ZOB controller experienced operational error during busy traffic at 14000 ft.

Attributes
ACN	610107
Time
Date	200403
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : mfd.vortac
State Reference	OH
Altitude	msl single value : 14000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc tower : mmun.tower
Operator	common carrier : air taxi
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	climbout : vacating altitude climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller limited radar : 3 controller military : 7 controller radar : 9 controller time certified in position2 : 2
ASRS Report	610107
Person 2
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 24600 vertical : 200
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

At the time of the incident, I was working mfd radar with 19 aircraft, which was a complex mix of overflts, departures and arrs. The B190 was climbing over mfd to an altitude of 14000 ft. I thought that the E145 was climbing over ape and I assigned the aircraft FL230. I was then coordinating with other sectors and issuing clrncs to other aircraft when the conflict alert went off. I turned the E145 15 degree left and the B190 15 degrees right, bvt the loss of separation had already occurred.

Original NASA ASRS Text

Title: ZOB CTLR EXPERIENCED OPERROR DURING BUSY TFC AT 14000 FT.

Narrative: AT THE TIME OF THE INCIDENT, I WAS WORKING MFD RADAR WITH 19 ACFT, WHICH WAS A COMPLEX MIX OF OVERFLTS, DEPS AND ARRS. THE B190 WAS CLBING OVER MFD TO AN ALT OF 14000 FT. I THOUGHT THAT THE E145 WAS CLBING OVER APE AND I ASSIGNED THE ACFT FL230. I WAS THEN COORDINATING WITH OTHER SECTORS AND ISSUING CLRNCS TO OTHER ACFT WHEN THE CONFLICT ALERT WENT OFF. I TURNED THE E145 15 DEG L AND THE B190 15 DEGS R, BVT THE LOSS OF SEPARATION HAD ALREADY OCCURRED.

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.