Attempting to provide service to an air carrier B737 due to in-flight WX, ZAU controller is unable to maintain standard separation between descending C550 and B737.

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Attributes
ACN	419746
Time
Date	199811
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : fwa
State Reference	IN
Altitude	msl bound lower : 18000 msl bound upper : 19000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Experience	controller radar : 2
ASRS Report	419746
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	other
Consequence	faa : investigated
Miss Distance	horizontal : 19200 vertical : 700
Supplementary
Air Traffic Incident	Operational Error

Narrative:

Aircraft X sebound at FL210 and aircraft Y nwbound at FL200. I descend aircraft X to FL190 and conflict alert went off. Aircraft Y asked for lower due to chop so I descended him to FL180 and turned him north. Aircraft Y didn't immediately turn and I turned him again and turned aircraft X west. They came to 3.2 mi and 700 ft.

Original NASA ASRS Text

Title: ATTEMPTING TO PROVIDE SVC TO AN ACR B737 DUE TO INFLT WX, ZAU CTLR IS UNABLE TO MAINTAIN STANDARD SEPARATION BTWN DSNDING C550 AND B737.

Narrative: ACFT X SEBOUND AT FL210 AND ACFT Y NWBOUND AT FL200. I DSND ACFT X TO FL190 AND CONFLICT ALERT WENT OFF. ACFT Y ASKED FOR LOWER DUE TO CHOP SO I DSNDED HIM TO FL180 AND TURNED HIM N. ACFT Y DIDN'T IMMEDIATELY TURN AND I TURNED HIM AGAIN AND TURNED ACFT X W. THEY CAME TO 3.2 MI AND 700 FT.

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.