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Imbalance...if you were a little more upfront at the beginning ..
Ok. So what your saying is...'can I get away with getting into a field using reverse because the non reverse numbers won't make it...in a foreign country'...Probably France right? Your worried your going to get nicked after landing by the authorities and want to hand them a piece of paper and a middle finger! Why didn't ya say so!
The fact that you HAVE a plane certified with braking distances to include reversers is your 'piece of paper' ...if that distance says you can make it in, then your golden..
Secondly, I don't think any country has in thier regs a requirement telling you how to land a plane, with reverse or not..