Phl approach controller experienced loss of separation.

Attributes
ACN	585179
Time
Date	200306
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	msl single value : 7000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl.tracon
Operator	general aviation : personal
Make Model Name	Aero Commander 685
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : phl.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 20
ASRS Report	585179
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	airspace violation : entry conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued new clearance none taken : unable
Consequence	faa : investigated
Miss Distance	horizontal : 15000 vertical : 500
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #1 took a frequency change given to another aircraft. When that aircraft was then issued climb instructions, there was no reply. By the time the other aircraft (aircraft #2 was in another controller's airspace, under a different controller's control) was descended to 6000 ft, standard separation was lost (approximately 2 1/2 mi, 500 ft).

Original NASA ASRS Text

Title: PHL APCH CTLR EXPERIENCED LOSS OF SEPARATION.

Narrative: ACFT #1 TOOK A FREQ CHANGE GIVEN TO ANOTHER ACFT. WHEN THAT ACFT WAS THEN ISSUED CLB INSTRUCTIONS, THERE WAS NO REPLY. BY THE TIME THE OTHER ACFT (ACFT #2 WAS IN ANOTHER CTLR'S AIRSPACE, UNDER A DIFFERENT CTLR'S CTL) WAS DSNDED TO 6000 FT, STANDARD SEPARATION WAS LOST (APPROX 2 1/2 MI, 500 FT).

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.