybe, but let's think about the need to really ever plan to send folks up to space and leave them there with no way to fly home... they would always chose to risk the ride vs having no way home.

No one really considered this very unique and dynamic situation would happen.

Background

I believe this issue was first brought to light by Eric Berger.

Regardless, sources described the process to update the software on Starliner as "non-trivial" and "significant," and that it could take up to four weeks. This is what is driving the delay to launch Crew 9 later next month.

A couple of days later, NASA held a press teleconference in which they emphasized that what was needed was merely a "data load", not a software change. But they indicated timelines that do seem consistent with the "up to four weeks" claim by Berger's source.

My questions

Aren't there several realistic scenarios where you'd want to undock a crew vehicle, without its crew (or at least without them being in a fit state to operate the vehicle), in less than 4 weeeks?

Can Crew Dragon do it? Soyuz?

top 2 comments

sorted by: hot top controversial new old

[–] ptfrd@sh.itjust.works 7 points 3 months ago

Aren’t there several realistic scenarios ...

Scenario 1

Emergency on board ISS. 1) One aspect of the emergency (e.g. noxious air) has incapacitated many of the crew, including all the ones trained to operate Starliner. 2) Another aspect of the problem (e.g. electrical faults that are expected to lead to fire) leaves no doubt that evacuation is essential.

Those ISS crew who managed to don emergency breathing apparatus quickly enough now move the incapacitated Starliner crew to their seats, strap them in and exit Starliner (closing the hatches on their way out), before proceeding to their own vehicle(s).

Scenario 2

Serious MMOD strike upon a docked vehicle, causing damage that makes it very unlikely to be safe for its crew to return in, and also at significant risk of posing a danger to the ISS.

Wouldn't the least bad option be to command an uncrewed undocking and hope for the best?

Scenario 3

During a flight test, a spacecraft is able to dock with ISS, but only after encountering significant problems. The first job of engineers is to consider whether it is sufficiently safe for the crew to return to Earth in, in the event of an emergency. Their decision is either 'no', or 'barely'.

An alternative provider of crewed LEO access services, known for its proficiency and speed of operations, announces that they will be able ready to send a replacement vehicle by the time of a suitable launch opportunity in 4 days' time.

There are no spare docking ports.

[–] ptfrd@sh.itjust.works 1 points 3 months ago* (last edited 3 months ago)

Scenario 4

Well, consider various lesser versions of Scenario 1. What if the crew was only partially reduced in their capabilities?

Perhaps they were both suffering from the symptoms of carbon monoxide poisoning (including headaches, dizziness, and confusion). Or perhaps one was serously injured, and the other was fine but needed to focus all her attention on tending to her crewmate?

Then it would come down to the question of just how complex and time-consuming the required manual step(s) are. If there's just a big red button that says "TAKE US HOME" then, it shouldn't be a problem. But we don't know.

And if there was just a big red button, couldn't they try bypassing the current 4-week delay, by coming up with some ways of pressing it without humans on board? ;) Shove an astrobee in there and give it a try. If it doesn't work, no harm done ...