ZDC controller experienced operational error at FL190 with descending and cruise aircraft.

Attributes
ACN	628704
Time
Date	200408
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : ccv.vortac
State Reference	VA
Altitude	msl single value : 19000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc tower : hpn.tower
Operator	general aviation : personal
Make Model Name	Citation I/SP
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdc.artcc
Operator	general aviation : personal
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 21
ASRS Report	628704
Person 2
Affiliation	other
Function	flight crew : single pilot oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued alert
Consequence	faa : investigated
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft Y checked on at 16000 ft requesting higher. I climbed him to FL200. After several mins, he was still below FL180 so I gave him 10 mi north of ccv at 10000 ft. He continued his climb to FL200. Aircraft Y was a departure northbound at FL190. Aircraft X was slow and I had several aircraft I was trying to vector around him and descend into orf and still miss the aircraft Y. I overlooked aircraft Y with aircraft X and aircraft X started his descent as soon as he passed aircraft Y and caused the loss of separation.

Original NASA ASRS Text

Title: ZDC CTLR EXPERIENCED OPERROR AT FL190 WITH DSNDING AND CRUISE ACFT.

Narrative: ACFT Y CHKED ON AT 16000 FT REQUESTING HIGHER. I CLBED HIM TO FL200. AFTER SEVERAL MINS, HE WAS STILL BELOW FL180 SO I GAVE HIM 10 MI N OF CCV AT 10000 FT. HE CONTINUED HIS CLB TO FL200. ACFT Y WAS A DEP NBOUND AT FL190. ACFT X WAS SLOW AND I HAD SEVERAL ACFT I WAS TRYING TO VECTOR AROUND HIM AND DSND INTO ORF AND STILL MISS THE ACFT Y. I OVERLOOKED ACFT Y WITH ACFT X AND ACFT X STARTED HIS DSCNT AS SOON AS HE PASSED ACFT Y AND CAUSED THE LOSS OF SEPARATION.

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.