Gyro failed

http://www.chron.com/cs/CDA/ssistory...story2/2523944
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:
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My opinion is right

http://www.chron.com/cs/CDA/ssistory...story2/2523944

The good news is that they think they'll be able to repair the failed
CMG with a spacewalk, using spare parts they have on board.

Jim Kingdon wrote in
news
http://www.chron.com/cs/CDA/ssistory...story2/2523944

The good news is that they think they'll be able to repair the failed
CMG with a spacewalk, using spare parts they have on board.

Right. They have one bad CMG with a good power supply, and one good CMG
with a bad power supply. Between them, they can get one CMG back and
running.


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In article ,
says...
Jim Kingdon wrote in
news
http://www.chron.com/cs/CDA/ssistory...story2/2523944

The good news is that they think they'll be able to repair the failed
CMG with a spacewalk, using spare parts they have on board.

Right. They have one bad CMG with a good power supply, and one good CMG
with a bad power supply. Between them, they can get one CMG back and
running.

But, of course, one of the problems is that the area in which the CMGs
and their power units are located isn't very accessible via handholds
and tie-downs -- it almost needs the robot arm to provide a work
platform. And there won't be anyone inside to operate the arm to
position a work platform.

I'm sure they'll figure out a way to handle it -- after all, Skylab
wasn't designed for a little guy in a hard suit to tie a nylon rope to a
stuck solar panel and use his legs to pull it free (thus sending him ass
over teakettle out to the end of his tether). I guess I'm just a little
more concerned in this case -- without American suits for both guys
(which AIUI is the situation on ISS right now) there are no SAFERs, and
if someone kicks out too far or gets loose from their tether, ain't
nothing to be done but watch and listen as he floats near the ISS until
he dies...

Doug

Doug... wrote:
In article ,
says...
Jim Kingdon wrote in
news
http://www.chron.com/cs/CDA/ssistory...story2/2523944

The good news is that they think they'll be able to repair the failed
CMG with a spacewalk, using spare parts they have on board.

Right. They have one bad CMG with a good power supply, and one good CMG
with a bad power supply. Between them, they can get one CMG back and
running.

But, of course, one of the problems is that the area in which the CMGs
and their power units are located isn't very accessible via handholds
and tie-downs -- it almost needs the robot arm to provide a work
platform. And there won't be anyone inside to operate the arm to
position a work platform.

I'm sure they'll figure out a way to handle it -- after all, Skylab
wasn't designed for a little guy in a hard suit to tie a nylon rope to a
stuck solar panel and use his legs to pull it free (thus sending him ass
over teakettle out to the end of his tether). I guess I'm just a little
more concerned in this case -- without American suits for both guys
(which AIUI is the situation on ISS right now) there are no SAFERs, and
if someone kicks out too far or gets loose from their tether, ain't
nothing to be done but watch and listen as he floats near the ISS until
he dies...

Wouldn't it be possible to rendevous with the floater with the soyuz?
Can the soyuz equipment survive a few minutes of vacuum and someone
in a suit egress/enter through either of the hatches?

Right. They have one bad CMG with a good power supply, and one good CMG
with a bad power supply. Between them, they can get one CMG back and
running.

If I'm reading the articles right, they have multiple choices for
where to get a good power supply.

Four spare remote power control units are available on the station,
including one that is brand new.
http://spaceflightnow.com/station/exp9/040422gyro.html

That article also has a mention of some of the issues with the arm and
such.