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walk saw the successful addition of a

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new science instrument known as coss or

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cosmic origin spectrograph there was

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also complete success in an

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unprecedented on-orbit effort

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repair effort with the advanced camera

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for surveys

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both koss and acs have passed their

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aliveness test and cos has also passed

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its functional test

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a very pleased mission operations

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manager keith wallias shared his

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thoughts on the day shortly after his

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so today was the third eva day or third

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spacewalk day and this was what we

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thought was going to be our most

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challenging day especially with all the

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challenges the last few days we're

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really a little bit nervous you know the

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last few days it's been emotional

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because everything's been getting done

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but

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it's been tough you know we've had a

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problem with the rendezvous with the

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communication we had a problem with the

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wide field getting that camera out we

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had a problem getting the gyros in and

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these are things we've pretty much done

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before so we thought wow these are going

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to be pretty easy and here today had

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this amazingly challenging task so we

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were all

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cautious so then we started off cosmic

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origin spectrograph took out the old

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co-star

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and it was kind of a momentous point

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because this was the original fix for

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the aberration so even the astronaut

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john grunsfield he mentioned it he said

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wow this is kind of historic and he's

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right so this went perfectly they took

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it out put in the new instrument without

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a hitch we tested it we did our

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aliveness test everything worked

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perfectly right now actually in the

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middle of the functional test making

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sure that

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all of the detailed functions of this

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work but we know it has power the base

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functions work now let's just play with

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it and make sure it works right and the

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next was this advanced camera for

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surveys and this is complicated again

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it's not just going in and taking out

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one and putting another they had to go

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in they cut through a mesh grid they had

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to go inside they had to take out four

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different cards put in a replacement for

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it

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different tools to make this easier but

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they made it look easy

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we thought it was going to take a lot

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longer than it took they actually got

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done in less an hour less time than we

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expected he was so far ahead he was so

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well trained he did such a fantastic job

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it was just a feeling of euphoria in the

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when you think of where we were just

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three days ago to where we are now we

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have new batteries we have new gyros we

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have a new science handling computer we

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have a new wide field camera we have a

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new cause instrument we have a fixed acs

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camera

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it's just amazing the different

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telescope you have now from three days

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ago we still have two more days to go

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tomorrow another challenge if you had

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asked me before the mission obviously

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the two hardest days we had were today

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and then tomorrow because once again we

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have one of these instruments a space

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telescope imaging spectrograph this was

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installed back in 1997 on our second

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servicing mission and it too had a

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problem a few years back and had a

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failure on it so once again we're going

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to repair

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done this before this mission and the

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other thing we need to do is put on this

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new outer blanket layer

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the outside of the telescope there's a

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mli this multi-layer installation that's

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been there since launch and that

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protects it from the harsh environment

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of space well it doesn't do that great a

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job protecting it from the harsh

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environment space over 19 years so

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therefore what we're going to do we're

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going to go and put basically this new

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outer blanket layers basically a big

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stainless steel cover on top of it so

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we'll slap that on we've done this in

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the past mission too we've put them on

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in other missions and it's worked great

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and then that's going to protect us for

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a long time for the future so the two

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big tasks for tomorrow repair space

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telescope imaging spectrograph and put

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on this new outer blanket layer to give

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us that thermal protection for the

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as keith mentioned the fourth spacewalk

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of the mission will involve another

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repair effort when the other pair of

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spacewalking astronauts mike massimino

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and mike good make their second venture

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into atlantis payload bay to repair the

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space telescope imaging spectrograph

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in august of 2004 there was a five volt

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power supply that drives the mechanisms

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on stiffs

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and it failed when that happened it

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basically meant that stis could not

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this was our first black hole hunter it

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confirmed for the first time the

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existence of a supermassive black hole

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in the center of a galaxy

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and it went on to make the first

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detection and chemical analysis of the

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atmosphere of a planet around another

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star we want to keep on doing that kind

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of work

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this is what's called a spectrograph

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what it does is spreads the light out

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into its different wavelengths

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that's really important if we want to

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learn about how fast an object is moving

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what it's made of what the

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pressure and temperature it's getting at

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the physics of what's going on up there

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in the universe

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you might well ask if we're going to fly

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a cosmic origin spectrograph that's the

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most sensitive spectrographic earthquake

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hubble why do we need to bother to to

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repair the space telescope into the

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spectrograph

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do a number of things that cos can't do

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and conversely between the cosmic origin

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spectrograph that's very fast and very

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efficient

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and the space telescope imaging

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spectrograph that provides finer

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resolution and a smoother cut as it were

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through the light from the star or

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galaxy and you have a much more complete

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set of tools to use for a variety of

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it was huge motivation to recover stiffs

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so our engineers embarked on one of

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these rapid development programs and

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this this failure was

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very easily characterized we knew

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exactly what happened we knew exactly

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what card we knew exactly what compound

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and the challenge became can we get to

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it

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this

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particular activity that we're going to

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do to try to fix stis

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wasn't meant to be done in space it was

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meant to be done

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here on earth in a clean room now since

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no one ever expected this to happen when

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they sealed up this this instrument they

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sealed it up so it was nice and secure

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in fact there's 110 of these very small

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screws that we need to remove from the

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instrument in order to gain access to

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the board we need to replace

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and these screws are not what we call

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captive in other words as you take the

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screw out

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it's loose

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there's nothing holding it to the board

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the engineers here at goddard have been

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very creative in designing

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a cover plate that we can put on over

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top

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that as we take the screws out they'll

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be captured by this plexiglas cover we

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designed what's called the fastener

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capture plate

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it attaches onto the instrument

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it's got holes that the astronauts can

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access their tool into they're small

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enough for the tool bit but not large

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my job is going to be to drive each one

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of these screws

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remove that plate get inside of it and

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then remove a board much like you would

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remove a board in a computer in your

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house except for any fancy clothes a big

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fancy spacesuit we're using fancy tools

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to do it

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you want to make sure we do it right

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if we are going to go do

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exploration and continue with

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on-orbit assembly and test the

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spacecraft we've got to learn how to do

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that we've got to learn how to pull

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boards out and put boards in

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and so here we are you know hubble once

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the other planned activity during the

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fourth spacewalk is part of the effort

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of extending hubble's operational life

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in this case it is the installation of

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new thermal protection material known as

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we're going to install a new outer

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blanket layer called a noble which is a

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solid it's not a blanket anymore it's a

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solid sheet

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we designed a new outer blanket layer

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that can either lay on top of the

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degraded blankets

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just cover them up or we will take off

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the blanket in order to install a new

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radiator against the bay door and this

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is a very

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weather resistant new outer blanket

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layer that we have designed so it should

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not degrade

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appreciably for the next

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15-20 years

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so at the end of this servicing mission

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where we've installed new cameras and

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upgraded all of this infrastructure

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the whole point of this is that the

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hubble space telescope will be better

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than it's ever been in its history and

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will continue to produce this this

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breathtaking and amazing science well

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with almost 22 hours of space walking

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time already under their belt the

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sts-125 astronauts have already

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accomplished five of the top six mission

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science priorities

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we will now return to mission control in

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houston for continuing nasa television

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coverage of the flight of atlantis on

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the sts-125 mission

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up next on nasa tv will be the next