Less than standard separation between corp aircraft and commuter. Operational error.

Attributes
ACN	101967
Time
Date	198901
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : smf
State Reference	CA
Altitude	msl bound lower : 1800 msl bound upper : 1900
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mcc artcc : zdc
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other descent : approach other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other descent : approach other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach controller : departure
Qualification	controller : radar
ASRS Report	101967
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : exited penetrated airspace none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 6000 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was assigned the west radar sector and I was also providing OJT to a developmental controller. We had accepted a non ARTS track handoff on corp X from ZOA sector 42. Position was confirmed according to handbook procedures. Corp X was then vectored to the ILS 16R localizer. X was turned downwind ahead of commuter Y, but because of the slow turn radius and other traffic conditions I did not observe that Y was overtaking X. A traffic alert was issued and Y was turned right to 070 degrees for sep. Y sighted the traffic and was instructed to maintain visibility sep. At the time there were approximately 8-10 aircraft on frequency.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION BETWEEN CORP ACFT AND COMMUTER. OPERATIONAL ERROR.

Narrative: I WAS ASSIGNED THE W RADAR SECTOR AND I WAS ALSO PROVIDING OJT TO A DEVELOPMENTAL CTLR. WE HAD ACCEPTED A NON ARTS TRACK HDOF ON CORP X FROM ZOA SECTOR 42. POS WAS CONFIRMED ACCORDING TO HANDBOOK PROCS. CORP X WAS THEN VECTORED TO THE ILS 16R LOC. X WAS TURNED DOWNWIND AHEAD OF COMMUTER Y, BUT BECAUSE OF THE SLOW TURN RADIUS AND OTHER TFC CONDITIONS I DID NOT OBSERVE THAT Y WAS OVERTAKING X. A TFC ALERT WAS ISSUED AND Y WAS TURNED RIGHT TO 070 DEGS FOR SEP. Y SIGHTED THE TFC AND WAS INSTRUCTED TO MAINTAIN VIS SEP. AT THE TIME THERE WERE APPROX 8-10 ACFT ON FREQ.

Data retrieved from NASA's ASRS site as of August 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.