Aircraft was descended to an altitude occupied by another aircraft.

Attributes
ACN	107677
Time
Date	198903
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : rzc
State Reference	AR
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	107677
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 18000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Inter Facility Coordination Failure Operational Error

Narrative:

I was working the D2 position at the ZME ARTCC. I was very busy with numerous aircraft inbound to the fayetteville, ar, terminal area. I coordinated an light transport inbound to springdale, ar, with fayetteville approach control descending to 6000'. I coordinated small transport inbound to rogers, ar, descending to 7000'. Small transport arrived early and was switched by the radar controller to fayetteville approach. Light transport was still at 12000' and obviously second, about 30 mi north of razorback at this time. I called fayetteville approach and requested them to descend small transport to 6000' and I would descend light transport to 7000'. Due to other traffic within and under the control of fayetteville approach, fayetteville did not immediately descend small transport to 6000'. As I was not aware of this I descended light transport to 7000' with loss of minimum sep.

Original NASA ASRS Text

Title: ACFT WAS DESCENDED TO AN ALT OCCUPIED BY ANOTHER ACFT.

Narrative: I WAS WORKING THE D2 POS AT THE ZME ARTCC. I WAS VERY BUSY WITH NUMEROUS ACFT INBND TO THE FAYETTEVILLE, AR, TERMINAL AREA. I COORDINATED AN LTT INBND TO SPRINGDALE, AR, WITH FAYETTEVILLE APCH CTL DSNDING TO 6000'. I COORDINATED SMT INBND TO ROGERS, AR, DSNDING TO 7000'. SMT ARRIVED EARLY AND WAS SWITCHED BY THE RADAR CTLR TO FAYETTEVILLE APCH. LTT WAS STILL AT 12000' AND OBVIOUSLY SECOND, ABOUT 30 MI N OF RAZORBACK AT THIS TIME. I CALLED FAYETTEVILLE APCH AND REQUESTED THEM TO DSND SMT TO 6000' AND I WOULD DSND LTT TO 7000'. DUE TO OTHER TFC WITHIN AND UNDER THE CTL OF FAYETTEVILLE APCH, FAYETTEVILLE DID NOT IMMEDIATELY DSND SMT TO 6000'. AS I WAS NOT AWARE OF THIS I DSNDED LTT TO 7000' WITH LOSS OF MINIMUM SEP.

Data retrieved from NASA's ASRS site as of August 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.