ZAU controller descended aircraft into milwaukee airspace after the traffic cleared the lateral conf...

Narrative:

We recently had a change in airspace and procedures with C90 climbing departures northbound to 15;000 (it used to be 13;000). I had an overflight that was at 16;000; he asked to descend to 12;000 as soon as he was clear of C90 airspace. There was aircraft departing ord that were also traffic for him. Once aircraft was clear of C90 and departing traffic; I descended him to 12;000 without thinking about the fact that I was over milwaukee approach airspace who owns up to 13;000. I was more concerned with missing the new C90 airspace. All the airspace below us was uniform when it was at 13;000. The change in procedures took my attention away from milwaukee approach airspace. Nothing happened from the incident other than I descended into somebody else's airspace with no appreq. I have worked this airspace very little since the change in airspace and procedures.

Original NASA ASRS Text

Title: ZAU Controller descended aircraft into Milwaukee airspace after the traffic cleared the lateral confines of C90 airspace. Reporter cited confusion following a recent airspace change.

Narrative: We recently had a change in airspace and procedures with C90 climbing departures northbound to 15;000 (it used to be 13;000). I had an overflight that was at 16;000; he asked to descend to 12;000 as soon as he was clear of C90 airspace. There was aircraft departing ORD that were also traffic for him. Once aircraft was clear of C90 and departing traffic; I descended him to 12;000 without thinking about the fact that I was over Milwaukee Approach airspace who owns up to 13;000. I was more concerned with missing the new C90 airspace. All the airspace below us was uniform when it was at 13;000. The change in procedures took my attention away from Milwaukee Approach airspace. Nothing happened from the incident other than I descended into somebody else's airspace with no appreq. I have worked this airspace very little since the change in airspace and procedures.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	990857
Time
Date	201201
Local Time Of Day	0001-0600
Place
Locale Reference	ZAU.ARTCC
State Reference	IL
Aircraft 1
Make Model Name	Light Transport Low Wing 2 Turboprop Eng
Operating Under FAR Part	Part 135
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Deviation - Procedural Published Material / Policy

ZAU controller descended aircraft into milwaukee airspace after the traffic cleared the lateral confines of C90 airspace. Reporter cited confusion following a recent airspace change.