Air carrier X had less than standard separation from atx Y. System error.

Attributes
ACN	163774
Time
Date	199011
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : omn
State Reference	FL
Altitude	msl bound lower : 21000 msl bound upper : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx tower : dtw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Medium Transport
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 19
ASRS Report	163774
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 other
Consequence	faa : investigated
Miss Distance	horizontal : 15000 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was working D57/D58 while mco was below minimums. R58 was split off and I slid over and worked R57. R58 was holding and the supervisor and the controller was bickering on how to control the sector. I had there inbound to jax at this time with two departures off of dab with a slow one off first and a jet off second both should be, by letter of agreement vectored under my jax arrs. The dab departure I have to coordination with R58 which the controller at this time is relieved by the supervisor because of the disagreement. I descended air carrier X to which I thought to FL220 on top of atx Y at FL210. Air carrier X left FL218 and I questioned the jet and climb him back to FL220.

Original NASA ASRS Text

Title: ACR X HAD LESS THAN STANDARD SEPARATION FROM ATX Y. SYSTEM ERROR.

Narrative: I WAS WORKING D57/D58 WHILE MCO WAS BELOW MINIMUMS. R58 WAS SPLIT OFF AND I SLID OVER AND WORKED R57. R58 WAS HOLDING AND THE SUPVR AND THE CTLR WAS BICKERING ON HOW TO CTL THE SECTOR. I HAD THERE INBND TO JAX AT THIS TIME WITH TWO DEPS OFF OF DAB WITH A SLOW ONE OFF FIRST AND A JET OFF SEC BOTH SHOULD BE, BY LETTER OF AGREEMENT VECTORED UNDER MY JAX ARRS. THE DAB DEP I HAVE TO COORD WITH R58 WHICH THE CTLR AT THIS TIME IS RELIEVED BY THE SUPVR BECAUSE OF THE DISAGREEMENT. I DSNDED ACR X TO WHICH I THOUGHT TO FL220 ON TOP OF ATX Y AT FL210. ACR X LEFT FL218 AND I QUESTIONED THE JET AND CLB HIM BACK TO FL220.

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.