ZID controller experienced loss of separation with 2 aircraft at FL280.

Attributes
ACN	604955
Time
Date	200401
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : bkw.vortac
State Reference	WV
Altitude	msl bound lower : 28000 msl bound upper : 28600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc artcc : zid.artcc tower : int.tower
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	cruise : enroute altitude change cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar controller : military
Experience	controller military : 13 controller radar : 18 controller supervisory : 5
ASRS Report	604955
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 23400 vertical : 100
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Inter Facility Coordination Failure Operational Error

Narrative:

Aircraft X was descended to FL280 and was sbound. Aircraft Y was at FL290 northbound. Aircraft X was switched to ZTL. Aircraft Y was descended to FL270 for traffic eastbound at FL290. I stopped the descent at FL286 and told him to climb.

Original NASA ASRS Text

Title: ZID CTLR EXPERIENCED LOSS OF SEPARATION WITH 2 ACFT AT FL280.

Narrative: ACFT X WAS DSNDED TO FL280 AND WAS SBOUND. ACFT Y WAS AT FL290 NBOUND. ACFT X WAS SWITCHED TO ZTL. ACFT Y WAS DSNDED TO FL270 FOR TFC EBOUND AT FL290. I STOPPED THE DSCNT AT FL286 AND TOLD HIM TO CLB.

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.