ZOB radar controller lost separation between converging traffic wbound and northbound.

Attributes
ACN	487899
Time
Date	200010
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : flm.vor
State Reference	KY
Altitude	msl single value : 22000
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	general aviation : personal
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.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
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar instruction : trainee
Qualification	controller : radar
Experience	controller non radar : 3 controller radar : 7
ASRS Report	487899
Person 2
Affiliation	government : faa
Function	controller : radar instruction : instructor
Qualification	controller : radar
Events
Anomaly	conflict : airborne critical non adherence : published procedure
Independent Detector	atc equipment : conflict alert other controllera other controllerb other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance none taken : insufficient time
Miss Distance	horizontal : 27600 vertical : 400
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X wbound at FL220. Air carrier Y northbound at FL230. Air carrier Y issued 020 degree heading and descent to FL180. Air carrier Y was later assigned 040 degree heading and climb back to FL230. Oedf notified 4.6 mi and 400 ft vertical. Ntap, inconclusive.

Original NASA ASRS Text

Title: ZOB RADAR CTLR LOST SEPARATION BTWN CONVERGING TFC WBOUND AND NBOUND.

Narrative: ACFT X WBOUND AT FL220. ACR Y NBOUND AT FL230. ACR Y ISSUED 020 DEG HDG AND DSCNT TO FL180. ACR Y WAS LATER ASSIGNED 040 DEG HDG AND CLB BACK TO FL230. OEDF NOTIFIED 4.6 MI AND 400 FT VERT. NTAP, INCONCLUSIVE.

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.