ARTCC controller reporter issued a descent to cga X, a C550, to 11000 ft by mistake. The controller meant to issue a descent to 14000 ft. Traffic being worked by adjacent facility was climbing to 12000 ft. Less than standard separation resulted.

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Attributes
ACN	352324
Time
Date	199611
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : yog airport : dtw
State Reference	ON
Altitude	msl bound lower : 12000 msl bound upper : 12000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob tracon : dtw
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Flight Phase	descent other
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
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 9
ASRS Report	352324
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Cga X, a citation was given clearance to 14000 ft. He read back 11000 ft which it turns out was what I gave him. I missed the readback. I handed cga X off to the next sector (tol) who thought the aircraft was going to 14000 ft as indicated by the data block. He missed the aircraft checking on descending to 11000 ft. Dtw approach owns 13000 ft and below and cga X came in conflict with air carrier Y departing out of dtw airport at 12000 ft with 1.4 mi and 500 ft.

Original NASA ASRS Text

Title: ARTCC CTLR RPTR ISSUED A DSCNT TO CGA X, A C550, TO 11000 FT BY MISTAKE. THE CTLR MEANT TO ISSUE A DSCNT TO 14000 FT. TFC BEING WORKED BY ADJACENT FACILITY WAS CLBING TO 12000 FT. LTSS RESULTED.

Narrative: CGA X, A CITATION WAS GIVEN CLRNC TO 14000 FT. HE READ BACK 11000 FT WHICH IT TURNS OUT WAS WHAT I GAVE HIM. I MISSED THE READBACK. I HANDED CGA X OFF TO THE NEXT SECTOR (TOL) WHO THOUGHT THE ACFT WAS GOING TO 14000 FT AS INDICATED BY THE DATA BLOCK. HE MISSED THE ACFT CHKING ON DSNDING TO 11000 FT. DTW APCH OWNS 13000 FT AND BELOW AND CGA X CAME IN CONFLICT WITH ACR Y DEPARTING OUT OF DTW ARPT AT 12000 FT WITH 1.4 MI AND 500 FT.

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.