Phl approach controller noticed a B737 inbound converging on a DH8 outbound.

Attributes
ACN	412944
Time
Date	199809
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phl
State Reference	PA
Altitude	msl bound lower : 7000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	412944
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance none taken : unable other
Consequence	Other
Miss Distance	horizontal : 16500 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Working approach control at phl inbound to phl at 9000 ft and DH8 departure phl area, I noticed them on a converging course. I immediately turned the aircraft left 090 degrees to avoid the traffic and a descent to 7000 ft. The DH8 was on a vector to his first fix to avoid parachute jumping on his departure route.

Original NASA ASRS Text

Title: PHL APCH CTLR NOTICED A B737 INBOUND CONVERGING ON A DH8 OUTBOUND.

Narrative: WORKING APCH CTL AT PHL INBOUND TO PHL AT 9000 FT AND DH8 DEP PHL AREA, I NOTICED THEM ON A CONVERGING COURSE. I IMMEDIATELY TURNED THE ACFT L 090 DEGS TO AVOID THE TFC AND A DSCNT TO 7000 FT. THE DH8 WAS ON A VECTOR TO HIS FIRST FIX TO AVOID PARACHUTE JUMPING ON HIS DEP RTE.

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.