Less than standard separation occurred between 2 aircraft under the control of ATC.

Attributes
ACN	146361
Time
Date	199005
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sle
State Reference	OR
Altitude	msl bound lower : 14000 msl bound upper : 14000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zse
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 4 controller radar : 2
ASRS Report	146361
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : developmental
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Radar controller trnee had been on sector for about 2 hours of fairly complex traffic. Just as he was being relieved, he cleared a light transport X through the altitude of a nearly head-on light transport Y. Aircraft were too close to make descent west/O losing sep. Error was detected too late to correct. C/a never flashed.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION OCCURRED BETWEEN 2 ACFT UNDER THE CTL OF ATC.

Narrative: RADAR CTLR TRNEE HAD BEEN ON SECTOR FOR ABOUT 2 HRS OF FAIRLY COMPLEX TFC. JUST AS HE WAS BEING RELIEVED, HE CLRED A LTT X THROUGH THE ALT OF A NEARLY HEAD-ON LTT Y. ACFT WERE TOO CLOSE TO MAKE DSNT W/O LOSING SEP. ERROR WAS DETECTED TOO LATE TO CORRECT. C/A NEVER FLASHED.

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.