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18

There is a detailed list here of everything that needed to be done for a scrubbed Saturn V launch, which gives an idea of the scale of the problem. Lots and lots of individual tasks to ensure the booster is still safe and stable. Get the crew out and safe everything Drain the propellants from the booster (they usually can't be left fuelled for a prolonged ...


17

For the shuttle, technically the deorbit burn could be aborted, but the window to do so was extremely limited. Once the deorbit burn was started, one of the key parameters monitored by the crew was the current height of perigee "HP" displayed on the maneuver display. This was a number in nautical miles and would have started out roughly equivalent to the ...


5

There is no* safe condition used by Ariane 5. It is not common to use Launch Escape Systems for UNmanned flights. Actually the hardware of a spacecraft is not as costly as you may think, the development itself is driving the costs. So usually there are Flight Spare Units (Wikipedia Flight Spare) of the spacecraft, sometimes even (nearly) assembled. If a ...


4

From your question, I think you're describing an otherwise nominal mission where the launch escape system just doesn't seperate, but the booster is able to keep flying and put the spacecraft into orbit. There are two systems which could have failed: the bolts holding the launch tower and BPC in place the jettison motor to remove the tower + BPC From the ...


3

Summary: There was no alternative to the launch escape system; it relied on redundancy and testing. But there were two ways to detach the LES. There were two different mechanisms to separate the LES from the command module. During a normal flight, the frangible nuts connecting the legs of the LES to the CM would be detonated. During an emergency escape, ...


2

It's less efficient to circularize when you're not at periapsis but it can be done and in the case of aborting a de-orbit the inefficiency isn't all that great anyway since you're near periapsis. The limiting factor is that fuel is a very expensive commodity, rockets don't carry much extra. Once your periapsis is in the atmosphere you won't have the fuel ...


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