Approach controller was distraction by other traffic and did not see the potential conflict between the SW3 and the C340 in time to prevent the loss of standard separation. Both aircraft were given turns and TA's and the SW3 did see the C340 but not before the separation was lost.

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Attributes
ACN	368281
Time
Date	199705
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : atlg airport : atl
State Reference	GA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl tower : dfw
Operator	general aviation : corporate
Make Model Name	Merlin III
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Cessna 340/340A
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar pilot : private
Experience	controller radar : 6 flight time total : 140
ASRS Report	368281
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 10000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #1 was on a 180 degree heading. Aircraft #2 was on a 030 degree heading. I had been distraction by other traffic and noticed the conflict. I immediately turned aircraft #1 left to heading 150 degrees and turned aircraft #2 left to heading 330 degrees. Aircraft #1 reported aircraft #2 in sight but not until standard separation had been lost. Closest proximity was approximately 2 mi horizontal and 0 ft vertical.

Original NASA ASRS Text

Title: APCH CTLR WAS DISTR BY OTHER TFC AND DID NOT SEE THE POTENTIAL CONFLICT BTWN THE SW3 AND THE C340 IN TIME TO PREVENT THE LOSS OF STANDARD SEPARATION. BOTH ACFT WERE GIVEN TURNS AND TA'S AND THE SW3 DID SEE THE C340 BUT NOT BEFORE THE SEPARATION WAS LOST.

Narrative: ACFT #1 WAS ON A 180 DEG HDG. ACFT #2 WAS ON A 030 DEG HDG. I HAD BEEN DISTR BY OTHER TFC AND NOTICED THE CONFLICT. I IMMEDIATELY TURNED ACFT #1 L TO HDG 150 DEGS AND TURNED ACFT #2 L TO HDG 330 DEGS. ACFT #1 RPTED ACFT #2 IN SIGHT BUT NOT UNTIL STANDARD SEPARATION HAD BEEN LOST. CLOSEST PROX WAS APPROX 2 MI HORIZ AND 0 FT VERT.

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.