Narrative:

The north arrival sector handed off an aircraft (HS25) landing ilg, de, descended to 4000 ft. I observed an aircraft at 4000 ft and 4 mi east of the HS25 and turned him 270 degrees and descended him to 3000 ft. As their courses diverged, I observed another target acquire below the HS25 at 2500 ft. (I had turned the HS25 back on course.) I immediately turned the HS25 back to 220 degrees, and told him to stop his descent. Traffic was issued in both cases and acknowledged 'in sight.' the north.a. Controller had forgotten the helicopter at 4000 ft, stopped the HS25 at 4000 ft because of the 40N airport departure climbing to 3000 ft, no radar at the time.

Google
 

Original NASA ASRS Text

Title: PHL CTR OBSERVES AND TAKES ACTION TO RESOLVE CONFLICT BETWEEN A DSNDING HS25 AND A DEPING HELI OFF AN UNCLTED ARPT. TCAS A FACTOR.

Narrative: THE NORTH ARRIVAL SECTOR HANDED OFF AN ACFT (HS25) LNDG ILG, DE, DSNDED TO 4000 FT. I OBSERVED AN ACFT AT 4000 FT AND 4 MI EAST OF THE HS25 AND TURNED HIM 270 DEGS AND DSNDED HIM TO 3000 FT. AS THEIR COURSES DIVERGED, I OBSERVED ANOTHER TARGET ACQUIRE BELOW THE HS25 AT 2500 FT. (I HAD TURNED THE HS25 BACK ON COURSE.) I IMMEDIATELY TURNED THE HS25 BACK TO 220 DEGS, AND TOLD HIM TO STOP HIS DSCNT. TFC WAS ISSUED IN BOTH CASES AND ACKNOWLEDGED 'IN SIGHT.' THE N.A. CTLR HAD FORGOTTEN THE HELICOPTER AT 4000 FT, STOPPED THE HS25 AT 4000 FT BECAUSE OF THE 40N ARPT DEP CLIMBING TO 3000 FT, NO RADAR AT THE TIME.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.