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#160
by
MKremer
on 14 Sep, 2006 02:34
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DaveS - 13/9/2006 8:34 PM
MKremer - 14/9/2006 3:02 AM
If being out of alignment would have caused an immediately detectable problem, the first 5 degree move, then the long pause, then the rest of the 180° rotation would have had them scrambling right away. Didn't happen.
Actually, there's two Drive Lock Assemblies(DLAs). For those two initial movements they only used one of the DLAs. When they tried to do a full 360 using the other DLA, the SARJ didn't move and the DLA gave a out of alignment reading.
Which is what I was saying.
The DLAs are part of the motor drive for the truss.
When they were both commanded locked today, no problem detected. When #1 was commanded to engage and run (5° turn, then 175° turn) and the other unlocked, no problem. When #2 commanded to engage and run, big problem.
If troubleshooting C&C and other sensors on both didn't show a fault before, but #2 did when commanded to turn (according to PAO, a suspected alignment fault), the first obvious step after visual inspection would be to re-align/reseat then check operation again.
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#161
by
nathan.moeller
on 14 Sep, 2006 02:40
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Home movies goin' again and again...has anyone heard anything about the SARJ issue?
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#162
by
daveglo
on 14 Sep, 2006 02:45
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PAO just annouced that the DLA was engaged, engineers readying for testing.
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#163
by
vt_hokie
on 14 Sep, 2006 02:48
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Fingers crossed...
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#164
by
nathan.moeller
on 14 Sep, 2006 02:51
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Woohoo! How long 'til they start? I've been missing commentary because we've got projects goin' here.
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#165
by
Joffan
on 14 Sep, 2006 02:52
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With regard to my earlier remark about taking the arm over to have a look at the SARJ, it looks from the control centre graphic as though that's exactly where it is (although of course it's probably just stayed there ever since P3/4 was mounted up).
With the DLA#2 engaged, I'm guessing they're going to try some minimal moves first and then switch back between DLAs a few times to regain confidence.
Of course they might wait for sunrise before doing anything - although I'm not sure of any benefit
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#166
by
daveglo
on 14 Sep, 2006 02:53
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No annoucement yet, but they interrupted FD5 highlights to break in with the news, and the camera view is P3/P4 live.
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#167
by
daveglo
on 14 Sep, 2006 02:57
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PAO said it was a "software commanding issue". Testing program GO to resume. Continuing full program, including panel deployment.
No rotation yet. . . .
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#168
by
nathan.moeller
on 14 Sep, 2006 03:03
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How long until sunrise (if they are in fact waiting)?
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#169
by
daveglo
on 14 Sep, 2006 03:06
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Sunrise in progress . . . no word on intentions, but camera view firmly on P3/P4.
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#170
by
MKremer
on 14 Sep, 2006 03:12
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daveglo - 13/9/2006 9:44 PM
PAO said it was a "software commanding issue". Testing program GO to resume. Continuing full program, including panel deployment.
Sheesh, I wish they'd make up their minds - first drive/alignment/hardware, then s/w
(yes, I keed!)
If it's s/w c&c, that would be wonderful (means it can much more easily be fixed).
They may still have EVA-3 check the suspect DLA/motor, though, if it's not resolved by tomorrow, I would think.
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#171
by
Norm Hartnett
on 14 Sep, 2006 03:28
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They may be waiting for crew wake up, in about an hour, while they think about it.
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#172
by
jacqmans
on 14 Sep, 2006 03:30
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#173
by
nathan.moeller
on 14 Sep, 2006 03:32
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Norm Hartnett - 13/9/2006 10:15 PM
They may be waiting for crew wake up, in about an hour, while they think about it.
Merry Christmas morning kids! No solar arrays from Santa today!
I'm still a little confused why they had the spacewalkers out when they deployed the arrays on STS-97. Was it because the cells stuck and they had to wait until Tanner was out there to go fix it? May be a dumb question but I'm curious.
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#174
by
MKremer
on 14 Sep, 2006 03:34
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Orientation - we're looking from one of Atlantis' cameras, from below the station, toward zenith.
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#175
by
daveglo
on 14 Sep, 2006 03:34
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Well, if they were waiting for daylight, they've got as much as they're gonna get. I think they're waiting for the "A" team to come back on shift, assuming they're on console at the same time that the crew is awake.
Camera occasionally flips to MCC. I picture some poor NASA tech randomly pushing a button on the director's console every now and then, fighting to stay awake . . .
Maybe he/she is also reading this forum! In that case: Hey, how about a view of P3/P4 that includes Earth in the background? Please?
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#176
by
nathan.moeller
on 14 Sep, 2006 03:36
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daveglo - 13/9/2006 10:21 PM
Camera occasionally flips to MCC. I picture some poor NASA tech randomly pushing a button on the director's console every now and then, fighting to stay awake . . .
Funny! Yeah these folks definitely have long hard work days. I'm falling asleep just keeping up with this thread. What's a normal work day for the MCC techs and PAOs?
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#177
by
nathan.moeller
on 14 Sep, 2006 03:38
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So is the OBSS gonna be berthed for the remainder of the flight?
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#178
by
MKremer
on 14 Sep, 2006 03:39
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nathan.moeller - 13/9/2006 10:19 PM
I'm still a little confused why they had the spacewalkers out when they deployed the arrays on STS-97. Was it because the cells stuck and they had to wait until Tanner was out there to go fix it? May be a dumb question but I'm curious.
First time for array deployment. They didn't have much of a clue how they would actually deploy in space, as it turned out, plus doing it during an EVA would have someone available for contingincies in case one or both array deployments failed (as in the actual deployment hardware).
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#179
by
leclaire
on 14 Sep, 2006 03:41
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(yes, I keed!)