Originally Posted by
john_tullamarine
Given that V1min is a function of Vmcg, to get a lower minimum V1, you need to lower Vmcg.
No, you can't do that. Vmcg is fixed for the certification conditions..
Not so sure - Our Boeing FCTM suggests that using a block derate (not assumed temp...) to reduce Vmcg in contaminated runway conditions may raise the perf limited take off weight. This is probably within the 'certification conditions' that you note which gives the crews an option.
Whether that's an option available on the 146 is something I doubt!!!