ARTCC radar controller issued a clearance for an aircraft to climb to FL310 which resulted in less than standard separation from another aircraft at FL310.

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Attributes
ACN	149984
Time
Date	199006
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : jnc
State Reference	CO
Altitude	msl bound lower : 29700 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 3 controller non radar : 8 controller radar : 5
ASRS Report	149984
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	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 22800 vertical : 1300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I issued a clearance to an small transport to FL310. There was an medium large transport already at FL310. I observed the conflict between the aircraft and issued a clearance to the small transport to maintain FL290 when the mode C showed FL288. The small transport went above FL290 and said he was sorry and that he went through FL290 and was going back down. At the time of this situation, I was taking restrictive medication that the medical department and management knew about. The medication might have played a part.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR ISSUED A CLRNC FOR AN ACFT TO CLIMB TO FL310 WHICH RESULTED IN LESS THAN STANDARD SEPARATION FROM ANOTHER ACFT AT FL310.

Narrative: I ISSUED A CLRNC TO AN SMT TO FL310. THERE WAS AN MLG ALREADY AT FL310. I OBSERVED THE CONFLICT BTWN THE ACFT AND ISSUED A CLRNC TO THE SMT TO MAINTAIN FL290 WHEN THE MODE C SHOWED FL288. THE SMT WENT ABOVE FL290 AND SAID HE WAS SORRY AND THAT HE WENT THROUGH FL290 AND WAS GOING BACK DOWN. AT THE TIME OF THIS SITUATION, I WAS TAKING RESTRICTIVE MEDICATION THAT THE MEDICAL DEPT AND MGMNT KNEW ABOUT. THE MEDICATION MIGHT HAVE PLAYED A PART.

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.