Narrative:

I was working 8-10 other aircraft at the time. My main concern was to get aircraft X below aircraft Y. Aircraft Y was a departure off lan to cvg via lfd, fwa VORTAC. Once aircraft X was under aircraft Y, my concern was to keep aircraft Y below aircraft Z, a dtw inbound over lfd VORTAC. The 3 data blocks overlapped and the altitude readout dropped off the aircraft Y data block. I dropped the data block on aircraft X, as I had switched him to azo approach 5 mi east of lfd. I felt a normal rate of descent, plus azo approach would descend him below ZAU airspace. For some reason, aircraft X changed from a normal rate of descent to 500-600 FPM. I also later found out they were training on the radar position at azo approach, which may have delayed normal handling a little. I failed to point out aircraft X to the ZAU kel sector. Why do we have an LOA with azo approach telling ZOB to descend arrival aircraft to 11000 ft, an altitude they don't own, with no assurance they will descend the aircraft below ZAU airspace. The ZAU/ZOB LOA says nothing about how azo approach arrs will be handled. Our ZAU/ZOB LOA deals with fwa approach arrs as descend to 11000 ft and hand off to ZAU. The airports are almost same distance from center boundaries.

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Original NASA ASRS Text

Title: ARTCC RADAR CTLR HANDED OFF TFC TO APCH CTL. THE TFC AT THE TIME WAS NOT DOWN IN THE APCH CTL AIRSPACE AND ENTERED THE ADJACENT CTR'S AIRSPACE.

Narrative: I WAS WORKING 8-10 OTHER ACFT AT THE TIME. MY MAIN CONCERN WAS TO GET ACFT X BELOW ACFT Y. ACFT Y WAS A DEP OFF LAN TO CVG VIA LFD, FWA VORTAC. ONCE ACFT X WAS UNDER ACFT Y, MY CONCERN WAS TO KEEP ACFT Y BELOW ACFT Z, A DTW INBOUND OVER LFD VORTAC. THE 3 DATA BLOCKS OVERLAPPED AND THE ALT READOUT DROPPED OFF THE ACFT Y DATA BLOCK. I DROPPED THE DATA BLOCK ON ACFT X, AS I HAD SWITCHED HIM TO AZO APCH 5 MI E OF LFD. I FELT A NORMAL RATE OF DSCNT, PLUS AZO APCH WOULD DSND HIM BELOW ZAU AIRSPACE. FOR SOME REASON, ACFT X CHANGED FROM A NORMAL RATE OF DSCNT TO 500-600 FPM. I ALSO LATER FOUND OUT THEY WERE TRAINING ON THE RADAR POS AT AZO APCH, WHICH MAY HAVE DELAYED NORMAL HANDLING A LITTLE. I FAILED TO POINT OUT ACFT X TO THE ZAU KEL SECTOR. WHY DO WE HAVE AN LOA WITH AZO APCH TELLING ZOB TO DSND ARR ACFT TO 11000 FT, AN ALT THEY DON'T OWN, WITH NO ASSURANCE THEY WILL DSND THE ACFT BELOW ZAU AIRSPACE. THE ZAU/ZOB LOA SAYS NOTHING ABOUT HOW AZO APCH ARRS WILL BE HANDLED. OUR ZAU/ZOB LOA DEALS WITH FWA APCH ARRS AS DSND TO 11000 FT AND HAND OFF TO ZAU. THE ARPTS ARE ALMOST SAME DISTANCE FROM CTR BOUNDARIES.

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.