RPTR ALLEGES THE NEW ICAO ACFT IDENTIFIERS CAUSE CONFUSION TO THE CTLRS AS WELL AS INCREASING WORKLOAD.

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RECENTLY FAA ADOPTED ICAO ACFT IDENTIFIERS FOR ATC. THIS HAS CREATED MUCH CONFUSION FOR UNITED STATES ATC'S; UNDULY INCREASED WORKLOAD AND POTENTIAL FOR INCREASED OPERRORS AND UNSAFE CONDITIONS. THE REASON THESE CONDITIONS ARE PRESENT NOW ARE THAT ICAO IDENTS GROUP ACFT WITH DISSIMILAR CHARACTERISTICS UNDER ONE IDENT. FOR EXAMPLE; G1; G3 AND G4 ARE ALL NOW GULF. THERE IS A TREMENDOUS DIFFERENCE IN PERFORMANCE BTWN G2 AND G4; THUS SETTING CTLRS UP FOR SPD OVERTAKES WITH ACFT IN CLOSE PROX; WITHOUT THE CTLR EXPECTING IT (IE; DEPS). ANOTHER EXAMPLE IS: AT42; AT72 NOW ATR -- AGAIN A GREAT PERFORMANCE DIFFERENCE. HS25 AND BA10 ARE NOW BOTH HS25; AGAIN A GREAT DIFFERENCE IN PERFORMANCE. PA28 AND PARO BOTH NOW PA28. C337 NOW P337 -- A CESSNA -- THIS MAKES NO SENSE; IT DOES CREATE CONFUSION THOUGH -- A C407 NOW A F407; THE SAME. FALCON JETS CHANGED FROM DA TO FA; EG; DA10; DA20; DA50 NOW FA10; FA20; FA50 EXCEPT DA90 IS NOW F900 -- WHAT IS THAT? THERE ARE MORE EXAMPLES. I BELIEVE IT IS A MATTER OF SAFETY THAT THE FAA REVERT IMMEDIATELY BACK TO UNITED STATES IDENTS. ATC'S HAVE ENOUGH TO THINK ABOUT WITHOUT WASTING PRECIOUS TIME TRYING TO FIGURE OUT WHAT KIND OF ACFT HE/SHE IS DEALING WITH.