Phl controller, providing OJT, experienced operational error at 4500 ft when developmental controller entered an LR35 into another controller's airspace that contained a departing, climbing MU2.

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Attributes
ACN	631886
Time
Date	200409
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	msl single value : 4500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl.tracon
Operator	common carrier : air taxi
Make Model Name	Learjet 35
Operating Under FAR Part	Part 135
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : phl.tracon
Operator	common carrier : air taxi
Make Model Name	MU-2 Undifferentiated or Other Model
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach instruction : instructor
Qualification	controller : radar
Experience	controller military : 10 controller radar : 18 controller supervisory : 7
ASRS Report	631886
Person 2
Affiliation	government : faa
Function	controller : approach instruction : trainee
Qualification	controller : developmental
Experience	controller radar : 12
ASRS Report	631892
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera other controllerb
Resolutory Action	controller : issued new clearance none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 15000 vertical : 600
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Intra Facility Coordination Failure

Narrative:

Developmental controller descended the LR35 in an area owned by another sector. I did not hear the transmission and a loss of separation occurred with the mu-2. Supplemental information from acn 631892: learjet was on a heading descending for the airport for landing and the other plane departed phl on a heading, climbing. Noticed separation would be lost, I took evasive actions too late and separation was lost.

Original NASA ASRS Text

Title: PHL CTLR, PROVIDING OJT, EXPERIENCED OPERROR AT 4500 FT WHEN DEVELOPMENTAL CTLR ENTERED AN LR35 INTO ANOTHER CTLR'S AIRSPACE THAT CONTAINED A DEPARTING, CLBING MU2.

Narrative: DEVELOPMENTAL CTLR DSNDED THE LR35 IN AN AREA OWNED BY ANOTHER SECTOR. I DID NOT HEAR THE XMISSION AND A LOSS OF SEPARATION OCCURRED WITH THE MU-2. SUPPLEMENTAL INFO FROM ACN 631892: LEARJET WAS ON A HDG DSNDING FOR THE ARPT FOR LNDG AND THE OTHER PLANE DEPARTED PHL ON A HDG, CLBING. NOTICED SEPARATION WOULD BE LOST, I TOOK EVASIVE ACTIONS TOO LATE AND SEPARATION WAS LOST.

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.