Approach controller turned two aircraft to maintain separation, but was too late and less than standard separation occurred.

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Attributes
ACN	167718
Time
Date	199101
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ric
State Reference	VA
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lax
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Route In Use	enroute airway : ric
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 11
ASRS Report	167718
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 14000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While I was working radar position I noticed a potential conflict about to occur between 2 aircraft at the same altitude. I immediately turned both aircraft and issued traffic. The small transport X reported the other aircraft Y in sight at which time I told him to maintain visibility sep.

Original NASA ASRS Text

Title: APCH CTLR TURNED TWO ACFT TO MAINTAIN SEPARATION, BUT WAS TOO LATE AND LESS THAN STANDARD SEPARATION OCCURRED.

Narrative: WHILE I WAS WORKING RADAR POS I NOTICED A POTENTIAL CONFLICT ABOUT TO OCCUR BTWN 2 ACFT AT THE SAME ALT. I IMMEDIATELY TURNED BOTH ACFT AND ISSUED TFC. THE SMT X RPTED THE OTHER ACFT Y IN SIGHT AT WHICH TIME I TOLD HIM TO MAINTAIN VIS SEP.

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.