Narrative:

On this particular day, nov/xx/90, small aircraft Y that is affiliated with law enforcement asked to work in the TCA 3 north of midway at 5500 ft MSL. This is a normal practice. The pilot of this aircraft is extremely cooperative and punctual. He maneuvers around and slow drifts northeast. I kept watching the aircraft and climbing my jet departures to 6000 ft MSL. Medium large transport X calls me on a 120 degree heading and I climbed him to 6000 ft. I observed small aircraft Y nebound and believed he will continue, so I turn medium large transport X eastbound. I have a few other things to do so I do them and when I looked back small aircraft Y has turned straight at the jet and it is so close I called traffic to both aircraft with no distance because there is not enough time. My initial reaction was to try and stop medium large transport X climb at 5000 ft MSL but I could not do it because I felt medium large transport X would settle at 5500 ft. The pilot of medium large transport X stated that it was close and insists on knowing 'what is that bozo doing there.' I cannot tell medium large transport X the small aircraft's business or intentions, only that I am obligated(?) to work him there. The potential for a disaster is there enough already without this aircraft's presence. This area in O'hare airspace is extremely active at the surface to 7000 ft in this area. Callback conversation with reporter revealed the following information: reporter states that this incident occurred in nov/90 and is submitting the report at the request of other people. Reporter still feels that the law enforcement aircraft causes a problem in the airspace. He said that most of the time it is no problem, but occasionally, it is in the wrong spot. Reporter also stated that other controllers do not have a complaint about the aircraft or how it is handled.

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Original NASA ASRS Text

Title: NMAC OCCURS BTWN A LAW ENFORCEMENT SMA AND AN ACR THAT DEPARTED MDW IN NOV 1990.

Narrative: ON THIS PARTICULAR DAY, NOV/XX/90, SMA Y THAT IS AFFILIATED WITH LAW ENFORCEMENT ASKED TO WORK IN THE TCA 3 N OF MIDWAY AT 5500 FT MSL. THIS IS A NORMAL PRACTICE. THE PLT OF THIS ACFT IS EXTREMELY COOPERATIVE AND PUNCTUAL. HE MANEUVERS AROUND AND SLOW DRIFTS NE. I KEPT WATCHING THE ACFT AND CLBING MY JET DEPS TO 6000 FT MSL. MLG X CALLS ME ON A 120 DEG HDG AND I CLBED HIM TO 6000 FT. I OBSERVED SMA Y NEBOUND AND BELIEVED HE WILL CONTINUE, SO I TURN MLG X EBOUND. I HAVE A FEW OTHER THINGS TO DO SO I DO THEM AND WHEN I LOOKED BACK SMA Y HAS TURNED STRAIGHT AT THE JET AND IT IS SO CLOSE I CALLED TFC TO BOTH ACFT WITH NO DISTANCE BECAUSE THERE IS NOT ENOUGH TIME. MY INITIAL REACTION WAS TO TRY AND STOP MLG X CLB AT 5000 FT MSL BUT I COULD NOT DO IT BECAUSE I FELT MLG X WOULD SETTLE AT 5500 FT. THE PLT OF MLG X STATED THAT IT WAS CLOSE AND INSISTS ON KNOWING 'WHAT IS THAT BOZO DOING THERE.' I CANNOT TELL MLG X THE SMA'S BUSINESS OR INTENTIONS, ONLY THAT I AM OBLIGATED(?) TO WORK HIM THERE. THE POTENTIAL FOR A DISASTER IS THERE ENOUGH ALREADY WITHOUT THIS ACFT'S PRESENCE. THIS AREA IN O'HARE AIRSPACE IS EXTREMELY ACTIVE AT THE SURFACE TO 7000 FT IN THIS AREA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT THIS INCIDENT OCCURRED IN NOV/90 AND IS SUBMITTING THE RPT AT THE REQUEST OF OTHER PEOPLE. RPTR STILL FEELS THAT THE LAW ENFORCEMENT ACFT CAUSES A PROB IN THE AIRSPACE. HE SAID THAT MOST OF THE TIME IT IS NO PROB, BUT OCCASIONALLY, IT IS IN THE WRONG SPOT. RPTR ALSO STATED THAT OTHER CTLRS DO NOT HAVE A COMPLAINT ABOUT THE ACFT OR HOW IT IS HANDLED.

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.