ZMP controller experienced operational error at approximately FL380 with slow climbing C550 and A320...

Attributes
ACN	622069
Time
Date	200406
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : rwf.vor
State Reference	MN
Altitude	msl bound lower : 36500 msl bound upper : 38100
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zmp.artcc
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change descent : vacating altitude descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zmp.artcc
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 9 controller radar : 33 controller supervisory : 7 controller time certified in position1 : 3 controller time certified in position2 : 2
ASRS Report	622069
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 19800 vertical : 1600
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Slow climbing citation to FL390 stopped climb and actually started to descend to gain speed. The citation never advised the controller of the stopped/level climb, resulting in loss of separation with air carrier aircraft.

Original NASA ASRS Text

Title: ZMP CTLR EXPERIENCED OPERROR AT APPROX FL380 WITH SLOW CLBING C550 AND A320.

Narrative: SLOW CLBING CITATION TO FL390 STOPPED CLB AND ACTUALLY STARTED TO DSND TO GAIN SPD. THE CITATION NEVER ADVISED THE CTLR OF THE STOPPED/LEVEL CLB, RESULTING IN LOSS OF SEPARATION WITH ACR ACFT.

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.