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in august of 2004 there was a 5 volt

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power supply that drives the mechanisms

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on stiffs and it failed

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when that happened it basically meant

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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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atmospherical planet around another star

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we want to keep on doing that kind of

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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 the pressure

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and temperature it's getting at the

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physics of what's going on up there in

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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 imaging

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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 component

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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 wearing these fancy clothes

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a big fancy spacesuit we're using fancy

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tools to do it

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we want to make sure we do it right

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if we are going to go do exploration

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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