FLC OF A CANADAIR CL65 REGIONAL JET DSNDED IN RESPONSE TO A TCASII RA AND SUBSEQUENTLY OBSERVED AN ACFT PASS 1000 FT OVERHEAD. ARTCC CTLR HAD PREVIOUSLY ISSUED A TA OF ANOTHER ACFT TO WHICH THEY HAD MAINTAINED VISUAL SEPARATION.

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ON THE EVENING OF JAN/SUN/00; AT APPROX XA30; I (FO FOR ARC X) WAS ON A FLT FROM BDL TO ACY. ONLY THE CAPT; FLT ATTENDANT AND MYSELF WERE ABOARD WITH NO PAX. WE WERE REPOSITIONING TO ACY FOR A CHARTER FLT. THE CAPT WAS THE PF. WE WERE LEVEL AT 11000 FT WITH ZNY BTWN CLOUD LAYERS. THE CTR CALLED OUT TFC AT 1 O'CLOCK POS (CANNOT RECALL DISTANCE) AND WE ACKNOWLEDGED IN SIGHT. CTR THEN CLRED US TO MAINTAIN VISUAL SEPARATION AND CLB TO 16000 FT. THE CAPT AND I OBSERVED THE TFC ON TCASII (WHICH WAS SET TO NORMAL) AND HE (CAPT) INITIATED THE CLB TO 16000 FT. AT 13000 FT WE RECEIVED A TA ON OUR TCASII FOLLOWED BY AN RA WITH A COMMAND TO DSND. THE CAPT DISENGAGED THE AUTOPLT AND FOLLOWED THE COMMAND ON THE VSI. WE BOTH THEN OBSERVED AN ADDITIONAL ACFT APPEAR BELOW THE CLOUD DECK AT 1 O'CLOCK POS. THE ACFT; I ASSUME; MUST HAVE HAD VISUAL CONTACT WITH US AT THAT TIME. BECAUSE A TRANSMISSION WAS MADE TO CTR OF OUR INTENTIONS; I FOLLOWED WITH A TRANSMISSION STATING THAT WE WERE LEVELING. THE ACFT PASSED OVERHEAD AT 1 O'CLOCK POS; LESS THAN 1000 FT. NO OTHER XMISSIONS WERE MADE. WE THEN RESUMED OUR CLB TO 16000 FT. THE INCIDENT MADE US VERY CAUTIOUS WITH ACCEPTING CLRNCS TO MAINTAIN VISUAL SEPARATION TO CLB OR DSND. OUR CONFIDENCE IN OUR TCASII WAS ALSO REINFORCED.