[naturalman1975]

In it, he comments on and corrects Lapp's narrative of the accident, including listing that three out of the four fail safe mechanisms failed

Seems to me that that is why there were four fail safe mechanisms. Three failed, one worked, no detonation.

That's why you build redundancies into fail safe systems.

"One simple dynamo-technology low voltage switch stood between the United States and a major catastrophe."

And you want at least one of your safeties to be simple technology - because simple technologies are often the ones that work when the advanced technology fails.

[cynwoody]

Seems to me that that is why there were four fail safe mechanisms. Three failed, one worked, no detonation.

Actually, there was only one. The armed/safe switch.

All four worked as designed. Deploy the chute. Charge the capacitors. Fire the primary!

Oh, never mind, it's on SAFE!