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we are going to add a shuttle servicing

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mission to the hubble space telescope to

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the shuttle's manifest to be flown

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about 7 35 eastern standard time hubble

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entered into inertial hole safe modes he

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noticed spikes on the structure current

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and the main bus current we believe that

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this is indicative of a short circuit

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that occurred in the advanced camera for

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acs was inserted on hubble in 2002

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before it died it was the most heavily

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used instrument on hubble

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acs was our best survey camera so it was

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able to

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for example map the distribution of dark

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matter and space no one had ever done

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that before

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acs was critical to our study of dark

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energy surveying the

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the galaxies out across space for

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exploding stars supernovae that would

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indicate how far away those galaxies

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were and how fast they're moving away

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so we were pretty far along on stis

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and then acs failed and that was really

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late in the game what failed is a power

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supply

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and in fact in the acs there were two

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power supplies one

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redundant set of power supplies so one

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of them failed and they switched to the

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other side and the other one then failed

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so there was not much time but it was

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decided to see if we could come up with

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a fix for it

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we leveraged what we learned on this

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disk job

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you know how to get to those components

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how to remove large numbers of fasteners

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with fastener capture plates how to

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build special tools for the astronauts

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to do the job

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just getting the thing to work in this

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amount of time

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has been difficult we're running

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probably two to three times faster than

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a typical program getting things from

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concept to design to actual

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cutting metal and building things

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it has become one of the fortes of our

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program

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that our people are really really good

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removing the card the the cards that

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we're taking out are very similar to the

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card that's being removed in this disc

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repair and in this disk repair they are

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going into where the power supply is

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because that was also a power supply

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failure

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so they're taking off 111 screws for

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stis and it's

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32 for us

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we had learned an awful lot on stis we

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knew how to get to these places we knew

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how to pull covers off we knew how to

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pull cards out now the problem was could

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we do it where acs

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these instruments were never designed to

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be opened up

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by astronauts in space and certainly not

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by astronauts in space working in big

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bulky spacesuits

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so we needed to make sure that what we

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were doing was something that could be

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done by an astronaut in zero gravity

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with this big puffy suit around them

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constraining their movements and not

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only that but it's inside what's called

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the aft shroud of the hubble space

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telescope so there's the space is kind

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of confined they have these doors that

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they open up and can get in

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but where we're actually going in is

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kind of they kind of have to reach

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around

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some of the stuff

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and not work right in front of their

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faces

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the primary detector of the acs what's

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known as the wide field channel is a ccd

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just like in your digital camera

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only it's 16 megapixels so there's a box

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that controls that the ceb and that's

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what we're taking out and it's probably

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fine it actually is probably still

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working but that's the easiest way to

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get in and get new power into the system

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we had to design a a plate that goes on

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top of where we're taking off the screws

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sort of clips on there and has little

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holes in them for the screwdriver to go

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through

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the bit and those are too small for the

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screws to pass through and that was

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designed for the stis repair

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and they had a very large one with lots

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of different types of screws and we were

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fortunate that we are in the end only

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taking out one size of screw

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work we're going in through the top of

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this box and there are four circuit

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cards in there we'll pull those out and

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that leaves us a hole with connectors at

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the bottom and those connectors are what

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connect to the detector and what used to

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supply power to it

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and then we'll have a little cartridge

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with four new cards in it that will

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slide into that space

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and that will

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allow us to make connections there with

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the new cards

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but also the power now will come in from

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the outside through our external power

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supply

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it's particularly important to repair

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acs

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because it together with the new camera

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the white field camera 3 make a

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complimentary set they have a full set

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of capabilities that astronomers need in

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cameras operating together it's very

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clear

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that after the servicing mission is over

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astronomers will be using this

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combination of whitefield camera 3 and