Light transport X had less than standard separation from aircraft Y. System error.

Attributes
ACN	204348
Time
Date	199203
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : okc
State Reference	OK
Altitude	msl bound lower : 17800 msl bound upper : 17800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw tower : bos
Operator	general aviation : personal
Make Model Name	Light Transport, High Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 22
ASRS Report	204348
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 22200 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I accepted handoffs on 2 aircraft that I believed to be diverging that were in fact converging and overtaking. I climbed both aircraft after proper coordination. My attention was diverted briefly to another traffic situation. When I returned to the 2 departures, the error had already occurred. I attempted to establish vertical separation, but it was too late. Light transport X 410 departure okc requesting 370 okc IRW121040 3001/09010 msy eyw. Aircraft Y 330 departed pwa requesting 250 pwa IRW121045 shv.

Original NASA ASRS Text

Title: LTT X HAD LTSS FROM ACFT Y. SYS ERROR.

Narrative: I ACCEPTED HDOFS ON 2 ACFT THAT I BELIEVED TO BE DIVERGING THAT WERE IN FACT CONVERGING AND OVERTAKING. I CLBED BOTH ACFT AFTER PROPER COORD. MY ATTN WAS DIVERTED BRIEFLY TO ANOTHER TFC SITUATION. WHEN I RETURNED TO THE 2 DEPS, THE ERROR HAD ALREADY OCCURRED. I ATTEMPTED TO ESTABLISH VERT SEPARATION, BUT IT WAS TOO LATE. LTT X 410 DEP OKC REQUESTING 370 OKC IRW121040 3001/09010 MSY EYW. ACFT Y 330 DEPARTED PWA REQUESTING 250 PWA IRW121045 SHV.

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.