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Dana:

Understand what you mean re: your brand new engineer's degree --- I learned
pretty quick that the sheep-skin really revealed how much I didn't know and
had to learn - was still learning after more than 40 years in the profession
(23 of them on the B-1 program)!

Regarding the Challenger's and other O-rings, if you fly them in weather
that will freeze 'em like they did, you can pretty well count on the damn
things failing if they have to restrain any kind of high pressure. However,
I doubt that we subject the ones in our airplanes to duty approaching what's
required in the joints of the shuttle's solid rocket casings.

Long story short, if you've got leaking O-rings, they're probably physically
damaged - most likely cause: installation.

Dan Schaefer
N235SP (Now in the 600 club)

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