Air carrier X had less than standard separation from air carrier Y. System error.

Attributes
ACN	148926
Time
Date	199006
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : eon
State Reference	IL
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zua artcc : zob
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 6
ASRS Report	148926
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : developmental
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Inter Facility Coordination Failure

Narrative:

I was conducting OJT at the eon radar at ord ARTCC. We were quite busy at the time (frequency congestion). Air carrier X had been on frequency from ord approach for a minute or so. Air carrier Y was still on ord frequency, both were at 11000'. Then air carrier Y came over to our frequency. We had the aircraft less than 1 min and lost sep. We were under the assumption ord was providing some sort of positive sep. ATP said constant or increasing. We only had 4 sweeps of the radar to even notice the problem. We probably would have needed to turn air carrier Y still in ord's airspace to ensure sep. Because ord did not provide sep (they ave us converging aft). They caused this system error.

Original NASA ASRS Text

Title: ACR X HAD LESS THAN STANDARD SEPARATION FROM ACR Y. SYSTEM ERROR.

Narrative: I WAS CONDUCTING OJT AT THE EON RADAR AT ORD ARTCC. WE WERE QUITE BUSY AT THE TIME (FREQ CONGESTION). ACR X HAD BEEN ON FREQ FROM ORD APCH FOR A MINUTE OR SO. ACR Y WAS STILL ON ORD FREQ, BOTH WERE AT 11000'. THEN ACR Y CAME OVER TO OUR FREQ. WE HAD THE ACFT LESS THAN 1 MIN AND LOST SEP. WE WERE UNDER THE ASSUMPTION ORD WAS PROVIDING SOME SORT OF POSITIVE SEP. ATP SAID CONSTANT OR INCREASING. WE ONLY HAD 4 SWEEPS OF THE RADAR TO EVEN NOTICE THE PROB. WE PROBABLY WOULD HAVE NEEDED TO TURN ACR Y STILL IN ORD'S AIRSPACE TO ENSURE SEP. BECAUSE ORD DID NOT PROVIDE SEP (THEY AVE US CONVERGING AFT). THEY CAUSED THIS SYS ERROR.

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.