Phl is involved in an operational error by misjudging spacing between a BE40 and a GLF4.

Attributes
ACN	531531
Time
Date	200111
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pne.airport
State Reference	PA
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl.tracon
Operator	general aviation : corporate
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : phl.tracon
Operator	general aviation : corporate
Make Model Name	Gulfstream Jet Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Experience	controller radar : 11 controller time certified in position1 : 8
ASRS Report	531531
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was working the south arrival sector at phl approach. I vectored aircraft X toward pne (030 degree heading at 3000 ft). I noticed a conflict between aircraft X and another aircraft. The pilot stated that he had traffic aircraft Y. I issued a left turn to 270 degrees, and then a descent clearance to 2000 ft to avoid the traffic. Seconds later, aircraft X conflicted with another aircraft Z that was inbound to ttn. I then issued a left turn to 120 degrees.

Original NASA ASRS Text

Title: PHL IS INVOLVED IN AN OPERROR BY MISJUDGING SPACING BETWEEN A BE40 AND A GLF4.

Narrative: I WAS WORKING THE S ARR SECTOR AT PHL APCH. I VECTORED ACFT X TOWARD PNE (030 DEG HEADING AT 3000 FT). I NOTICED A CONFLICT BETWEEN ACFT X AND ANOTHER ACFT. THE PLT STATED THAT HE HAD TFC ACFT Y. I ISSUED A LEFT TURN TO 270 DEGS, AND THEN A DSCNT CLRNC TO 2000 FT TO AVOID THE TFC. SECONDS LATER, ACFT X CONFLICTED WITH ANOTHER ACFT Z THAT WAS INBOUND TO TTN. I THEN ISSUED A LEFT TURN TO 120 DEGS.

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.