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good evening again from nasa's goddard

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space flight center in greenbelt

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maryland the planning team of stock

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flight controllers is currently on duty

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having relieved their orbit team

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counterparts at about 6 pm this evening

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the major event today in the stock was

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of course space shuttle atlantis's

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rendezvous with the hubble space

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telescope

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we spoke with mission operations manager

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keith wallias just after he completed

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his flight day 3 shift and got his

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reaction to what was obviously both a

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busy and rewarding day for his team

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today we had some challenges it was a

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big day for us this was the day that

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we're doing our rendezvous so we haven't

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seen hubble in seven years the shuttle

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was coming up we had to get the

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telescope ready to be serviced to do

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that there were a couple things that had

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to be done so first you have to turn off

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any critical hardware any critical

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electronics because when you have

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something as dramatic as being birthed

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at the back of the orbiter you want to

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make sure you're in a safe configuration

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so we had to go through a process of

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getting the telescope in the right

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configuration we've got to make sure

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we're pointed in the right direction we

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have to make sure we have the right

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communication set up so we talk with the

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orbiter we'll be able not only to talk

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directly to the satellites the tdrs

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satellites like we usually do but now

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we're actually talking through the

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orbiter which is the configuration that

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we're going to use for the whole rest of

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the mission so we have a series of steps

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that we have to do to get ready

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for the orbit to grab us and then put us

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us in the back of the payload bay and

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then after in the back of the payload

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bay now we have to do some further

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reconfiguration because all those things

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that we turned off before but now we've

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got to start turning them back on again

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and now we have to get ourselves in a

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configuration that's ready for the big

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evas which are starting tomorrow

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tomorrow is our first big day you almost

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think that's as a big baseball game in a

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sense and we've got to the plate we're

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ready to go and now ready to go to first

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base and the first thing we have to do

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tomorrow we have two evas we're going to

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change out the wide field camera we have

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a wide field camera on board which is

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installed this is wide field camera 2

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back in the first servicing mission back

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in 1993 so we're going to be putting

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this new camera on board if you think

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how digital cameras have changed since

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1993 this is going to be the capability

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that we're going to have now in the

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future so the first task we have to do

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is we have to get this old wide field

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camera power it down get it ready to be

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taken out you have to remove the power

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because when the astronauts are working

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on something you can't have any power

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there so we're going to have that camera

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turned down the astronauts are going to

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go out change that camera out put a new

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wide field camera

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then we're going to go through what we

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call an aliveness test if you buy just a

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camera at the store you're going to do

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what you call a liveness test you're

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going to turn it on make sure it works

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it has power that's what we're going to

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do we're going to make sure it's hooked

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up correctly make sure the astronauts

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don't have to do anything differently

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so that's the first part now the second

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part of our eva or extravehicular

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activity or spacewalk is when we're

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going to change out the

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cndh or command and data handling

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computer and this is the part we had the

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failure on back in october so this is a

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unit that was 19 years old that failed

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we're going to change it out and we're

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going to put in a brand actually we're

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putting in a brand new old unit this is

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one of the flight spares from 19 years

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ago

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we checked it out we tested on the

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ground and we're going to install it and

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we expect it to work perfectly and we're

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going to go through the same process

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we're going to do a liveness test on

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that also to make sure it works

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after these are done we later have we

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call a functional test after you bought

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that new camera and you made sure it

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turned on

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now you're going to check out the

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different capabilities you can look at

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the zoom mode you're going to look at

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the panoramic mode you're going to look

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at all these capabilities now we're

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going to do that functional test to make

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sure it's functioning correctly both for

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the wide field camera and this new sic

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engage this command and data handling

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computer so that's going to be a full

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day tomorrow

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with hubble now on its work stand the

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telescope is ready for five consecutive

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days of hands-on work by pairs of space

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walking astronauts

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beginning tomorrow morning the

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astronauts will install the first of the

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two new science instruments and replace

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the command and data unit

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as a way of giving an overview of the

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planned five spacewalks for the

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telescope the following chart gives a

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graphic representation of all the plan

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due hardware that is planned to be

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installed on hubble

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on the first eva as mentioned by keith

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the new wide field camera 3 as well as

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this science instrument command and data

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handling unit will be installed

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eva number 2 will see the installation

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of the first set of batteries on hubble

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as well as six new gyros that are each

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contained in

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pair units

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the third space walk will see the

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installation of the second new science

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instrument known as koss or cosmic

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origin spectrograph as well as the

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repair efforts for the advanced camera

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for survey

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thursday's spacewalk will see the repair

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of the stis instrument

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as well as installation of some of the

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new outer blanket layer material that's

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being put on the telescope and the fifth

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and final spacewalk we'll see the second

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set of batteries as well as a new fine

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the new wide field camber 3 instrument

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will extend hubble's capability not only

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being able to see deeper into the

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universe but also by providing

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wide field imagery in all three regions

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of the spectrum from ultraviolet into

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visible and then into the near infrared

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it is this wide what is known as

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panchromatic type coverage

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of light that makes wide field camera 3

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so unique

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as mentioned earlier the second major

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activity for tomorrow's spacewalk will

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be the installation of the new science

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instrument control and data handling or

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when you're working with the hubble

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space telescope program anything can

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happen

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and in fact just a few weeks before we

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were scheduled to launch back in october

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the data handling system the sic and dh

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went down

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the sic gate it is critical to the

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hubble space telescope because without

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it you have no telescope you have no

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science information

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nasa administration decided that it

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would be worth it to postpone the

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servicing mission so that we could get

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the flight spare

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and test and verify it and replace it on

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this servicing mission

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the sic-d-h function is to take the data

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from the science instruments and

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it formats it

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it puts it in a command sequence that is

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then transmitted to the ground and then

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deciphered back on the

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ground without it you have no science

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information and by putting a

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new

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sic day chapter you gain the redundancy

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back and you're not one failure away

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the final activity of the spacewalk on

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thursday will involve securing the soft

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capture mechanism to the bottom of the

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telescope the soft capture mechanism

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will enable the future rendezvous

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capture and safe disposable safe

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disposal

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of hubble by a crude or robotic mission

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so the hubble space telescope now sits

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in atlantis payload bay near the 22 000

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pounds of hardware that will give the

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telescope a longer life and increased

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observation strength

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the sm-4 team here at goddard will be

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standing by for tomorrow's spacewalk

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which will see the start of work to

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bring hubble to the apex of its

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capabilities

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we now return to mission control in

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houston for nasa television's coverage