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from nasa's goddard space flight center

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in greenbelt maryland this is the flight

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day 7 stock update report

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activities associated with sunday's

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spacewalk and the repair of the space

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telescope imaging spectrograph wound up

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testing both minds and muscles mission

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operations manager keith wally has

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provided a recap of flight day seven

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shortly after he finished his shift

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so today we had the fourth eva and

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hubble's personality is showing again it

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just seems like it's mad at us this is

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our last servicing mission so it's

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starting to act up so today we had two

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things on tap we're going to repair this

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this instrument the space telescope

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imaging spectrograph and then we're

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going to put on this outer blanket layer

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to repair some of the outside damage

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well it didn't go exactly as planned

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these this repair started off great the

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crew got going on it right on time and

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they started taking out all the

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different screws including 120 captive

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screws they were going to take out but

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while doing it one handle that was in

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place and it was

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in the way of the board that we were

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going to have to take off to get into

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the instrument

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wouldn't come loose try taking that

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screw off the crew tried different

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methods they changed the bits out and it

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just wouldn't work we spent a long time

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wrestling with this and i say wrestling

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literally wrestling with it because

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finally the solution to get this off was

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that that one screw that couldn't get

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out so the crew was going to pry this

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bar off

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and we tested it here at goddard

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actually we had a spare and we had a

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spare bar and we had some people here at

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goddard and they put this bar and they

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wrestled with it and they pulled it off

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and they saw how much force it could

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take and then they had the crew do that

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also and they told them you could do it

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crew did it fantastically mike massimino

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got it he wrestled it off

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and the rest of the repair went on we

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lost a lot of time he lost about an hour

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and a half doing that

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but it all got done it all got

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accomplished and i'm really happy to say

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that we now have this instrument working

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again we did our aliveness test and it's

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working perfectly so here just like last

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night with acs another instrument that

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was not working has now been repaired

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again

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it was a tough day because when you're

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seeing this you're hoping everything

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gets done everything gets accomplished

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and one of the results of that not

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happening was the fact that now this

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outer blanket layer won't get done until

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tomorrow but in the big scheme of things

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we have this incredible multi hundred

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million dollar instrument working again

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so

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99 success

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a little bit will have to defer until

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tomorrow but overall

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fantastic day

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so tomorrow is our final spacewalk day

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and it's the final chance we're going to

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get to work on hubble and we have two

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things actually three or four things

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planned the first big test that we have

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for the day is our batteries we have six

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batteries onboard hubble we earlier in

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the mission we changed out three of them

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and they're working fantastically but we

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have three more of those old 1990

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batteries on board so we need to change

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those out we expect it to go just as

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smoothly as it did the first day

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after we get the batteries changed out

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we'll have a whole compliment new

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complement of batteries will be set for

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many years to go the other task is the

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fine guidance sensor now these fine

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guidance sensors they give us that very

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accurate pointing accuracy in fact it's

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so accurate you could take a picture of

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a dime on top of the empire state

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building from washington dc it's

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incredible the accuracy and this is one

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of those instruments that gives us that

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capability

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at least about 900 pounds it's not small

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it's pretty big the size of a grand

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piano so that's going to happen tomorrow

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and then after that these outer blanket

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layers the outer layers that we have on

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the telescope of captain and teflon

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they've been peeling away over the years

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in fact you can see them just popping up

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we changed out four of them in the past

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on our critical electronic phase we want

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to get two more of them tomorrow and

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then we'll be set for the long term so

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it's still a full day we have a lot to

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do but we think we can still get it done

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so this instrument was one of those

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roller coasters just like the other day

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like we had with wide field like we had

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with the gyros it was really painful to

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watch to see mass struggling with that

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trying to get it done he just wanted to

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help him but there's so much we could do

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from our side and he did it he came

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through we got it done

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that's one of the feelings we have in

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the stock where no matter how bad it is

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we always believe that these guys are

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going to get it done and they do they've

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done it every single time and then when

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we had that aliveness test it was just

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that euphoric feeling again just like we

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had last night with acs an instrument

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that's been dead for a while it's

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working again and it's going to do super

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science again the future

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the fifth and final spacewalk of sts-125

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will focus on a trio of activities

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associated with extending hubble's

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operating life

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as keith mentioned first up for

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astronauts john grunsfeld and drew

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feustel we'll be installing the second

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battery module unit or bmu

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each battery module unit contains three

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batteries

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the first bmu was installed during the

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second spacewalk

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hubble has operated on its original

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batteries since deployment from the

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space shuttle in 1990.

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the next task for the astronauts will be

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installing

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the large fine guidance sensor or fgs

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the fgs is an optical sensor that will

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be used on the hubble to provide

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we're going to put in a new fine

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guidance sensor

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to take the place of one that has shown

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evidence of

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of failing and not not being long for

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this world

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well defined guidance sensors actually

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are the components that find

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the particular observation and they pick

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two guide stars very close to what is

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being observed and the fine guidance

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sensors then zero in on those guide

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stars they lock in on them and now you

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know you're pointing in the right place

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in the sky and then it transfers over to

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the rate sensor units the gyroscopes to

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the final task for grunsfeld and foystol

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will be to install new thermal material

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known as new outer blanket layers or

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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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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 over 30 hours of spacewalking time

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now in the record books atlantis crew is

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in the home stretch with one more eva

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tomorrow and then deployment of hubble

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on tuesday

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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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sts-125

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up next on nasa tv will be the first