I haven't flown learjets (gosh those cockpits are small)...but
it seems to me that if the flaps came down assymetrically, while trying to reduce speeds, you might have quite a flip over.
what flap assymetry protection does the learjet have?
on my beloved DC9, the flaps are bussed together.
the wake turbulence idea is a good one too.
but it all gets down to this...250 knots, that close to the runway is an unstablized approach for sure.