Originally Posted by
uncle_maxwell
Instead of no RA below 500ft (or whatever the floor is), how about telling one conflict to climb and the other one to ‘not climb’? ‘Not climb’ could then be understood (and trained) to mean ‘descend a little, terrain/aircraft/wx permitting or fly level’. Lots of ifs and buts, spurious warnings, limitations for when 3 or more conflicts, TCAS vs. GPWS considerations etc. but perhaps worth a thought.
Most likely the assumption is that in any conflict below 500’, the airplanes involved are in very low energy states.
Instructing a climb could be useless or dangerous. Instructing no climb, same thing.
Engineering safety systems is not simple. You adjust one case, it can worsen another case.