Originally Posted by
Fortissimo
In many parts of the USA, pilots will often operate with TCAS in TA mode to avoid 'nuisance' RA because of parallel runway ops, mixed GA traffic etc. and the operators think this is quite acceptable as the airspace is designated as congested. The chances are that the UAL aircraft never got an RA because the automatics were not enabled. The danger comes when these guys operate over in Europe, which the US regards as congested in all areas, so it is quite possible that one half of a conflict is only receiving TA. So long as the other party follows the RA adequate separation should result, though the experts might be able to point out circumstances where this may not be good enough.
wrong on many points. “The danger comes when in Europe?” Why? ”These guys...”. Seriously? We don’t operate in TA mode like you suggest. There are some GA airports with very closely spaced runways and if you are in day VMC... And you have the traffic in sight... then... you can select TA. This is not as common as you suggest. Or without restrictions, as you suggest.