ppng said, "Anyone notice that the 'big guns' haven't pitched in so far? Probably it's because there is no single answer to this. "
Right on!
The idea of a "failure" consumes paragraphs describing what tail rotor thrust is left - lots, too much, cruise power, almost none. full right?
Then we deal with individual models of helo, and then with varying flight conditions, and then with experience levels, whew!
I'd rather answer, "Honey, do I look fat in these slacks?"
Boiled down to a short, accurate helpful answer, I like ppng's checklist just fine!