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

Attributes
ACN	131089
Time
Date	198912
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	131089
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 3000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was working a feeder fix position, which required me to set up aircraft in-trail, before being handed off to a final controller, while also working the east, north and southbound departures. After setting up the inbnds in a position to be readily turned to the downward, I didn't effect a handoff or frequency change on air carrier X, which subsequently converged with air carrier Y on the localizer.

Original NASA ASRS Text

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

Narrative: I WAS WORKING A FEEDER FIX POS, WHICH REQUIRED ME TO SET UP ACFT IN-TRAIL, BEFORE BEING HANDED OFF TO A FINAL CTLR, WHILE ALSO WORKING THE E, N AND SBND DEPS. AFTER SETTING UP THE INBNDS IN A POS TO BE READILY TURNED TO THE DOWNWARD, I DIDN'T EFFECT A HDOF OR FREQ CHANGE ON ACR X, WHICH SUBSEQUENTLY CONVERGED WITH ACR Y ON THE LOC.

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.