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#100
by
DaveS
on 07 Sep, 2006 20:06
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As the FCs are located under the payload bay, FC R&R can only be done at the pad or in the OPF where the necessary GSE exists for opening the payload bay doors.
The VAB doesn't have it.
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#101
by
galileo
on 07 Sep, 2006 20:06
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nathan.moeller - 7/9/2006 2:45 PM
Yeah but I was under the impression that they'd do the changeout in the VAB.
You cant open the payload bay doors in the VAB....only in the OPF or at the Pad. So a VAB R&R is not an option. Its either do it at the Pad or destack Atlantis and roll her back to the OPF.
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#102
by
nathan.moeller
on 07 Sep, 2006 20:09
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Yet another dumb thought from Nate. Oh well. Let's hope they do it at the pad if they opt for a swapout!
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#103
by
Mark Dave
on 07 Sep, 2006 20:10
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If it can be done at the pad, then I'm happy with that. I at first thought if they had to change out a fuel cell, they have to bring the vehicle back, destack it, then start all over again after the change out. Whew, good news to me.
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#104
by
psloss
on 07 Sep, 2006 20:13
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MarkD - 7/9/2006 3:49 PM
Ok. I do recall once on an orbiter something was changed out in the aft compartment while in the VAB or at the pad, Endeavour I believe.
Not just once. There's a long history of it going back to the early flights.
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#105
by
Svetoslav
on 07 Sep, 2006 20:25
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A friend of mine said that the clock should be reset at t mines 11 hours. That means they should decide go or no go for tomorrow very soon, or they'll be too late.
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#106
by
gordo
on 07 Sep, 2006 20:27
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if the external airlock needs to come out for access , that sounds like it needs to be done in the OFP, therefore missing the oct window too.
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#107
by
Shuttle Man
on 07 Sep, 2006 20:32
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The length of the MMT decision is a bit worrying.
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#108
by
spaceshuttle
on 07 Sep, 2006 20:32
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Svetoslav - 7/9/2006 3:12 PM
A friend of mine said that the clock should be reset at t mines 11 hours. That means they should decide go or no go for tomorrow very soon, or they'll be too late.
yeah. they have to come up with a decision and quick because if the plan on launching on tomorrow, they need to do t-11 hours at AROUND 9:40pm (CST) or so...
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#109
by
psloss
on 07 Sep, 2006 20:34
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gordo - 7/9/2006 4:14 PM
if the external airlock needs to come out for access , that sounds like it needs to be done in the OFP, therefore missing the oct window too.
It doesn't.
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#110
by
gordo
on 07 Sep, 2006 20:37
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psloss - 7/9/2006 9:21 PM
gordo - 7/9/2006 4:14 PM
if the external airlock needs to come out for access , that sounds like it needs to be done in the OFP, therefore missing the oct window too.
It doesn't.
Fingers crossed then, but does sound like a bugger for access!
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#111
by
psloss
on 07 Sep, 2006 20:39
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gordo - 7/9/2006 4:24 PM
Fingers crossed then, but does sound like a bugger for access!
If they go down that road, hopefully Chris can do a write-up -- the L2 document on that is great.
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#112
by
edkyle99
on 07 Sep, 2006 20:41
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shuttle_buff - 7/9/2006 2:19 PM
I've watched all the briefings and understand enough about 3 phase motors but I'm still confused. Is one phase totally out or dropped out and is back?
Three phase motors can't run very long on only two phases (if one is out completely). The motor will overheat assuming this motor is running when one phase is lost. IN most cases, the motor can't event start itself if only two phases exist.
I heard a manager say the FC#1 runs fine so I'm totally confused?
They are thinking about opening the Phase A circuit breaker for the pump motor on purpose and letting the pump run on two phases only, the thinking being that they would isolate the problem to prevent it recurring on ascent. Perhaps the motor was designed to be able to run this way since NASA needed all kinds of built-in redundancy, etc., but I doubt it. Normal AC motors in normal use should never be run this way.
- Ed Kyle
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#113
by
Austin
on 07 Sep, 2006 20:43
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Shuttle Man - 7/9/2006 1:19 PM
The length of the MMT decision is a bit worrying.
I wouldn't read anything into the MMT meeting duration. If anything, I am encouraged by it. I am glad that they are having a thorough discussion here.
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#114
by
HKS
on 07 Sep, 2006 20:51
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edkyle99 - 7/9/2006 10:28 PM
They are thinking about opening the Phase A circuit breaker for the pump motor on purpose and letting the pump run on two phases only, the thinking being that they would isolate the problem to prevent it recurring on ascent. Perhaps the motor was designed to be able to run this way since NASA needed all kinds of built-in redundancy, etc., but I doubt it. Normal AC motors in normal use should never be run this way.
- Ed Kyle
Not at all a normal AC motor you plug into the outlet at home only uses 2 phases.
The motors NASA is using is certified to operate with only 2 phases.
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#115
by
Chris Bergin
on 07 Sep, 2006 20:54
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MMT Press Conference NET 5:30pm EDT (10:30pm UK) - meeting not concluded at this time.
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#116
by
rdale
on 07 Sep, 2006 21:05
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spaceshuttle - 7/9/2006 4:19 PM
yeah. they have to come up with a decision and quick because if the plan on launching on tomorrow, they need to do t-11 hours at AROUND 9:40pm (CST) or so...
According to my clock, that's still many hours away. And here in the US we use Daylight Saving Time - so that would be CDT
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#117
by
GLS
on 07 Sep, 2006 21:16
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T-11 hours and counting is in 1 hour 45 minutes from now (at 224500 GMT)
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#118
by
spaceshuttle
on 07 Sep, 2006 21:16
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rdale - 7/9/2006 3:52 PM
spaceshuttle - 7/9/2006 4:19 PM
yeah. they have to come up with a decision and quick because if the plan on launching on tomorrow, they need to do t-11 hours at AROUND 9:40pm (CST) or so...
According to my clock, that's still many hours away. And here in the US we use Daylight Saving Time - so that would be CDT
yeah. less than 6 hours from now. they still have quite a bit of time. they're scheduled to tell us the scoop at around 4:30 cst (i'll give'em 5:30 cst since they're reasonably not ready on time).
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#119
by
spaceshuttle
on 07 Sep, 2006 21:18
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GLS - 7/9/2006 4:03 PM
T-11 hours and counting is in 1 hour 45 minutes from now (at 224500 GMT)
SNAP! i forgot the holds...then they need to hurry the hell up if anything!
