ZOA controller experienced possible loss of standard separation with C550 and C441 at FL220.

Attributes
ACN	602409
Time
Date	200312
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : mva.vortac
State Reference	NV
Altitude	msl single value : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa.artcc
Operator	general aviation : personal
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude climbout : initial
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zoa.artcc
Operator	general aviation : personal
Make Model Name	Cessna Twin Turboprop Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 16
ASRS Report	602409
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 500
Supplementary
Problem Areas	Navigational Facility ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft Y descending to rno, aircraft X climbing mcn direct MVA, crossed approximately 4-5 NM 500-800 ft in vicinity of yerin intersection. Possible radar track jump to less than 5 NM lateral separation.

Original NASA ASRS Text

Title: ZOA CTLR EXPERIENCED POSSIBLE LOSS OF STANDARD SEPARATION WITH C550 AND C441 AT FL220.

Narrative: ACFT Y DSNDING TO RNO, ACFT X CLBING MCN DIRECT MVA, CROSSED APPROX 4-5 NM 500-800 FT IN VICINITY OF YERIN INTXN. POSSIBLE RADAR TRACK JUMP TO LESS THAN 5 NM LATERAL 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.