AN MD80 NBOUND OFF LGA CLBING TO 7000 FT CONFLICTED WITH A C650 WBOUND OFF HPN ALSO CLBING TO 7000 FT.

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THE SECOND ACFT INVOLVED WAS A C650 THAT DEPARTED HPN AND WAS WBOUND CLBING TO 7000 FT. THE ACR X JET WAS NBOUND FROM LGA CLBING TO 7000 FT AND THE ACR X ARTS FULL DATA BLOCK NEVER ACQUIRED. APPARENTLY THE ACR X FLT PLAN WAS NOT STORED IN THE COMPUTER; THEREFORE WAS NOT GOING TO TAG ON THE TARGET. THE ACR X JET RPTED A LOSS OF SEPARATION WITH A LEARJET AT 7000 FT; HOWEVER THE TYPE ACFT WAS A CITATION (C650). THE DEP POS BECAME QUITE BUSY WITH TRAINING IN PROGRESS. THE DEP HDOF CTLR WAS ASKED TO WATCH THE TARGET OF THE ACR X JET TO MAKE SURE IT TAGGED UP BUT; APPARENTLY THE HDOF PERSON WAS DISTRACTED WITH COORD WITH ANOTHER POS. AFTER REVIEW; THE LOSS OF SEPARATION OCCURRED APPROX 15 MI N OF LGA WITH THE C650 AT 7000 FT AND THE ACR X JET AT 6500 FT RESPONDING TO AN RA. IF THE ACR X JET WOULD HAVE ACQUIRED AN ARTS TAG; THIS INCIDENT WOULD IN ALL LIKELIHOOD HAVE BEEN AVOIDED. SUPPLEMENTAL INFO FROM ACN 475357: ACR X CAME OFF LGA RWY 31 HEADING 360 DEGS BEACON WAS CORRECT AS PER THE STRIP WAITED TO TAG UP; TRIED TO REFRESH SYS. MANY OTHER THINGS OCCURRING AT THE TIME. FLT WAS REMOVED FROM THE SYS PRIOR TO ACFT TAKING OFF AFTER THE INCIDENT MANUAL TAG UP ACR X.