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#460
by
generic_handle_42
on 15 May, 2009 22:27
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Q: Is there a sense that things have been building to tomorrow?
A: I expect tomorrow to be "hold your breath moment", but every day has been that so far. Points to the complexity of the observatory. Can't take anything for granted. This is the first instrument repair in space. Any time trying something brand new, the stakes are high, it is "hold your breath time".
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#461
by
generic_handle_42
on 15 May, 2009 22:29
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Q: Schedule adjustments, is this mission more intense than other Servicing Missions?
A: Always hope that it goes well, can hit road bumps. We're always ready for those when we develop EVA timelines. Try to be as efficient as possible, hope telescope will cooperate.
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#462
by
generic_handle_42
on 15 May, 2009 22:31
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Q: Short time where Mass's radio didn't work, what was that about?
A: May have bumped comm switch, changing frequencies. If he hadn't caught that, he is trained to go to airlock and go to hardline, or translate to window, and communicate by writing on paper.
Q: When Bueno took out RSU, he commented that it looked "banged up"
A: Past history shows it takes several attempts to get it seated properly. That was the issue.
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#463
by
generic_handle_42
on 15 May, 2009 22:35
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Q: Since 2 EVAs compressed tomorrow, isn't there additional time elsewhere? If ACS repairs take longer, is there room to finish up elsewhere?
A: We want to finish mission with at least one repaired instrument. If ACS is well along in the repair process, and the next repair doesn't work, ACS will jump in priority. If ACS works just fine, the other repair will drop in priority. Performing more repairs on later EVAs will require looking at spacecraft rotation issue to get access to those instruments.
Tomas: Both instruments at same priority right now, shooting to get ACS done in one day. Have an alternate EVA-5 if both instrument repairs do not work on the first try.
Follow-up: Already 2 hours over EVA time. Is there a limit how much you can go over with back to back EVAs?
A: No, no limit. It is evaluated each day after the EVA. Good news is crews switch each day. Surgeons talk to them every day. Will not take risks if they don't feel okay.
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#464
by
generic_handle_42
on 15 May, 2009 22:41
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Follow-ups at JSC:
Q: Update on FES and how long would you let them go (EVA time)? And how has John done time-wise during training?
A: Know that a 7 hour EVA will not affect post-EVA activities, know that almost 8 hours will, so we added an hour. We plan to 6.5 hours so we have some wiggle room. HST tasks not 5-10 minute jobs. Once you start you need to finish even if you go over time.
A (FES): Worked well the last couple days, possible core is frozen. Put some copper heaters on. Hadn't gotten there yet when I left, but we have backup system.
A (Timeline): John has gotten it done in the pool. ACS wasn't designed to be fixed during EVA, accounted for additional time for that. Have been conservative in timeline estimates, in case things get jammed. If everything goes smoothm John can finish in under 6.5 hours.
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#465
by
generic_handle_42
on 15 May, 2009 22:44
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Follow-ups
Q: ACS Aliveness test, does it take longer? Excitement level for tomorrow.
A: Don't recall exact time for aliveness, probably similar to other instruments. Baselined for 10-15 minutes while astronaut is present.
A (COS): COS is most sensitive spectrograph ever to fly. Not as fancy as a camera, but very precise. COS focusing on UV spectrum. COS is very sensitive. Specs don't get respect that cameras get.
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#466
by
generic_handle_42
on 15 May, 2009 22:46
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Last question: Other RSUs fit, maybe a problem with unit 007? Any indication of this in the past with 007? How much did the unit cost?
A: Nothing in the contract that says taxpayers get money back
They are built to very tight tolerances. Can find it challenging to install. If we had more time, maybe it would have worked.
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#467
by
generic_handle_42
on 15 May, 2009 22:46
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#468
by
mtakala24
on 15 May, 2009 22:48
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phew, rob navias really is a robot (very, very long ending notes on the briefing.)
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#469
by
robertross
on 15 May, 2009 22:49
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Thanks for the covergae Nick! Great job.
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#470
by
Chris Bergin
on 15 May, 2009 22:49
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Nice work Nick.
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#471
by
generic_handle_42
on 15 May, 2009 22:51
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Nice work Nick.
Thanks, it's finger stretching time now!
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#472
by
generic_handle_42
on 15 May, 2009 22:53
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PAO reports core flush of FES seems to be having results.
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#473
by
Journeyman
on 16 May, 2009 00:09
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Question regarding the ACS repair. Why do they replace the cards with the ACS still inside Hubble? Wouldn't it be easier to get access to the ACS if they first remove the instrument and replace the cards while it is outside of Hubble? Then when the job is finished they just slide it back inside Hubble.
I know that there is a good reason why NASA do it this way, i just cant figure it out.
My first post/question after 1 year of reading so forgive me if this is posted in the wrong thread.
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#474
by
MKremer
on 16 May, 2009 00:25
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Question regarding the ACS repair. Why do they replace the cards with the ACS still inside Hubble? Wouldn't it be easier to get access to the ACS if they first remove the instrument and replace the cards while it is outside of Hubble? Then when the job is finished they just slide it back inside Hubble.
I know that there is a good reason why NASA do it this way, i just cant figure it out.
My first post/question after 1 year of reading so forgive me if this is posted in the wrong thread.
Likely because there's the risk of screwing up the optical alignment of the mirrors (which is critical) or even damage to one of the mirrors or mirror supports during removal or reinstallation.
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#475
by
Ford Mustang
on 16 May, 2009 00:39
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Payload Bay forward port floodlight is deemed failed. Just an update.
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#476
by
robertross
on 16 May, 2009 00:44
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Question regarding the ACS repair. Why do they replace the cards with the ACS still inside Hubble? Wouldn't it be easier to get access to the ACS if they first remove the instrument and replace the cards while it is outside of Hubble? Then when the job is finished they just slide it back inside Hubble.
I know that there is a good reason why NASA do it this way, i just cant figure it out.
My first post/question after 1 year of reading so forgive me if this is posted in the wrong thread.
Welcome on board!
Some other reasons for doing the repair inside Hubble is
1) To shield the repair from the varying thermal environment going from day/night/day.
2) The lighting can be more uniform by using the EVA's helmet lights & visor up instead of messing with all that in the middle of an exposed card carrier.
3) Reduced mmod risk by using Hubble as a shield.
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#477
by
Journeyman
on 16 May, 2009 22:52
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Thanks for the great answers! I have been trying to ask a clever question for 1 year or so, this was the first time i had a question that i could not find an answer already posted by another member!
This is what makes NasaSpaceflight.com the best spaceflight site on the planet! You know that a forum is great when all your questions gets answered even before you ask them!
