Aircraft penetrated another controller's airspace and came in close proximity to air carrier X.

Attributes
ACN	116481
Time
Date	198907
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sax
State Reference	NJ
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 11
ASRS Report	116481
Person 2
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : radar
Events
Anomaly	conflict : nmac non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 600 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

I observed an untagged discrete beacon code approximately 3 mi and 12 O'clock to air carrier X's position. I issued a traffic alert and air carrier X responded that he had traffic in sight. Subsequent to the near midair collision, it was discovered that the unknown aircraft was on an IFR flight plan. It was small transport Y that was misplaced by another controller.

Original NASA ASRS Text

Title: ACFT PENETRATED ANOTHER CTLR'S AIRSPACE AND CAME IN CLOSE PROX TO ACR X.

Narrative: I OBSERVED AN UNTAGGED DISCRETE BEACON CODE APPROX 3 MI AND 12 O'CLOCK TO ACR X'S POSITION. I ISSUED A TFC ALERT AND ACR X RESPONDED THAT HE HAD TFC IN SIGHT. SUBSEQUENT TO THE NMAC, IT WAS DISCOVERED THAT THE UNKNOWN ACFT WAS ON AN IFR FLT PLAN. IT WAS SMT Y THAT WAS MISPLACED BY ANOTHER CTLR.

Data retrieved from NASA's ASRS site as of August 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.