ARTCC radar controller descended small transport through altitude of company small transport with less than standard separation. Conflict alert activated.

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Attributes
ACN	180141
Time
Date	199106
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ocf
State Reference	FL
Altitude	msl bound lower : 13000 msl bound upper : 13100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other
Route In Use	enroute : on vectors enroute airway : zjx
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 6
ASRS Report	180141
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 23400 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was the radar specialist working small transport X at 14000 and small transport Y at 13000. I also had 4 or 5 additional aircraft on the scope. I descended small transport X to cross gnv VORTAC at 12000 and continued to perform other duties. Small transport X reported out of 14000 and the conflict alert feature started flashing about 55 seconds later. I immediately turned both aircraft to 270 heading and 090 degree heading and lost separation. I believe this error was caused by human error that will never be completely eliminated. The conflict alert feature, in this case, was very helpful.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR DSNDED SMT THROUGH ALT OF COMPANY SMT WITH LTSS. CONFLICT ALERT ACTIVATED.

Narrative: I WAS THE RADAR SPECIALIST WORKING SMT X AT 14000 AND SMT Y AT 13000. I ALSO HAD 4 OR 5 ADDITIONAL ACFT ON THE SCOPE. I DSNDED SMT X TO CROSS GNV VORTAC AT 12000 AND CONTINUED TO PERFORM OTHER DUTIES. SMT X RPTED OUT OF 14000 AND THE CONFLICT ALERT FEATURE STARTED FLASHING ABOUT 55 SECONDS LATER. I IMMEDIATELY TURNED BOTH ACFT TO 270 HDG AND 090 DEG HDG AND LOST SEPARATION. I BELIEVE THIS ERROR WAS CAUSED BY HUMAN ERROR THAT WILL NEVER BE COMPLETELY ELIMINATED. THE CONFLICT ALERT FEATURE, IN THIS CASE, WAS VERY HELPFUL.

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.