Thank you all for your responses.
I think I'll stay away from "terminology" and go with something along:"when pilot flying is unable to maintain the desired approach path, he should not slowdown or descend further" and follow up with an explanation what deviating from the desired approach path means
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And for Jimmy. : "Ko leteči pilot ne mora vzdrževati željenega profila prileta naj preneha z upočasnjevanjem in spuščanjem." That is slovenian language for you.
p.s. I'm still trying to get to the bottom of "positive aircraft control" because in my opinion that should stand for when pilot does something the aircraft does it. Or for helicopters: when helicopter does something the pilot is able to stop it. Whereas negative aircraft control would be where pilot is unable to stop the helicopter from doing its own thing...
