ZAU controller does not ensure separation between climbing MD80 and en route DC9.

Attributes
ACN	520314
Time
Date	200108
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zau.artcc
State Reference	IL
Altitude	msl bound lower : 31000 msl bound upper : 35000
Environment
Weather Elements	other
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Experience	controller radar : 15
ASRS Report	520314
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 21000 vertical : 1200
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Aircraft
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X called on climbing to FL310, requesting FL350. His routing was swbound from mzv to irk and continuing southwest. I had previously taken a pointout on aircraft Y nebound. I climbed aircraft X and asked that he be level in 2 1/2 mins. He said he would comply and began climbing. It appeared to be no problem until he reached FL340, where he slowed down his climb dramatically. I turned the aircraft X but too late to effect separation.

Original NASA ASRS Text

Title: ZAU CTLR DOES NOT ENSURE SEPARATION BTWN CLBING MD80 AND ENRTE DC9.

Narrative: ACFT X CALLED ON CLBING TO FL310, REQUESTING FL350. HIS ROUTING WAS SWBOUND FROM MZV TO IRK AND CONTINUING SW. I HAD PREVIOUSLY TAKEN A POINTOUT ON ACFT Y NEBOUND. I CLBED ACFT X AND ASKED THAT HE BE LEVEL IN 2 1/2 MINS. HE SAID HE WOULD COMPLY AND BEGAN CLBING. IT APPEARED TO BE NO PROB UNTIL HE REACHED FL340, WHERE HE SLOWED DOWN HIS CLB DRAMATICALLY. I TURNED THE ACFT X BUT TOO LATE TO EFFECT SEPARATION.

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.