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Challanger Turbo Pumps?
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Danny Dot wrote: One of the risks of not enough Engine CutOff (ECO) sensors is running out of either LOX or H2 and the engine not being commanded to shut down. First the probability of a low level cut off is very small. I think we have had 2 low level cut offs in the shuttle program. One was the flight that lost an engine on ascent and the other was the nozzle leak flight. On both of these flights the tank ran dry and the sensors commanded a shut down. The engines are NOT designed to have an orderly shutdown if they are starved of fuel and not commanded to shut down in time. One risk is a turbo pump failing catastrophically (loss of orbiter and crew!!!). But I recall being told with Challenger, all 6 turbo pumps remained intact. Can anyone confirm this? But then on Challenger the engines lost power and would have immediately gone into a pneumatic shut down. This is a designed shut down mode. If the ECO sensors fail to command a shutdown, the engines would not instantly go through a pneumatic shut down. The engine controllers would wait for an red line violation and at that time command a shut down. Look at my site and see how NASA treats a creative mind!!! The summary is "Not Very Well" :-) www.mobbinggonemad.org |
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