ZTL controller experienced operational error at FL200 when failing to recognized a developing loss of separation following an incorrect readback of assigned altitude.

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Attributes
ACN	808443
Time
Date	200810
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ztl.artcc
State Reference	GA
Altitude	msl bound lower : 20000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	general aviation : corporate
Make Model Name	Falcon 900
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : ztl.artcc
Operator	general aviation : personal
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller limited radar : 1 controller radar : 16 controller time certified in position1 : 7 controller time certified in position2 : 6
ASRS Report	808443
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Miss Distance	horizontal : 9240 vertical : 300
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

BE90; was sebound through my sector at FL210. F900; was departing an atl satellite airport headed wbound. I climbed 900 ft to FL200 and put in an interim data block of FL200. Aircraft read back climbing to FL230 and was missed. Didn't recognize the confliction until it was already occurring.

Original NASA ASRS Text

Title: ZTL CONTROLLER EXPERIENCED OPERATIONAL ERROR AT FL200 WHEN FAILING TO RECOGNIZED A DEVELOPING LOSS OF SEPARATION FOLLOWING AN INCORRECT READBACK OF ASSIGNED ALTITUDE.

Narrative: BE90; WAS SEBOUND THROUGH MY SECTOR AT FL210. F900; WAS DEPARTING AN ATL SATELLITE ARPT HEADED WBOUND. I CLBED 900 FT TO FL200 AND PUT IN AN INTERIM DATA BLOCK OF FL200. ACFT READ BACK CLBING TO FL230 AND WAS MISSED. DIDN'T RECOGNIZE THE CONFLICTION UNTIL IT WAS ALREADY OCCURRING.

Data retrieved from NASA's ASRS site as of May 2009 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.