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ZAU controller experienced airspace incursion event when he/she confused an airspace boundary.
| Attributes | |
| ACN | 865351 |
| Time | |
| Date | 200912 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | OXI.VOR |
| State Reference | IN |
| Aircraft 1 | |
| Make Model Name | Small Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Airspace Violation All Types |
| Miss Distance | Vertical 1000 |
Narrative:
Aircraft X was direct gyy from ZZZ. I descended aircraft X to 4;000 ft. I had evaluated the route for point outs and believed that the route was west of sbn ATCT airspace. During this time I had a stuck mike on 126.32. I was able to talk to aircraft X on 126.32 and changed aircraft X to 127.8 to allow for communication as they descended. I reviewed aircraft X route again for point outs and decided to call sbn ATCT to be sure. Sbn ATCT approved the late point out and made me aware of the fact that I had confused the bearz/looth boundary with the sbn ATCT/ikk boundary. The bearz/looth boundary is about five to seven miles east of the ikk/sbn ATCT boundary and has similar angles/shapes. My altitude limits for the radar display were set to the ground during this period because I also had grissom ATCT airspace at the time. Recommendation; I will now remember that the northwest side of sbn ATCT's airspace is defined from the northwest corner of grissom ATCT airspace then northwest to the C90 boundary.
Original NASA ASRS Text
Title: ZAU controller experienced airspace incursion event when he/she confused an airspace boundary.
Narrative: Aircraft X was direct GYY from ZZZ. I descended Aircraft X to 4;000 FT. I had evaluated the route for point outs and believed that the route was west of SBN ATCT airspace. During this time I had a stuck mike on 126.32. I was able to talk to Aircraft X on 126.32 and changed Aircraft X to 127.8 to allow for communication as they descended. I reviewed Aircraft X route again for point outs and decided to call SBN ATCT to be sure. SBN ATCT approved the late point out and made me aware of the fact that I had confused the BEARZ/LOOTH boundary with the SBN ATCT/IKK boundary. The BEARZ/LOOTH boundary is about five to seven miles east of the IKK/SBN ATCT boundary and has similar angles/shapes. My altitude limits for the Radar Display were set to the ground during this period because I also had GRISSOM ATCT airspace at the time. Recommendation; I will now remember that the northwest side of SBN ATCT's airspace is defined from the northwest corner of GRISSOM ATCT airspace then northwest to the C90 boundary.
Data retrieved from NASA's ASRS site as of April 2012 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.