For a Lear 31, I do believe you can legally get one into a 2500' strip (part 91 that is - charter requires more runway), but the conditions must be right and the pucker factor would still be very high. Getting out is another story. You would have to be extremely light with only enough gas to get you to a very close airport and no passengers, it would have to be at a low elevation, and it would have to be cold. I know a guy who landed a 25 on a 2800' strip. If he can get one of those in there, you can get a 31 into 2500'. Barely.
It's been a while since I've flown a 31 so I can't remember any exact numbers off the top of my head.
I don't think I'd want to try it, though.
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