Whilst reading A Technical History of the External Tank I ran across this comment:
Although the problem has not recurred, John Young, in his famous top ten Shuttle risk letter published after the Challenger accident, listed stiction as a significant risk.
What were the top ten risks listed by Young1? Preferably, with the full text of the "letter".
I remember him being famous for issuing memos about Shuttle safety, but I don't remember this one.
1Ok, the other nine.