THE FLC OF A DSNDING COMMUTER JET TAKES THE CALL SIGN FOR ANOTHER ONE OF THEIR FLTS AND HAS A POTENTIAL CONFLICT WITH A CLIMBING COMMUTER TURBO PROP NEAR CLT; NC.

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FLT X WAS DSNDING THROUGH ABOUT 10000 FT FOR 9000 FT ON THE SHINE 5 ARRIVAL INTO CLT WHEN THE INCIDENT OCCURRED. I WAS THE FO AND PNF ON THIS LEG; AND IT WAS AT THIS TIME THAT I RECEIVED AN INSTRUCTION FROM ATC FOR FLT X TURN LEFT HEADING 090 DEGS AND DSND TO 7000 FT. I READ BACK THIS INSTRUCTION WITH OUR CALL SIGN AND WE INITIATED THE TURN AND CONTINUED OUR DSCNT. A FEW SECS AFTER WE WERE ESTABLISHED ON THE NEW HEADING ATC CALLED TFC TO US 'FLT X TFC AT 1 O'CLOCK CLIMBING TO 8000 FT.' I REPLIED THAT FLT X WAS LOOKING FOR TFC. THE CAPT REALIZED THAT WE WERE DSNDING TO 7000 FT AND BEGAN TO LEVEL OFF AT APPROX 8700 FT. A SEC OR 2 LATER WE BOTH SAW THE TFC Y AND THE CAPT BEGAN A CLIMBING RIGHT TURN. VERY SOON AFTER THAT (A SEC) THE TCAS ISSUED A 'CLIMB' RA AND ALMOST SIMULTANEOUSLY ATC GAVE INSTRUCTIONS TO CLIMB TO 9000 FT AND TURN RIGHT TO HEADING 180 DEGS. WE WERE ESTABLISHED AT 9000 FT AND 180 DEGS HEADING A FEW SECS LATER. THE REMAINDER OF THE FLT WAS WITHOUT INCIDENT. I BELIEVE THE LARGE NUMBER OF SIMILAR SOUNDING CALL SIGNS ON ATC FREQ MAY HAVE CONTRIBUTED TO THIS EVENT. IT IS POSSIBLE THAT MYSELF; THE ATC CTLR OR BOTH MAY HAVE ASSOCIATED A RADIO CALL SIGN WITH A DIFFERENT ACFT. CARE MUST BE EXERCISED BOTH IN FLT WHILE USING THE RADIO AND AT FLT PLANNING STAGE WHEN CHOOSING AN APPROPRIATE CALL SIGN FOR A PARTICULAR FLT. SUPPLEMENTAL INFO FROM ACN 528942: I HAVE SINCE THIS OCCURRENCE CAME UP WITH A NEW READBACK TECHNIQUE; WHICH I PLAN TO ENFORCE ANYTIME I AM CAPT: IF A CLRNC THAT IS CRITICAL IN NATURE; THE CLRNC WILL INCLUDE THE WORD 'VERIFY' AT THE BEGINNING OF THE READBACK. I THINK THE WORD VERIFY AT THE BEGINNING; IF THERE IS ANY QUESTION IN EITHER OF OUR MINDS; WILL CAUSE THE CTLR TO LISTEN BETTER TO THE READBACK.