Less than standard separation occurred between a departing aircraft and an arriving aircraft.

Attributes
ACN	146585
Time
Date	199005
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fwh
State Reference	TX
Altitude	msl bound lower : 10300 msl bound upper : 11000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller radar : 8
ASRS Report	146585
Person 2
Affiliation	company : air carrier
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
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Working DR2 and DR3 (southbound and westbound department). Heavy thunderstorm activity and major traffic deviations arrival and departures). I issued 10000' as an altitude for a westbound large transport in order to miss an arrival well west of the STAR at 11000'. When they were clear I issued climb to 17000' to the departure. I was then called for a WX deviation by a southbound departure. I then saw another arrival at 11000' deviating from the STAR converging on the westbound departure who was climbing out of 10300'. I immediately issued 10000' again to the westbound departure, but wound up with less than standard separation. I'm not trying to be evasive when I say I really do not know what the cause of this error is. I was not complacent or inattentive to detail as I was newly checked out and the complexity of the job was greater than normal. All I know for certain (west/O removing the responsibility to know from myself) is that for whatever reason, I was not completely aware that the arrival would be where it was at that time.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION OCCURRED BETWEEN A DEPARTING ACFT AND AN ARRIVING ACFT.

Narrative: WORKING DR2 AND DR3 (SBND AND WBND DEPT). HEAVY TSTM ACTIVITY AND MAJOR TFC DEVIATIONS ARR AND DEPS). I ISSUED 10000' AS AN ALT FOR A WBND LGT IN ORDER TO MISS AN ARR WELL W OF THE STAR AT 11000'. WHEN THEY WERE CLR I ISSUED CLB TO 17000' TO THE DEP. I WAS THEN CALLED FOR A WX DEVIATION BY A SBND DEP. I THEN SAW ANOTHER ARR AT 11000' DEVIATING FROM THE STAR CONVERGING ON THE WBND DEP WHO WAS CLBING OUT OF 10300'. I IMMEDIATELY ISSUED 10000' AGAIN TO THE WBND DEP, BUT WOUND UP WITH LTSS. I'M NOT TRYING TO BE EVASIVE WHEN I SAY I REALLY DO NOT KNOW WHAT THE CAUSE OF THIS ERROR IS. I WAS NOT COMPLACENT OR INATTENTIVE TO DETAIL AS I WAS NEWLY CHKED OUT AND THE COMPLEXITY OF THE JOB WAS GREATER THAN NORMAL. ALL I KNOW FOR CERTAIN (W/O REMOVING THE RESPONSIBILITY TO KNOW FROM MYSELF) IS THAT FOR WHATEVER REASON, I WAS NOT COMPLETELY AWARE THAT THE ARR WOULD BE WHERE IT WAS AT THAT TIME.

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.