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Detailed text transcripts for TV channel - CNN - 20110429:16:26:00

It s like 2 hours, 26 minutes away. why are we just learning about this problem now, about these two heaters not working? is that an unusual situation? reporter: the question is first, certainly, welcome, first, mike. is it unusual to just find out now about these heaters as something that nasa s been working on? i assume it s because they re trying to work through the issue before coming out and saying, gee, we re not going. well, that s correct. i m not fully informed about the issue, but apu is a hydrogen fuel and it s basically passed over a catalyst that is heated up to 500 degrees, and that then turns into a hot gas that decomposes and produces the thrusts around the turbine that produces the electric power. that fuel system has to be not too hot and not too cold. in this case, the heater s required to stop it from freezing. michael, i was just going to ask reporter: i was just going to ....

Malfunctioning Heaters , Mike Fole , Apu 1 , Hydrogen Fuel , Michael Foale , Fuel System , Electric Power ,

Detailed text transcripts for TV channel - CNN - 20110429:16:23:00

And once they get in there and do that, then they ll be able to determine exactly how long of a delay. i had heard from some folks that it s probably no earlier than a 48-hour delay, unless somehow or other they find that it s something very simple. but it is not, from what i understand, an easy fix. so, the astronauts will go back and they ll just go back to the operations and checkout building, and they will wait to see how long a delay this is. if it stretches out beyond a few days, then obviously, they would go ahead and return back to houston until the shuttle is ready to fly. but again, they re not going to be able to do anything until they actually drain that tank, and that takes several hours to do that, before they can actually get in there, the trouble-shooters, to see what exactly the problem is with these two heaters on apu-1. and again, there s three apus, but one of them, there are malfunctioning heaters, and that has forced the scrub of today s endeavour launch. and ....

Operations And Checkout Building , Malfunctioning Heaters , Apu 1 , Trouble Shooters , John Zarrel Zarrella , President Of The United States ,

Detailed text transcripts for TV channel - CNN - 20110429:16:22:00

Cold and it would freeze up if you didn t have the heaters working. and that is the fuel, the propellant that allows them to steer and to use the rudder controls, et cetera. so, they have to have those working. there are redundancies, but they do not fly without those apus. so, right now, it appears as if we are in a scrub situation here at the kennedy space center. endeavour will not be lifting off this afternoon. suzanne? so, john, what does this mean? what happens? the astronauts, they return back to their building and they take off their suits and the diplomats go home? reporter: correct. how does this all kind of unfold today? reporter: well, what will happen now is they have to drain the vehicle. they ve got all that 500,000 gallons of liquid hydrogen and oxygen in the tank. they ve got to get all that drained back out of the tank, and then they ll be able to go and start trouble-shooting whatever it is that is causing these heaters to malfunction. ....

Rudder Controls , Heaters Working , Et Cetera , Suzanne Malveaux , John Zarrel Zarrella , Kennedy Space Center , Malfunctioning Heaters , Liquid Hydrogen ,

Detailed text transcripts for TV channel - CNN - 20110429:16:34:15

Detailed text transcripts for TV channel - CNN - 20110429:16:34:15
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Space Shuttle , Malfunctioning Heaters , President Obama , Gabrielle Giffords ,