Narrative:

Small aircraft X was released from a satellite airport (mwc). I radar identified it using its primary target and advised the pilot that I was not receiving his transponder. I cleared the aircraft to 11,000', assuming that his transponder would come on and I would be able to hand him off to the center controller prior to entering his airspace. The aircraft's transponder never came on. The pilot's next call was 20 mins later, asking me if I was receiving his mode C. I then realized that I had lost track of the primary target. I then used position reports from the pilot to determine that he was in chicago approach control's airspace. I contacted chicago approach to advise them of the aircraft's position and reestablish radar identification. I feel that if the aircraft's transponder would have been working, this would never have happened. I was busy with other traffic, but I should have taken time to scan my flight progress strips and check the progress of the non transponder aircraft.

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Original NASA ASRS Text

Title: SMA X EXITED MKE AIRSPACE AND ENTERED ORD AIRSPACE WITHOUT COORD. OPERATIONAL DEVIATION.

Narrative: SMA X WAS RELEASED FROM A SATELLITE ARPT (MWC). I RADAR IDENTIFIED IT USING ITS PRIMARY TARGET AND ADVISED THE PLT THAT I WAS NOT RECEIVING HIS XPONDER. I CLRED THE ACFT TO 11,000', ASSUMING THAT HIS XPONDER WOULD COME ON AND I WOULD BE ABLE TO HAND HIM OFF TO THE CENTER CTLR PRIOR TO ENTERING HIS AIRSPACE. THE ACFT'S XPONDER NEVER CAME ON. THE PLT'S NEXT CALL WAS 20 MINS LATER, ASKING ME IF I WAS RECEIVING HIS MODE C. I THEN REALIZED THAT I HAD LOST TRACK OF THE PRIMARY TARGET. I THEN USED POSITION REPORTS FROM THE PLT TO DETERMINE THAT HE WAS IN CHICAGO APCH CTL'S AIRSPACE. I CONTACTED CHICAGO APCH TO ADVISE THEM OF THE ACFT'S POSITION AND REESTABLISH RADAR IDENTIFICATION. I FEEL THAT IF THE ACFT'S XPONDER WOULD HAVE BEEN WORKING, THIS WOULD NEVER HAVE HAPPENED. I WAS BUSY WITH OTHER TFC, BUT I SHOULD HAVE TAKEN TIME TO SCAN MY FLT PROGRESS STRIPS AND CHECK THE PROGRESS OF THE NON XPONDER ACFT.

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.