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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.

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    $\begingroup$ Haven't found the document, but footnote 63 here gives a possible title: Memorandum from CB/Chief, Astronaut Office to CA/Director, Flight Crew Operations, "One Part of the 51-L Accident-Space Shuttle Program Flight Safety". $\endgroup$ – Russell Borogove May 24 at 21:01
  • $\begingroup$ I found several contemporary news articles about it - Truly released the memo in March 1986 - but the 'top ten list' seems to have been an attachment that is mentioned, but not shown in the articles. Here's one such that mentions a few issues: apnews.com/ccb0ae4d23f23b581d9b601fd833fcf8 $\endgroup$ – Organic Marble May 24 at 23:17
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    $\begingroup$ I have found the original memo you're talking about. No "top ten" list. See history.nasa.gov/SP-4407/vol4/cover.pdf page 378 has the memo. Also, stiction is not mentioned in the memo. There is a list of safety questions that Young raised that are interesting, but not set out as a list I'm afraid. It seems that another document is the one that contains the list... $\endgroup$ – Michael Stachowsky May 25 at 13:27
  • $\begingroup$ That's super interesting! But I think the answer must include a list that includes stiction. So maybe the news articles were talking about a different memo. $\endgroup$ – Organic Marble May 25 at 13:34
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    $\begingroup$ Indeed. To clarify, I was talking about the memo mentioned in the comments, so yes, it looks like it isn't the one you were looking for $\endgroup$ – Michael Stachowsky May 25 at 13:37

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