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as i mentioned as john mentioned earlier

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which we talked about not doing and i

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did anyway

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it's okay this is why we train okay

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[Music]

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hi i'm john grunsfeld nasa astronaut hi

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i'm christy hansen johnson space center

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eva task astronaut training lead and

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flight controller and eva means extra

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vehicular activity which is just another

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long way of saying space walk and i got

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to do eight space walks on the hubble

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space telescope

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you might wonder

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how did we learn to do the complex tasks

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using all the cool tools that we used on

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the hubble space telescope christie how

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did we learn how to do all of that so as

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the eva task training lead one of my big

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duties was to work together with the

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astronauts for about two years as well

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as my goddard engineering colleagues to

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develop tools techniques and procedures

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to train crews but generically from

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johnson space center i had to train the

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crew on how to work on mockups that

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simulated flight like hardware on orbit

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and there are various venues that we did

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that so

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the neutral buoyancy tank is a giant

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swimming pool that's 40 feet deep 6.2

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million gallons of water and we can take

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mockups which are volumetric equivalents

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of space tools and science instruments

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on orbit take them down under the water

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and put them in flight like positions

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volumetrically similar meaning same size

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screw positions are in the same location

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distances from point a to point b are

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the same as what you'll see on the

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telescope so in the neutral buoyancy

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tank we have a mock-up of the whole

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space telescope so it's built out of

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different materials with holes in it you

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know because you want a heavy metal

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object in the pool but in terms of

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distances to a science instrument or

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like a handrail sill those are all the

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same this particular mock-up which means

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model of what we have on orbit on the

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hubble actually had on my desk for a

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long time

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because i wanted to practice over and

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over and over again my goal was to you

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know memorize to learn

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every single screw of the hundreds of

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screws that we had to remove on hubble

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so that when i got to orbit there were

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no surprises same for how to use the

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tools you know how to turn the lights on

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run the tool

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change the torques change the direction

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of the tool all those things had to be

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second nature so when i got to orbit it

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was just about fixing the hubble

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sometimes i would come to the goddard

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space flight center where we had the

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full mock-up of the camera and i would

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put on eva gloves space walking gloves

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and practice removing the screws and

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doing the whole task and one thing about

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doing these tasks with goddard because

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they did have higher fidelity mock-up

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units in the building 29 clean room was

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understanding not only the tasks at hand

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but what areas you can't touch when

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you're in a spacesuit so in a higher

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fidelity volumetric simulator at goddard

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for example when john is performing the

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duties on this advanced camera for

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survey upgrade task he can look around

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inside the telescope and it looks more

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like what it would actually look like in

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space as compared to the neutral

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buoyancy tank where you just see kind of

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a lot of plastic around you and you can

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envision there are certain areas like

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seals and radiators that you're not

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supposed to touch and sharp edges you

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learn so you piece all those parts

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together we also have the virtual

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reality lab so the pool you know the

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pool is good for body positioning and

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translating and managing tools but it's

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not really good because there's drag in

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the water right so you're not really you

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don't really you know you're moving a

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mock-up but you're not really feeling

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what a 500 pound mass feels like so we

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take that into the virtual reality lab

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where we have a mass simulator called

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charlotte and we could take the giant

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axial instruments that weigh what 800

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900 pounds or a battery put in all the

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mass specs into the simulator and then

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the crew like john can stand there with

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a headset on that makes it look like

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he's in space holding hand rolls on a

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mock-up and simulates what it would feel

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like to move an 800-pound mass around an

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orbit

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all in all the tools the training the

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mock-ups allowed us to repair and

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upgrade the hubble space telescope so

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that now it's doing better than ever

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don't be late don't be like i hate when

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people are late by the way

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okay ready

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hi i'm john do i need to do this do it