Departure control erred when 1 sector controller allowed do-328 to slide into another controller's airspace without coordination. The reporting, second controller, turned his aircraft (B737) away from the intruding do-328.

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Attributes
ACN	542576
Time
Date	200203
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	msl single value : 6000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : c90.tracon tower : top.tower
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	Do 328 TP (Turboprop)
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller military : 4 controller radar : 16
ASRS Report	542576
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : separated traffic none taken : anomaly accepted
Miss Distance	horizontal : 9000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Operational Deviation Intra Facility Coordination Failure

Narrative:

While working C90 sectors 2 and 3 combined (mdw southwest arrs and mdw south and west departures plus all west satellite arrs and departures), I had climbed air carrier X to 6000 ft in my departure corridor. The altitude used to tunnel the O'hare arrs from the southwest. As I was busy coordinating several mdw sbounds with the O'hare south departure controller, when I went back to check air carrier X's progress, I noticed another data block close to my aircraft. The O'hare west departure controller had let the air carrier Y slide into my airspace without coordination. I turned the air carrier X away from the air carrier Y. The air carrier X crew said they had air carrier Y insight. And applied visual separation. The aircraft came apart and continued on without further incident.

Original NASA ASRS Text

Title: DEP CTL ERRED WHEN 1 SECTOR CTLR ALLOWED DO-328 TO SLIDE INTO ANOTHER CTLR'S AIRSPACE WITHOUT COORD. THE RPTING, SECOND CTLR, TURNED HIS ACFT (B737) AWAY FROM THE INTRUDING DO-328.

Narrative: WHILE WORKING C90 SECTORS 2 AND 3 COMBINED (MDW SW ARRS AND MDW S AND W DEPS PLUS ALL W SATELLITE ARRS AND DEPS), I HAD CLBED ACR X TO 6000 FT IN MY DEP CORRIDOR. THE ALT USED TO TUNNEL THE O'HARE ARRS FROM THE SW. AS I WAS BUSY COORDINATING SEVERAL MDW SBOUNDS WITH THE O'HARE S DEP CTLR, WHEN I WENT BACK TO CHK ACR X'S PROGRESS, I NOTICED ANOTHER DATA BLOCK CLOSE TO MY ACFT. THE O'HARE W DEP CTLR HAD LET THE ACR Y SLIDE INTO MY AIRSPACE WITHOUT COORD. I TURNED THE ACR X AWAY FROM THE ACR Y. THE ACR X CREW SAID THEY HAD ACR Y INSIGHT. AND APPLIED VISUAL SEPARATION. THE ACFT CAME APART AND CONTINUED ON WITHOUT FURTHER INCIDENT.

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.