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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 4 stock update report

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the orbit team of stock flight

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controllers had a very productive day

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today as they oversaw the installation

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of a new science instrument along with a

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new command data handling package on the

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hubble telescope two of the three

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highest priorities for the sts-125

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mission

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keith wallis just after he and his team

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had concluded their day to get his

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thoughts on how things went with the

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first of the five planned hubble

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so today we have the first spacewalk of

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the mission and there are two major

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activities the first we were changing

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out the wide field planetary camera 2

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which is installed in the first

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servicing mission and we're putting in

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this new generation wide field camera 3.

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so the old workhorse instrument is now

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being replaced by the new one

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it took a while to get it done there

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were some issues with the eva trying to

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get the camera out crew did a fantastic

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job they worked through it and we got

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the new camera in when that old camera

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got out and the new one got in there was

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a huge cheer which erupted from the

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control center and right after that we

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had our job to do so then we had to

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check out this camera

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is it alive do we have power are there

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heaters is everything working fine in

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fact right now we're going through what

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we call a functional test to make sure

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it's functioning all those other

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functions

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how well can you zoom do all the

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different channels do all the different

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types of light will they all be well

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that all work in this camera we're going

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through that more detailed test right

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now so that was the first part and

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everything's going fantastically well

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the second part is the reason for the

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delay of six months

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we change out our computer our science

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and data handling computer which ships

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all the data from the instruments

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through the telescope and then it gets

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sent back down to earth that had a

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problem back in september so now we have

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this new one actually it's not a new one

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it's 19 years old it's a flight spare we

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tested that we flew it we installed it

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we've checked it out we've done the

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aliveness test we've done the functional

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test it's all working perfectly well so

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it's just a great feeling that first day

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we got it all accomplished it's

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fantastic we got a little bit ahead on

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tasks that are coming up on eba 3 we're

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going to be doing not only installing

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the new cosmic origin spectrograph

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instrument but we're going to be

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repairing the advanced camera for

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surveys it's going to be a long task on

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that day so we actually did some things

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we worked on the doors a little bit to

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make them easier to open for day three

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this will save us some time and make it

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a little easier to get everything done

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on that very busy day so we call those

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get ahead tasks we got a couple of them

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done additionally there's one other task

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that we got done today it's a soft

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capture mechanism and this grips on the

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back of hst so in the future if there

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was to be a rendezvous with hubble it'll

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be easier we looked a while ago at a

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robotic mission of how we could actually

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grab hubble and service it robotically

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and one of the biggest problems we saw a

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few years ago was trying to actually

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grasp hubble because hubble was built to

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be grasped by a shuttle with an arm not

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by a remote satellite so this is

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something in the future if that ever has

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to be done that capability is there

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it'll be much easier

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well tomorrow is more for some of the

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engineering tests to make sure

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hubble is going to run better the two

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big tasks are our gyros and our

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batteries our batteries these are the

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original batteries from 19 years old and

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just like any other battery the battery

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in your car batteries run down over time

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still working fine but they're running

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down so we're gonna install a new set of

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batteries which will give us an extended

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life with hubble for these so we

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shouldn't have any worries about the

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batteries in the future

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the other are the gyros we have six

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gyros on board and these gyros they

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start to fail they break over time we

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last changed them out in 1999 there were

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six gyros we now have three working we

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nominally operate with just two gyros at

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a time but we want to have six so in

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case any break we can still operate so

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we're going to take all the old six ones

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out and put in a brand new set of six it

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as keith mentioned the two main

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objectives during tomorrow's sts-125

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spacewalk will contribute to extending

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hubble's operating life with the

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installation of new gyroscopes and new

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batteries

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after leaving the airlock and completing

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their initial payload-based setup work

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astronauts mike massimino and mike good

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will first focus their attention on

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replacing all six of hubble's gyroscopes

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hubble has six gi arrows in total

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and over time they wear out

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we're down to three working gyros but

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we're only using two we're keeping one

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in spare

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and in the next servicing mission we're

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going to replace all the gyros that we

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have full gyro capability for years to

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come

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well we have six gyros and what we do is

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we package two of them

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into a box with a handle

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it's not an easy test to replace these

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these rate sensor units these three

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boxes the star trackers have these long

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tubes on them so called sun shades so

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when the astronauts have to replace the

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gyros they have to sort of wedge

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themselves into this very small area

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gyros help us in two ways when we move

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from target to target the gyros help the

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computer know how quickly we're turning

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once we get locked in on a target those

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gyros help us steady the vehicle so that

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we can collect all that scientific data

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the second activity by massimino and

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good on friday's spacewalk will be to

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replace one of the two bmus or battery

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module units on the telescope the

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telescope has two battery module units

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each containing three 125 pound nickel

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hydrogen batteries

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these batteries provide all the

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electrical power to support hubble

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operations during the night portion of

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its orbit

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the telescope's orbit is approximately

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96 minutes long about 60 minutes of

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which is spent in sunlight and 36

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the batteries we're operating on are are

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the original batteries that were

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launched with the observatory in 1990

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the design life span was five years so

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these batteries are operating well past

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what they were designed for

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it's time to change them out we are

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losing capacity

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we're installing six new batteries

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arranged in two modules of three packs

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so it's one down and four to go with the

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five space walks that are planned for

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the mission that will extend the

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telescope's life and increase its

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observation capabilities

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we will now return to the johnson space

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center coming up next on nasa tv the

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first airing of the flight day 4